SIGADDSET
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
sigaddset
--- add a signal to a signal set
SYNOPSIS
#include <signal.h>
int sigaddset(sigset_t *set, int signo);
DESCRIPTION
The
sigaddset()
function adds the individual signal specified by the
signo
to the signal set pointed to by
set.
Applications shall call either
sigemptyset()
or
sigfillset()
at least once for each object of type
sigset_t
prior to any other use of that object. If such an object is not
initialized in this way, but is nonetheless supplied as an argument to
any of
pthread_sigmask(),
sigaction(),
sigaddset(),
sigdelset(),
sigismember(),
sigpending(),
sigprocmask(),
sigsuspend(),
sigtimedwait(),
sigwait(),
or
sigwaitinfo(),
the results are undefined.
RETURN VALUE
Upon successful completion,
sigaddset()
shall return 0; otherwise, it shall return -1 and set
errno
to indicate the error.
ERRORS
The
sigaddset()
function may fail if:
- EINVAL
-
The value of the
signo
argument is an invalid or unsupported signal number.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
Section 2.4,
Signal Concepts,
pthread_sigmask(),
sigaction(),
sigdelset(),
sigemptyset(),
sigfillset(),
sigismember(),
sigpending(),
sigsuspend()
The Base Definitions volume of POSIX.1-2017,
<signal.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
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