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SIGWAIT(3) Linux Programmer's Manual SIGWAIT(3)
NAME
sigwait - wait for a signal
SYNOPSIS
#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
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 implementa‐
tion. 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)
Linux 2021-03-22 SIGWAIT(3)