263 lines
5.2 KiB
C
263 lines
5.2 KiB
C
/*
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* Copyright (C) 2011 Davidlohr Bueso <dave@gnu.org>
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*
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* procutils.c: General purpose procfs parsing utilities
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library Public License for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <ctype.h>
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#include "procutils.h"
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#include "at.h"
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#include "c.h"
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/*
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* @pid: process ID for which we want to obtain the threads group
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*
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* Returns: newly allocated tasks structure
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*/
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struct proc_tasks *proc_open_tasks(pid_t pid)
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{
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struct proc_tasks *tasks;
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char path[PATH_MAX];
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sprintf(path, "/proc/%d/task/", pid);
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tasks = malloc(sizeof(struct proc_tasks));
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if (tasks) {
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tasks->dir = opendir(path);
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if (tasks->dir)
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return tasks;
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}
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free(tasks);
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return NULL;
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}
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/*
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* @tasks: allocated tasks structure
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*
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* Returns: nothing
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*/
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void proc_close_tasks(struct proc_tasks *tasks)
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{
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if (tasks && tasks->dir)
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closedir(tasks->dir);
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free(tasks);
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}
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/*
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* @tasks: allocated task structure
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* @tid: [output] one of the thread IDs belonging to the thread group
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* If when an error occurs, it is set to 0.
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*
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* Returns: 0 on success, 1 on end, -1 on failure or no more threads
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*/
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int proc_next_tid(struct proc_tasks *tasks, pid_t *tid)
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{
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struct dirent *d;
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char *end;
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if (!tasks || !tid)
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return -EINVAL;
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*tid = 0;
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errno = 0;
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do {
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d = readdir(tasks->dir);
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if (!d)
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return errno ? -1 : 1; /* error or end-of-dir */
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if (!isdigit((unsigned char) *d->d_name))
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continue;
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errno = 0;
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*tid = (pid_t) strtol(d->d_name, &end, 10);
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if (errno || d->d_name == end || (end && *end))
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return -1;
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} while (!*tid);
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return 0;
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}
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struct proc_processes *proc_open_processes(void)
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{
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struct proc_processes *ps;
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ps = calloc(1, sizeof(struct proc_processes));
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if (ps) {
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ps->dir = opendir("/proc");
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if (ps->dir)
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return ps;
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}
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free(ps);
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return NULL;
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}
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void proc_close_processes(struct proc_processes *ps)
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{
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if (ps && ps->dir)
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closedir(ps->dir);
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free(ps);
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}
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void proc_processes_filter_by_name(struct proc_processes *ps, const char *name)
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{
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ps->fltr_name = name;
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ps->has_fltr_name = name ? 1 : 0;
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}
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void proc_processes_filter_by_uid(struct proc_processes *ps, uid_t uid)
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{
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ps->fltr_uid = uid;
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ps->has_fltr_uid = 1;
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}
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int proc_next_pid(struct proc_processes *ps, pid_t *pid)
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{
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struct dirent *d;
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if (!ps || !pid)
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return -EINVAL;
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*pid = 0;
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errno = 0;
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do {
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char buf[BUFSIZ], *p;
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d = readdir(ps->dir);
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if (!d)
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return errno ? -1 : 1; /* error or end-of-dir */
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if (!isdigit((unsigned char) *d->d_name))
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continue;
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/* filter out by UID */
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if (ps->has_fltr_uid) {
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struct stat st;
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if (fstat_at(dirfd(ps->dir), "/proc", d->d_name, &st, 0))
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continue;
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if (ps->fltr_uid != st.st_uid)
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continue;
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}
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/* filter out by NAME */
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if (ps->has_fltr_name) {
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char procname[256];
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FILE *f;
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snprintf(buf, sizeof(buf), "%s/stat", d->d_name);
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f = fopen_at(dirfd(ps->dir), "/proc", buf,
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O_CLOEXEC|O_RDONLY, "r");
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if (!f)
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continue;
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p = fgets(buf, sizeof(buf), f);
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fclose(f);
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if (sscanf(buf, "%*d (%255[^)])", procname) != 1)
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continue;
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/* ok, we got the process name. */
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if (strcmp(procname, ps->fltr_name) != 0)
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continue;
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}
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p = NULL;
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errno = 0;
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*pid = (pid_t) strtol(d->d_name, &p, 10);
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if (errno || d->d_name == p || (p && *p))
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return errno ? -errno : -1;
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return 0;
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} while (1);
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return 0;
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}
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#ifdef TEST_PROGRAM
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static int test_tasks(int argc, char *argv[])
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{
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pid_t tid, pid;
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struct proc_tasks *ts;
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if (argc != 2)
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return EXIT_FAILURE;
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pid = strtol(argv[1], (char **) NULL, 10);
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printf("PID=%d, TIDs:", pid);
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ts = proc_open_tasks(pid);
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if (!ts)
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err(EXIT_FAILURE, "open list of tasks failed");
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while (proc_next_tid(ts, &tid) == 0)
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printf(" %d", tid);
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printf("\n");
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proc_close_tasks(ts);
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return EXIT_SUCCESS;
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}
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static int test_processes(int argc, char *argv[])
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{
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pid_t pid;
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struct proc_processes *ps;
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ps = proc_open_processes();
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if (!ps)
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err(EXIT_FAILURE, "open list of processes failed");
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if (argc >= 3 && strcmp(argv[1], "--name") == 0)
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proc_processes_filter_by_name(ps, argv[2]);
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if (argc >= 3 && strcmp(argv[1], "--uid") == 0)
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proc_processes_filter_by_uid(ps, (uid_t) atol(argv[2]));
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while (proc_next_pid(ps, &pid) == 0)
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printf(" %d", pid);
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printf("\n");
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proc_close_processes(ps);
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return EXIT_SUCCESS;
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}
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int main(int argc, char *argv[])
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{
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if (argc < 2) {
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fprintf(stderr, "usage: %1$s --tasks <pid>\n"
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" %1$s --processes [---name <name>] [--uid <uid>]\n",
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program_invocation_short_name);
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return EXIT_FAILURE;
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}
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if (strcmp(argv[1], "--tasks") == 0)
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return test_tasks(argc - 1, argv + 1);
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if (strcmp(argv[1], "--processes") == 0)
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return test_processes(argc - 1, argv + 1);
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return EXIT_FAILURE;
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}
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#endif /* TEST_PROGRAM */
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