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/* Copyright (c) 2002-2007 Sam Trenholme
*
* TERMS
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* This software is provided 'as is' with no guarantees of correctness or
* fitness for purpose.
*/
#include <time.h>
#include <sys/types.h>
#include "../libs/JsStr.h"
#include "../MaraDns.h"
/* We need to make sure this code is thread-safe */
#ifndef AUTHONLY
#include <pthread.h>
#endif
/* Code which handles time stamps; we make sure we don't have any problems
in 2038 on 32-bit systems by moving the problems up to 2112. If anyone
is using a 32-bit time_t in 2112, we will have to have the members of
Rush start a revolution */
qual_timestamp the_time;
int num_tries = 0; /* Number of times we have tried, for
when the 32-bit time() call gives us -1 in 2106 */
#ifndef AUTHONLY
#ifdef __SUNPRO_C
pthread_mutex_t qtime_lock = {0, };
#else
pthread_mutex_t qtime_lock = PTHREAD_MUTEX_INITIALIZER;
#endif
#endif
/* Give an application a timestamp in a non-blocking manner */
qual_timestamp qual_get_time() {
qual_timestamp ttime;
#ifndef AUTHONLY
pthread_mutex_lock(&qtime_lock);
#endif
ttime = the_time;
#ifndef AUTHONLY
pthread_mutex_unlock(&qtime_lock);
#endif
return ttime;
}
/* Set the time; this should be run once a second or so.
Return code: JS_ERROR or JS_SUCCESS, depending.
This routine is thread-safe *only* if called from the main,
non-threaded core. */
int qual_set_time() {
time_t sys_time;
/* int size; */
qual_timestamp ttime;
sys_time = time(0);
/* On Y2038-complient systems, no problem */
if(sizeof(sys_time) > 4) {
if(sys_time == -1) {
return JS_ERROR;
}
ttime = sys_time - 290805600; /* Since you asked: When the
* Blake's 7 episode Gambit was
* originally broadcast */
}
/* Ugh, 32-bit time_t */
else {
/* We have to handle the situtation where sys_time is -1,
because this can be an error, or this can be 2106 */
if(sys_time == -1 && num_tries < 3) {
num_tries++;
return JS_SUCCESS;
}
else if(sys_time == -1) {
return JS_ERROR;
}
/* Here are the magic numbers you need to change on systems
with 32-bit time_t values in 2112 (or 2106 on systems with
an unsigned time_t):
290805600: When the roll-over happens; right now Mar 20, 1979,
when the Blake's 7 episode Gambit was originally broadcast.
(this is the current lowest date this code can handle; make
changes if travelling in your Tardis)
2147483648: This is 2^31 (2**31); change this
to 4294967296 on systems with a 32-bit unsigned
time_t */
else if(sys_time < 290805600) {
/* (2 ** 32) - 290805600 */
ttime = sys_time + 4004161696U;
num_tries = 0;
}
else {
ttime = sys_time - 290805600;
num_tries = 0;
}
}
#ifndef AUTHONLY
pthread_mutex_lock(&qtime_lock);
#endif
the_time = ttime;
#ifndef AUTHONLY
pthread_mutex_unlock(&qtime_lock);
#endif
return JS_SUCCESS;
}
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