ubase/pidof.c
sin f5ebc6350b Import sys/queue.h and move over existing tools
We should stop rolling data structure implementations in every
tool.
2014-06-30 13:06:07 +01:00

115 lines
2.0 KiB
C

/* See LICENSE file for copyright and license details. */
#include <sys/types.h>
#include <unistd.h>
#include <dirent.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "proc.h"
#include "queue.h"
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-o pid1,pid2,...pidN] [-s] [program...]\n", argv0);
}
struct pidentry {
pid_t pid;
TAILQ_ENTRY(pidentry) entry;
};
static TAILQ_HEAD(omitpid_head, pidentry) omitpid_head;
int
main(int argc, char *argv[])
{
DIR *dp;
struct dirent *entry;
pid_t pid;
struct procstat ps;
char cmdline[BUFSIZ], *cmd, *p, *arg = NULL;
int i, found = 0;
int sflag = 0, oflag = 0;
struct pidentry *pe, *tmp;
ARGBEGIN {
case 's':
sflag = 1;
break;
case 'o':
oflag = 1;
arg = EARGF(usage());
break;
default:
usage();
} ARGEND;
if (!argc)
return 1;
TAILQ_INIT(&omitpid_head);
for (p = strtok(arg, ","); p; p = strtok(NULL, ",")) {
pe = emalloc(sizeof(*pe));
if (strcmp(p, "%PPID") == 0)
pe->pid = getppid();
else
pe->pid = estrtol(p, 10);
TAILQ_INSERT_TAIL(&omitpid_head, pe, entry);
}
if (!(dp = opendir("/proc")))
eprintf("opendir /proc:");
while ((entry = readdir(dp))) {
if (!pidfile(entry->d_name))
continue;
pid = estrtol(entry->d_name, 10);
if (oflag) {
TAILQ_FOREACH(pe, &omitpid_head, entry)
if (pe->pid == pid)
break;
if (pe)
continue;
}
if (parsestat(pid, &ps) < 0)
continue;
if (parsecmdline(ps.pid, cmdline,
sizeof(cmdline)) < 0) {
cmd = ps.comm;
} else {
if ((p = strchr(cmdline, ' ')))
*p = '\0';
cmd = basename(cmdline);
}
/* Workaround for login shells */
if (cmd[0] == '-')
cmd++;
for (i = 0; i < argc; i++) {
if (strcmp(cmd, argv[i]) == 0) {
putword(entry->d_name);
found++;
if (sflag)
goto out;
}
}
}
out:
if (found)
putchar('\n');
closedir(dp);
for (pe = TAILQ_FIRST(&omitpid_head); pe; pe = tmp) {
tmp = TAILQ_NEXT(pe, entry);
free(pe);
}
return EXIT_SUCCESS;
}