/* jobs.c - functions that make children, remember them, and handle their termination. */
/* This file works with both POSIX and BSD systems. It implements job
control. */
/* Copyright (C) 1989-2010 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see .
*/
#include "config.h"
#include "bashtypes.h"
#include "trap.h"
#include
#include
#include
#if defined (HAVE_UNISTD_H)
# include
#endif
#include "posixtime.h"
#if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) && !defined (RLIMTYPE)
# include
#endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 && !RLIMTYPE */
#if defined (HAVE_SYS_FILE_H)
# include
#endif
#include "filecntl.h"
#include
#include
#if defined (BUFFERED_INPUT)
# include "input.h"
#endif
/* Need to include this up here for *_TTY_DRIVER definitions. */
#include "shtty.h"
/* Define this if your output is getting swallowed. It's a no-op on
machines with the termio or termios tty drivers. */
/* #define DRAIN_OUTPUT */
/* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */
#if defined (hpux) && !defined (TERMIOS_TTY_DRIVER)
# include
#endif /* hpux && !TERMIOS_TTY_DRIVER */
#include "bashansi.h"
#include "bashintl.h"
#include "shell.h"
#include "jobs.h"
#include "execute_cmd.h"
#include "flags.h"
#include "builtins/builtext.h"
#include "builtins/common.h"
#if !defined (errno)
extern int errno;
#endif /* !errno */
#if !defined (HAVE_KILLPG)
extern int killpg __P((pid_t, int));
#endif
#define DEFAULT_CHILD_MAX 32
#if !defined (DEBUG)
#define MAX_JOBS_IN_ARRAY 4096 /* production */
#else
#define MAX_JOBS_IN_ARRAY 128 /* testing */
#endif
/* Flag values for second argument to delete_job */
#define DEL_WARNSTOPPED 1 /* warn about deleting stopped jobs */
#define DEL_NOBGPID 2 /* don't add pgrp leader to bgpids */
/* Take care of system dependencies that must be handled when waiting for
children. The arguments to the WAITPID macro match those to the Posix.1
waitpid() function. */
#if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION)
# define WAITPID(pid, statusp, options) \
wait3 ((union wait *)statusp, options, (struct rusage *)0)
#else
# if defined (_POSIX_VERSION) || defined (HAVE_WAITPID)
# define WAITPID(pid, statusp, options) \
waitpid ((pid_t)pid, statusp, options)
# else
# if defined (HAVE_WAIT3)
# define WAITPID(pid, statusp, options) \
wait3 (statusp, options, (struct rusage *)0)
# else
# define WAITPID(pid, statusp, options) \
wait3 (statusp, options, (int *)0)
# endif /* HAVE_WAIT3 */
# endif /* !_POSIX_VERSION && !HAVE_WAITPID*/
#endif /* !(Ultrix && mips && _POSIX_VERSION) */
/* getpgrp () varies between systems. Even systems that claim to be
Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */
#if defined (GETPGRP_VOID)
# define getpgid(p) getpgrp ()
#else
# define getpgid(p) getpgrp (p)
#endif /* !GETPGRP_VOID */
/* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the
handler for SIGCHLD. */
#if defined (MUST_REINSTALL_SIGHANDLERS)
# define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler)
#else
# define REINSTALL_SIGCHLD_HANDLER
#endif /* !MUST_REINSTALL_SIGHANDLERS */
/* Some systems let waitpid(2) tell callers about stopped children. */
#if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN)
# undef WCONTINUED
# define WCONTINUED 0
#endif
#if !defined (WIFCONTINUED)
# define WIFCONTINUED(s) (0)
#endif
/* The number of additional slots to allocate when we run out. */
#define JOB_SLOTS 8
typedef int sh_job_map_func_t __P((JOB *, int, int, int));
/* Variables used here but defined in other files. */
extern int subshell_environment, line_number;
extern int posixly_correct, shell_level;
extern int last_command_exit_value, last_command_exit_signal;
extern int loop_level, breaking;
extern int executing_list;
extern int sourcelevel;
extern int running_trap;
extern sh_builtin_func_t *this_shell_builtin;
extern char *shell_name, *this_command_name;
extern sigset_t top_level_mask;
extern procenv_t wait_intr_buf;
extern int wait_signal_received;
extern WORD_LIST *subst_assign_varlist;
static struct jobstats zerojs = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
struct jobstats js = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
struct bgpids bgpids = { 0, 0, 0 };
/* The array of known jobs. */
JOB **jobs = (JOB **)NULL;
#if 0
/* The number of slots currently allocated to JOBS. */
int job_slots = 0;
#endif
/* The controlling tty for this shell. */
int shell_tty = -1;
/* The shell's process group. */
pid_t shell_pgrp = NO_PID;
/* The terminal's process group. */
pid_t terminal_pgrp = NO_PID;
/* The process group of the shell's parent. */
pid_t original_pgrp = NO_PID;
/* The process group of the pipeline currently being made. */
pid_t pipeline_pgrp = (pid_t)0;
#if defined (PGRP_PIPE)
/* Pipes which each shell uses to communicate with the process group leader
until all of the processes in a pipeline have been started. Then the
process leader is allowed to continue. */
int pgrp_pipe[2] = { -1, -1 };
#endif
#if 0
/* The job which is current; i.e. the one that `%+' stands for. */
int current_job = NO_JOB;
/* The previous job; i.e. the one that `%-' stands for. */
int previous_job = NO_JOB;
#endif
/* Last child made by the shell. */
pid_t last_made_pid = NO_PID;
/* Pid of the last asynchronous child. */
pid_t last_asynchronous_pid = NO_PID;
/* The pipeline currently being built. */
PROCESS *the_pipeline = (PROCESS *)NULL;
/* If this is non-zero, do job control. */
int job_control = 1;
/* Call this when you start making children. */
int already_making_children = 0;
/* If this is non-zero, $LINES and $COLUMNS are reset after every process
exits from get_tty_state(). */
int check_window_size;
/* Functions local to this file. */
static sighandler wait_sigint_handler __P((int));
static sighandler sigchld_handler __P((int));
static sighandler sigcont_sighandler __P((int));
static sighandler sigstop_sighandler __P((int));
static int waitchld __P((pid_t, int));
static PROCESS *find_pipeline __P((pid_t, int, int *));
static PROCESS *find_process __P((pid_t, int, int *));
static char *current_working_directory __P((void));
static char *job_working_directory __P((void));
static char *j_strsignal __P((int));
static char *printable_job_status __P((int, PROCESS *, int));
static PROCESS *find_last_proc __P((int, int));
static pid_t find_last_pid __P((int, int));
static int set_new_line_discipline __P((int));
static int map_over_jobs __P((sh_job_map_func_t *, int, int));
static int job_last_stopped __P((int));
static int job_last_running __P((int));
static int most_recent_job_in_state __P((int, JOB_STATE));
static int find_job __P((pid_t, int, PROCESS **));
static int print_job __P((JOB *, int, int, int));
static int process_exit_status __P((WAIT));
static int process_exit_signal __P((WAIT));
static int set_job_status_and_cleanup __P((int));
static WAIT job_signal_status __P((int));
static WAIT raw_job_exit_status __P((int));
static void notify_of_job_status __P((void));
static void reset_job_indices __P((void));
static void cleanup_dead_jobs __P((void));
static int processes_in_job __P((int));
static void realloc_jobs_list __P((void));
static int compact_jobs_list __P((int));
static int discard_pipeline __P((PROCESS *));
static void add_process __P((char *, pid_t));
static void print_pipeline __P((PROCESS *, int, int, FILE *));
static void pretty_print_job __P((int, int, FILE *));
static void set_current_job __P((int));
static void reset_current __P((void));
static void set_job_running __P((int));
static void setjstatus __P((int));
static int maybe_give_terminal_to __P((pid_t, pid_t, int));
static void mark_all_jobs_as_dead __P((void));
static void mark_dead_jobs_as_notified __P((int));
static void restore_sigint_handler __P((void));
#if defined (PGRP_PIPE)
static void pipe_read __P((int *));
#endif
static struct pidstat *bgp_alloc __P((pid_t, int));
static struct pidstat *bgp_add __P((pid_t, int));
static int bgp_delete __P((pid_t));
static void bgp_clear __P((void));
static int bgp_search __P((pid_t));
static void bgp_prune __P((void));
#if defined (ARRAY_VARS)
static int *pstatuses; /* list of pipeline statuses */
static int statsize;
#endif
/* Used to synchronize between wait_for and other functions and the SIGCHLD
signal handler. */
static int sigchld;
static int queue_sigchld;
#define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++
#define UNQUEUE_SIGCHLD(os) \
do { \
queue_sigchld--; \
if (queue_sigchld == 0 && os != sigchld) \
waitchld (-1, 0); \
} while (0)
static SigHandler *old_tstp, *old_ttou, *old_ttin;
static SigHandler *old_cont = (SigHandler *)SIG_DFL;
/* A place to temporarily save the current pipeline. */
static PROCESS *saved_pipeline;
static int saved_already_making_children;
/* Set this to non-zero whenever you don't want the jobs list to change at
all: no jobs deleted and no status change notifications. This is used,
for example, when executing SIGCHLD traps, which may run arbitrary
commands. */
static int jobs_list_frozen;
static char retcode_name_buffer[64];
/* flags to detect pid wraparound */
static pid_t first_pid = NO_PID;
static int pid_wrap = -1;
#if !defined (_POSIX_VERSION)
/* These are definitions to map POSIX 1003.1 functions onto existing BSD
library functions and system calls. */
#define setpgid(pid, pgrp) setpgrp (pid, pgrp)
#define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp))
pid_t
tcgetpgrp (fd)
int fd;
{
pid_t pgrp;
/* ioctl will handle setting errno correctly. */
if (ioctl (fd, TIOCGPGRP, &pgrp) < 0)
return (-1);
return (pgrp);
}
#endif /* !_POSIX_VERSION */
/* Initialize the global job stats structure and other bookkeeping variables */
void
init_job_stats ()
{
js = zerojs;
first_pid = NO_PID;
pid_wrap = -1;
}
/* Return the working directory for the current process. Unlike
job_working_directory, this does not call malloc (), nor do any
of the functions it calls. This is so that it can safely be called
from a signal handler. */
static char *
current_working_directory ()
{
char *dir;
static char d[PATH_MAX];
dir = get_string_value ("PWD");
if (dir == 0 && the_current_working_directory && no_symbolic_links)
dir = the_current_working_directory;
if (dir == 0)
{
dir = getcwd (d, sizeof(d));
if (dir)
dir = d;
}
return (dir == 0) ? "" : dir;
}
/* Return the working directory for the current process. */
static char *
job_working_directory ()
{
char *dir;
dir = get_string_value ("PWD");
if (dir)
return (savestring (dir));
dir = get_working_directory ("job-working-directory");
if (dir)
return (dir);
return (savestring (""));
}
void
making_children ()
{
if (already_making_children)
return;
already_making_children = 1;
start_pipeline ();
}
void
stop_making_children ()
{
already_making_children = 0;
}
void
cleanup_the_pipeline ()
{
PROCESS *disposer;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
disposer = the_pipeline;
the_pipeline = (PROCESS *)NULL;
UNBLOCK_CHILD (oset);
if (disposer)
discard_pipeline (disposer);
}
void
save_pipeline (clear)
int clear;
{
saved_pipeline = the_pipeline;
if (clear)
the_pipeline = (PROCESS *)NULL;
saved_already_making_children = already_making_children;
}
void
restore_pipeline (discard)
int discard;
{
PROCESS *old_pipeline;
old_pipeline = the_pipeline;
the_pipeline = saved_pipeline;
already_making_children = saved_already_making_children;
if (discard && old_pipeline)
discard_pipeline (old_pipeline);
}
/* Start building a pipeline. */
void
start_pipeline ()
{
if (the_pipeline)
{
cleanup_the_pipeline ();
pipeline_pgrp = 0;
#if defined (PGRP_PIPE)
sh_closepipe (pgrp_pipe);
#endif
}
#if defined (PGRP_PIPE)
if (job_control)
{
if (pipe (pgrp_pipe) == -1)
sys_error (_("start_pipeline: pgrp pipe"));
}
#endif
}
/* Stop building a pipeline. Install the process list in the job array.
This returns the index of the newly installed job.
DEFERRED is a command structure to be executed upon satisfactory
execution exit of this pipeline. */
int
stop_pipeline (async, deferred)
int async;
COMMAND *deferred;
{
register int i, j;
JOB *newjob;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
#if defined (PGRP_PIPE)
/* The parent closes the process group synchronization pipe. */
sh_closepipe (pgrp_pipe);
#endif
cleanup_dead_jobs ();
if (js.j_jobslots == 0)
{
js.j_jobslots = JOB_SLOTS;
jobs = (JOB **)xmalloc (js.j_jobslots * sizeof (JOB *));
/* Now blank out these new entries. */
for (i = 0; i < js.j_jobslots; i++)
jobs[i] = (JOB *)NULL;
js.j_firstj = js.j_lastj = js.j_njobs = 0;
}
/* Scan from the last slot backward, looking for the next free one. */
/* XXX - revisit this interactive assumption */
/* XXX - this way for now */
if (interactive)
{
for (i = js.j_jobslots; i; i--)
if (jobs[i - 1])
break;
}
else
{
#if 0
/* This wraps around, but makes it inconvenient to extend the array */
for (i = js.j_lastj+1; i != js.j_lastj; i++)
{
if (i >= js.j_jobslots)
i = 0;
if (jobs[i] == 0)
break;
}
if (i == js.j_lastj)
i = js.j_jobslots;
#else
/* This doesn't wrap around yet. */
for (i = js.j_lastj ? js.j_lastj + 1 : js.j_lastj; i < js.j_jobslots; i++)
if (jobs[i] == 0)
break;
#endif
}
/* Do we need more room? */
/* First try compaction */
if ((interactive_shell == 0 || subshell_environment) && i == js.j_jobslots && js.j_jobslots >= MAX_JOBS_IN_ARRAY)
i = compact_jobs_list (0);
/* If we can't compact, reallocate */
if (i == js.j_jobslots)
{
js.j_jobslots += JOB_SLOTS;
jobs = (JOB **)xrealloc (jobs, (js.j_jobslots * sizeof (JOB *)));
for (j = i; j < js.j_jobslots; j++)
jobs[j] = (JOB *)NULL;
}
/* Add the current pipeline to the job list. */
if (the_pipeline)
{
register PROCESS *p;
int any_running, any_stopped, n;
newjob = (JOB *)xmalloc (sizeof (JOB));
for (n = 1, p = the_pipeline; p->next != the_pipeline; n++, p = p->next)
;
p->next = (PROCESS *)NULL;
newjob->pipe = REVERSE_LIST (the_pipeline, PROCESS *);
for (p = newjob->pipe; p->next; p = p->next)
;
p->next = newjob->pipe;
the_pipeline = (PROCESS *)NULL;
newjob->pgrp = pipeline_pgrp;
pipeline_pgrp = 0;
newjob->flags = 0;
/* Flag to see if in another pgrp. */
if (job_control)
newjob->flags |= J_JOBCONTROL;
/* Set the state of this pipeline. */
p = newjob->pipe;
any_running = any_stopped = 0;
do
{
any_running |= PRUNNING (p);
any_stopped |= PSTOPPED (p);
p = p->next;
}
while (p != newjob->pipe);
newjob->state = any_running ? JRUNNING : (any_stopped ? JSTOPPED : JDEAD);
newjob->wd = job_working_directory ();
newjob->deferred = deferred;
newjob->j_cleanup = (sh_vptrfunc_t *)NULL;
newjob->cleanarg = (PTR_T) NULL;
jobs[i] = newjob;
if (newjob->state == JDEAD && (newjob->flags & J_FOREGROUND))
setjstatus (i);
if (newjob->state == JDEAD)
{
js.c_reaped += n; /* wouldn't have been done since this was not part of a job */
js.j_ndead++;
}
js.c_injobs += n;
js.j_lastj = i;
js.j_njobs++;
}
else
newjob = (JOB *)NULL;
if (newjob)
js.j_lastmade = newjob;
if (async)
{
if (newjob)
{
newjob->flags &= ~J_FOREGROUND;
newjob->flags |= J_ASYNC;
js.j_lastasync = newjob;
}
reset_current ();
}
else
{
if (newjob)
{
newjob->flags |= J_FOREGROUND;
/*
* !!!!! NOTE !!!!! (chet@ins.cwru.edu)
*
* The currently-accepted job control wisdom says to set the
* terminal's process group n+1 times in an n-step pipeline:
* once in the parent and once in each child. This is where
* the parent gives it away.
*
* Don't give the terminal away if this shell is an asynchronous
* subshell.
*
*/
if (job_control && newjob->pgrp && (subshell_environment&SUBSHELL_ASYNC) == 0)
maybe_give_terminal_to (shell_pgrp, newjob->pgrp, 0);
}
}
stop_making_children ();
UNBLOCK_CHILD (oset);
return (newjob ? i : js.j_current);
}
/* Functions to manage the list of exited background pids whose status has
been saved. */
static struct pidstat *
bgp_alloc (pid, status)
pid_t pid;
int status;
{
struct pidstat *ps;
ps = (struct pidstat *)xmalloc (sizeof (struct pidstat));
ps->pid = pid;
ps->status = status;
ps->next = (struct pidstat *)0;
return ps;
}
static struct pidstat *
bgp_add (pid, status)
pid_t pid;
int status;
{
struct pidstat *ps;
ps = bgp_alloc (pid, status);
if (bgpids.list == 0)
{
bgpids.list = bgpids.end = ps;
bgpids.npid = 0; /* just to make sure */
}
else
{
bgpids.end->next = ps;
bgpids.end = ps;
}
bgpids.npid++;
if (bgpids.npid > js.c_childmax)
bgp_prune ();
return ps;
}
static int
bgp_delete (pid)
pid_t pid;
{
struct pidstat *prev, *p;
for (prev = p = bgpids.list; p; prev = p, p = p->next)
if (p->pid == pid)
{
prev->next = p->next; /* remove from list */
break;
}
if (p == 0)
return 0; /* not found */
#if defined (DEBUG)
itrace("bgp_delete: deleting %d", pid);
#endif
/* Housekeeping in the border cases. */
if (p == bgpids.list)
bgpids.list = bgpids.list->next;
else if (p == bgpids.end)
bgpids.end = prev;
bgpids.npid--;
if (bgpids.npid == 0)
bgpids.list = bgpids.end = 0;
else if (bgpids.npid == 1)
bgpids.end = bgpids.list; /* just to make sure */
free (p);
return 1;
}
/* Clear out the list of saved statuses */
static void
bgp_clear ()
{
struct pidstat *ps, *p;
for (ps = bgpids.list; ps; )
{
p = ps;
ps = ps->next;
free (p);
}
bgpids.list = bgpids.end = 0;
bgpids.npid = 0;
}
/* Search for PID in the list of saved background pids; return its status if
found. If not found, return -1. */
static int
bgp_search (pid)
pid_t pid;
{
struct pidstat *ps;
for (ps = bgpids.list ; ps; ps = ps->next)
if (ps->pid == pid)
return ps->status;
return -1;
}
static void
bgp_prune ()
{
struct pidstat *ps;
while (bgpids.npid > js.c_childmax)
{
ps = bgpids.list;
bgpids.list = bgpids.list->next;
free (ps);
bgpids.npid--;
}
}
/* Reset the values of js.j_lastj and js.j_firstj after one or both have
been deleted. The caller should check whether js.j_njobs is 0 before
calling this. This wraps around, but the rest of the code does not. At
this point, it should not matter. */
static void
reset_job_indices ()
{
int old;
if (jobs[js.j_firstj] == 0)
{
old = js.j_firstj++;
if (old >= js.j_jobslots)
old = js.j_jobslots - 1;
while (js.j_firstj != old)
{
if (js.j_firstj >= js.j_jobslots)
js.j_firstj = 0;
if (jobs[js.j_firstj] || js.j_firstj == old) /* needed if old == 0 */
break;
js.j_firstj++;
}
if (js.j_firstj == old)
js.j_firstj = js.j_lastj = js.j_njobs = 0;
}
if (jobs[js.j_lastj] == 0)
{
old = js.j_lastj--;
if (old < 0)
old = 0;
while (js.j_lastj != old)
{
if (js.j_lastj < 0)
js.j_lastj = js.j_jobslots - 1;
if (jobs[js.j_lastj] || js.j_lastj == old) /* needed if old == js.j_jobslots */
break;
js.j_lastj--;
}
if (js.j_lastj == old)
js.j_firstj = js.j_lastj = js.j_njobs = 0;
}
}
/* Delete all DEAD jobs that the user had received notification about. */
static void
cleanup_dead_jobs ()
{
register int i;
int os;
if (js.j_jobslots == 0 || jobs_list_frozen)
return;
QUEUE_SIGCHLD(os);
/* XXX could use js.j_firstj and js.j_lastj here */
for (i = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("cleanup_dead_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i))
delete_job (i, 0);
}
#if defined (COPROCESS_SUPPORT)
coproc_reap ();
#endif
UNQUEUE_SIGCHLD(os);
}
static int
processes_in_job (job)
int job;
{
int nproc;
register PROCESS *p;
nproc = 0;
p = jobs[job]->pipe;
do
{
p = p->next;
nproc++;
}
while (p != jobs[job]->pipe);
return nproc;
}
static void
delete_old_job (pid)
pid_t pid;
{
PROCESS *p;
int job;
job = find_job (pid, 0, &p);
if (job != NO_JOB)
{
#ifdef DEBUG
itrace ("delete_old_job: found pid %d in job %d with state %d", pid, job, jobs[job]->state);
#endif
if (JOBSTATE (job) == JDEAD)
delete_job (job, DEL_NOBGPID);
else
{
internal_warning (_("forked pid %d appears in running job %d"), pid, job);
if (p)
p->pid = 0;
}
}
}
/* Reallocate and compress the jobs list. This returns with a jobs array
whose size is a multiple of JOB_SLOTS and can hold the current number of
jobs. Heuristics are used to minimize the number of new reallocs. */
static void
realloc_jobs_list ()
{
sigset_t set, oset;
int nsize, i, j, ncur, nprev;
JOB **nlist;
ncur = nprev = NO_JOB;
nsize = ((js.j_njobs + JOB_SLOTS - 1) / JOB_SLOTS);
nsize *= JOB_SLOTS;
i = js.j_njobs % JOB_SLOTS;
if (i == 0 || i > (JOB_SLOTS >> 1))
nsize += JOB_SLOTS;
BLOCK_CHILD (set, oset);
nlist = (js.j_jobslots == nsize) ? jobs : (JOB **) xmalloc (nsize * sizeof (JOB *));
js.c_reaped = js.j_ndead = 0;
for (i = j = 0; i < js.j_jobslots; i++)
if (jobs[i])
{
if (i == js.j_current)
ncur = j;
if (i == js.j_previous)
nprev = j;
nlist[j++] = jobs[i];
if (jobs[i]->state == JDEAD)
{
js.j_ndead++;
js.c_reaped += processes_in_job (i);
}
}
#if defined (DEBUG)
itrace ("realloc_jobs_list: resize jobs list from %d to %d", js.j_jobslots, nsize);
itrace ("realloc_jobs_list: j_lastj changed from %d to %d", js.j_lastj, (j > 0) ? j - 1 : 0);
itrace ("realloc_jobs_list: j_njobs changed from %d to %d", js.j_njobs, j);
itrace ("realloc_jobs_list: js.j_ndead %d js.c_reaped %d", js.j_ndead, js.c_reaped);
#endif
js.j_firstj = 0;
js.j_lastj = (j > 0) ? j - 1 : 0;
js.j_njobs = j;
js.j_jobslots = nsize;
/* Zero out remaining slots in new jobs list */
for ( ; j < nsize; j++)
nlist[j] = (JOB *)NULL;
if (jobs != nlist)
{
free (jobs);
jobs = nlist;
}
if (ncur != NO_JOB)
js.j_current = ncur;
if (nprev != NO_JOB)
js.j_previous = nprev;
/* Need to reset these */
if (js.j_current == NO_JOB || js.j_previous == NO_JOB || js.j_current > js.j_lastj || js.j_previous > js.j_lastj)
reset_current ();
#ifdef DEBUG
itrace ("realloc_jobs_list: reset js.j_current (%d) and js.j_previous (%d)", js.j_current, js.j_previous);
#endif
UNBLOCK_CHILD (oset);
}
/* Compact the jobs list by removing dead jobs. Assumed that we have filled
the jobs array to some predefined maximum. Called when the shell is not
the foreground process (subshell_environment != 0). Returns the first
available slot in the compacted list. If that value is js.j_jobslots, then
the list needs to be reallocated. The jobs array may be in new memory if
this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */
static int
compact_jobs_list (flags)
int flags;
{
if (js.j_jobslots == 0 || jobs_list_frozen)
return js.j_jobslots;
reap_dead_jobs ();
realloc_jobs_list ();
#ifdef DEBUG
itrace("compact_jobs_list: returning %d", (js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
#endif
return ((js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
}
/* Delete the job at INDEX from the job list. Must be called
with SIGCHLD blocked. */
void
delete_job (job_index, dflags)
int job_index, dflags;
{
register JOB *temp;
PROCESS *proc;
int ndel;
if (js.j_jobslots == 0 || jobs_list_frozen)
return;
if ((dflags & DEL_WARNSTOPPED) && subshell_environment == 0 && STOPPED (job_index))
internal_warning (_("deleting stopped job %d with process group %ld"), job_index+1, (long)jobs[job_index]->pgrp);
temp = jobs[job_index];
if (temp == 0)
return;
if ((dflags & DEL_NOBGPID) == 0)
{
proc = find_last_proc (job_index, 0);
/* Could do this just for J_ASYNC jobs, but we save all. */
if (proc)
bgp_add (proc->pid, process_exit_status (proc->status));
}
jobs[job_index] = (JOB *)NULL;
if (temp == js.j_lastmade)
js.j_lastmade = 0;
else if (temp == js.j_lastasync)
js.j_lastasync = 0;
free (temp->wd);
ndel = discard_pipeline (temp->pipe);
js.c_injobs -= ndel;
if (temp->state == JDEAD)
{
js.c_reaped -= ndel;
js.j_ndead--;
if (js.c_reaped < 0)
{
#ifdef DEBUG
itrace("delete_job (%d pgrp %d): js.c_reaped (%d) < 0 ndel = %d js.j_ndead = %d", job_index, temp->pgrp, js.c_reaped, ndel, js.j_ndead);
#endif
js.c_reaped = 0;
}
}
if (temp->deferred)
dispose_command (temp->deferred);
free (temp);
js.j_njobs--;
if (js.j_njobs == 0)
js.j_firstj = js.j_lastj = 0;
else if (jobs[js.j_firstj] == 0 || jobs[js.j_lastj] == 0)
reset_job_indices ();
if (job_index == js.j_current || job_index == js.j_previous)
reset_current ();
}
/* Must be called with SIGCHLD blocked. */
void
nohup_job (job_index)
int job_index;
{
register JOB *temp;
if (js.j_jobslots == 0)
return;
if (temp = jobs[job_index])
temp->flags |= J_NOHUP;
}
/* Get rid of the data structure associated with a process chain. */
static int
discard_pipeline (chain)
register PROCESS *chain;
{
register PROCESS *this, *next;
int n;
this = chain;
n = 0;
do
{
next = this->next;
FREE (this->command);
free (this);
n++;
this = next;
}
while (this != chain);
return n;
}
/* Add this process to the chain being built in the_pipeline.
NAME is the command string that will be exec'ed later.
PID is the process id of the child. */
static void
add_process (name, pid)
char *name;
pid_t pid;
{
PROCESS *t, *p;
#if defined (RECYCLES_PIDS)
int j;
p = find_process (pid, 0, &j);
if (p)
{
# ifdef DEBUG
if (j == NO_JOB)
internal_warning (_("add_process: process %5ld (%s) in the_pipeline"), (long)p->pid, p->command);
# endif
if (PALIVE (p))
internal_warning (_("add_process: pid %5ld (%s) marked as still alive"), (long)p->pid, p->command);
p->running = PS_RECYCLED; /* mark as recycled */
}
#endif
t = (PROCESS *)xmalloc (sizeof (PROCESS));
t->next = the_pipeline;
t->pid = pid;
WSTATUS (t->status) = 0;
t->running = PS_RUNNING;
t->command = name;
the_pipeline = t;
if (t->next == 0)
t->next = t;
else
{
p = t->next;
while (p->next != t->next)
p = p->next;
p->next = t;
}
}
/* Create a (dummy) PROCESS with NAME, PID, and STATUS, and make it the last
process in jobs[JID]->pipe. Used by the lastpipe code. */
void
append_process (name, pid, status, jid)
char *name;
pid_t pid;
int status;
int jid;
{
PROCESS *t, *p;
t = (PROCESS *)xmalloc (sizeof (PROCESS));
t->next = (PROCESS *)NULL;
t->pid = pid;
/* set process exit status using offset discovered by configure */
t->status = (status & 0xff) << WEXITSTATUS_OFFSET;
t->running = PS_DONE;
t->command = name;
js.c_reaped++; /* XXX */
for (p = jobs[jid]->pipe; p->next != jobs[jid]->pipe; p = p->next)
;
p->next = t;
t->next = jobs[jid]->pipe;
}
#if 0
/* Take the last job and make it the first job. Must be called with
SIGCHLD blocked. */
int
rotate_the_pipeline ()
{
PROCESS *p;
if (the_pipeline->next == the_pipeline)
return;
for (p = the_pipeline; p->next != the_pipeline; p = p->next)
;
the_pipeline = p;
}
/* Reverse the order of the processes in the_pipeline. Must be called with
SIGCHLD blocked. */
int
reverse_the_pipeline ()
{
PROCESS *p, *n;
if (the_pipeline->next == the_pipeline)
return;
for (p = the_pipeline; p->next != the_pipeline; p = p->next)
;
p->next = (PROCESS *)NULL;
n = REVERSE_LIST (the_pipeline, PROCESS *);
the_pipeline = n;
for (p = the_pipeline; p->next; p = p->next)
;
p->next = the_pipeline;
}
#endif
/* Map FUNC over the list of jobs. If FUNC returns non-zero,
then it is time to stop mapping, and that is the return value
for map_over_jobs. FUNC is called with a JOB, arg1, arg2,
and INDEX. */
static int
map_over_jobs (func, arg1, arg2)
sh_job_map_func_t *func;
int arg1, arg2;
{
register int i;
int result;
sigset_t set, oset;
if (js.j_jobslots == 0)
return 0;
BLOCK_CHILD (set, oset);
/* XXX could use js.j_firstj here */
for (i = result = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("map_over_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("map_over_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i])
{
result = (*func)(jobs[i], arg1, arg2, i);
if (result)
break;
}
}
UNBLOCK_CHILD (oset);
return (result);
}
/* Cause all the jobs in the current pipeline to exit. */
void
terminate_current_pipeline ()
{
if (pipeline_pgrp && pipeline_pgrp != shell_pgrp)
{
killpg (pipeline_pgrp, SIGTERM);
killpg (pipeline_pgrp, SIGCONT);
}
}
/* Cause all stopped jobs to exit. */
void
terminate_stopped_jobs ()
{
register int i;
/* XXX could use js.j_firstj here */
for (i = 0; i < js.j_jobslots; i++)
{
if (jobs[i] && STOPPED (i))
{
killpg (jobs[i]->pgrp, SIGTERM);
killpg (jobs[i]->pgrp, SIGCONT);
}
}
}
/* Cause all jobs, running or stopped, to receive a hangup signal. If
a job is marked J_NOHUP, don't send the SIGHUP. */
void
hangup_all_jobs ()
{
register int i;
/* XXX could use js.j_firstj here */
for (i = 0; i < js.j_jobslots; i++)
{
if (jobs[i])
{
if (jobs[i]->flags & J_NOHUP)
continue;
killpg (jobs[i]->pgrp, SIGHUP);
if (STOPPED (i))
killpg (jobs[i]->pgrp, SIGCONT);
}
}
}
void
kill_current_pipeline ()
{
stop_making_children ();
start_pipeline ();
}
/* Return the pipeline that PID belongs to. Note that the pipeline
doesn't have to belong to a job. Must be called with SIGCHLD blocked.
If JOBP is non-null, return the index of the job containing PID. */
static PROCESS *
find_pipeline (pid, alive_only, jobp)
pid_t pid;
int alive_only;
int *jobp; /* index into jobs list or NO_JOB */
{
int job;
PROCESS *p;
/* See if this process is in the pipeline that we are building. */
if (jobp)
*jobp = NO_JOB;
if (the_pipeline)
{
p = the_pipeline;
do
{
/* Return it if we found it. Don't ever return a recycled pid. */
if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
return (p);
p = p->next;
}
while (p != the_pipeline);
}
job = find_job (pid, alive_only, &p);
if (jobp)
*jobp = job;
return (job == NO_JOB) ? (PROCESS *)NULL : jobs[job]->pipe;
}
/* Return the PROCESS * describing PID. If JOBP is non-null return the index
into the jobs array of the job containing PID. Must be called with
SIGCHLD blocked. */
static PROCESS *
find_process (pid, alive_only, jobp)
pid_t pid;
int alive_only;
int *jobp; /* index into jobs list or NO_JOB */
{
PROCESS *p;
p = find_pipeline (pid, alive_only, jobp);
while (p && p->pid != pid)
p = p->next;
return p;
}
/* Return the job index that PID belongs to, or NO_JOB if it doesn't
belong to any job. Must be called with SIGCHLD blocked. */
static int
find_job (pid, alive_only, procp)
pid_t pid;
int alive_only;
PROCESS **procp;
{
register int i;
PROCESS *p;
/* XXX could use js.j_firstj here, and should check js.j_lastj */
for (i = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("find_job: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("find_job: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i])
{
p = jobs[i]->pipe;
do
{
if (p->pid == pid && ((alive_only == 0 && PRECYCLED(p) == 0) || PALIVE(p)))
{
if (procp)
*procp = p;
return (i);
}
p = p->next;
}
while (p != jobs[i]->pipe);
}
}
return (NO_JOB);
}
/* Find a job given a PID. If BLOCK is non-zero, block SIGCHLD as
required by find_job. */
int
get_job_by_pid (pid, block)
pid_t pid;
int block;
{
int job;
sigset_t set, oset;
if (block)
BLOCK_CHILD (set, oset);
job = find_job (pid, 0, NULL);
if (block)
UNBLOCK_CHILD (oset);
return job;
}
/* Print descriptive information about the job with leader pid PID. */
void
describe_pid (pid)
pid_t pid;
{
int job;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
job = find_job (pid, 0, NULL);
if (job != NO_JOB)
fprintf (stderr, "[%d] %ld\n", job + 1, (long)pid);
else
programming_error (_("describe_pid: %ld: no such pid"), (long)pid);
UNBLOCK_CHILD (oset);
}
static char *
j_strsignal (s)
int s;
{
char *x;
x = strsignal (s);
if (x == 0)
{
x = retcode_name_buffer;
sprintf (x, _("Signal %d"), s);
}
return x;
}
static char *
printable_job_status (j, p, format)
int j;
PROCESS *p;
int format;
{
static char *temp;
int es;
temp = _("Done");
if (STOPPED (j) && format == 0)
{
if (posixly_correct == 0 || p == 0 || (WIFSTOPPED (p->status) == 0))
temp = _("Stopped");
else
{
temp = retcode_name_buffer;
sprintf (temp, _("Stopped(%s)"), signal_name (WSTOPSIG (p->status)));
}
}
else if (RUNNING (j))
temp = _("Running");
else
{
if (WIFSTOPPED (p->status))
temp = j_strsignal (WSTOPSIG (p->status));
else if (WIFSIGNALED (p->status))
temp = j_strsignal (WTERMSIG (p->status));
else if (WIFEXITED (p->status))
{
temp = retcode_name_buffer;
es = WEXITSTATUS (p->status);
if (es == 0)
strcpy (temp, _("Done"));
else if (posixly_correct)
sprintf (temp, _("Done(%d)"), es);
else
sprintf (temp, _("Exit %d"), es);
}
else
temp = _("Unknown status");
}
return temp;
}
/* This is the way to print out information on a job if you
know the index. FORMAT is:
JLIST_NORMAL) [1]+ Running emacs
JLIST_LONG ) [1]+ 2378 Running emacs
-1 ) [1]+ 2378 emacs
JLIST_NORMAL) [1]+ Stopped ls | more
JLIST_LONG ) [1]+ 2369 Stopped ls
2367 | more
JLIST_PID_ONLY)
Just list the pid of the process group leader (really
the process group).
JLIST_CHANGED_ONLY)
Use format JLIST_NORMAL, but list only jobs about which
the user has not been notified. */
/* Print status for pipeline P. If JOB_INDEX is >= 0, it is the index into
the JOBS array corresponding to this pipeline. FORMAT is as described
above. Must be called with SIGCHLD blocked.
If you're printing a pipeline that's not in the jobs array, like the
current pipeline as it's being created, pass -1 for JOB_INDEX */
static void
print_pipeline (p, job_index, format, stream)
PROCESS *p;
int job_index, format;
FILE *stream;
{
PROCESS *first, *last, *show;
int es, name_padding;
char *temp;
if (p == 0)
return;
first = last = p;
while (last->next != first)
last = last->next;
for (;;)
{
if (p != first)
fprintf (stream, format ? " " : " |");
if (format != JLIST_STANDARD)
fprintf (stream, "%5ld", (long)p->pid);
fprintf (stream, " ");
if (format > -1 && job_index >= 0)
{
show = format ? p : last;
temp = printable_job_status (job_index, show, format);
if (p != first)
{
if (format)
{
if (show->running == first->running &&
WSTATUS (show->status) == WSTATUS (first->status))
temp = "";
}
else
temp = (char *)NULL;
}
if (temp)
{
fprintf (stream, "%s", temp);
es = STRLEN (temp);
if (es == 0)
es = 2; /* strlen ("| ") */
name_padding = LONGEST_SIGNAL_DESC - es;
fprintf (stream, "%*s", name_padding, "");
if ((WIFSTOPPED (show->status) == 0) &&
(WIFCONTINUED (show->status) == 0) &&
WIFCORED (show->status))
fprintf (stream, _("(core dumped) "));
}
}
if (p != first && format)
fprintf (stream, "| ");
if (p->command)
fprintf (stream, "%s", p->command);
if (p == last && job_index >= 0)
{
temp = current_working_directory ();
if (RUNNING (job_index) && (IS_FOREGROUND (job_index) == 0))
fprintf (stream, " &");
if (strcmp (temp, jobs[job_index]->wd) != 0)
fprintf (stream,
_(" (wd: %s)"), polite_directory_format (jobs[job_index]->wd));
}
if (format || (p == last))
{
/* We need to add a CR only if this is an interactive shell, and
we're reporting the status of a completed job asynchronously.
We can't really check whether this particular job is being
reported asynchronously, so just add the CR if the shell is
currently interactive and asynchronous notification is enabled. */
if (asynchronous_notification && interactive)
fprintf (stream, "\r\n");
else
fprintf (stream, "\n");
}
if (p == last)
break;
p = p->next;
}
fflush (stream);
}
/* Print information to STREAM about jobs[JOB_INDEX] according to FORMAT.
Must be called with SIGCHLD blocked or queued with queue_sigchld */
static void
pretty_print_job (job_index, format, stream)
int job_index, format;
FILE *stream;
{
register PROCESS *p;
/* Format only pid information about the process group leader? */
if (format == JLIST_PID_ONLY)
{
fprintf (stream, "%ld\n", (long)jobs[job_index]->pipe->pid);
return;
}
if (format == JLIST_CHANGED_ONLY)
{
if (IS_NOTIFIED (job_index))
return;
format = JLIST_STANDARD;
}
if (format != JLIST_NONINTERACTIVE)
fprintf (stream, "[%d]%c ", job_index + 1,
(job_index == js.j_current) ? '+':
(job_index == js.j_previous) ? '-' : ' ');
if (format == JLIST_NONINTERACTIVE)
format = JLIST_LONG;
p = jobs[job_index]->pipe;
print_pipeline (p, job_index, format, stream);
/* We have printed information about this job. When the job's
status changes, waitchld () sets the notification flag to 0. */
jobs[job_index]->flags |= J_NOTIFIED;
}
static int
print_job (job, format, state, job_index)
JOB *job;
int format, state, job_index;
{
if (state == -1 || (JOB_STATE)state == job->state)
pretty_print_job (job_index, format, stdout);
return (0);
}
void
list_one_job (job, format, ignore, job_index)
JOB *job;
int format, ignore, job_index;
{
pretty_print_job (job_index, format, stdout);
}
void
list_stopped_jobs (format)
int format;
{
cleanup_dead_jobs ();
map_over_jobs (print_job, format, (int)JSTOPPED);
}
void
list_running_jobs (format)
int format;
{
cleanup_dead_jobs ();
map_over_jobs (print_job, format, (int)JRUNNING);
}
/* List jobs. If FORMAT is non-zero, then the long form of the information
is printed, else just a short version. */
void
list_all_jobs (format)
int format;
{
cleanup_dead_jobs ();
map_over_jobs (print_job, format, -1);
}
/* Fork, handling errors. Returns the pid of the newly made child, or 0.
COMMAND is just for remembering the name of the command; we don't do
anything else with it. ASYNC_P says what to do with the tty. If
non-zero, then don't give it away. */
pid_t
make_child (command, async_p)
char *command;
int async_p;
{
int forksleep;
sigset_t set, oset;
pid_t pid;
sigemptyset (&set);
sigaddset (&set, SIGCHLD);
sigaddset (&set, SIGINT);
sigemptyset (&oset);
sigprocmask (SIG_BLOCK, &set, &oset);
making_children ();
forksleep = 1;
#if defined (BUFFERED_INPUT)
/* If default_buffered_input is active, we are reading a script. If
the command is asynchronous, we have already duplicated /dev/null
as fd 0, but have not changed the buffered stream corresponding to
the old fd 0. We don't want to sync the stream in this case. */
if (default_buffered_input != -1 &&
(!async_p || default_buffered_input > 0))
sync_buffered_stream (default_buffered_input);
#endif /* BUFFERED_INPUT */
/* Create the child, handle severe errors. Retry on EAGAIN. */
while ((pid = fork ()) < 0 && errno == EAGAIN && forksleep < FORKSLEEP_MAX)
{
/* bash-4.2 */
/* If we can't create any children, try to reap some dead ones. */
waitchld (-1, 0);
sys_error ("fork: retry");
if (sleep (forksleep) != 0)
break;
forksleep <<= 1;
}
if (pid < 0)
{
sys_error ("fork");
/* Kill all of the processes in the current pipeline. */
terminate_current_pipeline ();
/* Discard the current pipeline, if any. */
if (the_pipeline)
kill_current_pipeline ();
last_command_exit_value = EX_NOEXEC;
throw_to_top_level (); /* Reset signals, etc. */
}
if (pid == 0)
{
/* In the child. Give this child the right process group, set the
signals to the default state for a new process. */
pid_t mypid;
mypid = getpid ();
#if defined (BUFFERED_INPUT)
/* Close default_buffered_input if it's > 0. We don't close it if it's
0 because that's the file descriptor used when redirecting input,
and it's wrong to close the file in that case. */
unset_bash_input (0);
#endif /* BUFFERED_INPUT */
/* Restore top-level signal mask. */
sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
if (job_control)
{
/* All processes in this pipeline belong in the same
process group. */
if (pipeline_pgrp == 0) /* This is the first child. */
pipeline_pgrp = mypid;
/* Check for running command in backquotes. */
if (pipeline_pgrp == shell_pgrp)
ignore_tty_job_signals ();
else
default_tty_job_signals ();
/* Set the process group before trying to mess with the terminal's
process group. This is mandated by POSIX. */
/* This is in accordance with the Posix 1003.1 standard,
section B.7.2.4, which says that trying to set the terminal
process group with tcsetpgrp() to an unused pgrp value (like
this would have for the first child) is an error. Section
B.4.3.3, p. 237 also covers this, in the context of job control
shells. */
if (setpgid (mypid, pipeline_pgrp) < 0)
sys_error (_("child setpgid (%ld to %ld)"), (long)mypid, (long)pipeline_pgrp);
/* By convention (and assumption above), if
pipeline_pgrp == shell_pgrp, we are making a child for
command substitution.
In this case, we don't want to give the terminal to the
shell's process group (we could be in the middle of a
pipeline, for example). */
if (async_p == 0 && pipeline_pgrp != shell_pgrp && ((subshell_environment&SUBSHELL_ASYNC) == 0))
give_terminal_to (pipeline_pgrp, 0);
#if defined (PGRP_PIPE)
if (pipeline_pgrp == mypid)
pipe_read (pgrp_pipe);
#endif
}
else /* Without job control... */
{
if (pipeline_pgrp == 0)
pipeline_pgrp = shell_pgrp;
/* If these signals are set to SIG_DFL, we encounter the curious
situation of an interactive ^Z to a running process *working*
and stopping the process, but being unable to do anything with
that process to change its state. On the other hand, if they
are set to SIG_IGN, jobs started from scripts do not stop when
the shell running the script gets a SIGTSTP and stops. */
default_tty_job_signals ();
}
#if defined (PGRP_PIPE)
/* Release the process group pipe, since our call to setpgid ()
is done. The last call to sh_closepipe is done in stop_pipeline. */
sh_closepipe (pgrp_pipe);
#endif /* PGRP_PIPE */
#if 0
/* Don't set last_asynchronous_pid in the child */
if (async_p)
last_asynchronous_pid = mypid; /* XXX */
else
#endif
#if defined (RECYCLES_PIDS)
if (last_asynchronous_pid == mypid)
/* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
last_asynchronous_pid = 1;
#endif
}
else
{
/* In the parent. Remember the pid of the child just created
as the proper pgrp if this is the first child. */
if (first_pid == NO_PID)
first_pid = pid;
else if (pid_wrap == -1 && pid < first_pid)
pid_wrap = 0;
else if (pid_wrap == 0 && pid >= first_pid)
pid_wrap = 1;
if (job_control)
{
if (pipeline_pgrp == 0)
{
pipeline_pgrp = pid;
/* Don't twiddle terminal pgrps in the parent! This is the bug,
not the good thing of twiddling them in the child! */
/* give_terminal_to (pipeline_pgrp, 0); */
}
/* This is done on the recommendation of the Rationale section of
the POSIX 1003.1 standard, where it discusses job control and
shells. It is done to avoid possible race conditions. (Ref.
1003.1 Rationale, section B.4.3.3, page 236). */
setpgid (pid, pipeline_pgrp);
}
else
{
if (pipeline_pgrp == 0)
pipeline_pgrp = shell_pgrp;
}
/* Place all processes into the jobs array regardless of the
state of job_control. */
add_process (command, pid);
if (async_p)
last_asynchronous_pid = pid;
#if defined (RECYCLES_PIDS)
else if (last_asynchronous_pid == pid)
/* Avoid pid aliasing. 1 seems like a safe, unusual pid value. */
last_asynchronous_pid = 1;
#endif
if (pid_wrap > 0)
delete_old_job (pid);
#if !defined (RECYCLES_PIDS)
/* Only check for saved status if we've saved more than CHILD_MAX
statuses, unless the system recycles pids. */
if ((js.c_reaped + bgpids.npid) >= js.c_childmax)
#endif
bgp_delete (pid); /* new process, discard any saved status */
last_made_pid = pid;
/* keep stats */
js.c_totforked++;
js.c_living++;
/* Unblock SIGINT and SIGCHLD unless creating a pipeline, in which case
SIGCHLD remains blocked until all commands in the pipeline have been
created. */
sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
}
return (pid);
}
/* These two functions are called only in child processes. */
void
ignore_tty_job_signals ()
{
set_signal_handler (SIGTSTP, SIG_IGN);
set_signal_handler (SIGTTIN, SIG_IGN);
set_signal_handler (SIGTTOU, SIG_IGN);
}
void
default_tty_job_signals ()
{
set_signal_handler (SIGTSTP, SIG_DFL);
set_signal_handler (SIGTTIN, SIG_DFL);
set_signal_handler (SIGTTOU, SIG_DFL);
}
/* When we end a job abnormally, or if we stop a job, we set the tty to the
state kept in here. When a job ends normally, we set the state in here
to the state of the tty. */
static TTYSTRUCT shell_tty_info;
#if defined (NEW_TTY_DRIVER)
static struct tchars shell_tchars;
static struct ltchars shell_ltchars;
#endif /* NEW_TTY_DRIVER */
#if defined (NEW_TTY_DRIVER) && defined (DRAIN_OUTPUT)
/* Since the BSD tty driver does not allow us to change the tty modes
while simultaneously waiting for output to drain and preserving
typeahead, we have to drain the output ourselves before calling
ioctl. We cheat by finding the length of the output queue, and
using select to wait for an appropriate length of time. This is
a hack, and should be labeled as such (it's a hastily-adapted
mutation of a `usleep' implementation). It's only reason for
existing is the flaw in the BSD tty driver. */
static int ttspeeds[] =
{
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1800, 2400, 4800, 9600, 19200, 38400
};
static void
draino (fd, ospeed)
int fd, ospeed;
{
register int delay = ttspeeds[ospeed];
int n;
if (!delay)
return;
while ((ioctl (fd, TIOCOUTQ, &n) == 0) && n)
{
if (n > (delay / 100))
{
struct timeval tv;
n *= 10; /* 2 bits more for conservativeness. */
tv.tv_sec = n / delay;
tv.tv_usec = ((n % delay) * 1000000) / delay;
select (fd, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
}
else
break;
}
}
#endif /* NEW_TTY_DRIVER && DRAIN_OUTPUT */
/* Return the fd from which we are actually getting input. */
#define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
/* Fill the contents of shell_tty_info with the current tty info. */
int
get_tty_state ()
{
int tty;
tty = input_tty ();
if (tty != -1)
{
#if defined (NEW_TTY_DRIVER)
ioctl (tty, TIOCGETP, &shell_tty_info);
ioctl (tty, TIOCGETC, &shell_tchars);
ioctl (tty, TIOCGLTC, &shell_ltchars);
#endif /* NEW_TTY_DRIVER */
#if defined (TERMIO_TTY_DRIVER)
ioctl (tty, TCGETA, &shell_tty_info);
#endif /* TERMIO_TTY_DRIVER */
#if defined (TERMIOS_TTY_DRIVER)
if (tcgetattr (tty, &shell_tty_info) < 0)
{
#if 0
/* Only print an error message if we're really interactive at
this time. */
if (interactive)
sys_error ("[%ld: %d (%d)] tcgetattr", (long)getpid (), shell_level, tty);
#endif
return -1;
}
#endif /* TERMIOS_TTY_DRIVER */
if (check_window_size)
get_new_window_size (0, (int *)0, (int *)0);
}
return 0;
}
/* Make the current tty use the state in shell_tty_info. */
int
set_tty_state ()
{
int tty;
tty = input_tty ();
if (tty != -1)
{
#if defined (NEW_TTY_DRIVER)
# if defined (DRAIN_OUTPUT)
draino (tty, shell_tty_info.sg_ospeed);
# endif /* DRAIN_OUTPUT */
ioctl (tty, TIOCSETN, &shell_tty_info);
ioctl (tty, TIOCSETC, &shell_tchars);
ioctl (tty, TIOCSLTC, &shell_ltchars);
#endif /* NEW_TTY_DRIVER */
#if defined (TERMIO_TTY_DRIVER)
ioctl (tty, TCSETAW, &shell_tty_info);
#endif /* TERMIO_TTY_DRIVER */
#if defined (TERMIOS_TTY_DRIVER)
if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
{
/* Only print an error message if we're really interactive at
this time. */
if (interactive)
sys_error ("[%ld: %d (%d)] tcsetattr", (long)getpid (), shell_level, tty);
return -1;
}
#endif /* TERMIOS_TTY_DRIVER */
}
return 0;
}
/* Given an index into the jobs array JOB, return the PROCESS struct of the last
process in that job's pipeline. This is the one whose exit status
counts. Must be called with SIGCHLD blocked or queued. */
static PROCESS *
find_last_proc (job, block)
int job;
int block;
{
register PROCESS *p;
sigset_t set, oset;
if (block)
BLOCK_CHILD (set, oset);
p = jobs[job]->pipe;
while (p && p->next != jobs[job]->pipe)
p = p->next;
if (block)
UNBLOCK_CHILD (oset);
return (p);
}
static pid_t
find_last_pid (job, block)
int job;
int block;
{
PROCESS *p;
p = find_last_proc (job, block);
/* Possible race condition here. */
return p->pid;
}
/* Wait for a particular child of the shell to finish executing.
This low-level function prints an error message if PID is not
a child of this shell. It returns -1 if it fails, or whatever
wait_for returns otherwise. If the child is not found in the
jobs table, it returns 127. */
int
wait_for_single_pid (pid)
pid_t pid;
{
register PROCESS *child;
sigset_t set, oset;
int r, job;
BLOCK_CHILD (set, oset);
child = find_pipeline (pid, 0, (int *)NULL);
UNBLOCK_CHILD (oset);
if (child == 0)
{
r = bgp_search (pid);
if (r >= 0)
return r;
}
if (child == 0)
{
internal_error (_("wait: pid %ld is not a child of this shell"), (long)pid);
return (127);
}
r = wait_for (pid);
/* POSIX.2: if we just waited for a job, we can remove it from the jobs
table. */
BLOCK_CHILD (set, oset);
job = find_job (pid, 0, NULL);
if (job != NO_JOB && jobs[job] && DEADJOB (job))
jobs[job]->flags |= J_NOTIFIED;
UNBLOCK_CHILD (oset);
/* If running in posix mode, remove the job from the jobs table immediately */
if (posixly_correct)
{
cleanup_dead_jobs ();
bgp_delete (pid);
}
return r;
}
/* Wait for all of the background processes started by this shell to finish. */
void
wait_for_background_pids ()
{
register int i, r, waited_for;
sigset_t set, oset;
pid_t pid;
for (waited_for = 0;;)
{
BLOCK_CHILD (set, oset);
/* find first running job; if none running in foreground, break */
/* XXX could use js.j_firstj and js.j_lastj here */
for (i = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("wait_for_background_pids: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("wait_for_background_pids: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i] && RUNNING (i) && IS_FOREGROUND (i) == 0)
break;
}
if (i == js.j_jobslots)
{
UNBLOCK_CHILD (oset);
break;
}
/* now wait for the last pid in that job. */
pid = find_last_pid (i, 0);
UNBLOCK_CHILD (oset);
QUIT;
errno = 0; /* XXX */
r = wait_for_single_pid (pid);
if (r == -1)
{
/* If we're mistaken about job state, compensate. */
if (errno == ECHILD)
mark_all_jobs_as_dead ();
}
else
waited_for++;
}
/* POSIX.2 says the shell can discard the statuses of all completed jobs if
`wait' is called with no arguments. */
mark_dead_jobs_as_notified (1);
cleanup_dead_jobs ();
bgp_clear ();
}
/* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
#define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER;
static void
restore_sigint_handler ()
{
if (old_sigint_handler != INVALID_SIGNAL_HANDLER)
{
set_signal_handler (SIGINT, old_sigint_handler);
old_sigint_handler = INVALID_SIGNAL_HANDLER;
}
}
static int wait_sigint_received;
/* Handle SIGINT while we are waiting for children in a script to exit.
The `wait' builtin should be interruptible, but all others should be
effectively ignored (i.e. not cause the shell to exit). */
static sighandler
wait_sigint_handler (sig)
int sig;
{
SigHandler *sigint_handler;
if (interrupt_immediately ||
(this_shell_builtin && this_shell_builtin == wait_builtin))
{
last_command_exit_value = EXECUTION_FAILURE;
restore_sigint_handler ();
/* If we got a SIGINT while in `wait', and SIGINT is trapped, do
what POSIX.2 says (see builtins/wait.def for more info). */
if (this_shell_builtin && this_shell_builtin == wait_builtin &&
signal_is_trapped (SIGINT) &&
((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler))
{
interrupt_immediately = 0;
trap_handler (SIGINT); /* set pending_traps[SIGINT] */
wait_signal_received = SIGINT;
longjmp (wait_intr_buf, 1);
}
ADDINTERRUPT;
QUIT;
}
/* XXX - should this be interrupt_state? If it is, the shell will act
as if it got the SIGINT interrupt. */
wait_sigint_received = 1;
/* Otherwise effectively ignore the SIGINT and allow the running job to
be killed. */
SIGRETURN (0);
}
static int
process_exit_signal (status)
WAIT status;
{
return (WIFSIGNALED (status) ? WTERMSIG (status) : 0);
}
static int
process_exit_status (status)
WAIT status;
{
if (WIFSIGNALED (status))
return (128 + WTERMSIG (status));
else if (WIFSTOPPED (status) == 0)
return (WEXITSTATUS (status));
else
return (EXECUTION_SUCCESS);
}
static WAIT
job_signal_status (job)
int job;
{
register PROCESS *p;
WAIT s;
p = jobs[job]->pipe;
do
{
s = p->status;
if (WIFSIGNALED(s) || WIFSTOPPED(s))
break;
p = p->next;
}
while (p != jobs[job]->pipe);
return s;
}
/* Return the exit status of the last process in the pipeline for job JOB.
This is the exit status of the entire job. */
static WAIT
raw_job_exit_status (job)
int job;
{
register PROCESS *p;
int fail;
WAIT ret;
if (pipefail_opt)
{
fail = 0;
p = jobs[job]->pipe;
do
{
if (WSTATUS (p->status) != EXECUTION_SUCCESS)
fail = WSTATUS(p->status);
p = p->next;
}
while (p != jobs[job]->pipe);
WSTATUS (ret) = fail;
return ret;
}
for (p = jobs[job]->pipe; p->next != jobs[job]->pipe; p = p->next)
;
return (p->status);
}
/* Return the exit status of job JOB. This is the exit status of the last
(rightmost) process in the job's pipeline, modified if the job was killed
by a signal or stopped. */
int
job_exit_status (job)
int job;
{
return (process_exit_status (raw_job_exit_status (job)));
}
int
job_exit_signal (job)
int job;
{
return (process_exit_signal (raw_job_exit_status (job)));
}
#define FIND_CHILD(pid, child) \
do \
{ \
child = find_pipeline (pid, 0, (int *)NULL); \
if (child == 0) \
{ \
give_terminal_to (shell_pgrp, 0); \
UNBLOCK_CHILD (oset); \
internal_error (_("wait_for: No record of process %ld"), (long)pid); \
restore_sigint_handler (); \
return (termination_state = 127); \
} \
} \
while (0)
/* Wait for pid (one of our children) to terminate, then
return the termination state. Returns 127 if PID is not found in
the jobs table. Returns -1 if waitchld() returns -1, indicating
that there are no unwaited-for child processes. */
int
wait_for (pid)
pid_t pid;
{
int job, termination_state, r;
WAIT s;
register PROCESS *child;
sigset_t set, oset;
/* In the case that this code is interrupted, and we longjmp () out of it,
we are relying on the code in throw_to_top_level () to restore the
top-level signal mask. */
BLOCK_CHILD (set, oset);
/* Ignore interrupts while waiting for a job run without job control
to finish. We don't want the shell to exit if an interrupt is
received, only if one of the jobs run is killed via SIGINT. If
job control is not set, the job will be run in the same pgrp as
the shell, and the shell will see any signals the job gets. In
fact, we want this set every time the waiting shell and the waited-
for process are in the same process group, including command
substitution. */
/* This is possibly a race condition -- should it go in stop_pipeline? */
wait_sigint_received = 0;
if (job_control == 0 || (subshell_environment&SUBSHELL_COMSUB))
{
old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler);
if (old_sigint_handler == SIG_IGN)
set_signal_handler (SIGINT, old_sigint_handler);
}
termination_state = last_command_exit_value;
if (interactive && job_control == 0)
QUIT;
/* Check for terminating signals and exit the shell if we receive one */
CHECK_TERMSIG;
/* If we say wait_for (), then we have a record of this child somewhere.
If it and none of its peers are running, don't call waitchld(). */
job = NO_JOB;
do
{
FIND_CHILD (pid, child);
/* If this child is part of a job, then we are really waiting for the
job to finish. Otherwise, we are waiting for the child to finish.
We check for JDEAD in case the job state has been set by waitchld
after receipt of a SIGCHLD. */
if (job == NO_JOB)
job = find_job (pid, 0, NULL);
/* waitchld() takes care of setting the state of the job. If the job
has already exited before this is called, sigchld_handler will have
called waitchld and the state will be set to JDEAD. */
if (PRUNNING(child) || (job != NO_JOB && RUNNING (job)))
{
#if defined (WAITPID_BROKEN) /* SCOv4 */
sigset_t suspend_set;
sigemptyset (&suspend_set);
sigsuspend (&suspend_set);
#else /* !WAITPID_BROKEN */
# if defined (MUST_UNBLOCK_CHLD)
struct sigaction act, oact;
sigset_t nullset, chldset;
sigemptyset (&nullset);
sigemptyset (&chldset);
sigprocmask (SIG_SETMASK, &nullset, &chldset);
act.sa_handler = SIG_DFL;
sigemptyset (&act.sa_mask);
sigemptyset (&oact.sa_mask);
act.sa_flags = 0;
sigaction (SIGCHLD, &act, &oact);
# endif
queue_sigchld = 1;
r = waitchld (pid, 1);
# if defined (MUST_UNBLOCK_CHLD)
sigaction (SIGCHLD, &oact, (struct sigaction *)NULL);
sigprocmask (SIG_SETMASK, &chldset, (sigset_t *)NULL);
# endif
queue_sigchld = 0;
if (r == -1 && errno == ECHILD && this_shell_builtin == wait_builtin)
{
termination_state = -1;
goto wait_for_return;
}
/* If child is marked as running, but waitpid() returns -1/ECHILD,
there is something wrong. Somewhere, wait should have returned
that child's pid. Mark the child as not running and the job,
if it exists, as JDEAD. */
if (r == -1 && errno == ECHILD)
{
child->running = PS_DONE;
WSTATUS (child->status) = 0; /* XXX -- can't find true status */
js.c_living = 0; /* no living child processes */
if (job != NO_JOB)
{
jobs[job]->state = JDEAD;
js.c_reaped++;
js.j_ndead++;
}
}
#endif /* WAITPID_BROKEN */
}
/* If the shell is interactive, and job control is disabled, see
if the foreground process has died due to SIGINT and jump out
of the wait loop if it has. waitchld has already restored the
old SIGINT signal handler. */
if (interactive && job_control == 0)
QUIT;
/* Check for terminating signals and exit the shell if we receive one */
CHECK_TERMSIG;
}
while (PRUNNING (child) || (job != NO_JOB && RUNNING (job)));
/* The exit state of the command is either the termination state of the
child, or the termination state of the job. If a job, the status
of the last child in the pipeline is the significant one. If the command
or job was terminated by a signal, note that value also. */
termination_state = (job != NO_JOB) ? job_exit_status (job)
: process_exit_status (child->status);
last_command_exit_signal = (job != NO_JOB) ? job_exit_signal (job)
: process_exit_signal (child->status);
/* XXX */
if ((job != NO_JOB && JOBSTATE (job) == JSTOPPED) || WIFSTOPPED (child->status))
termination_state = 128 + WSTOPSIG (child->status);
if (job == NO_JOB || IS_JOBCONTROL (job))
{
/* XXX - under what circumstances is a job not present in the jobs
table (job == NO_JOB)?
1. command substitution
In the case of command substitution, at least, it's probably not
the right thing to give the terminal to the shell's process group,
even though there is code in subst.c:command_substitute to work
around it.
Things that don't:
$PROMPT_COMMAND execution
process substitution
*/
#if 0
if (job == NO_JOB)
itrace("wait_for: job == NO_JOB, giving the terminal to shell_pgrp (%ld)", (long)shell_pgrp);
#endif
give_terminal_to (shell_pgrp, 0);
}
/* If the command did not exit cleanly, or the job is just
being stopped, then reset the tty state back to what it
was before this command. Reset the tty state and notify
the user of the job termination only if the shell is
interactive. Clean up any dead jobs in either case. */
if (job != NO_JOB)
{
if (interactive_shell && subshell_environment == 0)
{
/* This used to use `child->status'. That's wrong, however, for
pipelines. `child' is the first process in the pipeline. It's
likely that the process we want to check for abnormal termination
or stopping is the last process in the pipeline, especially if
it's long-lived and the first process is short-lived. Since we
know we have a job here, we can check all the processes in this
job's pipeline and see if one of them stopped or terminated due
to a signal. We might want to change this later to just check
the last process in the pipeline. If no process exits due to a
signal, S is left as the status of the last job in the pipeline. */
s = job_signal_status (job);
if (WIFSIGNALED (s) || WIFSTOPPED (s))
{
set_tty_state ();
/* If the current job was stopped or killed by a signal, and
the user has requested it, get a possibly new window size */
if (check_window_size && (job == js.j_current || IS_FOREGROUND (job)))
get_new_window_size (0, (int *)0, (int *)0);
}
else
get_tty_state ();
/* If job control is enabled, the job was started with job
control, the job was the foreground job, and it was killed
by SIGINT, then print a newline to compensate for the kernel
printing the ^C without a trailing newline. */
if (job_control && IS_JOBCONTROL (job) && IS_FOREGROUND (job) &&
WIFSIGNALED (s) && WTERMSIG (s) == SIGINT)
{
/* If SIGINT is not trapped and the shell is in a for, while,
or until loop, act as if the shell received SIGINT as
well, so the loop can be broken. This doesn't call the
SIGINT signal handler; maybe it should. */
if (signal_is_trapped (SIGINT) == 0 && (loop_level || (shell_compatibility_level > 32 && executing_list)))
ADDINTERRUPT;
else
{
putchar ('\n');
fflush (stdout);
}
}
}
else if ((subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PIPE)) && wait_sigint_received)
{
/* If waiting for a job in a subshell started to do command
substitution or to run a pipeline element that consists of
something like a while loop or a for loop, simulate getting
and being killed by the SIGINT to pass the status back to our
parent. */
s = job_signal_status (job);
if (WIFSIGNALED (s) && WTERMSIG (s) == SIGINT && signal_is_trapped (SIGINT) == 0)
{
UNBLOCK_CHILD (oset);
restore_sigint_handler ();
old_sigint_handler = set_signal_handler (SIGINT, SIG_DFL);
if (old_sigint_handler == SIG_IGN)
restore_sigint_handler ();
else
kill (getpid (), SIGINT);
}
}
/* Moved here from set_job_status_and_cleanup, which is in the SIGCHLD
signal handler path */
if (DEADJOB (job) && IS_FOREGROUND (job) /*&& subshell_environment == 0*/)
setjstatus (job);
/* If this job is dead, notify the user of the status. If the shell
is interactive, this will display a message on the terminal. If
the shell is not interactive, make sure we turn on the notify bit
so we don't get an unwanted message about the job's termination,
and so delete_job really clears the slot in the jobs table. */
notify_and_cleanup ();
}
wait_for_return:
UNBLOCK_CHILD (oset);
/* Restore the original SIGINT signal handler before we return. */
restore_sigint_handler ();
return (termination_state);
}
/* Wait for the last process in the pipeline for JOB. Returns whatever
wait_for returns: the last process's termination state or -1 if there
are no unwaited-for child processes or an error occurs. */
int
wait_for_job (job)
int job;
{
pid_t pid;
int r;
sigset_t set, oset;
BLOCK_CHILD(set, oset);
if (JOBSTATE (job) == JSTOPPED)
internal_warning (_("wait_for_job: job %d is stopped"), job+1);
pid = find_last_pid (job, 0);
UNBLOCK_CHILD(oset);
r = wait_for (pid);
/* POSIX.2: we can remove the job from the jobs table if we just waited
for it. */
BLOCK_CHILD (set, oset);
if (job != NO_JOB && jobs[job] && DEADJOB (job))
jobs[job]->flags |= J_NOTIFIED;
UNBLOCK_CHILD (oset);
return r;
}
/* Print info about dead jobs, and then delete them from the list
of known jobs. This does not actually delete jobs when the
shell is not interactive, because the dead jobs are not marked
as notified. */
void
notify_and_cleanup ()
{
if (jobs_list_frozen)
return;
if (interactive || interactive_shell == 0 || sourcelevel)
notify_of_job_status ();
cleanup_dead_jobs ();
}
/* Make dead jobs disappear from the jobs array without notification.
This is used when the shell is not interactive. */
void
reap_dead_jobs ()
{
mark_dead_jobs_as_notified (0);
cleanup_dead_jobs ();
}
/* Return the next closest (chronologically) job to JOB which is in
STATE. STATE can be JSTOPPED, JRUNNING. NO_JOB is returned if
there is no next recent job. */
static int
most_recent_job_in_state (job, state)
int job;
JOB_STATE state;
{
register int i, result;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
for (result = NO_JOB, i = job - 1; i >= 0; i--)
{
if (jobs[i] && (JOBSTATE (i) == state))
{
result = i;
break;
}
}
UNBLOCK_CHILD (oset);
return (result);
}
/* Return the newest *stopped* job older than JOB, or NO_JOB if not
found. */
static int
job_last_stopped (job)
int job;
{
return (most_recent_job_in_state (job, JSTOPPED));
}
/* Return the newest *running* job older than JOB, or NO_JOB if not
found. */
static int
job_last_running (job)
int job;
{
return (most_recent_job_in_state (job, JRUNNING));
}
/* Make JOB be the current job, and make previous be useful. Must be
called with SIGCHLD blocked. */
static void
set_current_job (job)
int job;
{
int candidate;
if (js.j_current != job)
{
js.j_previous = js.j_current;
js.j_current = job;
}
/* First choice for previous job is the old current job. */
if (js.j_previous != js.j_current &&
js.j_previous != NO_JOB &&
jobs[js.j_previous] &&
STOPPED (js.j_previous))
return;
/* Second choice: Newest stopped job that is older than
the current job. */
candidate = NO_JOB;
if (STOPPED (js.j_current))
{
candidate = job_last_stopped (js.j_current);
if (candidate != NO_JOB)
{
js.j_previous = candidate;
return;
}
}
/* If we get here, there is either only one stopped job, in which case it is
the current job and the previous job should be set to the newest running
job, or there are only running jobs and the previous job should be set to
the newest running job older than the current job. We decide on which
alternative to use based on whether or not JOBSTATE(js.j_current) is
JSTOPPED. */
candidate = RUNNING (js.j_current) ? job_last_running (js.j_current)
: job_last_running (js.j_jobslots);
if (candidate != NO_JOB)
{
js.j_previous = candidate;
return;
}
/* There is only a single job, and it is both `+' and `-'. */
js.j_previous = js.j_current;
}
/* Make current_job be something useful, if it isn't already. */
/* Here's the deal: The newest non-running job should be `+', and the
next-newest non-running job should be `-'. If there is only a single
stopped job, the js.j_previous is the newest non-running job. If there
are only running jobs, the newest running job is `+' and the
next-newest running job is `-'. Must be called with SIGCHLD blocked. */
static void
reset_current ()
{
int candidate;
if (js.j_jobslots && js.j_current != NO_JOB && jobs[js.j_current] && STOPPED (js.j_current))
candidate = js.j_current;
else
{
candidate = NO_JOB;
/* First choice: the previous job. */
if (js.j_previous != NO_JOB && jobs[js.j_previous] && STOPPED (js.j_previous))
candidate = js.j_previous;
/* Second choice: the most recently stopped job. */
if (candidate == NO_JOB)
candidate = job_last_stopped (js.j_jobslots);
/* Third choice: the newest running job. */
if (candidate == NO_JOB)
candidate = job_last_running (js.j_jobslots);
}
/* If we found a job to use, then use it. Otherwise, there
are no jobs period. */
if (candidate != NO_JOB)
set_current_job (candidate);
else
js.j_current = js.j_previous = NO_JOB;
}
/* Set up the job structures so we know the job and its processes are
all running. */
static void
set_job_running (job)
int job;
{
register PROCESS *p;
/* Each member of the pipeline is now running. */
p = jobs[job]->pipe;
do
{
if (WIFSTOPPED (p->status))
p->running = PS_RUNNING; /* XXX - could be PS_STOPPED */
p = p->next;
}
while (p != jobs[job]->pipe);
/* This means that the job is running. */
JOBSTATE (job) = JRUNNING;
}
/* Start a job. FOREGROUND if non-zero says to do that. Otherwise,
start the job in the background. JOB is a zero-based index into
JOBS. Returns -1 if it is unable to start a job, and the return
status of the job otherwise. */
int
start_job (job, foreground)
int job, foreground;
{
register PROCESS *p;
int already_running;
sigset_t set, oset;
char *wd, *s;
static TTYSTRUCT save_stty;
BLOCK_CHILD (set, oset);
if (DEADJOB (job))
{
internal_error (_("%s: job has terminated"), this_command_name);
UNBLOCK_CHILD (oset);
return (-1);
}
already_running = RUNNING (job);
if (foreground == 0 && already_running)
{
internal_error (_("%s: job %d already in background"), this_command_name, job + 1);
UNBLOCK_CHILD (oset);
return (0); /* XPG6/SUSv3 says this is not an error */
}
wd = current_working_directory ();
/* You don't know about the state of this job. Do you? */
jobs[job]->flags &= ~J_NOTIFIED;
if (foreground)
{
set_current_job (job);
jobs[job]->flags |= J_FOREGROUND;
}
/* Tell the outside world what we're doing. */
p = jobs[job]->pipe;
if (foreground == 0)
{
/* POSIX.2 says `bg' doesn't give any indication about current or
previous job. */
if (posixly_correct == 0)
s = (job == js.j_current) ? "+ ": ((job == js.j_previous) ? "- " : " ");
else
s = " ";
printf ("[%d]%s", job + 1, s);
}
do
{
printf ("%s%s",
p->command ? p->command : "",
p->next != jobs[job]->pipe? " | " : "");
p = p->next;
}
while (p != jobs[job]->pipe);
if (foreground == 0)
printf (" &");
if (strcmp (wd, jobs[job]->wd) != 0)
printf (" (wd: %s)", polite_directory_format (jobs[job]->wd));
printf ("\n");
/* Run the job. */
if (already_running == 0)
set_job_running (job);
/* Save the tty settings before we start the job in the foreground. */
if (foreground)
{
get_tty_state ();
save_stty = shell_tty_info;
/* Give the terminal to this job. */
if (IS_JOBCONTROL (job))
give_terminal_to (jobs[job]->pgrp, 0);
}
else
jobs[job]->flags &= ~J_FOREGROUND;
/* If the job is already running, then don't bother jump-starting it. */
if (already_running == 0)
{
jobs[job]->flags |= J_NOTIFIED;
killpg (jobs[job]->pgrp, SIGCONT);
}
if (foreground)
{
pid_t pid;
int st;
pid = find_last_pid (job, 0);
UNBLOCK_CHILD (oset);
st = wait_for (pid);
shell_tty_info = save_stty;
set_tty_state ();
return (st);
}
else
{
reset_current ();
UNBLOCK_CHILD (oset);
return (0);
}
}
/* Give PID SIGNAL. This determines what job the pid belongs to (if any).
If PID does belong to a job, and the job is stopped, then CONTinue the
job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
then kill the process group associated with PID. */
int
kill_pid (pid, sig, group)
pid_t pid;
int sig, group;
{
register PROCESS *p;
int job, result, negative;
sigset_t set, oset;
if (pid < -1)
{
pid = -pid;
group = negative = 1;
}
else
negative = 0;
result = EXECUTION_SUCCESS;
if (group)
{
BLOCK_CHILD (set, oset);
p = find_pipeline (pid, 0, &job);
if (job != NO_JOB)
{
jobs[job]->flags &= ~J_NOTIFIED;
/* Kill process in backquotes or one started without job control? */
/* If we're passed a pid < -1, just call killpg and see what happens */
if (negative && jobs[job]->pgrp == shell_pgrp)
result = killpg (pid, sig);
/* If we're killing using job control notification, for example,
without job control active, we have to do things ourselves. */
else if (jobs[job]->pgrp == shell_pgrp)
{
p = jobs[job]->pipe;
do
{
if (PALIVE (p) == 0)
continue; /* avoid pid recycling problem */
kill (p->pid, sig);
if (PEXITED (p) && (sig == SIGTERM || sig == SIGHUP))
kill (p->pid, SIGCONT);
p = p->next;
}
while (p != jobs[job]->pipe);
}
else
{
result = killpg (jobs[job]->pgrp, sig);
if (p && STOPPED (job) && (sig == SIGTERM || sig == SIGHUP))
killpg (jobs[job]->pgrp, SIGCONT);
/* If we're continuing a stopped job via kill rather than bg or
fg, emulate the `bg' behavior. */
if (p && STOPPED (job) && (sig == SIGCONT))
{
set_job_running (job);
jobs[job]->flags &= ~J_FOREGROUND;
jobs[job]->flags |= J_NOTIFIED;
}
}
}
else
result = killpg (pid, sig);
UNBLOCK_CHILD (oset);
}
else
result = kill (pid, sig);
return (result);
}
/* sigchld_handler () flushes at least one of the children that we are
waiting for. It gets run when we have gotten a SIGCHLD signal. */
static sighandler
sigchld_handler (sig)
int sig;
{
int n, oerrno;
oerrno = errno;
REINSTALL_SIGCHLD_HANDLER;
sigchld++;
n = 0;
if (queue_sigchld == 0)
n = waitchld (-1, 0);
errno = oerrno;
SIGRETURN (n);
}
/* waitchld() reaps dead or stopped children. It's called by wait_for and
sigchld_handler, and runs until there aren't any children terminating any
more.
If BLOCK is 1, this is to be a blocking wait for a single child, although
an arriving SIGCHLD could cause the wait to be non-blocking. It returns
the number of children reaped, or -1 if there are no unwaited-for child
processes. */
static int
waitchld (wpid, block)
pid_t wpid;
int block;
{
WAIT status;
PROCESS *child;
pid_t pid;
int call_set_current, last_stopped_job, job, children_exited, waitpid_flags;
static int wcontinued = WCONTINUED; /* run-time fix for glibc problem */
call_set_current = children_exited = 0;
last_stopped_job = NO_JOB;
do
{
/* We don't want to be notified about jobs stopping if job control
is not active. XXX - was interactive_shell instead of job_control */
waitpid_flags = (job_control && subshell_environment == 0)
? (WUNTRACED|wcontinued)
: 0;
if (sigchld || block == 0)
waitpid_flags |= WNOHANG;
/* Check for terminating signals and exit the shell if we receive one */
CHECK_TERMSIG;
if (block == 1 && queue_sigchld == 0 && (waitpid_flags & WNOHANG) == 0)
{
internal_warning (_("waitchld: turning on WNOHANG to avoid indefinite block"));
waitpid_flags |= WNOHANG;
}
pid = WAITPID (-1, &status, waitpid_flags);
/* WCONTINUED may be rejected by waitpid as invalid even when defined */
if (wcontinued && pid < 0 && errno == EINVAL)
{
wcontinued = 0;
continue; /* jump back to the test and retry without WCONTINUED */
}
/* The check for WNOHANG is to make sure we decrement sigchld only
if it was non-zero before we called waitpid. */
if (sigchld > 0 && (waitpid_flags & WNOHANG))
sigchld--;
/* If waitpid returns -1 with errno == ECHILD, there are no more
unwaited-for child processes of this shell. */
if (pid < 0 && errno == ECHILD)
{
if (children_exited == 0)
return -1;
else
break;
}
/* If waitpid returns 0, there are running children. If it returns -1,
the only other error POSIX says it can return is EINTR. */
CHECK_TERMSIG;
if (pid <= 0)
continue; /* jumps right to the test */
/* children_exited is used to run traps on SIGCHLD. We don't want to
run the trap if a process is just being continued. */
if (WIFCONTINUED(status) == 0)
{
children_exited++;
js.c_living--;
}
/* Locate our PROCESS for this pid. */
child = find_process (pid, 1, &job); /* want living procs only */
#if defined (COPROCESS_SUPPORT)
coproc_pidchk (pid, status);
#endif
/* It is not an error to have a child terminate that we did
not have a record of. This child could have been part of
a pipeline in backquote substitution. Even so, I'm not
sure child is ever non-zero. */
if (child == 0)
{
if (WIFEXITED (status) || WIFSIGNALED (status))
js.c_reaped++;
continue;
}
/* Remember status, and whether or not the process is running. */
child->status = status;
child->running = WIFCONTINUED(status) ? PS_RUNNING : PS_DONE;
if (PEXITED (child))
{
js.c_totreaped++;
if (job != NO_JOB)
js.c_reaped++;
}
if (job == NO_JOB)
continue;
call_set_current += set_job_status_and_cleanup (job);
if (STOPPED (job))
last_stopped_job = job;
else if (DEADJOB (job) && last_stopped_job == job)
last_stopped_job = NO_JOB;
}
while ((sigchld || block == 0) && pid > (pid_t)0);
/* If a job was running and became stopped, then set the current
job. Otherwise, don't change a thing. */
if (call_set_current)
{
if (last_stopped_job != NO_JOB)
set_current_job (last_stopped_job);
else
reset_current ();
}
/* Call a SIGCHLD trap handler for each child that exits, if one is set. */
if (job_control && signal_is_trapped (SIGCHLD) && children_exited &&
trap_list[SIGCHLD] != (char *)IGNORE_SIG)
{
if (posixly_correct && this_shell_builtin && this_shell_builtin == wait_builtin)
{
interrupt_immediately = 0;
trap_handler (SIGCHLD); /* set pending_traps[SIGCHLD] */
wait_signal_received = SIGCHLD;
longjmp (wait_intr_buf, 1);
}
run_sigchld_trap (children_exited);
}
/* We have successfully recorded the useful information about this process
that has just changed state. If we notify asynchronously, and the job
that this process belongs to is no longer running, then notify the user
of that fact now. */
if (asynchronous_notification && interactive)
notify_of_job_status ();
return (children_exited);
}
/* Set the status of JOB and perform any necessary cleanup if the job is
marked as JDEAD.
Currently, the cleanup activity is restricted to handling any SIGINT
received while waiting for a foreground job to finish. */
static int
set_job_status_and_cleanup (job)
int job;
{
PROCESS *child;
int tstatus, job_state, any_stopped, any_tstped, call_set_current;
SigHandler *temp_handler;
child = jobs[job]->pipe;
jobs[job]->flags &= ~J_NOTIFIED;
call_set_current = 0;
/*
* COMPUTE JOB STATUS
*/
/* If all children are not running, but any of them is stopped, then
the job is stopped, not dead. */
job_state = any_stopped = any_tstped = 0;
do
{
job_state |= PRUNNING (child);
#if 0
if (PEXITED (child) && (WIFSTOPPED (child->status)))
#else
/* Only checking for WIFSTOPPED now, not for PS_DONE */
if (PSTOPPED (child))
#endif
{
any_stopped = 1;
any_tstped |= interactive && job_control &&
(WSTOPSIG (child->status) == SIGTSTP);
}
child = child->next;
}
while (child != jobs[job]->pipe);
/* If job_state != 0, the job is still running, so don't bother with
setting the process exit status and job state unless we're
transitioning from stopped to running. */
if (job_state != 0 && JOBSTATE(job) != JSTOPPED)
return 0;
/*
* SET JOB STATUS
*/
/* The job is either stopped or dead. Set the state of the job accordingly. */
if (any_stopped)
{
jobs[job]->state = JSTOPPED;
jobs[job]->flags &= ~J_FOREGROUND;
call_set_current++;
/* Suspending a job with SIGTSTP breaks all active loops. */
if (any_tstped && loop_level)
breaking = loop_level;
}
else if (job_state != 0) /* was stopped, now running */
{
jobs[job]->state = JRUNNING;
call_set_current++;
}
else
{
jobs[job]->state = JDEAD;
js.j_ndead++;
#if 0
if (IS_FOREGROUND (job))
setjstatus (job);
#endif
/* If this job has a cleanup function associated with it, call it
with `cleanarg' as the single argument, then set the function
pointer to NULL so it is not inadvertently called twice. The
cleanup function is responsible for deallocating cleanarg. */
if (jobs[job]->j_cleanup)
{
(*jobs[job]->j_cleanup) (jobs[job]->cleanarg);
jobs[job]->j_cleanup = (sh_vptrfunc_t *)NULL;
}
}
/*
* CLEANUP
*
* Currently, we just do special things if we got a SIGINT while waiting
* for a foreground job to complete
*/
if (JOBSTATE (job) == JDEAD)
{
/* If we're running a shell script and we get a SIGINT with a
SIGINT trap handler, but the foreground job handles it and
does not exit due to SIGINT, run the trap handler but do not
otherwise act as if we got the interrupt. */
if (wait_sigint_received && interactive_shell == 0 &&
WIFSIGNALED (child->status) == 0 && IS_FOREGROUND (job) &&
signal_is_trapped (SIGINT))
{
int old_frozen;
wait_sigint_received = 0;
last_command_exit_value = process_exit_status (child->status);
old_frozen = jobs_list_frozen;
jobs_list_frozen = 1;
tstatus = maybe_call_trap_handler (SIGINT);
jobs_list_frozen = old_frozen;
}
/* If the foreground job is killed by SIGINT when job control is not
active, we need to perform some special handling.
The check of wait_sigint_received is a way to determine if the
SIGINT came from the keyboard (in which case the shell has already
seen it, and wait_sigint_received is non-zero, because keyboard
signals are sent to process groups) or via kill(2) to the foreground
process by another process (or itself). If the shell did receive the
SIGINT, it needs to perform normal SIGINT processing. */
else if (wait_sigint_received && (WTERMSIG (child->status) == SIGINT) &&
IS_FOREGROUND (job) && IS_JOBCONTROL (job) == 0)
{
int old_frozen;
wait_sigint_received = 0;
/* If SIGINT is trapped, set the exit status so that the trap
handler can see it. */
if (signal_is_trapped (SIGINT))
last_command_exit_value = process_exit_status (child->status);
/* If the signal is trapped, let the trap handler get it no matter
what and simply return if the trap handler returns.
maybe_call_trap_handler() may cause dead jobs to be removed from
the job table because of a call to execute_command. We work
around this by setting JOBS_LIST_FROZEN. */
old_frozen = jobs_list_frozen;
jobs_list_frozen = 1;
tstatus = maybe_call_trap_handler (SIGINT);
jobs_list_frozen = old_frozen;
if (tstatus == 0 && old_sigint_handler != INVALID_SIGNAL_HANDLER)
{
/* wait_sigint_handler () has already seen SIGINT and
allowed the wait builtin to jump out. We need to
call the original SIGINT handler, if necessary. If
the original handler is SIG_DFL, we need to resend
the signal to ourselves. */
temp_handler = old_sigint_handler;
/* Bogus. If we've reset the signal handler as the result
of a trap caught on SIGINT, then old_sigint_handler
will point to trap_handler, which now knows nothing about
SIGINT (if we reset the sighandler to the default).
In this case, we have to fix things up. What a crock. */
if (temp_handler == trap_handler && signal_is_trapped (SIGINT) == 0)
temp_handler = trap_to_sighandler (SIGINT);
restore_sigint_handler ();
if (temp_handler == SIG_DFL)
termsig_handler (SIGINT);
else if (temp_handler != SIG_IGN)
(*temp_handler) (SIGINT);
}
}
}
return call_set_current;
}
/* Build the array of values for the $PIPESTATUS variable from the set of
exit statuses of all processes in the job J. */
static void
setjstatus (j)
int j;
{
#if defined (ARRAY_VARS)
register int i;
register PROCESS *p;
for (i = 1, p = jobs[j]->pipe; p->next != jobs[j]->pipe; p = p->next, i++)
;
i++;
if (statsize < i)
{
pstatuses = (int *)xrealloc (pstatuses, i * sizeof (int));
statsize = i;
}
i = 0;
p = jobs[j]->pipe;
do
{
pstatuses[i++] = process_exit_status (p->status);
p = p->next;
}
while (p != jobs[j]->pipe);
pstatuses[i] = -1; /* sentinel */
set_pipestatus_array (pstatuses, i);
#endif
}
void
run_sigchld_trap (nchild)
int nchild;
{
char *trap_command;
int i;
/* Turn off the trap list during the call to parse_and_execute ()
to avoid potentially infinite recursive calls. Preserve the
values of last_command_exit_value, last_made_pid, and the_pipeline
around the execution of the trap commands. */
trap_command = savestring (trap_list[SIGCHLD]);
begin_unwind_frame ("SIGCHLD trap");
unwind_protect_int (last_command_exit_value);
unwind_protect_int (last_command_exit_signal);
unwind_protect_var (last_made_pid);
unwind_protect_int (interrupt_immediately);
unwind_protect_int (jobs_list_frozen);
unwind_protect_pointer (the_pipeline);
unwind_protect_pointer (subst_assign_varlist);
/* We have to add the commands this way because they will be run
in reverse order of adding. We don't want maybe_set_sigchld_trap ()
to reference freed memory. */
add_unwind_protect (xfree, trap_command);
add_unwind_protect (maybe_set_sigchld_trap, trap_command);
subst_assign_varlist = (WORD_LIST *)NULL;
the_pipeline = (PROCESS *)NULL;
set_impossible_sigchld_trap ();
jobs_list_frozen = 1;
for (i = 0; i < nchild; i++)
{
interrupt_immediately = 1;
parse_and_execute (savestring (trap_command), "trap", SEVAL_NOHIST|SEVAL_RESETLINE);
}
run_unwind_frame ("SIGCHLD trap");
}
/* Function to call when you want to notify people of changes
in job status. This prints out all jobs which are pending
notification to stderr, and marks those printed as already
notified, thus making them candidates for cleanup. */
static void
notify_of_job_status ()
{
register int job, termsig;
char *dir;
sigset_t set, oset;
WAIT s;
if (jobs == 0 || js.j_jobslots == 0)
return;
if (old_ttou != 0)
{
sigemptyset (&set);
sigaddset (&set, SIGCHLD);
sigaddset (&set, SIGTTOU);
sigemptyset (&oset);
sigprocmask (SIG_BLOCK, &set, &oset);
}
else
queue_sigchld++;
/* XXX could use js.j_firstj here */
for (job = 0, dir = (char *)NULL; job < js.j_jobslots; job++)
{
if (jobs[job] && IS_NOTIFIED (job) == 0)
{
s = raw_job_exit_status (job);
termsig = WTERMSIG (s);
/* POSIX.2 says we have to hang onto the statuses of at most the
last CHILD_MAX background processes if the shell is running a
script. If the shell is running a script, either from a file
or standard input, don't print anything unless the job was
killed by a signal. */
if (startup_state == 0 && WIFSIGNALED (s) == 0 &&
((DEADJOB (job) && IS_FOREGROUND (job) == 0) || STOPPED (job)))
continue;
#if 0
/* If job control is disabled, don't print the status messages.
Mark dead jobs as notified so that they get cleaned up. If
startup_state == 2, we were started to run `-c command', so
don't print anything. */
if ((job_control == 0 && interactive_shell) || startup_state == 2)
#else
/* If job control is disabled, don't print the status messages.
Mark dead jobs as notified so that they get cleaned up. If
startup_state == 2 and subshell_environment has the
SUBSHELL_COMSUB bit turned on, we were started to run a command
substitution, so don't print anything. */
if ((job_control == 0 && interactive_shell) ||
(startup_state == 2 && (subshell_environment & SUBSHELL_COMSUB)))
#endif
{
/* POSIX.2 compatibility: if the shell is not interactive,
hang onto the job corresponding to the last asynchronous
pid until the user has been notified of its status or does
a `wait'. */
if (DEADJOB (job) && (interactive_shell || (find_last_pid (job, 0) != last_asynchronous_pid)))
jobs[job]->flags |= J_NOTIFIED;
continue;
}
/* Print info on jobs that are running in the background,
and on foreground jobs that were killed by anything
except SIGINT (and possibly SIGPIPE). */
switch (JOBSTATE (job))
{
case JDEAD:
if (interactive_shell == 0 && termsig && WIFSIGNALED (s) &&
termsig != SIGINT &&
#if defined (DONT_REPORT_SIGPIPE)
termsig != SIGPIPE &&
#endif
signal_is_trapped (termsig) == 0)
{
/* Don't print `0' for a line number. */
fprintf (stderr, _("%s: line %d: "), get_name_for_error (), (line_number == 0) ? 1 : line_number);
pretty_print_job (job, JLIST_NONINTERACTIVE, stderr);
}
else if (IS_FOREGROUND (job))
{
#if !defined (DONT_REPORT_SIGPIPE)
if (termsig && WIFSIGNALED (s) && termsig != SIGINT)
#else
if (termsig && WIFSIGNALED (s) && termsig != SIGINT && termsig != SIGPIPE)
#endif
{
fprintf (stderr, "%s", j_strsignal (termsig));
if (WIFCORED (s))
fprintf (stderr, _(" (core dumped)"));
fprintf (stderr, "\n");
}
}
else if (job_control) /* XXX job control test added */
{
if (dir == 0)
dir = current_working_directory ();
pretty_print_job (job, JLIST_STANDARD, stderr);
if (dir && strcmp (dir, jobs[job]->wd) != 0)
fprintf (stderr,
_("(wd now: %s)\n"), polite_directory_format (dir));
}
jobs[job]->flags |= J_NOTIFIED;
break;
case JSTOPPED:
fprintf (stderr, "\n");
if (dir == 0)
dir = current_working_directory ();
pretty_print_job (job, JLIST_STANDARD, stderr);
if (dir && (strcmp (dir, jobs[job]->wd) != 0))
fprintf (stderr,
_("(wd now: %s)\n"), polite_directory_format (dir));
jobs[job]->flags |= J_NOTIFIED;
break;
case JRUNNING:
case JMIXED:
break;
default:
programming_error ("notify_of_job_status");
}
}
}
if (old_ttou != 0)
sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
else
queue_sigchld--;
}
/* Initialize the job control mechanism, and set up the tty stuff. */
int
initialize_job_control (force)
int force;
{
pid_t t;
int t_errno;
t_errno = -1;
shell_pgrp = getpgid (0);
if (shell_pgrp == -1)
{
sys_error (_("initialize_job_control: getpgrp failed"));
exit (1);
}
/* We can only have job control if we are interactive. */
if (interactive == 0)
{
job_control = 0;
original_pgrp = NO_PID;
shell_tty = fileno (stderr);
}
else
{
shell_tty = -1;
/* If forced_interactive is set, we skip the normal check that stderr
is attached to a tty, so we need to check here. If it's not, we
need to see whether we have a controlling tty by opening /dev/tty,
since trying to use job control tty pgrp manipulations on a non-tty
is going to fail. */
if (forced_interactive && isatty (fileno (stderr)) == 0)
shell_tty = open ("/dev/tty", O_RDWR|O_NONBLOCK);
/* Get our controlling terminal. If job_control is set, or
interactive is set, then this is an interactive shell no
matter where fd 2 is directed. */
if (shell_tty == -1)
shell_tty = dup (fileno (stderr)); /* fd 2 */
shell_tty = move_to_high_fd (shell_tty, 1, -1);
/* Compensate for a bug in systems that compiled the BSD
rlogind with DEBUG defined, like NeXT and Alliant. */
if (shell_pgrp == 0)
{
shell_pgrp = getpid ();
setpgid (0, shell_pgrp);
tcsetpgrp (shell_tty, shell_pgrp);
}
while ((terminal_pgrp = tcgetpgrp (shell_tty)) != -1)
{
if (shell_pgrp != terminal_pgrp)
{
SigHandler *ottin;
ottin = set_signal_handler(SIGTTIN, SIG_DFL);
kill (0, SIGTTIN);
set_signal_handler (SIGTTIN, ottin);
continue;
}
break;
}
if (terminal_pgrp == -1)
t_errno = errno;
/* Make sure that we are using the new line discipline. */
if (set_new_line_discipline (shell_tty) < 0)
{
sys_error (_("initialize_job_control: line discipline"));
job_control = 0;
}
else
{
original_pgrp = shell_pgrp;
shell_pgrp = getpid ();
if ((original_pgrp != shell_pgrp) && (setpgid (0, shell_pgrp) < 0))
{
sys_error (_("initialize_job_control: setpgid"));
shell_pgrp = original_pgrp;
}
job_control = 1;
/* If (and only if) we just set our process group to our pid,
thereby becoming a process group leader, and the terminal
is not in the same process group as our (new) process group,
then set the terminal's process group to our (new) process
group. If that fails, set our process group back to what it
was originally (so we can still read from the terminal) and
turn off job control. */
if (shell_pgrp != original_pgrp && shell_pgrp != terminal_pgrp)
{
if (give_terminal_to (shell_pgrp, 0) < 0)
{
t_errno = errno;
setpgid (0, original_pgrp);
shell_pgrp = original_pgrp;
job_control = 0;
}
}
if (job_control && ((t = tcgetpgrp (shell_tty)) == -1 || t != shell_pgrp))
{
if (t_errno != -1)
errno = t_errno;
sys_error (_("cannot set terminal process group (%d)"), t);
job_control = 0;
}
}
if (job_control == 0)
internal_error (_("no job control in this shell"));
}
if (shell_tty != fileno (stderr))
SET_CLOSE_ON_EXEC (shell_tty);
set_signal_handler (SIGCHLD, sigchld_handler);
change_flag ('m', job_control ? '-' : '+');
if (interactive)
get_tty_state ();
if (js.c_childmax < 0)
js.c_childmax = getmaxchild ();
if (js.c_childmax < 0)
js.c_childmax = DEFAULT_CHILD_MAX;
return job_control;
}
#ifdef DEBUG
void
debug_print_pgrps ()
{
itrace("original_pgrp = %ld shell_pgrp = %ld terminal_pgrp = %ld",
(long)original_pgrp, (long)shell_pgrp, (long)terminal_pgrp);
itrace("tcgetpgrp(%d) -> %ld, getpgid(0) -> %ld",
shell_tty, (long)tcgetpgrp (shell_tty), (long)getpgid(0));
}
#endif
/* Set the line discipline to the best this system has to offer.
Return -1 if this is not possible. */
static int
set_new_line_discipline (tty)
int tty;
{
#if defined (NEW_TTY_DRIVER)
int ldisc;
if (ioctl (tty, TIOCGETD, &ldisc) < 0)
return (-1);
if (ldisc != NTTYDISC)
{
ldisc = NTTYDISC;
if (ioctl (tty, TIOCSETD, &ldisc) < 0)
return (-1);
}
return (0);
#endif /* NEW_TTY_DRIVER */
#if defined (TERMIO_TTY_DRIVER)
# if defined (TERMIO_LDISC) && (NTTYDISC)
if (ioctl (tty, TCGETA, &shell_tty_info) < 0)
return (-1);
if (shell_tty_info.c_line != NTTYDISC)
{
shell_tty_info.c_line = NTTYDISC;
if (ioctl (tty, TCSETAW, &shell_tty_info) < 0)
return (-1);
}
# endif /* TERMIO_LDISC && NTTYDISC */
return (0);
#endif /* TERMIO_TTY_DRIVER */
#if defined (TERMIOS_TTY_DRIVER)
# if defined (TERMIOS_LDISC) && defined (NTTYDISC)
if (tcgetattr (tty, &shell_tty_info) < 0)
return (-1);
if (shell_tty_info.c_line != NTTYDISC)
{
shell_tty_info.c_line = NTTYDISC;
if (tcsetattr (tty, TCSADRAIN, &shell_tty_info) < 0)
return (-1);
}
# endif /* TERMIOS_LDISC && NTTYDISC */
return (0);
#endif /* TERMIOS_TTY_DRIVER */
#if !defined (NEW_TTY_DRIVER) && !defined (TERMIO_TTY_DRIVER) && !defined (TERMIOS_TTY_DRIVER)
return (-1);
#endif
}
/* Setup this shell to handle C-C, etc. */
void
initialize_job_signals ()
{
if (interactive)
{
set_signal_handler (SIGINT, sigint_sighandler);
set_signal_handler (SIGTSTP, SIG_IGN);
set_signal_handler (SIGTTOU, SIG_IGN);
set_signal_handler (SIGTTIN, SIG_IGN);
}
else if (job_control)
{
old_tstp = set_signal_handler (SIGTSTP, sigstop_sighandler);
old_ttin = set_signal_handler (SIGTTIN, sigstop_sighandler);
old_ttou = set_signal_handler (SIGTTOU, sigstop_sighandler);
}
/* Leave these things alone for non-interactive shells without job
control. */
}
/* Here we handle CONT signals. */
static sighandler
sigcont_sighandler (sig)
int sig;
{
initialize_job_signals ();
set_signal_handler (SIGCONT, old_cont);
kill (getpid (), SIGCONT);
SIGRETURN (0);
}
/* Here we handle stop signals while we are running not as a login shell. */
static sighandler
sigstop_sighandler (sig)
int sig;
{
set_signal_handler (SIGTSTP, old_tstp);
set_signal_handler (SIGTTOU, old_ttou);
set_signal_handler (SIGTTIN, old_ttin);
old_cont = set_signal_handler (SIGCONT, sigcont_sighandler);
give_terminal_to (shell_pgrp, 0);
kill (getpid (), sig);
SIGRETURN (0);
}
/* Give the terminal to PGRP. */
int
give_terminal_to (pgrp, force)
pid_t pgrp;
int force;
{
sigset_t set, oset;
int r, e;
r = 0;
if (job_control || force)
{
sigemptyset (&set);
sigaddset (&set, SIGTTOU);
sigaddset (&set, SIGTTIN);
sigaddset (&set, SIGTSTP);
sigaddset (&set, SIGCHLD);
sigemptyset (&oset);
sigprocmask (SIG_BLOCK, &set, &oset);
if (tcsetpgrp (shell_tty, pgrp) < 0)
{
/* Maybe we should print an error message? */
#if 0
sys_error ("tcsetpgrp(%d) failed: pid %ld to pgrp %ld",
shell_tty, (long)getpid(), (long)pgrp);
#endif
r = -1;
e = errno;
}
else
terminal_pgrp = pgrp;
sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
}
if (r == -1)
errno = e;
return r;
}
/* Give terminal to NPGRP iff it's currently owned by OPGRP. FLAGS are the
flags to pass to give_terminal_to(). */
static int
maybe_give_terminal_to (opgrp, npgrp, flags)
pid_t opgrp, npgrp;
int flags;
{
int tpgrp;
tpgrp = tcgetpgrp (shell_tty);
if (tpgrp < 0 && errno == ENOTTY)
return -1;
if (tpgrp == npgrp)
{
terminal_pgrp = npgrp;
return 0;
}
else if (tpgrp != opgrp)
{
#if defined (DEBUG)
internal_warning ("maybe_give_terminal_to: terminal pgrp == %d shell pgrp = %d new pgrp = %d", tpgrp, opgrp, npgrp);
#endif
return -1;
}
else
return (give_terminal_to (npgrp, flags));
}
/* Clear out any jobs in the job array. This is intended to be used by
children of the shell, who should not have any job structures as baggage
when they start executing (forking subshells for parenthesized execution
and functions with pipes are the two that spring to mind). If RUNNING_ONLY
is nonzero, only running jobs are removed from the table. */
void
delete_all_jobs (running_only)
int running_only;
{
register int i;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
/* XXX - need to set j_lastj, j_firstj appropriately if running_only != 0. */
if (js.j_jobslots)
{
js.j_current = js.j_previous = NO_JOB;
/* XXX could use js.j_firstj here */
for (i = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("delete_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("delete_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
delete_job (i, DEL_WARNSTOPPED);
}
if (running_only == 0)
{
free ((char *)jobs);
js.j_jobslots = 0;
js.j_firstj = js.j_lastj = js.j_njobs = 0;
}
}
if (running_only == 0)
bgp_clear ();
UNBLOCK_CHILD (oset);
}
/* Mark all jobs in the job array so that they don't get a SIGHUP when the
shell gets one. If RUNNING_ONLY is nonzero, mark only running jobs. */
void
nohup_all_jobs (running_only)
int running_only;
{
register int i;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
if (js.j_jobslots)
{
/* XXX could use js.j_firstj here */
for (i = 0; i < js.j_jobslots; i++)
if (jobs[i] && (running_only == 0 || (running_only && RUNNING(i))))
nohup_job (i);
}
UNBLOCK_CHILD (oset);
}
int
count_all_jobs ()
{
int i, n;
sigset_t set, oset;
/* This really counts all non-dead jobs. */
BLOCK_CHILD (set, oset);
/* XXX could use js.j_firstj here */
for (i = n = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("count_all_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("count_all_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i] && DEADJOB(i) == 0)
n++;
}
UNBLOCK_CHILD (oset);
return n;
}
static void
mark_all_jobs_as_dead ()
{
register int i;
sigset_t set, oset;
if (js.j_jobslots == 0)
return;
BLOCK_CHILD (set, oset);
/* XXX could use js.j_firstj here */
for (i = 0; i < js.j_jobslots; i++)
if (jobs[i])
{
jobs[i]->state = JDEAD;
js.j_ndead++;
}
UNBLOCK_CHILD (oset);
}
/* Mark all dead jobs as notified, so delete_job () cleans them out
of the job table properly. POSIX.2 says we need to save the
status of the last CHILD_MAX jobs, so we count the number of dead
jobs and mark only enough as notified to save CHILD_MAX statuses. */
static void
mark_dead_jobs_as_notified (force)
int force;
{
register int i, ndead, ndeadproc;
sigset_t set, oset;
if (js.j_jobslots == 0)
return;
BLOCK_CHILD (set, oset);
/* If FORCE is non-zero, we don't have to keep CHILD_MAX statuses
around; just run through the array. */
if (force)
{
/* XXX could use js.j_firstj here */
for (i = 0; i < js.j_jobslots; i++)
{
if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
jobs[i]->flags |= J_NOTIFIED;
}
UNBLOCK_CHILD (oset);
return;
}
/* Mark enough dead jobs as notified to keep CHILD_MAX processes left in the
array with the corresponding not marked as notified. This is a better
way to avoid pid aliasing and reuse problems than keeping the POSIX-
mandated CHILD_MAX jobs around. delete_job() takes care of keeping the
bgpids list regulated. */
/* Count the number of dead jobs */
/* XXX could use js.j_firstj here */
for (i = ndead = ndeadproc = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i] && DEADJOB (i))
{
ndead++;
ndeadproc += processes_in_job (i);
}
}
#ifdef DEBUG
if (ndeadproc != js.c_reaped)
itrace("mark_dead_jobs_as_notified: ndeadproc (%d) != js.c_reaped (%d)", ndeadproc, js.c_reaped);
if (ndead != js.j_ndead)
itrace("mark_dead_jobs_as_notified: ndead (%d) != js.j_ndead (%d)", ndead, js.j_ndead);
#endif
if (js.c_childmax < 0)
js.c_childmax = getmaxchild ();
if (js.c_childmax < 0)
js.c_childmax = DEFAULT_CHILD_MAX;
/* Don't do anything if the number of dead processes is less than CHILD_MAX
and we're not forcing a cleanup. */
if (ndeadproc <= js.c_childmax)
{
UNBLOCK_CHILD (oset);
return;
}
#if 0
itrace("mark_dead_jobs_as_notified: child_max = %d ndead = %d ndeadproc = %d", js.c_childmax, ndead, ndeadproc);
#endif
/* Mark enough dead jobs as notified that we keep CHILD_MAX jobs in
the list. This isn't exactly right yet; changes need to be made
to stop_pipeline so we don't mark the newer jobs after we've
created CHILD_MAX slots in the jobs array. This needs to be
integrated with a way to keep the jobs array from growing without
bound. Maybe we wrap back around to 0 after we reach some max
limit, and there are sufficient job slots free (keep track of total
size of jobs array (js.j_jobslots) and running count of number of jobs
in jobs array. Then keep a job index corresponding to the `oldest job'
and start this loop there, wrapping around as necessary. In effect,
we turn the list into a circular buffer. */
/* XXX could use js.j_firstj here */
for (i = 0; i < js.j_jobslots; i++)
{
if (jobs[i] && DEADJOB (i) && (interactive_shell || (find_last_pid (i, 0) != last_asynchronous_pid)))
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("mark_dead_jobs_as_notified: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("mark_dead_jobs_as_notified: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
/* If marking this job as notified would drop us down below
child_max, don't mark it so we can keep at least child_max
statuses. XXX -- need to check what Posix actually says
about keeping statuses. */
if ((ndeadproc -= processes_in_job (i)) <= js.c_childmax)
break;
jobs[i]->flags |= J_NOTIFIED;
}
}
UNBLOCK_CHILD (oset);
}
/* Here to allow other parts of the shell (like the trap stuff) to
freeze and unfreeze the jobs list. */
void
freeze_jobs_list ()
{
jobs_list_frozen = 1;
}
void
unfreeze_jobs_list ()
{
jobs_list_frozen = 0;
}
/* Allow or disallow job control to take place. Returns the old value
of job_control. */
int
set_job_control (arg)
int arg;
{
int old;
old = job_control;
job_control = arg;
/* If we're turning on job control, reset pipeline_pgrp so make_child will
put new child processes into the right pgrp */
if (job_control != old && job_control)
pipeline_pgrp = 0;
return (old);
}
/* Turn off all traces of job control. This is run by children of the shell
which are going to do shellsy things, like wait (), etc. */
void
without_job_control ()
{
stop_making_children ();
start_pipeline ();
#if defined (PGRP_PIPE)
sh_closepipe (pgrp_pipe);
#endif
delete_all_jobs (0);
set_job_control (0);
}
/* If this shell is interactive, terminate all stopped jobs and
restore the original terminal process group. This is done
before the `exec' builtin calls shell_execve. */
void
end_job_control ()
{
if (interactive_shell) /* XXX - should it be interactive? */
{
terminate_stopped_jobs ();
if (original_pgrp >= 0)
give_terminal_to (original_pgrp, 1);
}
if (original_pgrp >= 0)
setpgid (0, original_pgrp);
}
/* Restart job control by closing shell tty and reinitializing. This is
called after an exec fails in an interactive shell and we do not exit. */
void
restart_job_control ()
{
if (shell_tty != -1)
close (shell_tty);
initialize_job_control (0);
}
/* Set the handler to run when the shell receives a SIGCHLD signal. */
void
set_sigchld_handler ()
{
set_signal_handler (SIGCHLD, sigchld_handler);
}
#if defined (PGRP_PIPE)
/* Read from the read end of a pipe. This is how the process group leader
blocks until all of the processes in a pipeline have been made. */
static void
pipe_read (pp)
int *pp;
{
char ch;
if (pp[1] >= 0)
{
close (pp[1]);
pp[1] = -1;
}
if (pp[0] >= 0)
{
while (read (pp[0], &ch, 1) == -1 && errno == EINTR)
;
}
}
/* Functional interface closes our local-to-job-control pipes. */
void
close_pgrp_pipe ()
{
sh_closepipe (pgrp_pipe);
}
void
save_pgrp_pipe (p, clear)
int *p;
int clear;
{
p[0] = pgrp_pipe[0];
p[1] = pgrp_pipe[1];
if (clear)
pgrp_pipe[0] = pgrp_pipe[1] = -1;
}
void
restore_pgrp_pipe (p)
int *p;
{
pgrp_pipe[0] = p[0];
pgrp_pipe[1] = p[1];
}
#endif /* PGRP_PIPE */