regress/lib/libpthread/sigmask2/sigmask2.c

   1 #include <stdio.h>
   2 #include <signal.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5
   6 /* Test that signal masks are respected before threads are started */
   7 volatile sig_atomic_t flag;
   8
   9 void handler1(int sig, siginfo_t *info, void *ctx);
  10 void handler2(int sig, siginfo_t *info, void *ctx);
  11
  12 void
  13 handler1(int sig, siginfo_t *info, void *ctx)
  14 {
  15
  16         kill(getpid(), SIGUSR2);
  17         /*
  18          * If the mask is properly set, SIGUSR2 will not be handled
  19          * until this handler returns.
  20          */
  21         flag = 1;
  22 }
  23
  24 void
  25 handler2(int sig, siginfo_t *info, void *ctx)
  26 {
  27         if (flag == 1)
  28                 flag = 2;
  29 }
  30
  31 int
  32 main(void)
  33 {
  34         struct sigaction act;
  35         int ret;
  36
  37         act.sa_sigaction = handler1;
  38         sigemptyset(&act.sa_mask);
  39         sigaddset(&act.sa_mask, SIGUSR2);
  40         act.sa_flags = SA_SIGINFO;
  41
  42         ret = sigaction(SIGUSR1, &act, NULL);
  43         if (ret) {
  44                 printf("sigaction: %d\n", ret);
  45                 exit(1);
  46         }
  47
  48         act.sa_sigaction = handler2;
  49         sigemptyset(&act.sa_mask);
  50         act.sa_flags = SA_SIGINFO;
  51         ret = sigaction(SIGUSR2, &act, NULL);
  52
  53         kill(getpid(), SIGUSR1);
  54
  55         if (flag == 2)
  56                 printf("Success: Both handlers ran in order\n");
  57         else {
  58                 printf("Failure: flag was %d\n", (int)flag);
  59                 exit(1);
  60         }
  61
  62         return 0;
  63 }