64 lines
1.1 KiB
C
64 lines
1.1 KiB
C
#include <stdio.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* Test that signal masks are respected before threads are started */
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volatile sig_atomic_t flag;
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void handler1(int sig, siginfo_t *info, void *ctx);
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void handler2(int sig, siginfo_t *info, void *ctx);
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void
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handler1(int sig, siginfo_t *info, void *ctx)
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{
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kill(getpid(), SIGUSR2);
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/*
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* If the mask is properly set, SIGUSR2 will not be handled
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* until this handler returns.
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*/
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flag = 1;
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}
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void
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handler2(int sig, siginfo_t *info, void *ctx)
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{
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if (flag == 1)
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flag = 2;
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}
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int
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main(void)
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{
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struct sigaction act;
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int ret;
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act.sa_sigaction = handler1;
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sigemptyset(&act.sa_mask);
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sigaddset(&act.sa_mask, SIGUSR2);
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act.sa_flags = SA_SIGINFO;
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ret = sigaction(SIGUSR1, &act, NULL);
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if (ret) {
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printf("sigaction: %d\n", ret);
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exit(1);
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}
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act.sa_sigaction = handler2;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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ret = sigaction(SIGUSR2, &act, NULL);
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kill(getpid(), SIGUSR1);
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if (flag == 2)
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printf("Success: Both handlers ran in order\n");
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else {
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printf("Failure: flag was %d\n", (int)flag);
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exit(1);
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}
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return 0;
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}
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