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.

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 3.53 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/.