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/* vim:ts=2:sts=2:sw=2:et:cindent
*
* datefudge.c: Twist system date back N seconds
*
* Copyright (C) 2001-2003, Matthias Urlichs <smurf@noris.de>
* Copyright (C) 2008-2024, Robert Luberda <robert@debian.org>
*
*/
#define _GNU_SOURCE
#include <assert.h>
#include <dlfcn.h>
#include <fcntl.h>
#include <features.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
static time_t fudge = 0;
static bool dostatic = false;
static bool fudge_set = false;
static void init_fudge(void) {
const char *const fud = getenv("DATEFUDGE");
if (fud == NULL)
return;
if (sizeof(time_t) <= sizeof(int))
fudge = atoi(fud);
else
fudge = atoll(fud);
dostatic = getenv("DATEFUDGE_DOSTATIC") != NULL;
fudge_set = true;
}
static void set_fudge(time_t *seconds) {
if (!seconds)
return;
if (!fudge_set)
init_fudge();
if (dostatic)
*seconds = fudge;
else
*seconds -= fudge;
}
/* Note: a macro, because subseconds can be timeval.tv_usec or timespec.tv_nsec,
* that might be of different types */
#define SET_FUDGE_WITH_SUBSECS(seconds, subseconds) \
do { \
set_fudge(&seconds); \
if (dostatic) \
subseconds = 0; \
} while (false)
time_t time(time_t *tloc) {
static time_t (*libc_time)(time_t *) = NULL;
if (!libc_time)
libc_time = (typeof(libc_time))dlsym(RTLD_NEXT, __func__);
time_t res = (*libc_time)(tloc);
set_fudge(tloc);
set_fudge(&res);
return res;
}
int gettimeofday(struct timeval *tv, void *tz) {
static int (*libc_gettimeofday)(struct timeval *, void *) = NULL;
if (!libc_gettimeofday)
libc_gettimeofday = (typeof(libc_gettimeofday))dlsym(RTLD_NEXT, __func__);
const int res = (*libc_gettimeofday)(tv, tz);
if (res)
return res;
SET_FUDGE_WITH_SUBSECS(tv->tv_sec, tv->tv_usec);
return 0;
}
int clock_gettime(clockid_t clockid, struct timespec *tp) {
static int (*libc_clock_gettime)(clockid_t, struct timespec *) = NULL;
if (!libc_clock_gettime)
libc_clock_gettime = (typeof(libc_clock_gettime))dlsym(RTLD_NEXT, __func__);
const int res = (*libc_clock_gettime)(clockid, tp);
if (res || clockid != CLOCK_REALTIME)
return res;
SET_FUDGE_WITH_SUBSECS(tp->tv_sec, tp->tv_nsec);
return 0;
}
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