1 /* touch -- change modification and access times of files
2 Copyright (C) 87, 1989-1991, 1995-2002 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>
33 #include "safe-read.h"
35 /* The official name of this program (e.g., no `g' prefix). */
36 #define PROGRAM_NAME "touch"
39 "Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith"
45 /* Bitmasks for `change_times'. */
53 #if !defined O_NONBLOCK
54 # define O_NONBLOCK O_NDELAY
65 /* The name by which this program was run. */
68 /* Which timestamps to change. */
69 static int change_times;
71 /* (-c) If nonzero, don't create if not already there. */
74 /* (-d) If nonzero, date supplied on command line in get_date formats. */
75 static int flexible_date;
77 /* (-r) If nonzero, use times from a reference file. */
80 /* (-t) If nonzero, date supplied on command line in POSIX format. */
81 static int posix_date;
83 /* If nonzero, the only thing we have to do is change both the
84 modification and access time to the current time, so we don't
85 have to own the file, just be able to read and write it.
86 On some systems, we can do this if we own the file, even though
87 we have neither read nor write access to it. */
88 static int amtime_now;
90 /* New time to use when setting time. */
91 static time_t newtime;
93 /* File to use for -r. */
94 static char *ref_file;
96 /* Info about the reference file. */
97 static struct stat ref_stats;
99 /* For long options that have no equivalent short option, use a
100 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
103 TIME_OPTION = CHAR_MAX + 1
106 static struct option const longopts[] =
108 {"time", required_argument, 0, TIME_OPTION},
109 {"no-create", no_argument, 0, 'c'},
110 {"date", required_argument, 0, 'd'},
111 {"file", required_argument, 0, 'r'}, /* FIXME: phase out --file */
112 {"reference", required_argument, 0, 'r'},
113 {GETOPT_HELP_OPTION_DECL},
114 {GETOPT_VERSION_OPTION_DECL},
118 /* Valid arguments to the `--time' option. */
119 static char const* const time_args[] =
121 "atime", "access", "use", "mtime", "modify", 0
124 /* The bits in `change_times' that those arguments set. */
125 static int const time_masks[] =
127 CH_ATIME, CH_ATIME, CH_ATIME, CH_MTIME, CH_MTIME
130 /* Update the time of file FILE according to the options given.
131 Return 0 if successful, 1 if an error occurs. */
134 touch (const char *file)
143 /* Try to open FILE, creating it if necessary. */
144 fd = open (file, O_WRONLY | O_CREAT | O_NONBLOCK | O_NOCTTY,
145 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
147 /* Don't save a copy of errno if it's EISDIR, since that would lead
148 touch to give a bogus diagnostic for e.g., `touch /' (assuming
149 we don't own / or have write access to it). On Solaris 5.6,
150 and probably other systems, it is EINVAL. On SunOS4, it's EPERM. */
151 if (fd == -1 && errno != EISDIR && errno != EINVAL && errno != EPERM)
157 /* We're setting only one of the time values. stat the target to get
158 the other one. If we have the file descriptor already, use fstat.
159 Otherwise, either we're in no-create mode (and hence didn't call open)
160 or FILE is inaccessible or a directory, so we have to use stat. */
161 if (fd != -1 ? fstat (fd, &sbuf) : stat (file, &sbuf))
164 error (0, open_errno, _("creating %s"), quote (file));
167 if (no_create && errno == ENOENT)
169 error (0, errno, _("failed to get attributes of %s"),
177 if (fd != -1 && close (fd) < 0)
179 error (0, errno, _("creating %s"), quote (file));
185 /* Pass NULL to utime so it will not fail if we just have
186 write access to the file, but don't own it. */
187 status = utime (file, NULL);
193 /* There's currently no interface to set file timestamps with
194 better than 1-second resolution, so discard any fractional
195 part of the source timestamp. */
199 utb.actime = ref_stats.st_atime;
200 utb.modtime = ref_stats.st_mtime;
203 utb.actime = utb.modtime = newtime;
205 if (!(change_times & CH_ATIME))
206 utb.actime = sbuf.st_atime;
208 if (!(change_times & CH_MTIME))
209 utb.modtime = sbuf.st_mtime;
211 status = utime (file, &utb);
217 error (0, open_errno, _("creating %s"), quote (file));
220 if (no_create && errno == ENOENT)
222 error (0, errno, _("setting times of %s"), quote (file));
234 fprintf (stderr, _("Try `%s --help' for more information.\n"),
238 printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
240 Update the access and modification times of each FILE to the current time.\n\
244 Mandatory arguments to long options are mandatory for short options too.\n\
247 -a change only the access time\n\
248 -c, --no-create do not create any files\n\
249 -d, --date=STRING parse STRING and use it instead of current time\n\
251 -m change only the modification time\n\
254 -r, --reference=FILE use this file's times instead of current time\n\
255 -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time\n\
256 --time=WORD set time given by WORD: access atime use (same as -a)\n\
257 modify mtime (same as -m)\n\
259 fputs (HELP_OPTION_DESCRIPTION, stdout);
260 fputs (VERSION_OPTION_DESCRIPTION, stdout);
263 Note that the -d and -t options accept different time-date formats.\n\
265 printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
271 main (int argc, char **argv)
277 program_name = argv[0];
278 setlocale (LC_ALL, "");
279 bindtextdomain (PACKAGE, LOCALEDIR);
280 textdomain (PACKAGE);
282 atexit (close_stdout);
284 change_times = no_create = use_ref = posix_date = flexible_date = 0;
286 while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, NULL)) != -1)
294 change_times |= CH_ATIME;
303 newtime = get_date (optarg, NULL);
304 if (newtime == (time_t) -1)
305 error (EXIT_FAILURE, 0, _("invalid date format %s"), quote (optarg));
313 change_times |= CH_MTIME;
323 if (! posixtime (&newtime, optarg,
324 PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS))
325 error (EXIT_FAILURE, 0, _("invalid date format %s"), quote (optarg));
329 case TIME_OPTION: /* --time */
330 change_times |= XARGMATCH ("--time", optarg,
331 time_args, time_masks);
334 case_GETOPT_HELP_CHAR;
336 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
343 if (change_times == 0)
344 change_times = CH_ATIME | CH_MTIME;
346 if ((use_ref && (posix_date || flexible_date))
347 || (posix_date && flexible_date))
349 error (0, 0, _("cannot specify times from more than one source"));
355 if (stat (ref_file, &ref_stats))
356 error (EXIT_FAILURE, errno,
357 _("failed to get attributes of %s"), quote (ref_file));
361 /* The obsolete `MMDDhhmm[YY]' form is valid IFF there are
362 two or more non-option arguments. */
363 if (!date_set && 2 <= argc - optind && !STREQ (argv[optind - 1], "--")
364 && posix2_version () < 200112)
366 if (posixtime (&newtime, argv[optind], PDS_TRAILING_YEAR))
368 if (! getenv ("POSIXLY_CORRECT"))
370 struct tm const *tm = localtime (&newtime);
372 _("warning: `touch %s' is obsolete; use `touch -t %04d%02d%02d%02d%02d.%02d'"),
374 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
375 tm->tm_hour, tm->tm_min, tm->tm_sec);
384 if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME))
392 error (0, 0, _("file arguments missing"));
396 for (; optind < argc; ++optind)
397 err += touch (argv[optind]);