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"
45 /* Bitmasks for `change_times'. */
49 /* The name by which this program was run. */
52 /* Which timestamps to change. */
53 static int change_times;
55 /* (-c) If nonzero, don't create if not already there. */
58 /* (-d) If nonzero, date supplied on command line in get_date formats. */
59 static int flexible_date;
61 /* (-r) If nonzero, use times from a reference file. */
64 /* (-t) If nonzero, date supplied on command line in POSIX format. */
65 static int posix_date;
67 /* If nonzero, the only thing we have to do is change both the
68 modification and access time to the current time, so we don't
69 have to own the file, just be able to read and write 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 /* Open FILE, possibly creating it. Set *FILE_CREATED to nonzero if the
106 open creates it, or to zero if the open call opened an existing file.
107 Return the result of the open call. Be careful to avoid race conditions. */
110 open_maybe_create (const char *file, int *file_created)
117 /* First, see if we can create a new FILE. */
118 fd = open (file, O_WRONLY | O_CREAT | O_EXCL,
119 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
123 /* If the open succeeded or if it failed for any reason other
124 than the existence of FILE, then we're done. */
125 if (fd != -1 || errno != EEXIST)
128 /* The first open failed because FILE already exists.
129 Now try to open it for writing. */
130 fd = open (file, O_WRONLY);
132 /* If the open succeeded or if it failed for any reason other
133 than the absence of FILE, then we're done. */
134 /* The 2nd open can fail if FILE was unlinked between the two
135 open calls. When that happens, just iterate. */
136 if (fd != -1 || errno != ENOENT)
143 /* Update the time of file FILE according to the options given.
144 Return 0 if successful, 1 if an error occurs. */
147 touch (const char *file)
156 /* Try to open an existing FILE. */
157 fd = open (file, O_WRONLY);
158 if (fd == -1 && errno == ENOENT)
160 /* FILE doesn't exist. So we're done. */
167 /* Try to open FILE, creating it if necessary. */
168 fd = open_maybe_create (file, &file_created);
171 /* Don't fail if the open failed because FILE is a directory. */
173 /* As usual, using E* macros like this is risky...
177 error (0, errno, "%s", file);
187 error (0, errno, "%s", file);
191 /* We've just created the file with the current times. */
197 /* We're setting only one of the time values. stat the target to get
198 the other one. If we have the file descriptor already, use fstat,
199 otherwise, FILE is a directory, so we have to use stat. */
200 if (fd == -1 ? stat (file, &sbuf) : fstat (fd, &sbuf))
202 error (0, errno, "%s", file);
208 if (fd != -1 && close (fd) < 0)
210 error (0, errno, "%s", file);
216 /* Pass NULL to utime so it will not fail if we just have
217 write access to the file, but don't own it. */
218 status = utime (file, NULL);
224 /* There's currently no interface to set file timestamps with
225 better than 1-second resolution, so discard any fractional
226 part of the source timestamp. */
230 utb.actime = ref_stats.st_atime;
231 utb.modtime = ref_stats.st_mtime;
234 utb.actime = utb.modtime = newtime;
236 if (!(change_times & CH_ATIME))
237 utb.actime = sbuf.st_atime;
239 if (!(change_times & CH_MTIME))
240 utb.modtime = sbuf.st_mtime;
242 status = utime (file, &utb);
247 error (0, errno, "%s", file);
258 fprintf (stderr, _("Try `%s --help' for more information.\n"),
262 printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
263 printf (_(" or : %s [-acm] MMDDhhmm[YY] FILE... (obsolescent)\n"),
266 Update the access and modification times of each FILE to the current time.\n\
268 -a change only the access time\n\
269 -c, --no-create do not create any files\n\
270 -d, --date=STRING parse STRING and use it instead of current time\n\
272 -m change only the modification time\n\
273 -r, --reference=FILE use this file's times instead of current time\n\
274 -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time\n\
275 --time=WORD access -a, atime -a, mtime -m, modify -m, use -a\n\
276 --help display this help and exit\n\
277 --version output version information and exit\n\
279 STAMP may be used without -t if none of -drt, nor --, are used.\n\
280 Note that the three time-date formats recognized for the -d and -t options\n\
281 and for the obsolescent argument are all different.\n\
283 puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
290 main (int argc, char **argv)
296 program_name = argv[0];
297 setlocale (LC_ALL, "");
298 bindtextdomain (PACKAGE, LOCALEDIR);
299 textdomain (PACKAGE);
301 change_times = no_create = use_ref = posix_date = flexible_date = 0;
302 newtime = (time_t) -1;
304 while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, NULL)) != -1)
312 change_times |= CH_ATIME;
321 newtime = get_date (optarg, NULL);
322 if (newtime == (time_t) -1)
323 error (1, 0, _("invalid date format `%s'"), optarg);
331 change_times |= CH_MTIME;
341 newtime = posixtime (optarg,
342 PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS);
343 if (newtime == (time_t) -1)
344 error (1, 0, _("invalid date format `%s'"), optarg);
348 case CHAR_MAX + 1: /* --time */
349 change_times |= XARGMATCH ("--time", optarg,
350 time_args, time_masks);
353 case_GETOPT_HELP_CHAR;
355 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
362 if (change_times == 0)
363 change_times = CH_ATIME | CH_MTIME;
365 if ((use_ref && (posix_date || flexible_date))
366 || (posix_date && flexible_date))
368 error (0, 0, _("cannot specify times from more than one source"));
374 if (stat (ref_file, &ref_stats))
375 error (1, errno, "%s", ref_file);
379 if (!date_set && optind < argc && !STREQ (argv[optind - 1], "--"))
381 newtime = posixtime (argv[optind], PDS_TRAILING_YEAR);
382 if (newtime != (time_t) -1)
390 if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME))
398 error (0, 0, _("file arguments missing"));
402 for (; optind < argc; ++optind)
403 err += touch (argv[optind]);