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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)sigpause.2 8.1 (Berkeley) 6/2/93
.\" $FreeBSD$
.\"
.Dd June 2, 1993
.Dt SIGPAUSE 2
.Os
.Sh NAME
.Nm sigpause
.Nd atomically release blocked signals and wait for interrupt
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In signal.h
.Ft int
.Fn sigpause "int sigmask"
.Sh DESCRIPTION
.Sy This interface is made obsolete by
.Xr sigsuspend 2 .
.Pp
The
.Fn sigpause
function
assigns
.Fa sigmask
to the set of masked signals
and then waits for a signal to arrive;
on return the set of masked signals is restored.
The
.Fa sigmask
argument
is usually 0 to indicate that no
signals are to be blocked.
The
.Fn sigpause
function
always terminates by being interrupted, returning -1 with
.Va errno
set to
.Er EINTR
.Sh SEE ALSO
.Xr kill 2 ,
.Xr sigaction 2 ,
.Xr sigblock 2 ,
.Xr sigprocmask 2 ,
.Xr sigsuspend 2 ,
.Xr sigvec 2
.Sh STANDARDS
The
.Fn sigpause
function is implemented for compatibility with historic
.Bx 4.3
applications.
An incompatible interface by the same name, which used a single signal number
rather than a mask, was present in
.At V ,
and was copied from there into the
.Sy X/Open System Interfaces
.Pq Tn XSI
option of
.St -p1003.1-2001 .
.Sh HISTORY
The
.Fn sigpause
function appeared in
.Bx 4.2
and has been deprecated.
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