39 lines
1 KiB
Groff
39 lines
1 KiB
Groff
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.\" Copyright (c) 1980 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)alarm.3c 6.3 (Berkeley) 5/27/86
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.\"
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.TH ALARM 2 "May 27, 1986"
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.UC 4
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.SH NAME
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alarm \- schedule signal after specified time
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.SH SYNOPSIS
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.nf
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.ft B
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#include <unistd.h>
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unsigned int alarm(unsigned int \fIseconds\fP)
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.ft R
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.fi
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.SH DESCRIPTION
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.B Alarm
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causes signal SIGALRM, see
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.BR sigaction (2),
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to be sent to the invoking process
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in a number of seconds given by the argument.
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Unless caught or ignored, the signal terminates the process.
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.PP
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Alarm requests are not stacked; successive calls reset the alarm clock.
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If the argument is 0, any alarm request is canceled.
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Because of scheduling delays,
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resumption of execution of when the signal is
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caught may be delayed an arbitrary amount.
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.PP
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The return value is the amount of time previously remaining in the alarm clock.
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.SH "SEE ALSO"
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.BR pause (2),
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.BR sigsuspend (2),
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.BR sigaction (2),
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.BR sleep (3).
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