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41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/time.h>
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#include <unistd.h>
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/* Set an alarm to go off (generating a SIGALRM signal) in VALUE microseconds.
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If INTERVAL is nonzero, when the alarm goes off, the timer is reset to go
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off every INTERVAL microseconds thereafter.
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Returns the number of microseconds remaining before the alarm. */
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useconds_t
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ualarm (useconds_t value, useconds_t interval)
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{
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struct itimerval timer, otimer;
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timer.it_value.tv_sec = 0;
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timer.it_value.tv_usec = value;
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timer.it_interval.tv_sec = 0;
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timer.it_interval.tv_usec = interval;
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if (__setitimer (ITIMER_REAL, &timer, &otimer) < 0)
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return -1;
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return (otimer.it_value.tv_sec * 1000000) + otimer.it_value.tv_usec;
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}
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