malloc/tst-mallocfork.c

   1 /* Derived from the test case in
   2    https://sourceware.org/bugzilla/show_bug.cgi?id=838.  */
   3 #include <assert.h>
   4 #include <errno.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <sys/types.h>
   9 #include <sys/wait.h>
  10 #include <libc-diag.h>
  11
  12 static void
  13 sig_handler (int signum)
  14 {
  15   pid_t child = fork ();
  16   if (child == 0)
  17     exit (0);
  18   TEMP_FAILURE_RETRY (waitpid (child, NULL, 0));
  19 }
  20
  21 static int
  22 do_test (void)
  23 {
  24   pid_t parent = getpid ();
  25
  26   struct sigaction action = { .sa_handler = sig_handler };
  27   sigemptyset (&action.sa_mask);
  28
  29   DIAG_PUSH_NEEDS_COMMENT;
  30   DIAG_IGNORE_NEEDS_COMMENT (10, "-Wunused-result");
  31   /* The result of malloc is deliberately ignored, so do not warn
  32      about that.  */
  33   malloc (sizeof (int));
  34   DIAG_POP_NEEDS_COMMENT;
  35
  36   if (sigaction (SIGALRM, &action, NULL) != 0)
  37     {
  38       puts ("sigaction failed");
  39       return 1;
  40     }
  41
  42   /* Create a child that sends the signal to be caught.  */
  43   pid_t child = fork ();
  44   if (child == 0)
  45     {
  46       if (kill (parent, SIGALRM) == -1)
  47         perror ("kill");
  48       exit (0);
  49     }
  50
  51   TEMP_FAILURE_RETRY (waitpid (child, NULL, 0));
  52
  53   return 0;
  54 }
  55
  56 #define TEST_FUNCTION do_test ()
  57 #include "../test-skeleton.c"