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| 1 | .\" Copyright (c) 1980 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)alarm.3c 6.3 (Berkeley) 5/27/86
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| 6 | .\"
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| 7 | .TH ALARM 2 "May 27, 1986"
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| 8 | .UC 4
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| 9 | .SH NAME
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| 10 | alarm \- schedule signal after specified time
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | #include <unistd.h>
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| 15 |
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| 16 | unsigned int alarm(unsigned int \fIseconds\fP)
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| 17 | .ft R
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| 18 | .fi
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| 19 | .SH DESCRIPTION
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| 20 | .B Alarm
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| 21 | causes signal SIGALRM, see
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| 22 | .BR sigaction (2),
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| 23 | to be sent to the invoking process
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| 24 | in a number of seconds given by the argument.
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| 25 | Unless caught or ignored, the signal terminates the process.
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| 26 | .PP
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| 27 | Alarm requests are not stacked; successive calls reset the alarm clock.
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| 28 | If the argument is 0, any alarm request is canceled.
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| 29 | Because of scheduling delays,
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| 30 | resumption of execution of when the signal is
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| 31 | caught may be delayed an arbitrary amount.
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| 32 | .PP
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| 33 | The return value is the amount of time previously remaining in the alarm clock.
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| 34 | .SH "SEE ALSO"
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| 35 | .BR pause (2),
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| 36 | .BR sigsuspend (2),
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| 37 | .BR sigaction (2),
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| 38 | .BR sleep (3).
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