1.\" $OpenBSD: pause.3,v 1.17 2022/12/30 21:21:25 cheloha 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: December 30 2022 $ 31.Dt PAUSE 3 32.Os 33.Sh NAME 34.Nm pause 35.Nd wait for a signal 36.Sh SYNOPSIS 37.In unistd.h 38.Ft int 39.Fn pause void 40.Sh DESCRIPTION 41.Bf -symbolic 42.Fn pause 43is obsoleted by 44.Xr sigsuspend 2 . 45.Ef 46.Pp 47.Fn pause 48blocks the calling thread until it receives an unmasked signal. 49.Sh RETURN VALUES 50.Fn pause 51always returns \-1. 52.Sh ERRORS 53.Fn pause 54always sets 55.Xr errno 2 56to the following value: 57.Bl -tag -width Er 58.It Bq Er EINTR 59The call was interrupted by a signal. 60.El 61.Sh SEE ALSO 62.Xr kill 2 , 63.Xr setitimer 2 , 64.Xr sigprocmask 2 , 65.Xr sigsuspend 2 , 66.Xr signal 3 67.Sh HISTORY 68A 69.Fn pause 70system call first appeared outside of Bell Labs in the 71.Dq 50 changes 72tape for 73.At v6 . 74It was first officially released with PWB/UNIX 1.0. 75It was reimplemented as a wrapper around the 76.Fn sigpause 77and 78.Fn sigblock 79system calls in 80.Bx 4.2 , 81and around the 82.Xr sigsuspend 2 83and 84.Xr sigprocmask 2 85system calls in 86.Bx 4.3 Reno . 87