NAME
sigsuspend —
atomically release blocked signals and
wait for interrupt
SYNOPSIS
#include
<signal.h>
int
sigsuspend(const sigset_t
*sigmask);
DESCRIPTION
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.
RETURN VALUES
The sigsuspend() function always
terminates by being interrupted, returning -1 with
errno set to EINTR.
SEE ALSO
STANDARDS
The sigsuspend function call conforms to
IEEE Std 1003.1-1988 (“POSIX.1”).