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SIGSETOPS Section: Linux Programmer's Manual (3) Updated: 24 September 2025 Index   NAME sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX signal set operations.   SYNOPSIS #include <signal.h> int sigemptyset(sigset_t *set); int sigfillset(sigset_t *set); int sigaddset(sigset_t *set, int signum); int sigdelset(sigset_t *set, int signum); int sigismember(const sigset_t *set, int signum);   DESCRIPTION The functions allow the manipulation of POSIX signal sets. sigemptyset initializes the signal set given by set to empty, with all signals excluded from the set. sigfillset initializes set to full, including all signals. sigaddset and sigdelset add and delete respectively signal signum from set. sigismember tests whether signum is a member of set.   RETURN VALUES sigemptyset, sigfullset, sigaddset and sigdelset return 0 on success and -1 on error. sigismember returns 1 if signum is a member of set, 0 if signum is not a member, and -1 on error.   ERRORS EINVAL sig is not a valid signal.   CONFORMING TO POSIX   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUES ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:06 GMT, March 24, 2025

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