|SIGWAIT(3)||Library Functions Manual||SIGWAIT(3)|
synchronously accept a signal
sigset_t *set, int
function selects a pending signal from set, atomically
clears it from the system's set of pending signals, and returns that signal
number in the location referenced by sig. If prior to
the call to
sigwait() there are multiple pending
instances of a single signal number, it is undefined whether upon successful
return there are any remaining pending signals for that signal number. If no
signal in set is pending at the time of the call, the
thread shall be suspended until one or more becomes pending. The signals
defined by set should have been blocked at the time of
the call to
sigwait(); otherwise the behaviour is
undefined. The effect of
sigwait() on the signal
actions for the signals in set is unspecified.
If more than one thread is using
to wait for the same signal, no more than one of these threads shall return
sigwait() with the signal number. Which thread
sigwait() if more than a single thread
is waiting is unspecified.
Upon successful completion,
stores the signal number of the received signal at the location referenced
by sig and returns zero.
sigwait() returns one of these
sigwait() conforms to
ISO/IEC 9945-1:1996 (“POSIX.1”).
|January 13, 2019||OpenBSD-current|