Mercurial > hg > octave-kai > gnulib-hg
annotate lib/utimensat.c @ 17463:203c036eb0c6
bootstrap: support checksum utils without a --status option
* build-aux/bootstrap: Only look for sha1sum if updating po files.
Add sha1 to the list of supported checksum utils since it's now
supported through adjustments below.
(update_po_files): Remove the use of --status
in a way that will suppress all error messages, but since this is
only used to minimize updates, it shouldn't cause an issue.
Exit early if there is a problem updating the po file checksums.
(find_tool): Remove the check for --version support as this
is optional as per commit 86186b17. Don't even check for the
presence of the command as if that is needed, it's supported
through configuring prerequisites in bootstrap.conf.
Prompt that when a tool isn't found, one can define an environment
variable to add to the hardcoded search list.
| author | Pádraig Brady <P@draigBrady.com> |
|---|---|
| date | Thu, 08 Aug 2013 11:08:49 +0100 |
| parents | 5f320210ead1 |
| children |
| rev | line source |
|---|---|
| 12174 | 1 /* Set the access and modification time of a file relative to directory fd. |
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2 Copyright (C) 2009-2013 Free Software Foundation, Inc. |
| 12174 | 3 |
| 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 3 of the License, or | |
| 7 (at your option) any 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, see <http://www.gnu.org/licenses/>. */ | |
| 16 | |
| 17 /* written by Eric Blake */ | |
| 18 | |
| 19 #include <config.h> | |
| 20 | |
| 21 #include <sys/stat.h> | |
| 22 | |
| 23 #include <errno.h> | |
| 24 #include <fcntl.h> | |
| 25 | |
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26 #include "stat-time.h" |
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27 #include "timespec.h" |
| 12174 | 28 #include "utimens.h" |
| 29 | |
| 30 #if HAVE_UTIMENSAT | |
| 31 | |
| 32 # undef utimensat | |
| 33 | |
| 34 /* If we have a native utimensat, but are compiling this file, then | |
| 35 utimensat was defined to rpl_utimensat by our replacement | |
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36 sys/stat.h. We assume the native version might fail with ENOSYS, |
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37 or succeed without properly affecting ctime (as is the case when |
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38 using newer glibc but older Linux kernel). In this scenario, |
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39 rpl_utimensat checks whether the native version is usable, and |
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40 local_utimensat provides the fallback manipulation. */ |
| 12174 | 41 |
| 42 static int local_utimensat (int, char const *, struct timespec const[2], int); | |
| 43 # define AT_FUNC_NAME local_utimensat | |
| 44 | |
| 45 /* Like utimensat, but work around native bugs. */ | |
| 46 | |
| 47 int | |
| 48 rpl_utimensat (int fd, char const *file, struct timespec const times[2], | |
| 49 int flag) | |
| 50 { | |
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51 # if defined __linux__ || defined __sun |
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52 struct timespec ts[2]; |
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53 # endif |
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54 |
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55 /* See comments in utimens.c for details. */ |
| 12174 | 56 static int utimensat_works_really; /* 0 = unknown, 1 = yes, -1 = no. */ |
| 57 if (0 <= utimensat_works_really) | |
| 58 { | |
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59 int result; |
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60 # if defined __linux__ || defined __sun |
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61 struct stat st; |
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62 /* As recently as Linux kernel 2.6.32 (Dec 2009), several file |
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63 systems (xfs, ntfs-3g) have bugs with a single UTIME_OMIT, |
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64 but work if both times are either explicitly specified or |
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65 UTIME_NOW. Work around it with a preparatory [l]stat prior |
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66 to calling utimensat; fortunately, there is not much timing |
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67 impact due to the extra syscall even on file systems where |
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68 UTIME_OMIT would have worked. |
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69 |
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70 The same bug occurs in Solaris 11.1 (Apr 2013). |
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71 |
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72 FIXME: Simplify this for Linux in 2016 and for Solaris in |
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73 2024, when file system bugs are no longer common. */ |
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74 if (times && (times[0].tv_nsec == UTIME_OMIT |
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75 || times[1].tv_nsec == UTIME_OMIT)) |
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76 { |
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77 if (fstatat (fd, file, &st, flag)) |
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78 return -1; |
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79 if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) |
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80 return 0; |
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81 if (times[0].tv_nsec == UTIME_OMIT) |
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82 ts[0] = get_stat_atime (&st); |
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83 else |
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84 ts[0] = times[0]; |
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85 if (times[1].tv_nsec == UTIME_OMIT) |
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86 ts[1] = get_stat_mtime (&st); |
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87 else |
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88 ts[1] = times[1]; |
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89 times = ts; |
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90 } |
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91 # ifdef __hppa__ |
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92 /* Linux kernel 2.6.22.19 on hppa does not reject invalid tv_nsec |
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93 values. */ |
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94 else if (times |
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95 && ((times[0].tv_nsec != UTIME_NOW |
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96 && (times[0].tv_nsec < 0 |
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97 || times[0].tv_nsec >= 1000000000)) |
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98 || (times[1].tv_nsec != UTIME_NOW |
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99 && (times[1].tv_nsec < 0 |
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100 || times[1].tv_nsec >= 1000000000)))) |
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101 { |
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102 errno = EINVAL; |
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103 return -1; |
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104 } |
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105 # endif |
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106 # endif |
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107 result = utimensat (fd, file, times, flag); |
| 12174 | 108 /* Linux kernel 2.6.25 has a bug where it returns EINVAL for |
| 109 UTIME_NOW or UTIME_OMIT with non-zero tv_sec, which | |
| 110 local_utimensat works around. Meanwhile, EINVAL for a bad | |
| 111 flag is indeterminate whether the native utimensat works, but | |
| 112 local_utimensat will also reject it. */ | |
| 113 if (result == -1 && errno == EINVAL && (flag & ~AT_SYMLINK_NOFOLLOW)) | |
| 114 return result; | |
| 115 if (result == 0 || (errno != ENOSYS && errno != EINVAL)) | |
| 116 { | |
| 117 utimensat_works_really = 1; | |
| 118 return result; | |
| 119 } | |
| 120 } | |
| 121 /* No point in trying openat/futimens, since on Linux, futimens is | |
| 122 implemented with the same syscall as utimensat. Only avoid the | |
| 123 native utimensat due to an ENOSYS failure; an EINVAL error was | |
| 124 data-dependent, and the next caller may pass valid data. */ | |
| 125 if (0 <= utimensat_works_really && errno == ENOSYS) | |
| 126 utimensat_works_really = -1; | |
| 127 return local_utimensat (fd, file, times, flag); | |
| 128 } | |
| 129 | |
| 130 #else /* !HAVE_UTIMENSAT */ | |
| 131 | |
| 132 # define AT_FUNC_NAME utimensat | |
| 133 | |
| 134 #endif /* !HAVE_UTIMENSAT */ | |
| 135 | |
| 136 /* Set the access and modification time stamps of FILE to be | |
| 137 TIMESPEC[0] and TIMESPEC[1], respectively; relative to directory | |
| 138 FD. If flag is AT_SYMLINK_NOFOLLOW, change the times of a symlink, | |
| 139 or fail with ENOSYS if not possible. If TIMESPEC is null, set the | |
| 140 time stamps to the current time. If possible, do it without | |
| 141 changing the working directory. Otherwise, resort to using | |
| 142 save_cwd/fchdir, then utimens/restore_cwd. If either the save_cwd | |
| 143 or the restore_cwd fails, then give a diagnostic and exit nonzero. | |
| 144 Return 0 on success, -1 (setting errno) on failure. */ | |
| 145 | |
| 146 /* AT_FUNC_NAME is now utimensat or local_utimensat. */ | |
| 147 #define AT_FUNC_F1 lutimens | |
| 148 #define AT_FUNC_F2 utimens | |
| 149 #define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW | |
| 150 #define AT_FUNC_POST_FILE_PARAM_DECLS , struct timespec const ts[2], int flag | |
| 151 #define AT_FUNC_POST_FILE_ARGS , ts | |
| 152 #include "at-func.c" | |
| 153 #undef AT_FUNC_NAME | |
| 154 #undef AT_FUNC_F1 | |
| 155 #undef AT_FUNC_F2 | |
| 156 #undef AT_FUNC_USE_F1_COND | |
| 157 #undef AT_FUNC_POST_FILE_PARAM_DECLS | |
| 158 #undef AT_FUNC_POST_FILE_ARGS |