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/* ufuncs - sleep and alarm functions that understand fractional values */
/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "bashtypes.h"
#if defined (TIME_WITH_SYS_TIME)
# include <sys/time.h>
# include <time.h>
#else
# if defined (HAVE_SYS_TIME_H)
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if defined (HAVE_UNISTD_H)
#include <unistd.h>
#endif
/* A version of `alarm' using setitimer if it's available. */
#if defined (HAVE_SETITIMER)
unsigned int
falarm(secs, usecs)
unsigned int secs, usecs;
{
struct itimerval it, oit;
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
it.it_value.tv_sec = secs;
it.it_value.tv_usec = usecs;
if (setitimer(ITIMER_REAL, &it, &oit) < 0)
return (-1);
/* Backwards compatibility with alarm(3) */
if (oit.it_value.tv_usec)
oit.it_value.tv_sec++;
return (oit.it_value.tv_sec);
}
#else
int
falarm (secs, usecs)
unsigned int secs, usecs;
{
if (secs == 0 && usecs == 0)
return (alarm (0));
if (secs == 0 || usecs >= 500000)
{
secs++;
usecs = 0;
}
return (alarm (secs));
}
#endif /* !HAVE_SETITIMER */
/* A version of sleep using fractional seconds and select. I'd like to use
`usleep', but it's already taken */
#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)
int
fsleep(sec, usec)
unsigned int sec, usec;
{
struct timeval tv;
tv.tv_sec = sec;
tv.tv_usec = usec;
return select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
}
#else /* !HAVE_TIMEVAL || !HAVE_SELECT */
int
fsleep(sec, usec)
long sec, usec;
{
if (usec >= 500000) /* round */
sec++;
return (sleep(sec));
}
#endif /* !HAVE_TIMEVAL || !HAVE_SELECT */
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