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-rw-r--r--sh/eval.c1257
1 files changed, 0 insertions, 1257 deletions
diff --git a/sh/eval.c b/sh/eval.c
deleted file mode 100644
index 9acfd64..0000000
--- a/sh/eval.c
+++ /dev/null
@@ -1,1257 +0,0 @@
-/* $NetBSD: eval.c,v 1.81.2.1 2005/06/13 22:03:51 tron Exp $ */
-
-/*-
- * Copyright (c) 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Kenneth Almquist.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-#ifndef lint
-#if 0
-static char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95";
-#else
-__RCSID("$NetBSD: eval.c,v 1.81.2.1 2005/06/13 22:03:51 tron Exp $");
-#endif
-#endif /* not lint */
-
-#include <stdlib.h>
-#include <signal.h>
-#include <stdio.h>
-#include <unistd.h>
-#ifdef __linux__
-#include <fcntl.h>
-#else
-#include <sys/fcntl.h>
-#endif
-#include <sys/times.h>
-#include <sys/param.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-/*
- * Evaluate a command.
- */
-
-#include "shell.h"
-#include "nodes.h"
-#include "syntax.h"
-#include "expand.h"
-#include "parser.h"
-#include "jobs.h"
-#include "eval.h"
-#include "builtins.h"
-#include "options.h"
-#include "exec.h"
-#include "redir.h"
-#include "input.h"
-#include "output.h"
-#include "trap.h"
-#include "var.h"
-#include "memalloc.h"
-#include "error.h"
-#include "show.h"
-#include "mystring.h"
-#include "main.h"
-#ifndef SMALL
-#include "myhistedit.h"
-#endif
-
-
-/* flags in argument to evaltree */
-#define EV_EXIT 01 /* exit after evaluating tree */
-#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
-#define EV_BACKCMD 04 /* command executing within back quotes */
-
-int evalskip; /* set if we are skipping commands */
-STATIC int skipcount; /* number of levels to skip */
-MKINIT int loopnest; /* current loop nesting level */
-int funcnest; /* depth of function calls */
-
-
-char *commandname;
-struct strlist *cmdenviron;
-int exitstatus; /* exit status of last command */
-int back_exitstatus; /* exit status of backquoted command */
-
-
-STATIC void evalloop(union node *, int);
-STATIC void evalfor(union node *, int);
-STATIC void evalcase(union node *, int);
-STATIC void evalsubshell(union node *, int);
-STATIC void expredir(union node *);
-STATIC void evalpipe(union node *);
-STATIC void evalcommand(union node *, int, struct backcmd *);
-STATIC void prehash(union node *);
-
-
-/*
- * Called to reset things after an exception.
- */
-
-#ifdef mkinit
-INCLUDE "eval.h"
-
-RESET {
- evalskip = 0;
- loopnest = 0;
- funcnest = 0;
-}
-
-SHELLPROC {
- exitstatus = 0;
-}
-#endif
-
-static int
-sh_pipe(int fds[2])
-{
- int nfd;
-
- if (pipe(fds))
- return -1;
-
- if (fds[0] < 3) {
- nfd = fcntl(fds[0], F_DUPFD, 3);
- if (nfd != -1) {
- close(fds[0]);
- fds[0] = nfd;
- }
- }
-
- if (fds[1] < 3) {
- nfd = fcntl(fds[1], F_DUPFD, 3);
- if (nfd != -1) {
- close(fds[1]);
- fds[1] = nfd;
- }
- }
- return 0;
-}
-
-
-/*
- * The eval commmand.
- */
-
-int
-evalcmd(int argc, char **argv)
-{
- char *p;
- char *concat;
- char **ap;
-
- if (argc > 1) {
- p = argv[1];
- if (argc > 2) {
- STARTSTACKSTR(concat);
- ap = argv + 2;
- for (;;) {
- while (*p)
- STPUTC(*p++, concat);
- if ((p = *ap++) == NULL)
- break;
- STPUTC(' ', concat);
- }
- STPUTC('\0', concat);
- p = grabstackstr(concat);
- }
- evalstring(p, EV_TESTED);
- }
- return exitstatus;
-}
-
-
-/*
- * Execute a command or commands contained in a string.
- */
-
-void
-evalstring(char *s, int flag)
-{
- union node *n;
- struct stackmark smark;
-
- setstackmark(&smark);
- setinputstring(s, 1);
-
- while ((n = parsecmd(0)) != NEOF) {
- evaltree(n, flag);
- popstackmark(&smark);
- }
- popfile();
- popstackmark(&smark);
-}
-
-
-
-/*
- * Evaluate a parse tree. The value is left in the global variable
- * exitstatus.
- */
-
-void
-evaltree(union node *n, int flags)
-{
- if (n == NULL) {
- TRACE(("evaltree(NULL) called\n"));
- exitstatus = 0;
- goto out;
- }
-#ifdef WITH_HISTORY
- displayhist = 1; /* show history substitutions done with fc */
-#endif
- TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
- getpid(), n, n->type, flags));
- switch (n->type) {
- case NSEMI:
- evaltree(n->nbinary.ch1, flags & EV_TESTED);
- if (evalskip)
- goto out;
- evaltree(n->nbinary.ch2, flags);
- break;
- case NAND:
- evaltree(n->nbinary.ch1, EV_TESTED);
- if (evalskip || exitstatus != 0)
- goto out;
- evaltree(n->nbinary.ch2, flags);
- break;
- case NOR:
- evaltree(n->nbinary.ch1, EV_TESTED);
- if (evalskip || exitstatus == 0)
- goto out;
- evaltree(n->nbinary.ch2, flags);
- break;
- case NREDIR:
- expredir(n->nredir.redirect);
- redirect(n->nredir.redirect, REDIR_PUSH);
- evaltree(n->nredir.n, flags);
- popredir();
- break;
- case NSUBSHELL:
- evalsubshell(n, flags);
- break;
- case NBACKGND:
- evalsubshell(n, flags);
- break;
- case NIF: {
- evaltree(n->nif.test, EV_TESTED);
- if (evalskip)
- goto out;
- if (exitstatus == 0)
- evaltree(n->nif.ifpart, flags);
- else if (n->nif.elsepart)
- evaltree(n->nif.elsepart, flags);
- else
- exitstatus = 0;
- break;
- }
- case NWHILE:
- case NUNTIL:
- evalloop(n, flags);
- break;
- case NFOR:
- evalfor(n, flags);
- break;
- case NCASE:
- evalcase(n, flags);
- break;
- case NDEFUN:
- defun(n->narg.text, n->narg.next);
- exitstatus = 0;
- break;
- case NNOT:
- evaltree(n->nnot.com, EV_TESTED);
- exitstatus = !exitstatus;
- break;
- case NPIPE:
- evalpipe(n);
- break;
- case NCMD:
- evalcommand(n, flags, (struct backcmd *)NULL);
- break;
- default:
- out1fmt("Node type = %d\n", n->type);
- flushout(&output);
- break;
- }
-out:
- if (pendingsigs)
- dotrap();
- if ((flags & EV_EXIT) != 0)
- exitshell(exitstatus);
-}
-
-
-STATIC void
-evalloop(union node *n, int flags)
-{
- int status;
-
- loopnest++;
- status = 0;
- for (;;) {
- evaltree(n->nbinary.ch1, EV_TESTED);
- if (evalskip) {
-skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
- evalskip = 0;
- continue;
- }
- if (evalskip == SKIPBREAK && --skipcount <= 0)
- evalskip = 0;
- break;
- }
- if (n->type == NWHILE) {
- if (exitstatus != 0)
- break;
- } else {
- if (exitstatus == 0)
- break;
- }
- evaltree(n->nbinary.ch2, flags & EV_TESTED);
- status = exitstatus;
- if (evalskip)
- goto skipping;
- }
- loopnest--;
- exitstatus = status;
-}
-
-
-
-STATIC void
-evalfor(union node *n, int flags)
-{
- struct arglist arglist;
- union node *argp;
- struct strlist *sp;
- struct stackmark smark;
- int status = 0;
-
- setstackmark(&smark);
- arglist.lastp = &arglist.list;
- for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
- expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
- if (evalskip)
- goto out;
- }
- *arglist.lastp = NULL;
-
- loopnest++;
- for (sp = arglist.list ; sp ; sp = sp->next) {
- setvar(n->nfor.var, sp->text, 0);
- evaltree(n->nfor.body, flags & EV_TESTED);
- status = exitstatus;
- if (evalskip) {
- if (evalskip == SKIPCONT && --skipcount <= 0) {
- evalskip = 0;
- continue;
- }
- if (evalskip == SKIPBREAK && --skipcount <= 0)
- evalskip = 0;
- break;
- }
- }
- loopnest--;
- exitstatus = status;
-out:
- popstackmark(&smark);
-}
-
-
-
-STATIC void
-evalcase(union node *n, int flags)
-{
- union node *cp;
- union node *patp;
- struct arglist arglist;
- struct stackmark smark;
- int status = 0;
-
- setstackmark(&smark);
- arglist.lastp = &arglist.list;
- expandarg(n->ncase.expr, &arglist, EXP_TILDE);
- for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
- for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
- if (casematch(patp, arglist.list->text)) {
- if (evalskip == 0) {
- evaltree(cp->nclist.body, flags);
- status = exitstatus;
- }
- goto out;
- }
- }
- }
-out:
- exitstatus = status;
- popstackmark(&smark);
-}
-
-
-
-/*
- * Kick off a subshell to evaluate a tree.
- */
-
-STATIC void
-evalsubshell(union node *n, int flags)
-{
- struct job *jp;
- int backgnd = (n->type == NBACKGND);
-
- expredir(n->nredir.redirect);
- INTOFF;
- jp = makejob(n, 1);
- if (forkshell(jp, n, backgnd) == 0) {
- INTON;
- if (backgnd)
- flags &=~ EV_TESTED;
- redirect(n->nredir.redirect, 0);
- /* never returns */
- evaltree(n->nredir.n, flags | EV_EXIT);
- }
- if (! backgnd)
- exitstatus = waitforjob(jp);
- INTON;
-}
-
-
-
-/*
- * Compute the names of the files in a redirection list.
- */
-
-STATIC void
-expredir(union node *n)
-{
- union node *redir;
-
- for (redir = n ; redir ; redir = redir->nfile.next) {
- struct arglist fn;
- fn.lastp = &fn.list;
- switch (redir->type) {
- case NFROMTO:
- case NFROM:
- case NTO:
- case NCLOBBER:
- case NAPPEND:
- expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
- redir->nfile.expfname = fn.list->text;
- break;
- case NFROMFD:
- case NTOFD:
- if (redir->ndup.vname) {
- expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
- fixredir(redir, fn.list->text, 1);
- }
- break;
- }
- }
-}
-
-
-
-/*
- * Evaluate a pipeline. All the processes in the pipeline are children
- * of the process creating the pipeline. (This differs from some versions
- * of the shell, which make the last process in a pipeline the parent
- * of all the rest.)
- */
-
-STATIC void
-evalpipe(union node *n)
-{
- struct job *jp;
- struct nodelist *lp;
- int pipelen;
- int prevfd;
- int pip[2];
-
- TRACE(("evalpipe(0x%lx) called\n", (long)n));
- pipelen = 0;
- for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
- pipelen++;
- INTOFF;
- jp = makejob(n, pipelen);
- prevfd = -1;
- for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
- prehash(lp->n);
- pip[1] = -1;
- if (lp->next) {
- if (sh_pipe(pip) < 0) {
- close(prevfd);
- error("Pipe call failed");
- }
- }
- if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
- INTON;
- if (prevfd > 0) {
- close(0);
- copyfd(prevfd, 0);
- close(prevfd);
- }
- if (pip[1] >= 0) {
- close(pip[0]);
- if (pip[1] != 1) {
- close(1);
- copyfd(pip[1], 1);
- close(pip[1]);
- }
- }
- evaltree(lp->n, EV_EXIT);
- }
- if (prevfd >= 0)
- close(prevfd);
- prevfd = pip[0];
- close(pip[1]);
- }
- if (n->npipe.backgnd == 0) {
- exitstatus = waitforjob(jp);
- TRACE(("evalpipe: job done exit status %d\n", exitstatus));
- }
- INTON;
-}
-
-
-
-/*
- * Execute a command inside back quotes. If it's a builtin command, we
- * want to save its output in a block obtained from malloc. Otherwise
- * we fork off a subprocess and get the output of the command via a pipe.
- * Should be called with interrupts off.
- */
-
-void
-evalbackcmd(union node *n, struct backcmd *result)
-{
- int pip[2];
- struct job *jp;
- struct stackmark smark; /* unnecessary */
-
- setstackmark(&smark);
- result->fd = -1;
- result->buf = NULL;
- result->nleft = 0;
- result->jp = NULL;
- if (n == NULL) {
- goto out;
- }
-#ifdef notyet
- /*
- * For now we disable executing builtins in the same
- * context as the shell, because we are not keeping
- * enough state to recover from changes that are
- * supposed only to affect subshells. eg. echo "`cd /`"
- */
- if (n->type == NCMD) {
- exitstatus = oexitstatus;
- evalcommand(n, EV_BACKCMD, result);
- } else
-#endif
- {
- INTOFF;
- if (sh_pipe(pip) < 0)
- error("Pipe call failed");
- jp = makejob(n, 1);
- if (forkshell(jp, n, FORK_NOJOB) == 0) {
- FORCEINTON;
- close(pip[0]);
- if (pip[1] != 1) {
- close(1);
- copyfd(pip[1], 1);
- close(pip[1]);
- }
- eflag = 0;
- evaltree(n, EV_EXIT);
- /* NOTREACHED */
- }
- close(pip[1]);
- result->fd = pip[0];
- result->jp = jp;
- INTON;
- }
-out:
- popstackmark(&smark);
- TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
- result->fd, result->buf, result->nleft, result->jp));
-}
-
-static const char *
-syspath(void)
-{
- static char *sys_path = NULL;
-#ifndef __linux__
- static int mib[] = {CTL_USER, USER_CS_PATH};
-#endif
- static char def_path[] = "PATH=/usr/bin:/bin:/usr/sbin:/sbin";
-
- if (sys_path == NULL) {
-#ifndef __linux__
- size_t len;
- if (sysctl(mib, 2, 0, &len, 0, 0) != -1 &&
- (sys_path = ckmalloc(len + 5)) != NULL &&
- sysctl(mib, 2, sys_path + 5, &len, 0, 0) != -1) {
- memcpy(sys_path, "PATH=", 5);
- } else
-#endif
- {
- ckfree(sys_path);
- /* something to keep things happy */
- sys_path = def_path;
- }
- }
- return sys_path;
-}
-
-static int
-parse_command_args(int argc, char **argv, int *use_syspath)
-{
- int sv_argc = argc;
- char *cp, c;
-
- *use_syspath = 0;
-
- for (;;) {
- argv++;
- if (--argc == 0)
- break;
- cp = *argv;
- if (*cp++ != '-')
- break;
- if (*cp == '-' && cp[1] == 0) {
- argv++;
- argc--;
- break;
- }
- while ((c = *cp++)) {
- switch (c) {
- case 'p':
- *use_syspath = 1;
- break;
- default:
- /* run 'typecmd' for other options */
- return 0;
- }
- }
- }
- return sv_argc - argc;
-}
-
-int vforked = 0;
-
-/*
- * Execute a simple command.
- */
-
-STATIC void
-evalcommand(union node *cmd, int flags, struct backcmd *backcmd)
-{
- struct stackmark smark;
- union node *argp;
- struct arglist arglist;
- struct arglist varlist;
- char **argv;
- int argc;
- char **envp;
- int varflag;
- struct strlist *sp;
- int mode;
- int pip[2];
- struct cmdentry cmdentry;
- struct job *jp;
- struct jmploc jmploc;
- struct jmploc *volatile savehandler;
- char *volatile savecmdname;
- volatile struct shparam saveparam;
- struct localvar *volatile savelocalvars;
- volatile int e;
- char *lastarg;
- const char *path = pathval();
- volatile int temp_path;
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) &argv;
- (void) &argc;
- (void) &lastarg;
- (void) &flags;
-#endif
-
- vforked = 0;
- /* First expand the arguments. */
- TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
- setstackmark(&smark);
- back_exitstatus = 0;
-
- arglist.lastp = &arglist.list;
- varflag = 1;
- /* Expand arguments, ignoring the initial 'name=value' ones */
- for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) {
- char *p = argp->narg.text;
- if (varflag && is_name(*p)) {
- do {
- p++;
- } while (is_in_name(*p));
- if (*p == '=')
- continue;
- }
- expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
- varflag = 0;
- }
- *arglist.lastp = NULL;
-
- expredir(cmd->ncmd.redirect);
-
- /* Now do the initial 'name=value' ones we skipped above */
- varlist.lastp = &varlist.list;
- for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) {
- char *p = argp->narg.text;
- if (!is_name(*p))
- break;
- do
- p++;
- while (is_in_name(*p));
- if (*p != '=')
- break;
- expandarg(argp, &varlist, EXP_VARTILDE);
- }
- *varlist.lastp = NULL;
-
- argc = 0;
- for (sp = arglist.list ; sp ; sp = sp->next)
- argc++;
- argv = stalloc(sizeof (char *) * (argc + 1));
-
- for (sp = arglist.list ; sp ; sp = sp->next) {
- TRACE(("evalcommand arg: %s\n", sp->text));
- *argv++ = sp->text;
- }
- *argv = NULL;
- lastarg = NULL;
- if (iflag && funcnest == 0 && argc > 0)
- lastarg = argv[-1];
- argv -= argc;
-
- /* Print the command if xflag is set. */
- if (xflag) {
- char sep = 0;
- out2str(ps4val());
- for (sp = varlist.list ; sp ; sp = sp->next) {
- if (sep != 0)
- outc(sep, &errout);
- out2str(sp->text);
- sep = ' ';
- }
- for (sp = arglist.list ; sp ; sp = sp->next) {
- if (sep != 0)
- outc(sep, &errout);
- out2str(sp->text);
- sep = ' ';
- }
- outc('\n', &errout);
- flushout(&errout);
- }
-
- /* Now locate the command. */
- if (argc == 0) {
- cmdentry.cmdtype = CMDSPLBLTIN;
- cmdentry.u.bltin = bltincmd;
- } else {
- static const char PATH[] = "PATH=";
- int cmd_flags = DO_ERR;
-
- /*
- * Modify the command lookup path, if a PATH= assignment
- * is present
- */
- for (sp = varlist.list; sp; sp = sp->next)
- if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0)
- path = sp->text + sizeof(PATH) - 1;
-
- do {
- int argsused, use_syspath;
- find_command(argv[0], &cmdentry, cmd_flags, path);
- if (cmdentry.cmdtype == CMDUNKNOWN) {
- exitstatus = 127;
- flushout(&errout);
- goto out;
- }
-
- /* implement the 'command' builtin here */
- if (cmdentry.cmdtype != CMDBUILTIN ||
- cmdentry.u.bltin != bltincmd)
- break;
- cmd_flags |= DO_NOFUNC;
- argsused = parse_command_args(argc, argv, &use_syspath);
- if (argsused == 0) {
- /* use 'type' builting to display info */
- cmdentry.u.bltin = typecmd;
- break;
- }
- argc -= argsused;
- argv += argsused;
- if (use_syspath)
- path = syspath() + 5;
- } while (argc != 0);
- if (cmdentry.cmdtype == CMDSPLBLTIN && cmd_flags & DO_NOFUNC)
- /* posix mandates that 'command <splbltin>' act as if
- <splbltin> was a normal builtin */
- cmdentry.cmdtype = CMDBUILTIN;
- }
-
- /* Fork off a child process if necessary. */
- if (cmd->ncmd.backgnd
- || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0)
- || ((flags & EV_BACKCMD) != 0
- && ((cmdentry.cmdtype != CMDBUILTIN && cmdentry.cmdtype != CMDSPLBLTIN)
- || cmdentry.u.bltin == dotcmd
- || cmdentry.u.bltin == evalcmd))) {
- INTOFF;
- jp = makejob(cmd, 1);
- mode = cmd->ncmd.backgnd;
- if (flags & EV_BACKCMD) {
- mode = FORK_NOJOB;
- if (sh_pipe(pip) < 0)
- error("Pipe call failed");
- }
-#ifdef DO_SHAREDVFORK
- /* It is essential that if DO_SHAREDVFORK is defined that the
- * child's address space is actually shared with the parent as
- * we rely on this.
- */
- if (cmdentry.cmdtype == CMDNORMAL) {
- pid_t pid;
-
- savelocalvars = localvars;
- localvars = NULL;
- vforked = 1;
- switch (pid = vfork()) {
- case -1:
- TRACE(("Vfork failed, errno=%d\n", errno));
- INTON;
- error("Cannot vfork");
- break;
- case 0:
- /* Make sure that exceptions only unwind to
- * after the vfork(2)
- */
- if (setjmp(jmploc.loc)) {
- if (exception == EXSHELLPROC) {
- /* We can't progress with the vfork,
- * so, set vforked = 2 so the parent
- * knows, and _exit();
- */
- vforked = 2;
- _exit(0);
- } else {
- _exit(exerrno);
- }
- }
- savehandler = handler;
- handler = &jmploc;
- listmklocal(varlist.list, VEXPORT | VNOFUNC);
- forkchild(jp, cmd, mode, vforked);
- break;
- default:
- handler = savehandler; /* restore from vfork(2) */
- poplocalvars();
- localvars = savelocalvars;
- if (vforked == 2) {
- vforked = 0;
-
- (void)waitpid(pid, NULL, 0);
- /* We need to progress in a normal fork fashion */
- goto normal_fork;
- }
- vforked = 0;
- forkparent(jp, cmd, mode, pid);
- goto parent;
- }
- } else {
-normal_fork:
-#endif
- if (forkshell(jp, cmd, mode) != 0)
- goto parent; /* at end of routine */
- FORCEINTON;
-#ifdef DO_SHAREDVFORK
- }
-#endif
- if (flags & EV_BACKCMD) {
- if (!vforked) {
- FORCEINTON;
- }
- close(pip[0]);
- if (pip[1] != 1) {
- close(1);
- copyfd(pip[1], 1);
- close(pip[1]);
- }
- }
- flags |= EV_EXIT;
- }
-
- /* This is the child process if a fork occurred. */
- /* Execute the command. */
- switch (cmdentry.cmdtype) {
- case CMDFUNCTION:
-#ifdef DEBUG
- trputs("Shell function: "); trargs(argv);
-#endif
- redirect(cmd->ncmd.redirect, REDIR_PUSH);
- saveparam = shellparam;
- shellparam.malloc = 0;
- shellparam.reset = 1;
- shellparam.nparam = argc - 1;
- shellparam.p = argv + 1;
- shellparam.optnext = NULL;
- INTOFF;
- savelocalvars = localvars;
- localvars = NULL;
- INTON;
- if (setjmp(jmploc.loc)) {
- if (exception == EXSHELLPROC) {
- freeparam((volatile struct shparam *)
- &saveparam);
- } else {
- freeparam(&shellparam);
- shellparam = saveparam;
- }
- poplocalvars();
- localvars = savelocalvars;
- handler = savehandler;
- longjmp(handler->loc, 1);
- }
- savehandler = handler;
- handler = &jmploc;
- listmklocal(varlist.list, 0);
- /* stop shell blowing its stack */
- if (++funcnest > 1000)
- error("too many nested function calls");
- evaltree(cmdentry.u.func, flags & EV_TESTED);
- funcnest--;
- INTOFF;
- poplocalvars();
- localvars = savelocalvars;
- freeparam(&shellparam);
- shellparam = saveparam;
- handler = savehandler;
- popredir();
- INTON;
- if (evalskip == SKIPFUNC) {
- evalskip = 0;
- skipcount = 0;
- }
- if (flags & EV_EXIT)
- exitshell(exitstatus);
- break;
-
- case CMDBUILTIN:
- case CMDSPLBLTIN:
-#ifdef DEBUG
- trputs("builtin command: "); trargs(argv);
-#endif
- mode = (cmdentry.u.bltin == execcmd) ? 0 : REDIR_PUSH;
- if (flags == EV_BACKCMD) {
- memout.nleft = 0;
- memout.nextc = memout.buf;
- memout.bufsize = 64;
- mode |= REDIR_BACKQ;
- }
- e = -1;
- savehandler = handler;
- savecmdname = commandname;
- handler = &jmploc;
- if (!setjmp(jmploc.loc)) {
- /* We need to ensure the command hash table isn't
- * corruped by temporary PATH assignments.
- * However we must ensure the 'local' command works!
- */
- if (path != pathval() && (cmdentry.u.bltin == hashcmd ||
- cmdentry.u.bltin == typecmd)) {
- savelocalvars = localvars;
- localvars = 0;
- mklocal(path - 5 /* PATH= */, 0);
- temp_path = 1;
- } else
- temp_path = 0;
- redirect(cmd->ncmd.redirect, mode);
-
- /* exec is a special builtin, but needs this list... */
- cmdenviron = varlist.list;
- /* we must check 'readonly' flag for all builtins */
- listsetvar(varlist.list,
- cmdentry.cmdtype == CMDSPLBLTIN ? 0 : VNOSET);
- commandname = argv[0];
- /* initialize nextopt */
- argptr = argv + 1;
- optptr = NULL;
- /* and getopt */
-#ifndef __linux__
- optreset = 1;
-#endif
- optind = 1;
- exitstatus = cmdentry.u.bltin(argc, argv);
- } else {
- e = exception;
- exitstatus = e == EXINT ? SIGINT + 128 :
- e == EXEXEC ? exerrno : 2;
- }
- handler = savehandler;
- flushall();
- out1 = &output;
- out2 = &errout;
- freestdout();
- if (temp_path) {
- poplocalvars();
- localvars = savelocalvars;
- }
- cmdenviron = NULL;
- if (e != EXSHELLPROC) {
- commandname = savecmdname;
- if (flags & EV_EXIT)
- exitshell(exitstatus);
- }
- if (e != -1) {
- if ((e != EXERROR && e != EXEXEC)
- || cmdentry.cmdtype == CMDSPLBLTIN)
- exraise(e);
- FORCEINTON;
- }
- if (cmdentry.u.bltin != execcmd)
- popredir();
- if (flags == EV_BACKCMD) {
- backcmd->buf = memout.buf;
- backcmd->nleft = memout.nextc - memout.buf;
- memout.buf = NULL;
- }
- break;
-
- default:
-#ifdef DEBUG
- trputs("normal command: "); trargs(argv);
-#endif
- clearredir(vforked);
- redirect(cmd->ncmd.redirect, vforked ? REDIR_VFORK : 0);
- if (!vforked)
- for (sp = varlist.list ; sp ; sp = sp->next)
- setvareq(sp->text, VEXPORT|VSTACK);
- envp = environment();
- shellexec(argv, envp, path, cmdentry.u.index, vforked);
- break;
- }
- goto out;
-
-parent: /* parent process gets here (if we forked) */
- if (mode == FORK_FG) { /* argument to fork */
- exitstatus = waitforjob(jp);
- } else if (mode == FORK_NOJOB) {
- backcmd->fd = pip[0];
- close(pip[1]);
- backcmd->jp = jp;
- }
- FORCEINTON;
-
-out:
- if (lastarg)
- /* dsl: I think this is intended to be used to support
- * '_' in 'vi' command mode during line editing...
- * However I implemented that within libedit itself.
- */
- setvar("_", lastarg, 0);
- popstackmark(&smark);
-
- if (eflag && exitstatus && !(flags & EV_TESTED))
- exitshell(exitstatus);
-}
-
-
-/*
- * Search for a command. This is called before we fork so that the
- * location of the command will be available in the parent as well as
- * the child. The check for "goodname" is an overly conservative
- * check that the name will not be subject to expansion.
- */
-
-STATIC void
-prehash(union node *n)
-{
- struct cmdentry entry;
-
- if (n->type == NCMD && n->ncmd.args)
- if (goodname(n->ncmd.args->narg.text))
- find_command(n->ncmd.args->narg.text, &entry, 0,
- pathval());
-}
-
-
-
-/*
- * Builtin commands. Builtin commands whose functions are closely
- * tied to evaluation are implemented here.
- */
-
-/*
- * No command given.
- */
-
-int
-bltincmd(int argc, char **argv)
-{
- /*
- * Preserve exitstatus of a previous possible redirection
- * as POSIX mandates
- */
- return back_exitstatus;
-}
-
-
-/*
- * Handle break and continue commands. Break, continue, and return are
- * all handled by setting the evalskip flag. The evaluation routines
- * above all check this flag, and if it is set they start skipping
- * commands rather than executing them. The variable skipcount is
- * the number of loops to break/continue, or the number of function
- * levels to return. (The latter is always 1.) It should probably
- * be an error to break out of more loops than exist, but it isn't
- * in the standard shell so we don't make it one here.
- */
-
-int
-breakcmd(int argc, char **argv)
-{
- int n = argc > 1 ? number(argv[1]) : 1;
-
- if (n > loopnest)
- n = loopnest;
- if (n > 0) {
- evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
- skipcount = n;
- }
- return 0;
-}
-
-
-/*
- * The return command.
- */
-
-int
-returncmd(int argc, char **argv)
-{
- int ret = argc > 1 ? number(argv[1]) : exitstatus;
-
- if (funcnest) {
- evalskip = SKIPFUNC;
- skipcount = 1;
- return ret;
- }
- else {
- /* Do what ksh does; skip the rest of the file */
- evalskip = SKIPFILE;
- skipcount = 1;
- return ret;
- }
-}
-
-
-int
-falsecmd(int argc, char **argv)
-{
- return 1;
-}
-
-
-int
-truecmd(int argc, char **argv)
-{
- return 0;
-}
-
-
-int
-execcmd(int argc, char **argv)
-{
- if (argc > 1) {
- struct strlist *sp;
-
- iflag = 0; /* exit on error */
- mflag = 0;
- optschanged();
- for (sp = cmdenviron; sp; sp = sp->next)
- setvareq(sp->text, VEXPORT|VSTACK);
- shellexec(argv + 1, environment(), pathval(), 0, 0);
- }
- return 0;
-}
-
-static int
-conv_time(clock_t ticks, char *seconds, size_t l)
-{
- static clock_t tpm = 0;
- clock_t mins;
- int i;
-
- mins = ticks / tpm;
- snprintf(seconds, l, "%.4f", (ticks - mins * tpm) * 60.0 / tpm );
-
- if (seconds[0] == '6' && seconds[1] == '0') {
- /* 59.99995 got rounded up... */
- mins++;
- strlcpy(seconds, "0.0", l);
- return mins;
- }
-
- /* suppress trailing zeros */
- i = strlen(seconds) - 1;
- for (; seconds[i] == '0' && seconds[i - 1] != '.'; i--)
- seconds[i] = 0;
- return mins;
-}
-
-int
-timescmd(int argc, char **argv)
-{
- struct tms tms;
- int u, s, cu, cs;
- char us[8], ss[8], cus[8], css[8];
-
- nextopt("");
-
- times(&tms);
-
- u = conv_time(tms.tms_utime, us, sizeof(us));
- s = conv_time(tms.tms_stime, ss, sizeof(ss));
- cu = conv_time(tms.tms_cutime, cus, sizeof(cus));
- cs = conv_time(tms.tms_cstime, css, sizeof(css));
-
- outfmt(out1, "%dm%ss %dm%ss\n%dm%ss %dm%ss\n",
- u, us, s, ss, cu, cus, cs, css);
-
- return 0;
-}
generated by cgit v1.1 at 2025-07-03 11:06:57 +0000