1 | /* Copyright (C) 1991-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library 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 GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <stddef.h> |
20 | #include <unistd.h> |
21 | #include <limits.h> |
22 | #include <fcntl.h> |
23 | #include <sys/stat.h> |
24 | #include <sys/statfs.h> |
25 | #include <sys/statvfs.h> |
26 | |
27 | |
28 | /* Get file-specific information about PATH. */ |
29 | long int |
30 | __pathconf (const char *path, int name) |
31 | { |
32 | if (path[0] == '\0') |
33 | { |
34 | __set_errno (ENOENT); |
35 | return -1; |
36 | } |
37 | |
38 | switch (name) |
39 | { |
40 | default: |
41 | __set_errno (EINVAL); |
42 | return -1; |
43 | |
44 | case _PC_LINK_MAX: |
45 | #ifdef LINK_MAX |
46 | return LINK_MAX; |
47 | #else |
48 | return -1; |
49 | #endif |
50 | |
51 | case _PC_MAX_CANON: |
52 | #ifdef MAX_CANON |
53 | return MAX_CANON; |
54 | #else |
55 | return -1; |
56 | #endif |
57 | |
58 | case _PC_MAX_INPUT: |
59 | #ifdef MAX_INPUT |
60 | return MAX_INPUT; |
61 | #else |
62 | return -1; |
63 | #endif |
64 | |
65 | case _PC_NAME_MAX: |
66 | #ifdef NAME_MAX |
67 | { |
68 | struct statvfs64 sv; |
69 | int save_errno = errno; |
70 | |
71 | if (__statvfs64 (path, &sv) < 0) |
72 | { |
73 | if (errno == ENOSYS) |
74 | { |
75 | errno = save_errno; |
76 | return NAME_MAX; |
77 | } |
78 | return -1; |
79 | } |
80 | else |
81 | { |
82 | return sv.f_namemax; |
83 | } |
84 | } |
85 | #else |
86 | return -1; |
87 | #endif |
88 | |
89 | case _PC_PATH_MAX: |
90 | #ifdef PATH_MAX |
91 | return PATH_MAX; |
92 | #else |
93 | return -1; |
94 | #endif |
95 | |
96 | case _PC_PIPE_BUF: |
97 | #ifdef PIPE_BUF |
98 | return PIPE_BUF; |
99 | #else |
100 | return -1; |
101 | #endif |
102 | |
103 | case _PC_CHOWN_RESTRICTED: |
104 | #ifdef _POSIX_CHOWN_RESTRICTED |
105 | return _POSIX_CHOWN_RESTRICTED; |
106 | #else |
107 | return -1; |
108 | #endif |
109 | |
110 | case _PC_NO_TRUNC: |
111 | #ifdef _POSIX_NO_TRUNC |
112 | return _POSIX_NO_TRUNC; |
113 | #else |
114 | return -1; |
115 | #endif |
116 | |
117 | case _PC_VDISABLE: |
118 | #ifdef _POSIX_VDISABLE |
119 | return _POSIX_VDISABLE; |
120 | #else |
121 | return -1; |
122 | #endif |
123 | |
124 | case _PC_SYNC_IO: |
125 | #ifdef _POSIX_SYNC_IO |
126 | return _POSIX_SYNC_IO; |
127 | #else |
128 | return -1; |
129 | #endif |
130 | |
131 | case _PC_ASYNC_IO: |
132 | #ifdef _POSIX_ASYNC_IO |
133 | { |
134 | /* AIO is only allowed on regular files and block devices. */ |
135 | struct stat64 st; |
136 | |
137 | if (__xstat64 (_STAT_VER, path, &st) < 0 |
138 | || (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode))) |
139 | return -1; |
140 | else |
141 | return 1; |
142 | } |
143 | #else |
144 | return -1; |
145 | #endif |
146 | |
147 | case _PC_PRIO_IO: |
148 | #ifdef _POSIX_PRIO_IO |
149 | return _POSIX_PRIO_IO; |
150 | #else |
151 | return -1; |
152 | #endif |
153 | |
154 | case _PC_SOCK_MAXBUF: |
155 | #ifdef SOCK_MAXBUF |
156 | return SOCK_MAXBUF; |
157 | #else |
158 | return -1; |
159 | #endif |
160 | |
161 | case _PC_FILESIZEBITS: |
162 | #ifdef FILESIZEBITS |
163 | return FILESIZEBITS; |
164 | #else |
165 | /* We let platforms with larger file sizes overwrite this value. */ |
166 | return 32; |
167 | #endif |
168 | |
169 | case _PC_REC_INCR_XFER_SIZE: |
170 | /* XXX It is not entirely clear what the limit is supposed to do. |
171 | What is incremented? */ |
172 | return -1; |
173 | |
174 | case _PC_REC_MAX_XFER_SIZE: |
175 | /* XXX It is not entirely clear what the limit is supposed to do. |
176 | In general there is no top limit of the number of bytes which |
177 | case be transported at once. */ |
178 | return -1; |
179 | |
180 | case _PC_REC_MIN_XFER_SIZE: |
181 | { |
182 | /* XXX It is not entirely clear what the limit is supposed to do. |
183 | I assume this is the block size of the filesystem. */ |
184 | struct statvfs64 sv; |
185 | |
186 | if (__statvfs64 (path, &sv) < 0) |
187 | return -1; |
188 | return sv.f_bsize; |
189 | } |
190 | |
191 | case _PC_REC_XFER_ALIGN: |
192 | { |
193 | /* XXX It is not entirely clear what the limit is supposed to do. |
194 | I assume that the number should reflect the minimal block |
195 | alignment. */ |
196 | struct statvfs64 sv; |
197 | |
198 | if (__statvfs64 (path, &sv) < 0) |
199 | return -1; |
200 | return sv.f_frsize; |
201 | } |
202 | |
203 | case _PC_ALLOC_SIZE_MIN: |
204 | { |
205 | /* XXX It is not entirely clear what the limit is supposed to do. |
206 | I assume that the number should reflect the minimal block |
207 | alignment. */ |
208 | struct statvfs64 sv; |
209 | |
210 | if (__statvfs64 (path, &sv) < 0) |
211 | return -1; |
212 | return sv.f_frsize; |
213 | } |
214 | |
215 | case _PC_SYMLINK_MAX: |
216 | /* In general there are no limits. If a system has one it should |
217 | overwrite this case. */ |
218 | return -1; |
219 | |
220 | case _PC_2_SYMLINKS: |
221 | /* Unix systems generally have symlinks. */ |
222 | return 1; |
223 | } |
224 | } |
225 | |
226 | #undef __pathconf |
227 | weak_alias (__pathconf, pathconf) |
228 | |