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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
int main() {
sigset_t oldset;
const int TRASH = 123;
// TRASH variable, that represents HOW parameter, should be ignored in this case
// Taken from: http://man7.org/linux/man-pages/man2/sigprocmask.2.html :
// If set is NULL, then the signal mask is unchanged (i.e., HOW is
// ignored), but the current value of the signal mask is nevertheless
// returned in oldset (if it is not NULL).
if (sigprocmask(TRASH, NULL, &oldset) == 0) {
exit(EXIT_FAILURE);
} else {
exit(EXIT_SUCCESS);
}
}
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