LXR linux/tools/testing/selftests/proc/self.c

   1/*
   2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
   3 *
   4 * Permission to use, copy, modify, and distribute this software for any
   5 * purpose with or without fee is hereby granted, provided that the above
   6 * copyright notice and this permission notice appear in all copies.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 */
  16// Test that /proc/self gives correct TGID.
  17#undef NDEBUG
  18#include <assert.h>
  19#include <stdio.h>
  20#include <unistd.h>
  21
  22#include "proc.h"
  23
  24int main(void)
  25{
  26        char buf1[64], buf2[64];
  27        pid_t pid;
  28        ssize_t rv;
  29
  30        pid = sys_getpid();
  31        snprintf(buf1, sizeof(buf1), "%u", pid);
  32
  33        rv = readlink("/proc/self", buf2, sizeof(buf2));
  34        assert(rv == strlen(buf1));
  35        buf2[rv] = '\0';
  36        assert(streq(buf1, buf2));
  37
  38        return 0;
  39}
  40