NAME
sigsuspend —
atomically release blocked signals and
wait for interrupt
LIBRARY
library “libc”
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
The sigsuspend() 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
The sigsuspend() system call is expected
to conform to IEEE Std 1003.1-1990
(“POSIX.1”).