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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)