1 /* touch -- change modification and access times of files
2 Copyright (C) 1987, 1989, 1990, 1991, 1995 Free Software Foundation Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 -a, --time={atime,access,use} Change access time only.
20 -c, --no-create Do not create files that do not exist.
21 -d, --date=TIME Specify time and date in various formats.
23 -m, --time={mtime,modify} Change modification time only.
24 -r, --reference=FILE Use the time and date of reference file FILE.
25 -t TIME Specify time and date in the form
26 `MMDDhhmm[[CC]YY][.ss]'.
28 If no options are given, -am is the default, using the current time.
29 The -r, -t, and -d options are mutually exclusive. If a file does not
30 exist, create it unless -c is given.
32 Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie,
38 #include <sys/types.h>
55 #ifndef HAVE_UTIME_NULL
56 static int utime_now ();
59 /* Bitmasks for `change_times'. */
63 /* The name by which this program was run. */
66 /* Which timestamps to change. */
67 static int change_times;
69 /* (-c) If nonzero, don't create if not already there. */
72 /* (-d) If nonzero, date supplied on command line in get_date formats. */
73 static int flexible_date;
75 /* (-r) If nonzero, use times from a reference file. */
78 /* (-t) If nonzero, date supplied on command line in POSIX format. */
79 static int posix_date;
81 /* If nonzero, the only thing we have to do is change both the
82 modification and access time to the current time, so we don't
83 have to own the file, just be able to read and write it. */
84 static int amtime_now;
86 /* New time to use when setting time. */
87 static time_t newtime;
89 /* File to use for -r. */
90 static char *ref_file;
92 /* Info about the reference file. */
93 static struct stat ref_stats;
95 /* If nonzero, display usage information and exit. */
98 /* If nonzero, print the version on standard output and exit. */
99 static int show_version;
101 static struct option const longopts[] =
103 {"time", required_argument, 0, 130},
104 {"no-create", no_argument, 0, 'c'},
105 {"date", required_argument, 0, 'd'},
106 {"file", required_argument, 0, 'r'},
107 {"reference", required_argument, 0, 'r'},
108 {"help", no_argument, &show_help, 1},
109 {"version", no_argument, &show_version, 1},
113 /* Valid arguments to the `--time' option. */
114 static char const* const time_args[] =
116 "atime", "access", "use", "mtime", "modify", 0
119 /* The bits in `change_times' that those arguments set. */
120 static int const time_masks[] =
122 CH_ATIME, CH_ATIME, CH_ATIME, CH_MTIME, CH_MTIME
125 /* Update the time of file FILE according to the options given.
126 Return 0 if successful, 1 if an error occurs. */
135 if (stat (file, &sbuf))
139 error (0, errno, "%s", file);
144 fd = creat (file, 0666);
147 error (0, errno, "%s", file);
154 error (0, errno, "%s", file);
157 return 0; /* We've done all we have to. */
159 if (fstat (fd, &sbuf))
161 error (0, errno, "%s", file);
167 error (0, errno, "%s", file);
174 #ifndef HAVE_UTIME_NULL
175 status = utime_now (file, sbuf.st_size);
177 /* Pass NULL to utime so it will not fail if we just have
178 write access to the file, but don't own it. */
179 status = utime (file, NULL);
188 utb.actime = ref_stats.st_atime;
189 utb.modtime = ref_stats.st_mtime;
192 utb.actime = utb.modtime = newtime;
194 if (!(change_times & CH_ATIME))
195 utb.actime = sbuf.st_atime;
197 if (!(change_times & CH_MTIME))
198 utb.modtime = sbuf.st_mtime;
200 status = utime (file, &utb);
205 error (0, errno, "%s", file);
212 #ifndef HAVE_UTIME_NULL
213 /* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not
214 interpret it to set the access and modification times of FILE to
215 the current time. FILESIZE is the correct size of FILE, used to
216 make sure empty files are not lengthened to 1 byte.
217 Return 0 if successful, -1 if not. */
220 utime_now (file, filesize)
228 fd = open (file, O_RDWR, 0666);
230 || safe_read (fd, &c, sizeof (char)) < 0
231 || lseek (fd, (off_t) 0, SEEK_SET) < 0
232 || full_write (fd, &c, sizeof (char)) < 0
233 || ftruncate (fd, filesize) < 0
244 fprintf (stderr, _("Try `%s --help' for more information.\n"),
248 printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
250 Update the access and modification times of each FILE to the current time.\n\
252 -a change only the access time\n\
253 -c do not create any files\n\
254 -d, --date=STRING parse STRING and use it instead of current time\n\
256 -m change only the modification time\n\
257 -r, --reference=FILE use this file's times instead of current time\n\
258 -t STAMP use MMDDhhmm[[CC]YY][.ss] instead of current time\n\
259 --time=WORD access -a, atime -a, mtime -m, modify -m, use -a\n\
260 --help display this help and exit\n\
261 --version output version information and exit\n\
263 STAMP may be used without -t if none of -drt, nor --, are used.\n"));
269 main (int argc, char **argv)
275 program_name = argv[0];
276 setlocale (LC_ALL, "");
277 bindtextdomain (PACKAGE, LOCALEDIR);
278 textdomain (PACKAGE);
280 change_times = no_create = use_ref = posix_date = flexible_date = 0;
281 newtime = (time_t) -1;
283 while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, (int *) 0))
292 change_times |= CH_ATIME;
301 newtime = get_date (optarg, NULL);
302 if (newtime == (time_t) -1)
303 error (1, 0, _("invalid date format `%s'"), optarg);
311 change_times |= CH_MTIME;
321 newtime = posixtime (optarg);
322 if (newtime == (time_t) -1)
323 error (1, 0, _("invalid date format `%s'"), optarg);
328 i = argmatch (optarg, time_args);
331 invalid_arg (_("time selector"), optarg, i);
334 change_times |= time_masks[i];
344 printf ("touch - %s\n", PACKAGE_VERSION);
351 if (change_times == 0)
352 change_times = CH_ATIME | CH_MTIME;
354 if ((use_ref && (posix_date || flexible_date))
355 || (posix_date && flexible_date))
357 error (0, 0, _("cannot specify times from more than one source"));
363 if (stat (ref_file, &ref_stats))
364 error (1, errno, "%s", ref_file);
368 if (!date_set && optind < argc && strcmp (argv[optind - 1], "--"))
370 newtime = posixtime (argv[optind]);
371 if (newtime != (time_t) -1)
379 if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME))
387 error (0, 0, _("file arguments missing"));
391 for (; optind < argc; ++optind)
392 err += touch (argv[optind]);