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#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <pwd.h>
static char *nexttoksep(char **strp, char *sep)
{
char *p = strsep(strp,sep);
return (p == 0) ? "" : p;
}
static char *nexttok(char **strp)
{
return nexttoksep(strp, " ");
}
#define SHOW_PRIO 1
#define SHOW_TIME 2
static int display_flags = 0;
static int ps_line(int pid, int tid, char *namefilter)
{
char statline[1024];
char cmdline[1024];
char user[32];
struct stat stats;
int fd, r;
char *ptr, *name, *state;
int ppid, tty;
unsigned wchan, rss, vss, eip;
unsigned utime, stime;
int prio, nice, rtprio, sched;
struct passwd *pw;
sprintf(statline, "/proc/%d", pid);
stat(statline, &stats);
if(tid) {
sprintf(statline, "/proc/%d/task/%d/stat", pid, tid);
cmdline[0] = 0;
} else {
sprintf(statline, "/proc/%d/stat", pid);
sprintf(cmdline, "/proc/%d/cmdline", pid);
fd = open(cmdline, O_RDONLY);
if(fd == 0) {
r = 0;
} else {
r = read(fd, cmdline, 1023);
close(fd);
if(r < 0) r = 0;
}
cmdline[r] = 0;
}
fd = open(statline, O_RDONLY);
if(fd == 0) return -1;
r = read(fd, statline, 1023);
close(fd);
if(r < 0) return -1;
statline[r] = 0;
ptr = statline;
nexttok(&ptr); // skip pid
ptr++; // skip "("
name = ptr;
ptr = strrchr(ptr, ')'); // Skip to *last* occurence of ')',
*ptr++ = '\0'; // and null-terminate name.
ptr++; // skip " "
state = nexttok(&ptr);
ppid = atoi(nexttok(&ptr));
nexttok(&ptr); // pgrp
nexttok(&ptr); // sid
tty = atoi(nexttok(&ptr));
nexttok(&ptr); // tpgid
nexttok(&ptr); // flags
nexttok(&ptr); // minflt
nexttok(&ptr); // cminflt
nexttok(&ptr); // majflt
nexttok(&ptr); // cmajflt
#if 1
utime = atoi(nexttok(&ptr));
stime = atoi(nexttok(&ptr));
#else
nexttok(&ptr); // utime
nexttok(&ptr); // stime
#endif
nexttok(&ptr); // cutime
nexttok(&ptr); // cstime
prio = atoi(nexttok(&ptr));
nice = atoi(nexttok(&ptr));
nexttok(&ptr); // threads
nexttok(&ptr); // itrealvalue
nexttok(&ptr); // starttime
vss = strtoul(nexttok(&ptr), 0, 10); // vsize
rss = strtoul(nexttok(&ptr), 0, 10); // rss
nexttok(&ptr); // rlim
nexttok(&ptr); // startcode
nexttok(&ptr); // endcode
nexttok(&ptr); // startstack
nexttok(&ptr); // kstkesp
eip = strtoul(nexttok(&ptr), 0, 10); // kstkeip
nexttok(&ptr); // signal
nexttok(&ptr); // blocked
nexttok(&ptr); // sigignore
nexttok(&ptr); // sigcatch
wchan = strtoul(nexttok(&ptr), 0, 10); // wchan
nexttok(&ptr); // nswap
nexttok(&ptr); // cnswap
nexttok(&ptr); // exit signal
nexttok(&ptr); // processor
rtprio = atoi(nexttok(&ptr)); // rt_priority
sched = atoi(nexttok(&ptr)); // scheduling policy
tty = atoi(nexttok(&ptr));
if(tid != 0) {
ppid = pid;
pid = tid;
}
pw = getpwuid(stats.st_uid);
if(pw == 0) {
sprintf(user,"%d",(int)stats.st_uid);
} else {
strcpy(user,pw->pw_name);
}
if(!namefilter || !strncmp(name, namefilter, strlen(namefilter))) {
printf("%-8s %-5d %-5d %-5d %-5d", user, pid, ppid, vss / 1024, rss * 4);
if(display_flags&SHOW_PRIO)
printf(" %-5d %-5d %-5d %-5d", prio, nice, rtprio, sched);
printf(" %08x %08x %s %s", wchan, eip, state, cmdline[0] ? cmdline : name);
if(display_flags&SHOW_TIME)
printf(" (u:%d, s:%d)", utime, stime);
printf("\n");
}
return 0;
}
void ps_threads(int pid, char *namefilter)
{
char tmp[128];
DIR *d;
struct dirent *de;
sprintf(tmp,"/proc/%d/task",pid);
d = opendir(tmp);
if(d == 0) return;
while((de = readdir(d)) != 0){
if(isdigit(de->d_name[0])){
int tid = atoi(de->d_name);
if(tid == pid) continue;
ps_line(pid, tid, namefilter);
}
}
closedir(d);
}
int ps_main(int argc, char **argv)
{
DIR *d;
struct dirent *de;
char *namefilter = 0;
int pidfilter = 0;
int threads = 0;
d = opendir("/proc");
if(d == 0) return -1;
while(argc > 1){
if(!strcmp(argv[1],"-t")) {
threads = 1;
} else if(!strcmp(argv[1],"-x")) {
display_flags |= SHOW_TIME;
} else if(!strcmp(argv[1],"-p")) {
display_flags |= SHOW_PRIO;
} else if(isdigit(argv[1][0])){
pidfilter = atoi(argv[1]);
} else {
namefilter = argv[1];
}
argc--;
argv++;
}
printf("USER PID PPID VSIZE RSS %sWCHAN PC NAME\n",
(display_flags&SHOW_PRIO)?"PRIO NICE RTPRI SCHED ":"");
while((de = readdir(d)) != 0){
if(isdigit(de->d_name[0])){
int pid = atoi(de->d_name);
if(!pidfilter || (pidfilter == pid)) {
ps_line(pid, 0, namefilter);
if(threads) ps_threads(pid, namefilter);
}
}
}
closedir(d);
return 0;
}
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