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SIGSETOPS(3)               Linux Programmer's Manual              SIGSETOPS(3)



NAME
       sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX signal set oper-
       ations.


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 VALUE
       sigemptyset(),  sigfillset(),  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.1-2001.

GLIBC NOTES
       If  the  _GNU_SOURCE  feature  test macro is defined, then <signal.h> exposes three
       other functions for manipulating signal sets.

       int sigisemptyset(sigset_t *set);
              returns 1 if set contains no signals, and 0 otherwise.

       int sigorset(sigset_t *dest, sigset_t *left, sigset_t *right);
              places the union of the sets left and right in dest.

       int sigandset(sigset_t *dest, sigset_t *left, sigset_t *right);
              places the intersection of the sets left and right in dest.

       sigorset() and sigandset() return 0 on success, and -1 on failure.

       These functions are non-standard (a few other systems  provide  similar  functions)
       and their use should be avoided in portable applications.

SEE ALSO
       sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)



Linux 2.6.14                      2005-11-17                      SIGSETOPS(3)

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