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deb-mbse/lib/timers.c

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/*****************************************************************************
*
* $Id$
* Purpose ...............: General Purpose Timers
*
*****************************************************************************
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* Copyright (C) 1997-2004
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*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS 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.
*
* MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
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#include "mbselib.h"
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/*
* Number of timers
*/
#define GENTIMERS 3
static time_t gentimer[GENTIMERS];
/*
* Reset a timer
*/
int gpt_resettimer(int tno)
{
if (tno >= GENTIMERS) {
errno = EINVAL;
WriteError("invalid timer number for gpt_resettimer(%d)", tno);
return -1;
}
gentimer[tno] = (time_t) 0;
return 0;
}
void gpt_resettimers(void)
{
int i;
for (i = 0; i < GENTIMERS; i++)
gpt_resettimer(i);
}
/*
* Set timer
*/
int gpt_settimer(int tno, int interval)
{
if (tno >= GENTIMERS) {
errno = EINVAL;
WriteError("invalid timer number for gpt_settimer(%d)", tno);
return -1;
}
gentimer[tno] = time((time_t*)NULL) + interval;
return 0;
}
/*
* Check if timer is expired
*/
int gpt_expired(int tno)
{
time_t now;
if (tno >= GENTIMERS) {
errno = EINVAL;
WriteError("invalid timer number for gpt_expired(%d)", tno);
return -1;
}
/*
* Check if timer is running
*/
if (gentimer[tno] == (time_t) 0)
return 0;
now = time(NULL);
return (now >= gentimer[tno]);
}
int gpt_running(int tno)
{
if (tno >= GENTIMERS) {
errno = EINVAL;
WriteError("invalid timer number for gpt_running(%d)", tno);
return -1;
}
if (gentimer[tno] == (time_t) 0)
return 0;
else
return 1;
}
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/*
* Milliseconds timer, returns 0 on success.
*/
int msleep(int msecs)
{
int rc;
struct timespec req, rem;
rem.tv_sec = 0;
rem.tv_nsec = 0;
req.tv_sec = msecs / 1000;
req.tv_nsec = (msecs % 1000) * 1000000;
while (TRUE) {
rc = nanosleep(&req, &rem);
if (rc == 0)
break;
if ((errno == EINVAL) || (errno == EFAULT)) {
WriteError("$msleep(%d)", msecs);
break;
}
/*
* Error was EINTR, run timer again to complete.
*/
req.tv_sec = rem.tv_sec;
req.tv_nsec = rem.tv_nsec;
rem.tv_sec = 0;
rem.tv_nsec = 0;
}
return rc;
}