/* touch -- change modification and access times of files Copyright (C) 87, 1989-1991, 1995-1999 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith. */ #include #include #include #include #include "system.h" #include "argmatch.h" #include "error.h" #include "getdate.h" #include "posixtm.h" #include "safe-read.h" /* The official name of this program (e.g., no `g' prefix). */ #define PROGRAM_NAME "touch" #define AUTHORS \ "Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith" #ifndef STDC_HEADERS time_t time (); #endif /* Bitmasks for `change_times'. */ #define CH_ATIME 1 #define CH_MTIME 2 /* The name by which this program was run. */ char *program_name; /* Which timestamps to change. */ static int change_times; /* (-c) If nonzero, don't create if not already there. */ static int no_create; /* (-d) If nonzero, date supplied on command line in get_date formats. */ static int flexible_date; /* (-r) If nonzero, use times from a reference file. */ static int use_ref; /* (-t) If nonzero, date supplied on command line in POSIX format. */ static int posix_date; /* If nonzero, the only thing we have to do is change both the modification and access time to the current time, so we don't have to own the file, just be able to read and write it. On some systems, we can do this if we own the file, even though we have neither read nor write access to it. */ static int amtime_now; /* New time to use when setting time. */ static time_t newtime; /* File to use for -r. */ static char *ref_file; /* Info about the reference file. */ static struct stat ref_stats; static struct option const longopts[] = { {"time", required_argument, 0, CHAR_MAX + 1}, {"no-create", no_argument, 0, 'c'}, {"date", required_argument, 0, 'd'}, {"file", required_argument, 0, 'r'}, /* FIXME: phase out --file */ {"reference", required_argument, 0, 'r'}, {GETOPT_HELP_OPTION_DECL}, {GETOPT_VERSION_OPTION_DECL}, {0, 0, 0, 0} }; /* Valid arguments to the `--time' option. */ static char const* const time_args[] = { "atime", "access", "use", "mtime", "modify", 0 }; /* The bits in `change_times' that those arguments set. */ static int const time_masks[] = { CH_ATIME, CH_ATIME, CH_ATIME, CH_MTIME, CH_MTIME }; /* Update the time of file FILE according to the options given. Return 0 if successful, 1 if an error occurs. */ static int touch (const char *file) { int status; struct stat sbuf; int fd = -1; int open_errno = 0; if (! no_create) { /* Try to open FILE, creating it if necessary. */ fd = open (file, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); if (fd == -1) open_errno = errno; } if (! amtime_now) { /* We're setting only one of the time values. stat the target to get the other one. If we have the file descriptor already, use fstat. Otherwise, either we're in no-create mode (and hence didn't call open) or FILE is inaccessible or a directory, so we have to use stat. */ if (fd != -1 ? fstat (fd, &sbuf) : stat (file, &sbuf)) { error (0, open_errno ? open_errno : errno, "%s", file); close (fd); return 1; } } if (fd != -1 && close (fd) < 0) { error (0, errno, "%s", file); return 1; } if (amtime_now) { /* Pass NULL to utime so it will not fail if we just have write access to the file, but don't own it. */ status = utime (file, NULL); } else { struct utimbuf utb; /* There's currently no interface to set file timestamps with better than 1-second resolution, so discard any fractional part of the source timestamp. */ if (use_ref) { utb.actime = ref_stats.st_atime; utb.modtime = ref_stats.st_mtime; } else utb.actime = utb.modtime = newtime; if (!(change_times & CH_ATIME)) utb.actime = sbuf.st_atime; if (!(change_times & CH_MTIME)) utb.modtime = sbuf.st_mtime; status = utime (file, &utb); } if (status) { error (0, open_errno ? open_errno : errno, "%s", file); return 1; } return 0; } void usage (int status) { if (status != 0) fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name); else { printf (_("Usage: %s [OPTION]... FILE...\n"), program_name); printf (_(" or : %s [-acm] MMDDhhmm[YY] FILE... (obsolescent)\n"), program_name); printf (_("\ Update the access and modification times of each FILE to the current time.\n\ \n\ -a change only the access time\n\ -c, --no-create do not create any files\n\ -d, --date=STRING parse STRING and use it instead of current time\n\ -f (ignored)\n\ -m change only the modification time\n\ -r, --reference=FILE use this file's times instead of current time\n\ -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time\n\ --time=WORD set time given by WORD: access atime use (same as -a)\n\ modify mtime (same as -m)\n\ --help display this help and exit\n\ --version output version information and exit\n\ \n\ Note that the three time-date formats recognized for the -d and -t options\n\ and for the obsolescent argument are all different.\n\ ")); puts (_("\nReport bugs to .")); close_stdout (); } exit (status); } int main (int argc, char **argv) { int c; int date_set = 0; int err = 0; program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); change_times = no_create = use_ref = posix_date = flexible_date = 0; newtime = (time_t) -1; while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, NULL)) != -1) { switch (c) { case 0: break; case 'a': change_times |= CH_ATIME; break; case 'c': no_create++; break; case 'd': flexible_date++; newtime = get_date (optarg, NULL); if (newtime == (time_t) -1) error (1, 0, _("invalid date format `%s'"), optarg); date_set++; break; case 'f': break; case 'm': change_times |= CH_MTIME; break; case 'r': use_ref++; ref_file = optarg; break; case 't': posix_date++; newtime = posixtime (optarg, PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS); if (newtime == (time_t) -1) error (1, 0, _("invalid date format `%s'"), optarg); date_set++; break; case CHAR_MAX + 1: /* --time */ change_times |= XARGMATCH ("--time", optarg, time_args, time_masks); break; case_GETOPT_HELP_CHAR; case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); default: usage (1); } } if (change_times == 0) change_times = CH_ATIME | CH_MTIME; if ((use_ref && (posix_date || flexible_date)) || (posix_date && flexible_date)) { error (0, 0, _("cannot specify times from more than one source")); usage (1); } if (use_ref) { if (stat (ref_file, &ref_stats)) error (1, errno, "%s", ref_file); date_set++; } if (!date_set && optind < argc && !STREQ (argv[optind - 1], "--")) { newtime = posixtime (argv[optind], PDS_TRAILING_YEAR); if (newtime != (time_t) -1) { optind++; date_set++; } } if (!date_set) { if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME)) amtime_now = 1; else time (&newtime); } if (optind == argc) { error (0, 0, _("file arguments missing")); usage (1); } for (; optind < argc; ++optind) err += touch (argv[optind]); exit (err != 0); }