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SIGSUSPEND(2)		  FreeBSD 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
     The sigsuspend() 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
     sigaction(2), sigpending(2), sigprocmask(2), sigsetops(3)

STANDARDS
     The sigsuspend() system call is expected to conform to ISO/IEC
     9945-1:1990 (``POSIX.1'').

FreeBSD	9.3			 May 16, 1995			   FreeBSD 9.3

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS

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