Commit 6ec6a8e71e9850cfcade8a9c75bc894916da91cd - datefudge

Override clock_gettime(2) called with CLOCK_REALTIME argument. * datefudge.c: override clock_gettime(2) called with CLOCK_REALTIME argument to make it possible to fake `date' command (closes: #416175). * Update man page, add a simple example. Robert Luberda 16 years ago

4 changed file(s) with 71 addition(s) and 54 deletion(s). Raw diff Collapse all Expand all

+49

-42

datefudge.c less more

0		/*
	0	/* vim:ts=4:sts=4:sw=4:et:cindent
1	1	* datefudge.c: Twist system date back N seconds
2	2	*
3	3	* Copyright (C) 2001-2003, Matthias Urlichs <smurf@noris.de>
	4	*
	5	* $Id: datefudge.c 10 2008-05-10 06:19:48Z robert $
4	6	*/
5	7	#define _GNU_SOURCE
6	8

16	18	#include <time.h>
17	19	#include <sys/time.h>
18	20
19		#define _NAME(foo) #foo
20		#define NAME(foo) _NAME(foo)
21
22		#if 0
23		#define N_open "open"
24		#else
25		#if __GLIBC_MINOR__ >= 1
26		#define N_open NAME(__libc_open)
27		#else
28		#define N_open NAME(__open)
29		#endif
30		#endif
31
32	21	int fudge = 0;
33	22
34		static void
35		init_fudge (void)
36		{
37		const char *fud;
	23	static void init_fudge (void) {
	24	const char *fud;
38	25
39		if(fudge)return;
	26	if(fudge)return;
40	27
41		fud = getenv("DATEFUDGE");
42		if(fud == NULL) return;
43		fudge = atoi(fud);
	28	fud = getenv("DATEFUDGE");
	29	if(fud == NULL) return;
	30	fudge = atoi(fud);
44	31	}
45	32
46	33	/*

50	37	*/
51	38
52	39	time_t time(time_t *x) {
53		static time_t (libc_time)(time_t ) = NULL;
54		time_t res;
	40	static time_t (libc_time)(time_t ) = NULL;
	41	time_t res;
55	42
56		init_fudge();
57		if(!libc_time)
58		libc_time = (typeof(libc_time))dlsym (RTLD_NEXT, NAME(time));
59		res = (*libc_time)(x);
60		if(x) *x -= fudge;
61		res -= fudge;
62		return res;
	43	init_fudge();
	44	if(!libc_time)
	45	libc_time = (typeof(libc_time))dlsym (RTLD_NEXT, __func__);
	46	res = (*libc_time)(x);
	47	if(x) *x -= fudge;
	48	res -= fudge;
	49	return res;
63	50	}
64	51
65	52	int __gettimeofday(struct timeval x, struct timezone y) {
66		static time_t (libc_gettimeofday)(struct timeval , struct timezone *) = NULL;
67		int res;
	53	static int (libc_gettimeofday)(struct timeval , struct timezone *) = NULL;
	54	int res;
68	55
69		init_fudge();
70		if(!libc_gettimeofday)
71		libc_gettimeofday = (typeof(libc_gettimeofday))dlsym (RTLD_NEXT, NAME(__gettimeofday));
72		res = (*libc_gettimeofday)(x,y);
73		if(res) return res;
74		x->tv_sec -= fudge;
75		return 0;
	56	init_fudge();
	57	if(!libc_gettimeofday)
	58	libc_gettimeofday = (typeof(libc_gettimeofday))dlsym (RTLD_NEXT, __func__);
	59	res = (*libc_gettimeofday)(x,y);
	60	if(res) return res;
	61	x->tv_sec -= fudge;
	62	return 0;
76	63	}
77		int gettimeofday(struct timeval x, struct timezone y)
78		{ return __gettimeofday(x,y); }
79	64
	65	int gettimeofday(struct timeval x, struct timezone y) {
	66	return __gettimeofday(x,y);
	67	}
	68
	69
	70	int clock_gettime(clockid_t x, struct timespec *y) {
	71	static int (libc_clock_gettime)(clockid_t, struct timespec);
	72	int res;
	73
	74	init_fudge();
	75	if (!libc_clock_gettime)
	76	libc_clock_gettime = (typeof(libc_clock_gettime))dlsym (RTLD_NEXT, __func__);
	77	res = (*libc_clock_gettime)(x,y);
	78	if (res \|\| CLOCK_REALTIME != x) return res;
	79	y->tv_sec -= fudge;
	80	return 0;
	81	}
	82
	83
	84
	85
	86

+16

-10

datefudge.man less more

0		.TH DATEFUDGE "1" "March 2003" "datefudge @VERSION@" M.Urlichs
	0	.\" vim:ft=nroff
	1	.TH DATEFUDGE "1" "May 10th, 2008" "datefudge @VERSION@" Debian
1	2	.SH NAME
2	3	datefudge \- pretend the system time is different
3	4	.SH SYNOPSIS
4		.B datefudge
5		\fIat_date program [arguments...]\fR
	5	\fBdatefudge\fR \fIat_date program\fR [\fIarguments\fR ...]
6	6	.SH DESCRIPTION
7		.\" \fIdatefudge\fR pretends that the system time is different.
8	7	.PP
9		This is done by pre-loading a small library which modifies the
10		\fItime(2)\fR and \fIgettimeofday(2)\fR system calls.
	8	\fBdatefudge\fR is a small utility that pretends that the system time is different
	9	by pre-loading a small library which modifies the
	10	\fBtime\fR(2), \fBgettimeofday\fR(2) and \fBclock_gettime\fR(2) system calls.
11	11	.SH OPTIONS
12	12	\fB\-\-help\fR
13	13	print short usage information and exit.
14	14	.TP
15	15	\fB\-\-version\fR
16	16	print version information and exit.
	17	.SH EXAMPLE
	18	.nf
	19	\fI$ datefudge "2007\-04\-01 10:23" date \-R\fR
	20	Sun, 01 Apr 2007 10:23:00 +0200
	21	.fi
17	22	.SH AUTHOR
18		Written by Matthias Urlichs <smurf@noris.de>
	23	Written by Matthias Urlichs <smurf@noris.de>. Modified by
	24	Robert Luberda <robert@debian.org>.
19	25	.SH BUGS
20	26	There is no attempt to make this change undetectable by the program.
21	27	In particular, file modification times are \fBnot\fR modified.
22		.SH "REPORTING BUGS"
23		Send email to Matthias Urlichs <smurf@noris.de>.
	28	.\".SH "REPORTING BUGS"
	29	.\"Send email to Matthias Urlichs <smurf@noris.de>.
24	30	.SH COPYRIGHT
25	31	Copyright \(co 2003 by Matthias Urlichs.
26	32	.PP

30	36	.br
31	37	For more information about these matters, see the file named COPYING.
32	38	.SH "SEE ALSO"
33		ld.so(1), time(2), gettimeofday(2)
	39	\fBld.so\fR(1), \fBtime\fR(2), \fBgettimeofday\fR(2), \fBclock_gettime\fR(2)

-2

debian/changelog less more

0		datefudge (1.14) UNRELEASED; urgency=low
	0	datefudge (1.14) unstable; urgency=low
1	1
2	2	* New maintainer (closes: #429467).
3	3	* Standards-Version: 3.7.3 (no changes).
4	4	* Use debhelper v7 and its minimised rules file.
	5	* datefudge.c: override clock_gettime(2) called with CLOCK_REALTIME
	6	argument to make it possible to fake `date' command (closes: #416175).
	7	* Update man page, add a simple example.
5	8
6		-- Robert Luberda <robert@debian.org> Tue, 06 May 2008 22:20:52 +0200
	9	-- Robert Luberda <robert@debian.org> Sat, 10 May 2008 08:21:02 +0200
7	10
8	11	datefudge (1.13) unstable; urgency=low
9	12

-0

debian/docs less more

README