SIGSUSPEND(2) | System Calls Manual | SIGSUSPEND(2) |
sigsuspend
—
atomically release blocked signals and wait for
interrupt
#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.
The sigsuspend
() function always
terminates by being interrupted, returning -1 with
errno set to EINTR
.
The sigsuspend
function call conforms to
IEEE Std 1003.1-1988 (“POSIX.1”).
June 4, 1993 | macOS 14.6 |