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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/tm/tvsleep.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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#include <tv.h>

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#include <tm.h>

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#include "FEATURE/tvlib"

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#if !_lib_nanosleep

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# if _lib_select

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#  if _sys_select

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#   include <sys/select.h>

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#  else

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#   include <sys/socket.h>

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#  endif

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# else

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#  if !_lib_usleep

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#   if _lib_poll_notimer

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#    undef _lib_poll

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#   endif

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#   if _lib_poll

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#    include <poll.h>

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#   endif

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#  endif

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# endif

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#endif

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/*

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 * sleep for tv

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 * non-zero exit if sleep did not complete

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 * with remaining time in rv

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 */

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int

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tvsleep(register const Tv_t* tv, register Tv_t* rv)

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{

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#if _lib_nanosleep

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	struct timespec	stv;

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	struct timespec	srv;

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	int		r;

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	stv.tv_sec = tv->tv_sec;

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	stv.tv_nsec = tv->tv_nsec;

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	if ((r = nanosleep(&stv, &srv)) && rv)

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	{

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		rv->tv_sec = srv.tv_sec;

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		rv->tv_nsec = srv.tv_nsec;

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	}

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	return r;

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#else

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#if _lib_select

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	struct timeval	stv;

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	stv.tv_sec = tv->tv_sec;

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	stv.tv_usec = tv->tv_nsec / 1000;

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	if (select(0, NiL, NiL, NiL, &stv) < 0)

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	{

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		if (rv)

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			*rv = *tv;

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		return -1;

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	}

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	if (rv)

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	{

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		rv->tv_sec = stv.tv_sec;

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		rv->tv_nsec = stv.tv_usec * 1000;

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	}

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	return 0;

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#else

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	unsigned int		s = tv->tv_sec;

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	uint32_t		n = tv->tv_nsec;

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#if _lib_usleep

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	unsigned long		t;

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	if (t = (n + 999L) / 1000L)

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	{

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		usleep(t);

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		s -= t / 1000000L;

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		n = 0;

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	}

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#else

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#if _lib_poll

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	struct pollfd		pfd;

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	int			t;

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	if ((t = (n + 999999L) / 1000000L) > 0)

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	{

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		poll(&pfd, 0, t);

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		s -= t / 1000L;

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		n = 0;

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	}

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#endif

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#endif

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	if ((s += (n + 999999999L) / 1000000000L) && (s = sleep(s)))

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	{

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		if (rv)

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		{

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			rv->tv_sec = s;

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			rv->tv_nsec = 0;

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		}

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		return -1;

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	}

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	return 0;

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#endif

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#endif

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}

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