SIGWAIT
Section: Linux Programmer's Manual (3)
Updated: 2020-06-09
Page Index
NAME
sigwait - wait for a signal
SYNOPSIS
#include <signal.h>
int sigwait(const sigset_t *set, int *sig);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
sigwait():
-
Since glibc 2.26:
_POSIX_C_SOURCE >= 199506L
Glibc 2.25 and earlier:
_POSIX_C_SOURCE
DESCRIPTION
The
sigwait()
function suspends execution of the calling thread until
one of the signals specified in the signal set
set
becomes pending.
The function accepts the signal
(removes it from the pending list of signals),
and returns the signal number in
sig.
The operation of
sigwait()
is the same as
sigwaitinfo(2),
except that:
- *
-
sigwait()
returns only the signal number, rather than a
siginfo_t
structure describing the signal.
- *
-
The return values of the two functions are different.
RETURN VALUE
On success,
sigwait()
returns 0.
On error, it returns a positive error number (listed in ERRORS).
ERRORS
- EINVAL
-
set
contains an invalid signal number.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
sigwait()
| Thread safety | MT-Safe
|
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
NOTES
sigwait()
is implemented using
sigtimedwait(2).
The glibc implementation of
sigwait()
silently ignores attempts to wait for the two real-time signals that
are used internally by the NPTL threading implementation.
See
nptl(7)
for details.
EXAMPLES
See
pthread_sigmask(3).
SEE ALSO
sigaction(2),
signalfd(2),
sigpending(2),
sigsuspend(2),
sigwaitinfo(2),
sigsetops(3),
signal(7)
COLOPHON
This page is part of release 5.10 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.