none/tests/pending.c

   1 /*
   2    Test pending signals
   3
   4    1. Signals should remain pending while blocked, and not delivered early
   5
   6    2. When unblocking the signal, the signal should have been delivered
   7       by the time sigprocmask syscall is complete.
   8  */
   9 #include <signal.h>
  10 #include <stdio.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include "config.h"
  14
  15 static volatile int gotsig = 0;
  16 static volatile int early = 1;
  17
  18 static void handler(int sig)
  19 {
  20         printf("4: got signal %s\n",
  21                 ( sig == SIGUSR1 ? "SIGUSR1" : "unexpected signal" ));
  22
  23         if (sig != SIGUSR1) {
  24                 fprintf(stderr, "FAILED: got signal %d instead\n", sig);
  25                 exit(1);
  26         }
  27
  28         if (early) {
  29                 fprintf(stderr, "FAILED: signal delivered early (in handler)\n");
  30                 exit(1);
  31         }
  32
  33         gotsig = 1;
  34 }
  35
  36 int main()
  37 {
  38         sigset_t all;
  39         sigset_t sigusr1;
  40
  41         sigfillset(&all);
  42         sigemptyset(&sigusr1);
  43         sigaddset(&sigusr1, SIGUSR1);
  44
  45         sigprocmask(SIG_BLOCK, &all, NULL);
  46
  47         signal(SIGUSR1, handler);
  48         signal(SIGHUP,  handler);
  49
  50         printf("1: sending signal\n");
  51         kill(getpid(), SIGUSR1);
  52         kill(getpid(), SIGHUP);
  53
  54         printf("2: sleeping\n");
  55         sleep(1);
  56
  57         if (gotsig) {
  58                 fprintf(stderr, "FAILED: signal delivered too early\n");
  59                 return 1;
  60         }
  61
  62         printf("3: unblocking\n");
  63         early = 0;
  64         sigprocmask(SIG_UNBLOCK, &sigusr1, NULL);
  65
  66         printf("5: unblocked...\n");
  67         if (!gotsig) {
  68                 fprintf(stderr, "FAILED: signal not delivered\n");
  69                 return 1;
  70         }
  71
  72         printf("6: checking SIGHUP still pending...\n");
  73 #       if HAVE_SIGWAITINFO
  74         {
  75                 siginfo_t info;
  76                 if (sigwaitinfo(&all, &info) == -1) {
  77                         perror("FAILED: sigwaitinfo failed");
  78                         return 1;
  79                 }
  80                 if (info.si_signo != SIGHUP) {
  81                         fprintf(stderr, "FAILED: SIGHUP not still pending; got signal %d\n",
  82                                 info.si_signo);
  83                         return 1;
  84                 }
  85         }
  86 #       endif
  87
  88         printf("OK\n");
  89         return 0;
  90 }