sigsetops

SIGSETOPS(3)               Linux Programmer's Manual              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)



Linux 1.0                      24 September 1994                  SIGSETOPS(3)