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 the delivery of one of the signals specified in the signal set set. 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(), except that:

* sigwait() only returns 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.

ERRORS

EINVAL set contains an invalid signal number.

CONFORMING TO

POSIX.1-2001.

NOTES

sigwait() is implemented using sigtimedwait(2).

EXAMPLES

See pthread_sigmask(3).

SEE ALSO

sigaction(2), signalfd(2), sigpending(2), sigsuspend(2), sigwaitinfo(2), sigsetops(3), signal(7)

COLOPHON

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