tests/sigchld_return.c

   1 #include <signal.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <errno.h>
   6
   7 #include <darwintest.h>
   8
   9
  10 static int exitcode = 0x6789BEEF;
  11 int should_exit = 0;
  12
  13 void handler (int sig, siginfo_t *sip, __unused void *uconp)
  14 {
  15         /* Should handle the SIGCHLD signal */
  16         T_ASSERT_EQ_INT(sig, SIGCHLD, "Captured signal returns 0x%x, expected SIGCHLD (0x%x).", sig, SIGCHLD);
  17         T_QUIET; T_ASSERT_NOTNULL(sip, "siginfo_t returned NULL but should have returned data.");
  18         T_ASSERT_EQ_INT(sip->si_code, CLD_EXITED, "si_code returns 0x%x, expected CLD_EXITED (0x%x).", sip->si_code, CLD_EXITED);
  19         T_ASSERT_EQ_INT(sip->si_status, exitcode, "si_status returns 0x%08X, expected the child's exit code (0x%08X).", sip->si_status, exitcode);
  20         should_exit = 1;
  21 }
  22
  23
  24 T_DECL(sigchldreturn, "checks that a child process exited with an exitcode returns correctly to parent", T_META_CHECK_LEAKS(false))
  25 {
  26         struct sigaction act;
  27         int pid;
  28
  29         act.sa_sigaction = handler;
  30         act.sa_flags = SA_SIGINFO;
  31
  32         /* Set action for signal */
  33         T_QUIET; T_ASSERT_POSIX_SUCCESS(sigaction (SIGCHLD, &act, NULL), "Calling sigaction() failed for SIGCHLD");
  34
  35         /* Now fork a child that just exits */
  36         pid = fork();
  37         T_QUIET; T_ASSERT_NE_INT(pid, -1, "fork() failed!");
  38
  39         if (pid == 0) {
  40                 /* Child process! */
  41                 exit (exitcode);
  42         }
  43
  44         /* Main program that did the fork */
  45         /* We should process the signal, then exit */
  46         while (!should_exit) {
  47                 sleep(1);
  48         }
  49 }
  50