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Diffstat (limited to 'librols/usleep.c')
| -rw-r--r-- | librols/usleep.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/librols/usleep.c b/librols/usleep.c new file mode 100644 index 0000000..780f7e3 --- /dev/null +++ b/librols/usleep.c @@ -0,0 +1,139 @@ +/* + * This file has been modified for the cdrkit suite. + * + * The behaviour and appearence of the program code below can differ to a major + * extent from the version distributed by the original author(s). + * + * For details, see Changelog file distributed with the cdrkit package. If you + * received this file from another source then ask the distributing person for + * a log of modifications. + * + */ + +/* @(#)usleep.c 1.17 03/06/15 Copyright 1995-2003 J. Schilling */ +/* + * Copyright (c) 1995-2003 J. Schilling + */ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <mconfig.h> +#define usleep __nothing_ /* prototype in unistd.h may be different */ +#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> +#undef 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. + * SCO has a usleep() prototype in unistd.h, for this reason we + * #define usleep to __nothing__ before including unistd.h + */ +#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 |