Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/utime.c @ 5159:a535859efd14
Merge from coreutils.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Sat, 07 Aug 2004 00:09:38 +0000 |
| parents | 8b1923c943a6 |
| children | a48fb0e98c8c |
| rev | line source |
|---|---|
| 5159 | 1 /* Copyright (C) 1998, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
| 1442 | 2 |
| 3 This program is free software; you can redistribute it and/or modify it | |
| 4 under the terms of the GNU General Public License as published by the | |
| 5 Free Software Foundation; either version 2, or (at your option) any | |
| 6 later version. | |
| 7 | |
| 8 This program is distributed in the hope that it will be useful, | |
| 9 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 11 GNU General Public License for more details. | |
| 12 | |
| 13 You should have received a copy of the GNU General Public License | |
| 14 along with this program; if not, write to the Free Software Foundation, | |
| 15 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
| 16 | |
| 17 /* derived from a function in touch.c */ | |
| 18 | |
| 19 #ifdef HAVE_CONFIG_H | |
| 20 # include <config.h> | |
| 21 #endif | |
| 22 #undef utime | |
| 23 | |
| 24 #include <sys/types.h> | |
| 25 | |
| 26 #ifdef HAVE_UTIME_H | |
| 27 # include <utime.h> | |
| 28 #endif | |
| 29 | |
|
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30 #if !HAVE_UTIMES_NULL |
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31 # include <sys/stat.h> |
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32 # include <fcntl.h> |
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33 #endif |
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34 |
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35 #include <unistd.h> |
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36 #include <errno.h> |
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37 |
| 3406 | 38 #include "full-write.h" |
| 1442 | 39 #include "safe-read.h" |
| 40 | |
| 41 /* Some systems (even some that do have <utime.h>) don't declare this | |
| 42 structure anywhere. */ | |
| 43 #ifndef HAVE_STRUCT_UTIMBUF | |
| 44 struct utimbuf | |
| 45 { | |
| 46 long actime; | |
| 47 long modtime; | |
| 48 }; | |
| 49 #endif | |
| 50 | |
| 51 /* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not | |
| 52 interpret it to set the access and modification times of FILE to | |
| 53 the current time. Return 0 if successful, -1 if not. */ | |
| 54 | |
| 55 static int | |
| 56 utime_null (const char *file) | |
| 57 { | |
| 58 #if HAVE_UTIMES_NULL | |
| 59 return utimes (file, 0); | |
| 60 #else | |
| 61 int fd; | |
| 62 char c; | |
| 63 int status = 0; | |
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64 struct stat st; |
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65 int saved_errno = 0; |
| 1442 | 66 |
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67 fd = open (file, O_RDWR); |
| 1442 | 68 if (fd < 0 |
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69 || fstat (fd, &st) < 0 |
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70 || safe_read (fd, &c, sizeof c) == SAFE_READ_ERROR |
| 1442 | 71 || lseek (fd, (off_t) 0, SEEK_SET) < 0 |
| 3406 | 72 || full_write (fd, &c, sizeof c) != sizeof c |
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73 /* Maybe do this -- it's necessary on SunOS 4.1.3 with some combination |
| 1442 | 74 of patches, but that system doesn't use this code: it has utimes. |
| 75 || fsync (fd) < 0 | |
| 76 */ | |
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77 || (st.st_size == 0 && ftruncate (fd, st.st_size) < 0)) |
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78 { |
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79 saved_errno = errno; |
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80 status = -1; |
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81 } |
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82 |
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83 if (0 <= fd) |
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84 { |
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85 if (close (fd) < 0) |
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86 status = -1; |
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87 |
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88 /* If there was a prior failure, use the saved errno value. |
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89 But if the only failure was in the close, don't change errno. */ |
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90 if (saved_errno) |
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91 errno = saved_errno; |
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92 } |
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93 |
| 1442 | 94 return status; |
| 95 #endif | |
| 96 } | |
| 97 | |
| 98 int | |
| 99 rpl_utime (const char *file, const struct utimbuf *times) | |
| 100 { | |
| 101 if (times) | |
| 102 return utime (file, times); | |
| 103 | |
| 104 return utime_null (file); | |
| 105 } |