158f0484fSRodney W. Grimes.\" Copyright (c) 1980, 1991, 1993, 1994 258f0484fSRodney W. Grimes.\" The Regents of the University of California. All rights reserved. 358f0484fSRodney W. Grimes.\" 458f0484fSRodney W. Grimes.\" Redistribution and use in source and binary forms, with or without 558f0484fSRodney W. Grimes.\" modification, are permitted provided that the following conditions 658f0484fSRodney W. Grimes.\" are met: 758f0484fSRodney W. Grimes.\" 1. Redistributions of source code must retain the above copyright 858f0484fSRodney W. Grimes.\" notice, this list of conditions and the following disclaimer. 958f0484fSRodney W. Grimes.\" 2. Redistributions in binary form must reproduce the above copyright 1058f0484fSRodney W. Grimes.\" notice, this list of conditions and the following disclaimer in the 1158f0484fSRodney W. Grimes.\" documentation and/or other materials provided with the distribution. 12fbbd9655SWarner Losh.\" 3. Neither the name of the University nor the names of its contributors 1358f0484fSRodney W. Grimes.\" may be used to endorse or promote products derived from this software 1458f0484fSRodney W. Grimes.\" without specific prior written permission. 1558f0484fSRodney W. Grimes.\" 1658f0484fSRodney W. Grimes.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1758f0484fSRodney W. Grimes.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1858f0484fSRodney W. Grimes.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1958f0484fSRodney W. Grimes.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2058f0484fSRodney W. Grimes.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2158f0484fSRodney W. Grimes.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2258f0484fSRodney W. Grimes.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2358f0484fSRodney W. Grimes.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2458f0484fSRodney W. Grimes.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2558f0484fSRodney W. Grimes.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2658f0484fSRodney W. Grimes.\" SUCH DAMAGE. 2758f0484fSRodney W. Grimes.\" 28*4b7f35dbSGordon Bergling.Dd April 2, 2022 2958f0484fSRodney W. Grimes.Dt ALARM 3 30a307d598SRuslan Ermilov.Os 3158f0484fSRodney W. Grimes.Sh NAME 3258f0484fSRodney W. Grimes.Nm alarm 3358f0484fSRodney W. Grimes.Nd set signal timer alarm 3425bb73e0SAlexey Zelkin.Sh LIBRARY 3525bb73e0SAlexey Zelkin.Lb libc 3658f0484fSRodney W. Grimes.Sh SYNOPSIS 3732eef9aeSRuslan Ermilov.In unistd.h 38b4176c89SMike Pritchard.Ft unsigned int 39b4176c89SMike Pritchard.Fn alarm "unsigned int seconds" 4058f0484fSRodney W. Grimes.Sh DESCRIPTION 4158f0484fSRodney W. Grimes.Bf -symbolic 426575e6daSRuslan ErmilovThis interface is made obsolete by 436575e6daSRuslan Ermilov.Xr setitimer 2 . 4458f0484fSRodney W. Grimes.Ef 4558f0484fSRodney W. Grimes.Pp 4658f0484fSRodney W. GrimesThe 4758f0484fSRodney W. Grimes.Fn alarm 48b4176c89SMike Pritchardfunction sets a timer to deliver the signal 49b4176c89SMike Pritchard.Dv SIGALRM 50b4176c89SMike Pritchardto the calling process after the specified number of 51b4176c89SMike Pritchard.Fa seconds . 52b4176c89SMike PritchardIf an alarm has already been set with 5358f0484fSRodney W. Grimes.Fn alarm 54b4176c89SMike Pritchardbut has not been delivered, another call to 5558f0484fSRodney W. Grimes.Fn alarm 5658f0484fSRodney W. Grimeswill supersede the prior call. 5758f0484fSRodney W. GrimesThe request 5858f0484fSRodney W. Grimes.Fn alarm "0" 5958f0484fSRodney W. Grimesvoids the current 60067fe639SAndrey A. Chernovalarm and the signal SIGALRM will not be delivered. 61067fe639SAndrey A. Chernov.Pp 62067fe639SAndrey A. ChernovDue to 63067fe639SAndrey A. Chernov.Xr setitimer 2 64067fe639SAndrey A. Chernovrestriction the maximum number of 655c564baeSRuslan Ermilov.Fa seconds 66067fe639SAndrey A. Chernovallowed is 100000000. 67067fe639SAndrey A. Chernov.Sh RETURN VALUES 68b4176c89SMike PritchardThe return value of 69b4176c89SMike Pritchard.Fn alarm 70b4176c89SMike Pritchardis the amount of time left on the timer from a previous call to 71b4176c89SMike Pritchard.Fn alarm . 72b4176c89SMike PritchardIf no alarm is currently set, the return value is 0. 7358f0484fSRodney W. Grimes.Sh SEE ALSO 7458f0484fSRodney W. Grimes.Xr setitimer 2 , 7575141cc9SWolfram Schneider.Xr sigaction 2 , 76c84cab56SJilles Tjoelker.Xr sigsuspend 2 , 7758f0484fSRodney W. Grimes.Xr signal 3 , 7858f0484fSRodney W. Grimes.Xr sleep 3 , 7958f0484fSRodney W. Grimes.Xr ualarm 3 , 8058f0484fSRodney W. Grimes.Xr usleep 3 8153cd6483SMike Pritchard.\" .Sh STANDARDS 8253cd6483SMike Pritchard.\" The 8353cd6483SMike Pritchard.\" .Fn alarm 8453cd6483SMike Pritchard.\" function conforms to 8553cd6483SMike Pritchard.\" .St -p1003.1-90 . 8658f0484fSRodney W. Grimes.Sh HISTORY 8758f0484fSRodney W. GrimesAn 8858f0484fSRodney W. Grimes.Fn alarm 89*4b7f35dbSGordon Berglingsystem call appeared in the Programmer's Workbench (PWB/UNIX) 90*4b7f35dbSGordon Berglingand was ported to 9158f0484fSRodney W. Grimes.At v7 . 92*4b7f35dbSGordon BerglingFor 93*4b7f35dbSGordon Bergling.Bx 4.1c , 94*4b7f35dbSGordon Berglingit was reimplemented as a wrapper around the 95*4b7f35dbSGordon Bergling.Xr setitimer 2 96*4b7f35dbSGordon Berglingsystem call. 97