1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2010 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Common Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.opensource.org/licenses/cpl1.0.txt *
11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * Glenn Fowler <gsf@research.att.com> *
18 * David Korn <dgk@research.att.com> *
19 * Phong Vo <kpv@research.att.com> *
20 * *
21 ***********************************************************************/
22 #pragma prototyped
23 /*
24 * Glenn Fowler
25 * AT&T Research
26 *
27 * touch file access and modify times of file
28 * if flags&PATH_TOUCH_CREATE then file will be created if it doesn't exist
29 * if flags&PATH_TOUCH_VERBATIM then times are taken verbatim
30 * times have one second granularity
31 *
32 * (time_t)(-1) retain old time
33 * 0 use current time
34 *
35 * the old interface flag values were:
36 * 1 PATH_TOUCH_CREATE
37 * -1 PATH_TOUCH_CREATE|PATH_TOUCH_VERBATIM
38 * PATH_TOUCH_VERBATIM -- not supported
39 */
40
41 #include <ast.h>
42 #include <times.h>
43 #include <tv.h>
44
45 int
touch(const char * path,time_t at,time_t mt,int flags)46 touch(const char* path, time_t at, time_t mt, int flags)
47 {
48 Tv_t av;
49 Tv_t mv;
50 Tv_t* ap;
51 Tv_t* mp;
52
53 if (at == (time_t)(-1) && !(flags & PATH_TOUCH_VERBATIM))
54 ap = TV_TOUCH_RETAIN;
55 else if (!at && !(flags & PATH_TOUCH_VERBATIM))
56 ap = 0;
57 else
58 {
59 av.tv_sec = at;
60 av.tv_nsec = 0;
61 ap = &av;
62 }
63 if (mt == (time_t)(-1) && !(flags & PATH_TOUCH_VERBATIM))
64 mp = TV_TOUCH_RETAIN;
65 else if (!mt && !(flags & PATH_TOUCH_VERBATIM))
66 mp = 0;
67 else
68 {
69 mv.tv_sec = mt;
70 mv.tv_nsec = 0;
71 mp = &mv;
72 }
73 return tvtouch(path, ap, mp, NiL, flags & 1);
74 }
75