1 /* touch -- change modification and access times of files
2 Copyright (C) 87, 1989-1991, 1995-2000 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>
32 #include "safe-read.h"
34 /* The official name of this program (e.g., no `g' prefix). */
35 #define PROGRAM_NAME "touch"
38 "Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith"
44 /* Bitmasks for `change_times'. */
52 #if !defined O_NONBLOCK
53 # define O_NONBLOCK O_NDELAY
60 /* The name by which this program was run. */
63 /* Which timestamps to change. */
64 static int change_times;
66 /* (-c) If nonzero, don't create if not already there. */
69 /* (-d) If nonzero, date supplied on command line in get_date formats. */
70 static int flexible_date;
72 /* (-r) If nonzero, use times from a reference file. */
75 /* (-t) If nonzero, date supplied on command line in POSIX format. */
76 static int posix_date;
78 /* If nonzero, the only thing we have to do is change both the
79 modification and access time to the current time, so we don't
80 have to own the file, just be able to read and write it.
81 On some systems, we can do this if we own the file, even though
82 we have neither read nor write access to it. */
83 static int amtime_now;
85 /* New time to use when setting time. */
86 static time_t newtime;
88 /* File to use for -r. */
89 static char *ref_file;
91 /* Info about the reference file. */
92 static struct stat ref_stats;
94 /* For long options that have no equivalent short option, use a
95 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
98 TIME_OPTION = CHAR_MAX + 1
101 static struct option const longopts[] =
103 {"time", required_argument, 0, TIME_OPTION},
104 {"no-create", no_argument, 0, 'c'},
105 {"date", required_argument, 0, 'd'},
106 {"file", required_argument, 0, 'r'}, /* FIXME: phase out --file */
107 {"reference", required_argument, 0, 'r'},
108 {GETOPT_HELP_OPTION_DECL},
109 {GETOPT_VERSION_OPTION_DECL},
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. */
129 touch (const char *file)
138 /* Try to open FILE, creating it if necessary. */
139 fd = open (file, O_WRONLY | O_CREAT | O_NONBLOCK | O_NOCTTY,
140 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
147 /* We're setting only one of the time values. stat the target to get
148 the other one. If we have the file descriptor already, use fstat.
149 Otherwise, either we're in no-create mode (and hence didn't call open)
150 or FILE is inaccessible or a directory, so we have to use stat. */
151 if (fd != -1 ? fstat (fd, &sbuf) : stat (file, &sbuf))
154 error (0, open_errno, _("creating %s"), quote (file));
156 error (0, errno, _("getting attributes of %s"), quote (file));
162 if (fd != -1 && close (fd) < 0)
164 error (0, errno, _("creating %s"), quote (file));
170 /* Pass NULL to utime so it will not fail if we just have
171 write access to the file, but don't own it. */
172 status = utime (file, NULL);
178 /* There's currently no interface to set file timestamps with
179 better than 1-second resolution, so discard any fractional
180 part of the source timestamp. */
184 utb.actime = ref_stats.st_atime;
185 utb.modtime = ref_stats.st_mtime;
188 utb.actime = utb.modtime = newtime;
190 if (!(change_times & CH_ATIME))
191 utb.actime = sbuf.st_atime;
193 if (!(change_times & CH_MTIME))
194 utb.modtime = sbuf.st_mtime;
196 status = utime (file, &utb);
202 error (0, open_errno, _("creating %s"), quote (file));
204 error (0, errno, _("setting times of %s"), quote (file));
215 fprintf (stderr, _("Try `%s --help' for more information.\n"),
219 printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
220 printf (_(" or : %s [-acm] MMDDhhmm[YY] FILE... (obsolescent)\n"),
223 Update the access and modification times of each FILE to the current time.\n\
225 -a change only the access time\n\
226 -c, --no-create do not create any files\n\
227 -d, --date=STRING parse STRING and use it instead of current time\n\
229 -m change only the modification time\n\
230 -r, --reference=FILE use this file's times instead of current time\n\
231 -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time\n\
232 --time=WORD set time given by WORD: access atime use (same as -a)\n\
233 modify mtime (same as -m)\n\
234 --help display this help and exit\n\
235 --version output version information and exit\n\
237 Note that the three time-date formats recognized for the -d and -t options\n\
238 and for the obsolescent argument are all different.\n\
240 puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
246 main (int argc, char **argv)
252 program_name = argv[0];
253 setlocale (LC_ALL, "");
254 bindtextdomain (PACKAGE, LOCALEDIR);
255 textdomain (PACKAGE);
257 atexit (close_stdout);
259 change_times = no_create = use_ref = posix_date = flexible_date = 0;
260 newtime = (time_t) -1;
262 while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, NULL)) != -1)
270 change_times |= CH_ATIME;
279 newtime = get_date (optarg, NULL);
280 if (newtime == (time_t) -1)
281 error (1, 0, _("invalid date format %s"), quote (optarg));
289 change_times |= CH_MTIME;
299 newtime = posixtime (optarg,
300 PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS);
301 if (newtime == (time_t) -1)
302 error (1, 0, _("invalid date format %s"), quote (optarg));
306 case TIME_OPTION: /* --time */
307 change_times |= XARGMATCH ("--time", optarg,
308 time_args, time_masks);
311 case_GETOPT_HELP_CHAR;
313 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
320 if (change_times == 0)
321 change_times = CH_ATIME | CH_MTIME;
323 if ((use_ref && (posix_date || flexible_date))
324 || (posix_date && flexible_date))
326 error (0, 0, _("cannot specify times from more than one source"));
332 if (stat (ref_file, &ref_stats))
333 error (1, errno, _("getting attributes of %s"), quote (ref_file));
337 if (!date_set && optind < argc && !STREQ (argv[optind - 1], "--"))
339 newtime = posixtime (argv[optind], PDS_TRAILING_YEAR);
340 if (newtime != (time_t) -1)
348 if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME))
356 error (0, 0, _("file arguments missing"));
360 for (; optind < argc; ++optind)
361 err += touch (argv[optind]);