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SIGSUSPEND(2) | System Calls Manual | SIGSUSPEND(2) |
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¶
Thesigsuspend
() system call 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¶
Thesigsuspend
() system call always
terminates by being interrupted, returning -1 with
errno set to
EINTR
.
SEE ALSO¶
pselect(2), sigaction(2), sigpending(2), sigprocmask(2), sigtimedwait(2), sigwait(2), sigwaitinfo(2), sigsetops(3)STANDARDS¶
Thesigsuspend
() system call is expected to
conform to IEEE Std 1003.1-1990
(“POSIX.1”).August 16, 2013 | Debian |