Mercurial > hg > octave-kai > gnulib-hg
annotate lib/utime.c @ 11583:dc80f2cc1327
Second attempt to work around an AIX 5.3, 6.1 compiler bug with include_next.
| author | Eric Blake <ebb9@byu.net> |
|---|---|
| date | Thu, 21 May 2009 16:48:12 +0200 |
| parents | bbbbbf4cd1c5 |
| children | e8d2c6fc33ad |
| 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 |
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Change copyright notice from GPLv2+ to GPLv3+.
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4 This program is free software: you can redistribute it and/or modify it |
| 1442 | 5 under the terms of the GNU General Public License as published by the |
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6 Free Software Foundation; either version 3 of the License, or any |
| 1442 | 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 | |
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 1442 | 16 |
| 17 /* derived from a function in touch.c */ | |
| 18 | |
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19 #include <config.h> |
| 1442 | 20 #undef utime |
| 21 | |
| 22 #include <sys/types.h> | |
| 23 | |
| 24 #ifdef HAVE_UTIME_H | |
| 25 # include <utime.h> | |
| 26 #endif | |
| 27 | |
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28 #if !HAVE_UTIMES_NULL |
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29 # include <sys/stat.h> |
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30 # include <fcntl.h> |
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31 #endif |
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32 |
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33 #include <unistd.h> |
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34 #include <errno.h> |
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35 |
| 3406 | 36 #include "full-write.h" |
| 1442 | 37 #include "safe-read.h" |
| 38 | |
| 39 /* Some systems (even some that do have <utime.h>) don't declare this | |
| 40 structure anywhere. */ | |
| 41 #ifndef HAVE_STRUCT_UTIMBUF | |
| 42 struct utimbuf | |
| 43 { | |
| 44 long actime; | |
| 45 long modtime; | |
| 46 }; | |
| 47 #endif | |
| 48 | |
| 7863 | 49 /* The results of open() in this file are not used with fchdir, |
| 50 therefore save some unnecessary work in fchdir.c. */ | |
| 51 #undef open | |
| 52 #undef close | |
| 53 | |
| 1442 | 54 /* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not |
| 55 interpret it to set the access and modification times of FILE to | |
| 56 the current time. Return 0 if successful, -1 if not. */ | |
| 57 | |
| 58 static int | |
| 59 utime_null (const char *file) | |
| 60 { | |
| 61 #if HAVE_UTIMES_NULL | |
| 62 return utimes (file, 0); | |
| 63 #else | |
| 64 int fd; | |
| 65 char c; | |
| 66 int status = 0; | |
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67 struct stat st; |
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68 int saved_errno = 0; |
| 1442 | 69 |
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70 fd = open (file, O_RDWR); |
| 1442 | 71 if (fd < 0 |
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72 || fstat (fd, &st) < 0 |
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73 || safe_read (fd, &c, sizeof c) == SAFE_READ_ERROR |
| 1442 | 74 || lseek (fd, (off_t) 0, SEEK_SET) < 0 |
| 3406 | 75 || full_write (fd, &c, sizeof c) != sizeof c |
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76 /* Maybe do this -- it's necessary on SunOS 4.1.3 with some combination |
| 1442 | 77 of patches, but that system doesn't use this code: it has utimes. |
| 78 || fsync (fd) < 0 | |
| 79 */ | |
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80 || (st.st_size == 0 && ftruncate (fd, st.st_size) < 0)) |
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81 { |
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82 saved_errno = errno; |
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83 status = -1; |
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84 } |
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85 |
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86 if (0 <= fd) |
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87 { |
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88 if (close (fd) < 0) |
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89 status = -1; |
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90 |
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91 /* If there was a prior failure, use the saved errno value. |
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92 But if the only failure was in the close, don't change errno. */ |
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93 if (saved_errno) |
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94 errno = saved_errno; |
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95 } |
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96 |
| 1442 | 97 return status; |
| 98 #endif | |
| 99 } | |
| 100 | |
| 101 int | |
| 102 rpl_utime (const char *file, const struct utimbuf *times) | |
| 103 { | |
| 104 if (times) | |
| 105 return utime (file, times); | |
| 106 | |
| 107 return utime_null (file); | |
| 108 } |