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131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/* Emacs style mode select -*- C++ -*-
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*-----------------------------------------------------------------------------
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*
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*
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* PrBoom: a Doom port merged with LxDoom and LSDLDoom
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* based on BOOM, a modified and improved DOOM engine
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* Copyright (C) 1999 by
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* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
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* Copyright (C) 1999-2006 by Colin Phipps, Florian Schulze
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*
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* Copyright 2005, 2006 by
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* Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* DESCRIPTION:
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* Misc system stuff needed by Doom, implemented for POSIX systems.
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* Timers and signals.
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*
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*-----------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <signal.h>
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#include "doomtype.h"
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#include "m_fixed.h"
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#include "i_system.h"
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#include "doomdef.h"
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#ifdef __GNUG__
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#pragma implementation "i_system.h"
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#endif
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#include "i_system.h"
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void I_uSleep(unsigned long usecs)
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{
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#ifdef HAVE_USLEEP
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usleep(usecs);
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#else
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/* Fall back on select(2) */
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struct timeval tv = { usecs / 1000000, usecs % 1000000 };
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select(0,NULL,NULL,NULL,&tv);
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#endif
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}
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/* CPhipps - believe it or not, it is possible with consecutive calls to
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* gettimeofday to receive times out of order, e.g you query the time twice and
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* the second time is earlier than the first. Cheap'n'cheerful fix here.
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* NOTE: only occurs with bad kernel drivers loaded, e.g. pc speaker drv
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*/
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static unsigned long lasttimereply;
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static unsigned long basetime;
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int I_GetTime_RealTime (void)
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{
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struct timeval tv;
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struct timezone tz;
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unsigned long thistimereply;
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gettimeofday(&tv, &tz);
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thistimereply = (tv.tv_sec * TICRATE + (tv.tv_usec * TICRATE) / 1000000);
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/* Fix for time problem */
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if (!basetime) {
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basetime = thistimereply; thistimereply = 0;
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} else thistimereply -= basetime;
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if (thistimereply < lasttimereply)
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thistimereply = lasttimereply;
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return (lasttimereply = thistimereply);
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}
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/*
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* I_GetRandomTimeSeed
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*
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* CPhipps - extracted from G_ReloadDefaults because it is O/S based
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*/
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unsigned long I_GetRandomTimeSeed(void)
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{
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/* killough 3/26/98: shuffle random seed, use the clock */
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struct timeval tv;
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struct timezone tz;
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gettimeofday(&tv,&tz);
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return (tv.tv_sec*1000ul + tv.tv_usec/1000ul);
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}
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/* cphipps - I_GetVersionString
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* Returns a version string in the given buffer
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*/
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const char* I_GetVersionString(char* buf, size_t sz)
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{
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snprintf(buf,sz,"LxDoom v%s (http://lxdoom.linuxgames.com/)",VERSION);
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return buf;
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}
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/* cphipps - I_SigString
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* Returns a string describing a signal number
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*/
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const char* I_SigString(char* buf, size_t sz, int signum)
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{
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#ifdef SYS_SIGLIST_DECLARED
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if (strlen(sys_siglist[signum]) < sz)
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strcpy(buf,sys_siglist[signum]);
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else
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#endif
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sprintf(buf,"signal %d",signum);
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return buf;
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}
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