sigwait(2) BSD System Calls Manual sigwait(2)
NAME
sigwait -- select a set of signals
SYNOPSIS
#include <signal.h>
int
sigwait(const sigset_t *restrict set, int *restrict sig);
DESCRIPTION
The sigwait() function selects a set of signals, specified by set. If
none of the selected signals are pending, sigwait() waits until one or
more of the selected signals has been generated. Then sigwait() atomi-
cally clears one of the selected signals from the set of pending signals
for the process and sets the location pointed to by sig to the signal
number that was cleared.
The signals specified by set should be blocked, but not ignored, at the
time of the call to sigwait().
Processes which call sigwait() on ignored signals will wait indefinitely.
Ignored signals are dropped immediately by the system, before delivery to
a waiting process.
RETURN VALUES
If successful, sigwait() returns 0 and sets the location pointed to by
sig to the cleared signal number. Otherwise, an error number is
returned.
ERRORS
sigwait() will fail if:
[EINVAL] set specifies one or more invalid signal numbers.
SEE ALSO
pthread_sigmask(2), sigaction(2), sigpending(2), sigsuspend(2), pause(3)
STANDARDS
sigwait() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'')
BSD April 27, 2000 BSD
Mac OS X 10.8 - Generated Sat Aug 25 07:10:51 CDT 2012