1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd April 3, 2022 29.Dt PAUSE 3 30.Os 31.Sh NAME 32.Nm pause 33.Nd stop until signal 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In unistd.h 38.Ft int 39.Fn pause void 40.Sh DESCRIPTION 41.Sy Pause is made obsolete by 42.Xr sigsuspend 2 . 43.Pp 44The 45.Fn pause 46function 47forces a process to pause until 48a signal is received from either the 49.Xr kill 2 50function 51or an interval timer. 52(See 53.Xr setitimer 2 . ) 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 65always returns: 66.Bl -tag -width Er 67.It Bq Er EINTR 68The call was interrupted. 69.El 70.Sh SEE ALSO 71.Xr kill 2 , 72.Xr select 2 , 73.Xr sigsuspend 2 74.Sh HISTORY 75A 76.Fn pause 77system call first appeared in the Programmer's Workbench (PWB/UNIX) 78and was then ported to 79.At v7 . 80It was reimplemeted as a wrapper around the 81.Fn sigpause 82and 83.Fn sigblock 84system calls in 85.Bx 4.2 , 86and around the 87.Xr sigsuspend 2 88and 89.Xr sigprocmask 2 90system calls in 91.Bx 4.3 Reno . 92