67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <setjmp.h>
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const int SIGNAL_TYPE = SIGSEGV;
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// Global flag and jump buffer for recovery
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static jmp_buf env_buffer;
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static volatile int handled = 0;
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void handler(int signal_num) {
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handled += 1;
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longjmp(env_buffer, 1);
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}
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int trigger() {
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if(setjmp(env_buffer)) {
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return 1;
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}
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//volatile char _ = *((char*)0);
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raise(SIGNAL_TYPE);
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return 0;
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}
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int printSigMasks() {
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sigset_t set;
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// Get the current signal mask
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if (sigprocmask(SIG_BLOCK, NULL, &set) == -1) {
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perror("sigprocmask");
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return 1;
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}
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// Print blocked signal masks
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int blocked = 0;
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for (int i = 1; i < NSIG; ++i) {
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if (sigismember(&set, i)) {
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blocked += 1;
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printf("Signal %d is blocked\n", i);
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}
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}
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if(!blocked) {
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printf("No blocked signals\n");
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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printf("NSIG = %i\n", NSIG);
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void* sig_res = signal(SIGNAL_TYPE, handler);
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if(sig_res == SIG_ERR) {
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printf("Error setting signal handler\n");
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exit(EXIT_FAILURE);
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}
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int result = 0;
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printSigMasks();
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result = trigger();
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printf("Raised = %i\tHandled = %i\n", result, handled);
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printSigMasks();
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result = trigger();
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printf("Raised = %i\tHandled = %i\n", result, handled);
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printSigMasks();
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return EXIT_SUCCESS;
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}
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