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Command: sigsuspend | Section: 2 | Source: OpenBSD | File: sigsuspend.2
SIGSUSPEND(2) FreeBSD System Calls Manual SIGSUSPEND(2)
NAME
sigsuspend - atomically change the signal mask and wait for interrupt
SYNOPSIS
#include <signal.h>
int
sigsuspend(const sigset_t *sigmask);
DESCRIPTION
sigsuspend() temporarily changes the blocked signal mask to the set to
which sigmask points, and then waits for a signal to arrive; on return
the previous set of masked signals is restored. The signal mask set is
usually empty to indicate that all signals are to be unblocked for the
duration of the call.
In normal usage, a signal is blocked using sigprocmask(2) to begin a
critical section, variables modified on the occurrence of the signal are
examined to determine that there is no work to be done, and the process
pauses awaiting work by using sigsuspend() with the previous mask
returned by sigprocmask(2).
RETURN VALUES
The sigsuspend() function always terminates by being interrupted,
returning -1 with errno set to EINTR.
SEE ALSO
sigaction(2), sigprocmask(2), sigaddset(3)
STANDARDS
The sigsuspend() function call conforms to IEEE Std 1003.1-2008
("POSIX.1").
FreeBSD 14.1-RELEASE-p8 May 29, 2017 FreeBSD 14.1-RELEASE-p8