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/* @(#)usleep.c 1.15 01/01/07 Copyright 1995 J. Schilling */
#ifndef lint
static char sccsid[] =
"@(#)usleep.c 1.15 01/01/07 Copyright 1995 J. Schilling";
#endif
/*
* Copyright (c) 1995 J. Schilling
*/
/*
* 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 2, 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <mconfig.h>
#include <standard.h>
#include <stdxlib.h>
#include <timedefs.h>
#ifdef HAVE_POLL_H
# include <poll.h>
#else
# ifdef HAVE_SYS_POLL_H
# include <sys/poll.h>
# endif
#endif
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif
#include <libport.h>
/*
* SCO has a usleep() prototype in unistd.h
* So we put this prototype before the #undef HAVE_USLEEP
*/
#ifndef HAVE_USLEEP
EXPORT int usleep __PR((int usec));
#endif
#ifdef OPENSERVER
/*
* Don't use the usleep() from libc on SCO's OPENSERVER.
* It will kill our processes with SIGALRM.
*/
#undef HAVE_USLEEP
#endif
#ifdef apollo
/*
* Apollo sys5.3 usleep is broken. Define a version based on time_$wait.
*/
#include <apollo/base.h>
#include <apollo/time.h>
#undef HAVE_USLEEP
#endif
#if !defined(HAVE_USLEEP)
EXPORT int
usleep(usec)
int usec;
{
#if defined(apollo)
/*
* Need to check apollo before HAVE_SELECT, because Apollo has select,
* but it's time wait feature is also broken :-(
*/
#define HAVE_USLEEP
/*
* XXX Do these vars need to be static on Domain/OS ???
*/
static time_$clock_t DomainDelay;
static status_$t DomainStatus;
/*
* DomainDelay is a 48 bit value that defines how many 4uS periods to
* delay. Since the input value range is 32 bits, the upper 16 bits of
* DomainDelay must be zero. So we just divide the input value by 4 to
* determine how many "ticks" to wait
*/
DomainDelay.c2.high16 = 0;
DomainDelay.c2.low32 = usec / 4;
time_$wait (time_$relative, DomainDelay, &DomainStatus);
#endif /* Apollo */
#if defined(HAVE_SELECT) && !defined(HAVE_USLEEP)
#define HAVE_USLEEP
struct timeval tv;
tv.tv_sec = usec / 1000000;
tv.tv_usec = usec % 1000000;
select(0, 0, 0, 0, &tv);
#endif
#if defined(HAVE_POLL) && !defined(HAVE_USLEEP)
#define HAVE_USLEEP
if (poll(0, 0, usec/1000) < 0)
comerr("poll delay failed.\n");
#endif
#if defined(HAVE_NANOSLEEP) && !defined(HAVE_USLEEP)
#define HAVE_USLEEP
struct timespec ts;
ts.tv_sec = usec / 1000000;
ts.tv_nsec = (usec % 1000000) * 1000;
nanosleep(&ts, 0);
#endif
#if !defined(HAVE_USLEEP)
#define HAVE_USLEEP
sleep((usec+500000)/1000000);
#endif
return (0);
}
#endif
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