NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
SIGSETOPS(3) Linux Programmer's Manual SIGSETOPS(3)
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX signal set
operations.
#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);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
sigemptyset(), sigfillset(), sigaddset(), sigdelset(), sigismember():
_POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
These 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.
Objects of type sigset_t must be initialized by a call to either sigemptyset()
or sigfillset() before being passed to the functions sigaddset(), sigdelset()
and sigismember() or the additional glibc functions described below
(sigisemptyset(), sigandset(), and sigorset()). The results are undefined if
this is not done.
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.
EINVAL sig is not a valid signal.
POSIX.1-2001.
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.
sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2008-09-01 SIGSETOPS(3)