Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/utime.c @ 9268:a553c18c572d
Rename sys_time_.h to sys_time.in.h.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Tue, 02 Oct 2007 00:37:40 +0200 |
| parents | cb2590895141 |
| children | bbbbbf4cd1c5 |
| rev | line source |
|---|---|
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* _fpending.c: Include <config.h> unconditionally, since we no
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1 /* Copyright (C) 1998, 2001, 2002, 2003, 2004, 2006 Free Software |
|
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2 Foundation, Inc. |
| 1442 | 3 |
| 4 This program is free software; you can redistribute it and/or modify it | |
| 5 under the terms of the GNU General Public License as published by the | |
| 6 Free Software Foundation; either version 2, or (at your option) any | |
| 7 later version. | |
| 8 | |
| 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. | |
| 13 | |
| 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, | |
|
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 1442 | 17 |
| 18 /* derived from a function in touch.c */ | |
| 19 | |
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20 #include <config.h> |
| 1442 | 21 #undef utime |
| 22 | |
| 23 #include <sys/types.h> | |
| 24 | |
| 25 #ifdef HAVE_UTIME_H | |
| 26 # include <utime.h> | |
| 27 #endif | |
| 28 | |
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29 #if !HAVE_UTIMES_NULL |
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30 # include <sys/stat.h> |
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31 # include <fcntl.h> |
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32 #endif |
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33 |
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34 #include <unistd.h> |
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35 #include <errno.h> |
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36 |
| 3406 | 37 #include "full-write.h" |
| 1442 | 38 #include "safe-read.h" |
| 39 | |
| 40 /* Some systems (even some that do have <utime.h>) don't declare this | |
| 41 structure anywhere. */ | |
| 42 #ifndef HAVE_STRUCT_UTIMBUF | |
| 43 struct utimbuf | |
| 44 { | |
| 45 long actime; | |
| 46 long modtime; | |
| 47 }; | |
| 48 #endif | |
| 49 | |
| 7863 | 50 /* The results of open() in this file are not used with fchdir, |
| 51 therefore save some unnecessary work in fchdir.c. */ | |
| 52 #undef open | |
| 53 #undef close | |
| 54 | |
| 1442 | 55 /* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not |
| 56 interpret it to set the access and modification times of FILE to | |
| 57 the current time. Return 0 if successful, -1 if not. */ | |
| 58 | |
| 59 static int | |
| 60 utime_null (const char *file) | |
| 61 { | |
| 62 #if HAVE_UTIMES_NULL | |
| 63 return utimes (file, 0); | |
| 64 #else | |
| 65 int fd; | |
| 66 char c; | |
| 67 int status = 0; | |
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68 struct stat st; |
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69 int saved_errno = 0; |
| 1442 | 70 |
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71 fd = open (file, O_RDWR); |
| 1442 | 72 if (fd < 0 |
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73 || fstat (fd, &st) < 0 |
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74 || safe_read (fd, &c, sizeof c) == SAFE_READ_ERROR |
| 1442 | 75 || lseek (fd, (off_t) 0, SEEK_SET) < 0 |
| 3406 | 76 || full_write (fd, &c, sizeof c) != sizeof c |
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77 /* Maybe do this -- it's necessary on SunOS 4.1.3 with some combination |
| 1442 | 78 of patches, but that system doesn't use this code: it has utimes. |
| 79 || fsync (fd) < 0 | |
| 80 */ | |
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81 || (st.st_size == 0 && ftruncate (fd, st.st_size) < 0)) |
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82 { |
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83 saved_errno = errno; |
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84 status = -1; |
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85 } |
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86 |
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87 if (0 <= fd) |
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88 { |
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89 if (close (fd) < 0) |
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90 status = -1; |
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91 |
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92 /* If there was a prior failure, use the saved errno value. |
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93 But if the only failure was in the close, don't change errno. */ |
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94 if (saved_errno) |
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95 errno = saved_errno; |
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96 } |
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97 |
| 1442 | 98 return status; |
| 99 #endif | |
| 100 } | |
| 101 | |
| 102 int | |
| 103 rpl_utime (const char *file, const struct utimbuf *times) | |
| 104 { | |
| 105 if (times) | |
| 106 return utime (file, times); | |
| 107 | |
| 108 return utime_null (file); | |
| 109 } |