NAME
sigsuspend —
atomically release blocked
signals and wait for interrupt
LIBRARY
Standard C Library (libc, -lc)
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),
sigsetops(3),
signal(7)
STANDARDS
The
sigsuspend function call conforms to
IEEE
Std 1003.1-1990 (“POSIX.1”).