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'},
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);
173 error (0, errno, "%s", file);
177 if (file_created && amtime_now)
181 error (0, errno, "%s", file);
184 return 0; /* We've done all we have to. */
187 if (fstat (fd, &sbuf))
189 error (0, errno, "%s", file);
196 error (0, errno, "%s", file);
202 /* Pass NULL to utime so it will not fail if we just have
203 write access to the file, but don't own it. */
204 status = utime (file, NULL);
210 /* There's currently no interface to set file timestamps with
211 better than 1-second resolution, so discard any fractional
212 part of the source timestamp. */
216 utb.actime = ref_stats.st_atime;
217 utb.modtime = ref_stats.st_mtime;
220 utb.actime = utb.modtime = newtime;
222 if (!(change_times & CH_ATIME))
223 utb.actime = sbuf.st_atime;
225 if (!(change_times & CH_MTIME))
226 utb.modtime = sbuf.st_mtime;
228 status = utime (file, &utb);
233 error (0, errno, "%s", file);
244 fprintf (stderr, _("Try `%s --help' for more information.\n"),
248 printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
249 printf (_(" or : %s [-acm] MMDDhhmm[YY] FILE... (obsolescent)\n"),
252 Update the access and modification times of each FILE to the current time.\n\
254 -a change only the access time\n\
255 -c do not create any files\n\
256 -d, --date=STRING parse STRING and use it instead of current time\n\
258 -m change only the modification time\n\
259 -r, --reference=FILE use this file's times instead of current time\n\
260 -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time\n\
261 --time=WORD access -a, atime -a, mtime -m, modify -m, use -a\n\
262 --help display this help and exit\n\
263 --version output version information and exit\n\
265 STAMP may be used without -t if none of -drt, nor --, are used.\n\
266 Note that the three time-date formats recognized for the -d and -t options\n\
267 and for the obsolescent argument are all different.\n\
269 puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
276 main (int argc, char **argv)
282 program_name = argv[0];
283 setlocale (LC_ALL, "");
284 bindtextdomain (PACKAGE, LOCALEDIR);
285 textdomain (PACKAGE);
287 change_times = no_create = use_ref = posix_date = flexible_date = 0;
288 newtime = (time_t) -1;
290 while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, NULL)) != -1)
298 change_times |= CH_ATIME;
307 newtime = get_date (optarg, NULL);
308 if (newtime == (time_t) -1)
309 error (1, 0, _("invalid date format `%s'"), optarg);
317 change_times |= CH_MTIME;
327 newtime = posixtime (optarg,
328 PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS);
329 if (newtime == (time_t) -1)
330 error (1, 0, _("invalid date format `%s'"), optarg);
334 case CHAR_MAX + 1: /* --time */
335 change_times |= XARGMATCH ("--time", optarg,
336 time_args, time_masks);
339 case_GETOPT_HELP_CHAR;
341 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
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 && !STREQ (argv[optind - 1], "--"))
367 newtime = posixtime (argv[optind], PDS_TRAILING_YEAR);
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]);