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>
56 #ifndef HAVE_UTIME_NULL
57 static int utime_now ();
60 /* Bitmasks for `change_times'. */
64 /* The name by which this program was run. */
67 /* Which timestamps to change. */
68 static int change_times;
70 /* (-c) If nonzero, don't create if not already there. */
73 /* (-d) If nonzero, date supplied on command line in get_date formats. */
74 static int flexible_date;
76 /* (-r) If nonzero, use times from a reference file. */
79 /* (-t) If nonzero, date supplied on command line in POSIX format. */
80 static int posix_date;
82 /* If nonzero, the only thing we have to do is change both the
83 modification and access time to the current time, so we don't
84 have to own the file, just be able to read and write it. */
85 static int amtime_now;
87 /* New time to use when setting time. */
88 static time_t newtime;
90 /* File to use for -r. */
91 static char *ref_file;
93 /* Info about the reference file. */
94 static struct stat ref_stats;
96 /* If nonzero, display usage information and exit. */
99 /* If nonzero, print the version on standard output and exit. */
100 static int show_version;
102 static struct option const longopts[] =
104 {"time", required_argument, 0, 130},
105 {"no-create", no_argument, 0, 'c'},
106 {"date", required_argument, 0, 'd'},
107 {"file", required_argument, 0, 'r'},
108 {"reference", required_argument, 0, 'r'},
109 {"help", no_argument, &show_help, 1},
110 {"version", no_argument, &show_version, 1},
114 /* Valid arguments to the `--time' option. */
115 static char const* const time_args[] =
117 "atime", "access", "use", "mtime", "modify", 0
120 /* The bits in `change_times' that those arguments set. */
121 static int const time_masks[] =
123 CH_ATIME, CH_ATIME, CH_ATIME, CH_MTIME, CH_MTIME
126 /* Update the time of file FILE according to the options given.
127 Return 0 if successful, 1 if an error occurs. */
136 if (stat (file, &sbuf))
140 error (0, errno, "%s", file);
145 fd = creat (file, 0666);
148 error (0, errno, "%s", file);
155 error (0, errno, "%s", file);
158 return 0; /* We've done all we have to. */
160 if (fstat (fd, &sbuf))
162 error (0, errno, "%s", file);
168 error (0, errno, "%s", file);
175 #ifndef HAVE_UTIME_NULL
176 status = utime_now (file, sbuf.st_size);
178 /* Pass NULL to utime so it will not fail if we just have
179 write access to the file, but don't own it. */
180 status = utime (file, NULL);
189 utb.actime = ref_stats.st_atime;
190 utb.modtime = ref_stats.st_mtime;
193 utb.actime = utb.modtime = newtime;
195 if (!(change_times & CH_ATIME))
196 utb.actime = sbuf.st_atime;
198 if (!(change_times & CH_MTIME))
199 utb.modtime = sbuf.st_mtime;
201 status = utime (file, &utb);
206 error (0, errno, "%s", file);
213 #ifndef HAVE_UTIME_NULL
214 /* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not
215 interpret it to set the access and modification times of FILE to
216 the current time. FILESIZE is the correct size of FILE, used to
217 make sure empty files are not lengthened to 1 byte.
218 Return 0 if successful, -1 if not. */
221 utime_now (file, filesize)
229 fd = open (file, O_RDWR, 0666);
231 || safe_read (fd, &c, sizeof (char)) < 0
232 || lseek (fd, (off_t) 0, SEEK_SET) < 0
233 || full_write (fd, &c, sizeof (char)) < 0
234 || ftruncate (fd, filesize) < 0
245 fprintf (stderr, _("Try `%s --help' for more information.\n"),
249 printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
251 Update the access and modification times of each FILE to the current time.\n\
253 -a change only the access time\n\
254 -c do not create any files\n\
255 -d, --date=STRING parse STRING and use it instead of current time\n\
257 -m change only the modification time\n\
258 -r, --reference=FILE use this file's times instead of current time\n\
259 -t STAMP use MMDDhhmm[[CC]YY][.ss] instead of current time\n\
260 --help display this help and exit\n\
261 --time=WORD access -a, atime -a, mtime -m, modify -m, use -a\n\
262 --version output version information and exit\n\
264 STAMP may be used without -t if none of -drt, nor --, are used.\n"));
270 main (int argc, char **argv)
276 program_name = argv[0];
277 change_times = no_create = use_ref = posix_date = flexible_date = 0;
278 newtime = (time_t) -1;
280 while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, (int *) 0))
289 change_times |= CH_ATIME;
298 newtime = get_date (optarg, NULL);
299 if (newtime == (time_t) -1)
300 error (1, 0, _("invalid date format `%s'"), optarg);
308 change_times |= CH_MTIME;
318 newtime = posixtime (optarg);
319 if (newtime == (time_t) -1)
320 error (1, 0, _("invalid date format `%s'"), optarg);
325 i = argmatch (optarg, time_args);
328 invalid_arg (_("time selector"), optarg, i);
331 change_times |= time_masks[i];
341 printf ("touch - %s\n", version_string);
348 if (change_times == 0)
349 change_times = CH_ATIME | CH_MTIME;
351 if ((use_ref && (posix_date || flexible_date))
352 || (posix_date && flexible_date))
354 error (0, 0, _("cannot specify times from more than one source"));
360 if (stat (ref_file, &ref_stats))
361 error (1, errno, "%s", ref_file);
365 if (!date_set && optind < argc && strcmp (argv[optind - 1], "--"))
367 newtime = posixtime (argv[optind]);
368 if (newtime != (time_t) -1)
376 if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME))
384 error (0, 0, _("file arguments missing"));
388 for (; optind < argc; ++optind)
389 err += touch (argv[optind]);