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/* Pausing execution of the current thread.
Copyright (C) 2009-2017 Free Software Foundation, Inc.
Written by Eric Blake <ebb9@byu.net>, 2009.
This program 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.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* This file is _intentionally_ light-weight. Rather than using
select or nanosleep, both of which drag in external libraries on
some platforms, this merely rounds up to the nearest second if
usleep() does not exist. If sub-second resolution is important,
then use a more powerful interface to begin with. */
#include <config.h>
/* Specification. */
#include <unistd.h>
#include <errno.h>
#ifndef HAVE_USLEEP
# define HAVE_USLEEP 0
#endif
/* Sleep for MICRO microseconds, which can be greater than 1 second.
Return -1 and set errno to EINVAL on range error (about 4295
seconds), or 0 on success. Interaction with SIGALARM is
unspecified. */
int
usleep (useconds_t micro)
{
unsigned int seconds = micro / 1000000;
if (sizeof seconds < sizeof micro && micro / 1000000 != seconds)
{
errno = EINVAL;
return -1;
}
if (!HAVE_USLEEP && micro % 1000000)
seconds++;
while ((seconds = sleep (seconds)) != 0);
#undef usleep
#if !HAVE_USLEEP
# define usleep(x) 0
#endif
return usleep (micro % 1000000);
}
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