/*
 * Copyright (c) 2006 Sendmail, Inc. and its suppliers.
 *	All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 */

#include "sm/generic.h"
SM_RCSID("@(#)$Id: us_sleep.c,v 1.3 2006/11/18 15:19:42 ca Exp $")
#include "sm/assert.h"
#include "sm/error.h"
#include "sm/misc.h"

/*
**  SM_US_SLEEP -- sleep() for some microseconds
**
**	Parameters:
**		us -- microseconds to sleep
**
**	Returns:
**		usual return code
*/

sm_ret_T
sm_us_sleep(long us)
{
	int r;
#if HAVE_NANOSLEEP
	struct timespec sl_ts;

	sl_ts.tv_sec = 0;
	sl_ts.tv_nsec = us * 100;
	r = nanosleep(&sl_ts, NULL);
#elif HAVE_SELECT
	struct timeval sl_tv;

	sl_tv.tv_sec = 0;
	sl_tv.tv_usec = us;
	r = select(0, NULL, NULL, NULL, &sl_tv);
#else
#ifdef ENOIMPL
	r = sm_err_perm(ENOIMPL);
#else
	r = sm_err_perm(ENOSYS);
#endif
#endif
	return r;
}