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"