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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | EXAMPLES | SEE ALSO | COLOPHON |
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sigwait(3) Library Functions Manual sigwait(3)
sigwait - wait for a signal
Standard C library (libc, -lc)
#include <signal.h>
int sigwait(const sigset_t *restrict set, int *restrict 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
The sigwait() function suspends execution of the calling thread
until one of the signals specified in the signal set set becomes
pending. For a signal to become pending, it must first be blocked
with sigprocmask(2). 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.
On success, sigwait() returns 0. On error, it returns a positive
error number (listed in ERRORS).
EINVAL set contains an invalid signal number.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ sigwait() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
sigwait() is implemented using sigtimedwait(2); consult its NOTES.
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.
POSIX.1-2008.
POSIX.1-2001.
See pthread_sigmask(3).
sigaction(2), signalfd(2), sigpending(2), sigsuspend(2),
sigwaitinfo(2), sigsetops(3), signal(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 sigwait(3)
Pages that refer to this page: kill(2), signalfd(2), sigsuspend(2), sigwaitinfo(2), pthread_sigmask(3), pthread_sigqueue(3), sigqueue(3), nptl(7), signal(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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