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author | Holger Weiss <holger@zedat.fu-berlin.de> | 2013-08-19 23:27:12 +0200 |
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committer | Holger Weiss <holger@zedat.fu-berlin.de> | 2013-08-19 23:27:12 +0200 |
commit | 26fbe7f1e68bb0c96da32491efcf3696fe6c299b (patch) | |
tree | c4d95289187a64e9c7517bf73d8208026c3d2fb3 /gl/open.c | |
parent | 5f79e3e9f62ca5487d9881973149136ba1d19d3e (diff) | |
download | monitoring-plugins-26fbe7f1e68bb0c96da32491efcf3696fe6c299b.tar.gz |
Sync with the latest Gnulib code (6f2d632)
Diffstat (limited to 'gl/open.c')
-rw-r--r-- | gl/open.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/gl/open.c b/gl/open.c deleted file mode 100644 index f612b802..00000000 --- a/gl/open.c +++ /dev/null | |||
@@ -1,166 +0,0 @@ | |||
1 | /* Open a descriptor to a file. | ||
2 | Copyright (C) 2007-2010 Free Software Foundation, Inc. | ||
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 Bruno Haible <bruno@clisp.org>, 2007. */ | ||
18 | |||
19 | #include <config.h> | ||
20 | |||
21 | /* Get the original definition of open. It might be defined as a macro. */ | ||
22 | #define __need_system_fcntl_h | ||
23 | #include <fcntl.h> | ||
24 | #undef __need_system_fcntl_h | ||
25 | #include <sys/types.h> | ||
26 | |||
27 | static inline int | ||
28 | orig_open (const char *filename, int flags, mode_t mode) | ||
29 | { | ||
30 | return open (filename, flags, mode); | ||
31 | } | ||
32 | |||
33 | /* Specification. */ | ||
34 | #include <fcntl.h> | ||
35 | |||
36 | #include <errno.h> | ||
37 | #include <stdarg.h> | ||
38 | #include <string.h> | ||
39 | #include <sys/types.h> | ||
40 | #include <sys/stat.h> | ||
41 | #include <unistd.h> | ||
42 | |||
43 | #ifndef REPLACE_OPEN_DIRECTORY | ||
44 | # define REPLACE_OPEN_DIRECTORY 0 | ||
45 | #endif | ||
46 | |||
47 | int | ||
48 | open (const char *filename, int flags, ...) | ||
49 | { | ||
50 | mode_t mode; | ||
51 | int fd; | ||
52 | |||
53 | mode = 0; | ||
54 | if (flags & O_CREAT) | ||
55 | { | ||
56 | va_list arg; | ||
57 | va_start (arg, flags); | ||
58 | |||
59 | /* We have to use PROMOTED_MODE_T instead of mode_t, otherwise GCC 4 | ||
60 | creates crashing code when 'mode_t' is smaller than 'int'. */ | ||
61 | mode = va_arg (arg, PROMOTED_MODE_T); | ||
62 | |||
63 | va_end (arg); | ||
64 | } | ||
65 | |||
66 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | ||
67 | if (strcmp (filename, "/dev/null") == 0) | ||
68 | filename = "NUL"; | ||
69 | #endif | ||
70 | |||
71 | #if OPEN_TRAILING_SLASH_BUG | ||
72 | /* If the filename ends in a slash and one of O_CREAT, O_WRONLY, O_RDWR | ||
73 | is specified, then fail. | ||
74 | Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html> | ||
75 | says that | ||
76 | "A pathname that contains at least one non-slash character and that | ||
77 | ends with one or more trailing slashes shall be resolved as if a | ||
78 | single dot character ( '.' ) were appended to the pathname." | ||
79 | and | ||
80 | "The special filename dot shall refer to the directory specified by | ||
81 | its predecessor." | ||
82 | If the named file already exists as a directory, then | ||
83 | - if O_CREAT is specified, open() must fail because of the semantics | ||
84 | of O_CREAT, | ||
85 | - if O_WRONLY or O_RDWR is specified, open() must fail because POSIX | ||
86 | <http://www.opengroup.org/susv3/functions/open.html> says that it | ||
87 | fails with errno = EISDIR in this case. | ||
88 | If the named file does not exist or does not name a directory, then | ||
89 | - if O_CREAT is specified, open() must fail since open() cannot create | ||
90 | directories, | ||
91 | - if O_WRONLY or O_RDWR is specified, open() must fail because the | ||
92 | file does not contain a '.' directory. */ | ||
93 | if (flags & (O_CREAT | O_WRONLY | O_RDWR)) | ||
94 | { | ||
95 | size_t len = strlen (filename); | ||
96 | if (len > 0 && filename[len - 1] == '/') | ||
97 | { | ||
98 | errno = EISDIR; | ||
99 | return -1; | ||
100 | } | ||
101 | } | ||
102 | #endif | ||
103 | |||
104 | fd = orig_open (filename, flags, mode); | ||
105 | |||
106 | #if REPLACE_FCHDIR | ||
107 | /* Implementing fchdir and fdopendir requires the ability to open a | ||
108 | directory file descriptor. If open doesn't support that (as on | ||
109 | mingw), we use a dummy file that behaves the same as directories | ||
110 | on Linux (ie. always reports EOF on attempts to read()), and | ||
111 | override fstat() in fchdir.c to hide the fact that we have a | ||
112 | dummy. */ | ||
113 | if (REPLACE_OPEN_DIRECTORY && fd < 0 && errno == EACCES | ||
114 | && (flags & O_ACCMODE) == O_RDONLY) | ||
115 | { | ||
116 | struct stat statbuf; | ||
117 | if (stat (filename, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | ||
118 | { | ||
119 | /* Maximum recursion depth of 1. */ | ||
120 | fd = open ("/dev/null", flags, mode); | ||
121 | if (0 <= fd) | ||
122 | fd = _gl_register_fd (fd, filename); | ||
123 | } | ||
124 | else | ||
125 | errno = EACCES; | ||
126 | } | ||
127 | #endif | ||
128 | |||
129 | #if OPEN_TRAILING_SLASH_BUG | ||
130 | /* If the filename ends in a slash and fd does not refer to a directory, | ||
131 | then fail. | ||
132 | Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html> | ||
133 | says that | ||
134 | "A pathname that contains at least one non-slash character and that | ||
135 | ends with one or more trailing slashes shall be resolved as if a | ||
136 | single dot character ( '.' ) were appended to the pathname." | ||
137 | and | ||
138 | "The special filename dot shall refer to the directory specified by | ||
139 | its predecessor." | ||
140 | If the named file without the slash is not a directory, open() must fail | ||
141 | with ENOTDIR. */ | ||
142 | if (fd >= 0) | ||
143 | { | ||
144 | /* We know len is positive, since open did not fail with ENOENT. */ | ||
145 | size_t len = strlen (filename); | ||
146 | if (filename[len - 1] == '/') | ||
147 | { | ||
148 | struct stat statbuf; | ||
149 | |||
150 | if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode)) | ||
151 | { | ||
152 | close (fd); | ||
153 | errno = ENOTDIR; | ||
154 | return -1; | ||
155 | } | ||
156 | } | ||
157 | } | ||
158 | #endif | ||
159 | |||
160 | #if REPLACE_FCHDIR | ||
161 | if (!REPLACE_OPEN_DIRECTORY && 0 <= fd) | ||
162 | fd = _gl_register_fd (fd, filename); | ||
163 | #endif | ||
164 | |||
165 | return fd; | ||
166 | } | ||