1.\" $OpenBSD: pause.3,v 1.14 2015/09/23 08:52:56 sobrado Exp $ 2.\" 3.\" Copyright (c) 1980, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd $Mdocdate: September 23 2015 $ 31.Dt PAUSE 3 32.Os 33.Sh NAME 34.Nm pause 35.Nd stop until signal 36.Sh SYNOPSIS 37.In unistd.h 38.Ft int 39.Fn pause void 40.Sh DESCRIPTION 41.Bf -symbolic 42Pause is made obsolete by 43.Xr sigsuspend 2 . 44.Ef 45.Pp 46The 47.Fn pause 48function forces a process to pause until a signal is received from either the 49.Xr kill 2 50function or an interval timer 51(see 52.Xr setitimer 2 ) . 53.Pp 54Upon termination of a signal handler started during a 55.Fn pause , 56the 57.Fn pause 58call will return. 59.Sh RETURN VALUES 60Always returns \-1. 61.Sh ERRORS 62The 63.Fn pause 64function may set the global variable 65.Va errno 66to the following error: 67.Bl -tag -width Er 68.It Bq Er EINTR 69The call was interrupted. 70.El 71.Sh SEE ALSO 72.Xr kill 2 , 73.Xr select 2 , 74.Xr setitimer 2 , 75.Xr sigsuspend 2 76.Sh HISTORY 77A 78.Fn pause 79system call first appeared in the Programmer's Workbench (PWB/UNIX) 80and was then ported to 81.At v7 . 82It was reimplemented as a wrapper around the 83.Fn sigpause 84and 85.Fn sigblock 86system calls in 87.Bx 4.2 , 88and around the 89.Xr sigsuspend 2 90and 91.Xr sigprocmask 2 92system calls in 93.Bx 4.3 Reno . 94