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
  24 int 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 }