108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/* ufuncs - sleep and alarm functions that understand fractional values */
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/* Copyright (C) 2008,2009 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "bashtypes.h"
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#if defined (TIME_WITH_SYS_TIME)
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# include <sys/time.h>
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# include <time.h>
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#else
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# if defined (HAVE_SYS_TIME_H)
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#if defined (HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#if defined (HAVE_SELECT)
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# include "posixselect.h"
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#endif
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/* A version of `alarm' using setitimer if it's available. */
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#if defined (HAVE_SETITIMER)
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unsigned int
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falarm(secs, usecs)
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unsigned int secs, usecs;
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{
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struct itimerval it, oit;
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it.it_interval.tv_sec = 0;
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it.it_interval.tv_usec = 0;
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it.it_value.tv_sec = secs;
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it.it_value.tv_usec = usecs;
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if (setitimer(ITIMER_REAL, &it, &oit) < 0)
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return (-1); /* XXX will be converted to unsigned */
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/* Backwards compatibility with alarm(3) */
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if (oit.it_value.tv_usec)
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oit.it_value.tv_sec++;
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return (oit.it_value.tv_sec);
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}
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#else
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int
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falarm (secs, usecs)
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unsigned int secs, usecs;
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{
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if (secs == 0 && usecs == 0)
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return (alarm (0));
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if (secs == 0 || usecs >= 500000)
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{
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secs++;
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usecs = 0;
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}
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return (alarm (secs));
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}
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#endif /* !HAVE_SETITIMER */
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/* A version of sleep using fractional seconds and select. I'd like to use
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`usleep', but it's already taken */
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#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)
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int
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fsleep(sec, usec)
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unsigned int sec, usec;
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{
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struct timeval tv;
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tv.tv_sec = sec;
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tv.tv_usec = usec;
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return select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
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}
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#else /* !HAVE_TIMEVAL || !HAVE_SELECT */
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int
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fsleep(sec, usec)
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long sec, usec;
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{
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if (usec >= 500000) /* round */
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sec++;
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return (sleep(sec));
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}
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#endif /* !HAVE_TIMEVAL || !HAVE_SELECT */
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