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/* vim:ts=4:sts=4:sw=4:et:cindent
* datefudge.c: Twist system date back N seconds
*
* Copyright (C) 2001-2003, Matthias Urlichs <smurf@noris.de>
* Copyright (C) 2008-2011, Robert Luberda <robert@debian.org>
*
*/
#define _GNU_SOURCE
#include <sys/file.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <assert.h>
#include <features.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
static int fudge = 0;
static int dostatic = 0;
static void init_fudge (void) {
const char *fud;
if(fudge)return;
fud = getenv("DATEFUDGE");
if(fud == NULL) return;
fudge = atoi(fud);
dostatic = getenv("DATEFUDGE_DOSTATIC") != NULL;
}
static void set_fudge(time_t *seconds)
{
if (!seconds)
return;
init_fudge();
if (dostatic)
*seconds = fudge;
else
*seconds -= fudge;
}
/*
* This won't work...
*
text_set_element (__libc_subinit, init_logger);
*/
time_t time(time_t *x) {
static time_t (*libc_time)(time_t *) = NULL;
time_t res;
if(!libc_time)
libc_time = (typeof(libc_time))dlsym (RTLD_NEXT, __func__);
res = (*libc_time)(x);
set_fudge(x);
set_fudge(&res);
return res;
}
int __gettimeofday(struct timeval *x, struct timezone *y) {
static int (*libc_gettimeofday)(struct timeval *, struct timezone *) = NULL;
int res;
if(!libc_gettimeofday)
libc_gettimeofday = (typeof(libc_gettimeofday))dlsym (RTLD_NEXT, __func__);
res = (*libc_gettimeofday)(x,y);
if(res) return res;
set_fudge(&x->tv_sec);
return 0;
}
int gettimeofday(struct timeval *x, struct timezone *y) {
return __gettimeofday(x,y);
}
#ifndef __GNU__
int clock_gettime(clockid_t x, struct timespec *y) {
static int (*libc_clock_gettime)(clockid_t, struct timespec*);
int res;
if (!libc_clock_gettime)
libc_clock_gettime = (typeof(libc_clock_gettime))dlsym (RTLD_NEXT, __func__);
res = (*libc_clock_gettime)(x,y);
if (res || CLOCK_REALTIME != x) return res;
set_fudge(&y->tv_sec);
return 0;
}
#endif
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