sigwait(3) Library Functions Manual sigwait(3)
NAME
sigwait - wait for a signal
LIBRARY
Standard C library (libc, -lc)
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. For
a signal to become pending, it must first be blocked with sigproc-
mask(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.
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 │
└────────────────────────────────────────────┴───────────────┴─────────┘
VERSIONS
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.
STANDARDS
POSIX.1-2008.
HISTORY
POSIX.1-2001.
EXAMPLES
See pthread_sigmask(3).
SEE ALSO
sigaction(2), signalfd(2), sigpending(2), sigsuspend(2), sigwaitinfo(2),
sigsetops(3), signal(7)
Linux man-pages 6.9.1 2024-05-02 sigwait(3)
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