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 T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
  10
  11 static int exitcode = 0x6789BEEF;
  12 int should_exit = 0;
  13
  14 void
  15 handler(int sig, siginfo_t *sip, __unused void *uconp)
  16 {
  17         /* Should handle the SIGCHLD signal */
  18         T_ASSERT_EQ_INT(sig, SIGCHLD, "Captured signal returns 0x%x, expected SIGCHLD (0x%x).", sig, SIGCHLD);
  19         T_QUIET; T_ASSERT_NOTNULL(sip, "siginfo_t returned NULL but should have returned data.");
  20         T_ASSERT_EQ_INT(sip->si_code, CLD_EXITED, "si_code returns 0x%x, expected CLD_EXITED (0x%x).", sip->si_code, CLD_EXITED);
  21         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);
  22         should_exit = 1;
  23 }
  24
  25
  26 T_DECL(sigchldreturn, "checks that a child process exited with an exitcode returns correctly to parent", T_META_CHECK_LEAKS(false))
  27 {
  28         struct sigaction act;
  29         int pid;
  30
  31         act.sa_sigaction = handler;
  32         act.sa_flags = SA_SIGINFO;
  33
  34         /* Set action for signal */
  35         T_QUIET; T_ASSERT_POSIX_SUCCESS(sigaction(SIGCHLD, &act, NULL), "Calling sigaction() failed for SIGCHLD");
  36
  37         /* Now fork a child that just exits */
  38         pid = fork();
  39         T_QUIET; T_ASSERT_NE_INT(pid, -1, "fork() failed!");
  40
  41         if (pid == 0) {
  42                 /* Child process! */
  43                 exit(exitcode);
  44         }
  45
  46         /* Main program that did the fork */
  47         /* We should process the signal, then exit */
  48         while (!should_exit) {
  49                 sleep(1);
  50         }
  51 }