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 } 91
