SIGSETOPS
Section: Linux Programmer's Manual (3)
Updated: 2008-09-01
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);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
sigemptyset(),
sigfillset(),
sigaddset(),
sigdelset(),
sigismember():
-
_POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
DESCRIPTION
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.
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.
NOTES
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 nonstandard (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)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- Glibc Notes
-
- SEE ALSO
-
- COLOPHON
-
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Time: 07:35:12 GMT, March 26, 2013