SIGWAIT(3)

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(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_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

  Multithreading (see pthreads(7))
The sigwait() function is thread-safe.

CONFORMING TO
POSIX.1-2001.

NOTES
sigwait() is implemented using sigtimedwait(2).

EXAMPLE
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 3.65 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.