1 /* touch -- change modification and access times of files
2 Copyright (C) 87, 1989-1991, 1995-1999 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 Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie,
24 #include <sys/types.h>
31 #include "safe-read.h"
33 /* The official name of this program (e.g., no `g' prefix). */
34 #define PROGRAM_NAME "touch"
37 "Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith"
43 /* Bitmasks for `change_times'. */
47 /* The name by which this program was run. */
50 /* Which timestamps to change. */
51 static int change_times;
53 /* (-c) If nonzero, don't create if not already there. */
56 /* (-d) If nonzero, date supplied on command line in get_date formats. */
57 static int flexible_date;
59 /* (-r) If nonzero, use times from a reference file. */
62 /* (-t) If nonzero, date supplied on command line in POSIX format. */
63 static int posix_date;
65 /* If nonzero, the only thing we have to do is change both the
66 modification and access time to the current time, so we don't
67 have to own the file, just be able to read and write it.
68 On some systems, we can do this if we own the file, even though
69 we have neither read nor write access to it. */
70 static int amtime_now;
72 /* New time to use when setting time. */
73 static time_t newtime;
75 /* File to use for -r. */
76 static char *ref_file;
78 /* Info about the reference file. */
79 static struct stat ref_stats;
81 static struct option const longopts[] =
83 {"time", required_argument, 0, CHAR_MAX + 1},
84 {"no-create", no_argument, 0, 'c'},
85 {"date", required_argument, 0, 'd'},
86 {"file", required_argument, 0, 'r'}, /* FIXME: phase out --file */
87 {"reference", required_argument, 0, 'r'},
88 {GETOPT_HELP_OPTION_DECL},
89 {GETOPT_VERSION_OPTION_DECL},
93 /* Valid arguments to the `--time' option. */
94 static char const* const time_args[] =
96 "atime", "access", "use", "mtime", "modify", 0
99 /* The bits in `change_times' that those arguments set. */
100 static int const time_masks[] =
102 CH_ATIME, CH_ATIME, CH_ATIME, CH_MTIME, CH_MTIME
105 /* Update the time of file FILE according to the options given.
106 Return 0 if successful, 1 if an error occurs. */
109 touch (const char *file)
113 int fd IF_LINT (= 99);
123 /* Try to open FILE, creating it if necessary. */
124 fd = open (file, O_WRONLY | O_CREAT,
125 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
130 /* We're setting only one of the time values. stat the target to get
131 the other one. If we have the file descriptor already, use fstat.
132 Otherwise, either we're in no-create mode (and hence didn't call open)
133 or FILE is inaccessible or a directory, so we have to use stat. */
134 if ((valid_fd && fd != -1) ? fstat (fd, &sbuf) : stat (file, &sbuf))
136 error (0, errno, "%s", file);
142 if (valid_fd && fd != -1 && close (fd) < 0)
144 error (0, errno, "%s", file);
150 /* Pass NULL to utime so it will not fail if we just have
151 write access to the file, but don't own it. */
152 status = utime (file, NULL);
158 /* There's currently no interface to set file timestamps with
159 better than 1-second resolution, so discard any fractional
160 part of the source timestamp. */
164 utb.actime = ref_stats.st_atime;
165 utb.modtime = ref_stats.st_mtime;
168 utb.actime = utb.modtime = newtime;
170 if (!(change_times & CH_ATIME))
171 utb.actime = sbuf.st_atime;
173 if (!(change_times & CH_MTIME))
174 utb.modtime = sbuf.st_mtime;
176 status = utime (file, &utb);
181 error (0, errno, "%s", file);
192 fprintf (stderr, _("Try `%s --help' for more information.\n"),
196 printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
197 printf (_(" or : %s [-acm] MMDDhhmm[YY] FILE... (obsolescent)\n"),
200 Update the access and modification times of each FILE to the current time.\n\
202 -a change only the access time\n\
203 -c, --no-create do not create any files\n\
204 -d, --date=STRING parse STRING and use it instead of current time\n\
206 -m change only the modification time\n\
207 -r, --reference=FILE use this file's times instead of current time\n\
208 -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time\n\
209 --time=WORD set time given by WORD: access atime use (same as -a)\n\
210 modify mtime (same as -m)\n\
211 --help display this help and exit\n\
212 --version output version information and exit\n\
214 Note that the three time-date formats recognized for the -d and -t options\n\
215 and for the obsolescent argument are all different.\n\
217 puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
224 main (int argc, char **argv)
230 program_name = argv[0];
231 setlocale (LC_ALL, "");
232 bindtextdomain (PACKAGE, LOCALEDIR);
233 textdomain (PACKAGE);
235 change_times = no_create = use_ref = posix_date = flexible_date = 0;
236 newtime = (time_t) -1;
238 while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, NULL)) != -1)
246 change_times |= CH_ATIME;
255 newtime = get_date (optarg, NULL);
256 if (newtime == (time_t) -1)
257 error (1, 0, _("invalid date format `%s'"), optarg);
265 change_times |= CH_MTIME;
275 newtime = posixtime (optarg,
276 PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS);
277 if (newtime == (time_t) -1)
278 error (1, 0, _("invalid date format `%s'"), optarg);
282 case CHAR_MAX + 1: /* --time */
283 change_times |= XARGMATCH ("--time", optarg,
284 time_args, time_masks);
287 case_GETOPT_HELP_CHAR;
289 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
296 if (change_times == 0)
297 change_times = CH_ATIME | CH_MTIME;
299 if ((use_ref && (posix_date || flexible_date))
300 || (posix_date && flexible_date))
302 error (0, 0, _("cannot specify times from more than one source"));
308 if (stat (ref_file, &ref_stats))
309 error (1, errno, "%s", ref_file);
313 if (!date_set && optind < argc && !STREQ (argv[optind - 1], "--"))
315 newtime = posixtime (argv[optind], PDS_TRAILING_YEAR);
316 if (newtime != (time_t) -1)
324 if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME))
332 error (0, 0, _("file arguments missing"));
336 for (; optind < argc; ++optind)
337 err += touch (argv[optind]);