SIGSETOPS(3)

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 sigsetops(3) 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
       sigaction(2) sigpending(2) sigprocmask(2) sigsuspend(2)