SIGSUSPEND(2) | System Calls Manual | SIGSUSPEND(2) |
sigsuspend
—
#include <signal.h>
int
sigsuspend
(const
sigset_t *sigmask);
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).
sigsuspend
() function always terminates by being
interrupted, returning -1 with errno set to
EINTR
.
sigsuspend
function call conforms to
IEEE Std 1003.1-1990 (“POSIX.1”).
May 16, 1995 | NetBSD 9.2 |