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 <sys/stat.h> |
23 | #include <sys/statfs.h> |
24 | #include <sys/statvfs.h> |
25 | |
26 | |
27 | /* Get file-specific information about descriptor FD. */ |
28 | long int |
29 | __fpathconf (int fd, int name) |
30 | { |
31 | if (fd < 0) |
32 | { |
33 | __set_errno (EBADF); |
34 | return -1; |
35 | } |
36 | |
37 | switch (name) |
38 | { |
39 | default: |
40 | __set_errno (EINVAL); |
41 | return -1; |
42 | |
43 | case _PC_LINK_MAX: |
44 | #ifdef LINK_MAX |
45 | return LINK_MAX; |
46 | #else |
47 | return -1; |
48 | #endif |
49 | |
50 | case _PC_MAX_CANON: |
51 | #ifdef MAX_CANON |
52 | return MAX_CANON; |
53 | #else |
54 | return -1; |
55 | #endif |
56 | |
57 | case _PC_MAX_INPUT: |
58 | #ifdef MAX_INPUT |
59 | return MAX_INPUT; |
60 | #else |
61 | return -1; |
62 | #endif |
63 | |
64 | case _PC_NAME_MAX: |
65 | #ifdef NAME_MAX |
66 | { |
67 | struct statvfs64 sv; |
68 | int save_errno = errno; |
69 | |
70 | if (__fstatvfs64 (fd, &sv) < 0) |
71 | { |
72 | if (errno == ENOSYS) |
73 | { |
74 | __set_errno (save_errno); |
75 | return NAME_MAX; |
76 | } |
77 | else if (errno == ENODEV) |
78 | __set_errno (EINVAL); |
79 | |
80 | return -1; |
81 | } |
82 | else |
83 | { |
84 | return sv.f_namemax; |
85 | } |
86 | } |
87 | #else |
88 | return -1; |
89 | #endif |
90 | |
91 | case _PC_PATH_MAX: |
92 | #ifdef PATH_MAX |
93 | return PATH_MAX; |
94 | #else |
95 | return -1; |
96 | #endif |
97 | |
98 | case _PC_PIPE_BUF: |
99 | #ifdef PIPE_BUF |
100 | return PIPE_BUF; |
101 | #else |
102 | return -1; |
103 | #endif |
104 | |
105 | case _PC_CHOWN_RESTRICTED: |
106 | #ifdef _POSIX_CHOWN_RESTRICTED |
107 | return _POSIX_CHOWN_RESTRICTED; |
108 | #else |
109 | return -1; |
110 | #endif |
111 | |
112 | case _PC_NO_TRUNC: |
113 | #ifdef _POSIX_NO_TRUNC |
114 | return _POSIX_NO_TRUNC; |
115 | #else |
116 | return -1; |
117 | #endif |
118 | |
119 | case _PC_VDISABLE: |
120 | #ifdef _POSIX_VDISABLE |
121 | return _POSIX_VDISABLE; |
122 | #else |
123 | return -1; |
124 | #endif |
125 | |
126 | case _PC_SYNC_IO: |
127 | #ifdef _POSIX_SYNC_IO |
128 | return _POSIX_SYNC_IO; |
129 | #else |
130 | return -1; |
131 | #endif |
132 | |
133 | case _PC_ASYNC_IO: |
134 | #ifdef _POSIX_ASYNC_IO |
135 | { |
136 | /* AIO is only allowed on regular files and block devices. */ |
137 | struct stat64 st; |
138 | |
139 | if (__fxstat64 (_STAT_VER, fd, &st) < 0 |
140 | || (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode))) |
141 | return -1; |
142 | else |
143 | return 1; |
144 | } |
145 | #else |
146 | return -1; |
147 | #endif |
148 | |
149 | case _PC_PRIO_IO: |
150 | #ifdef _POSIX_PRIO_IO |
151 | return _POSIX_PRIO_IO; |
152 | #else |
153 | return -1; |
154 | #endif |
155 | |
156 | case _PC_SOCK_MAXBUF: |
157 | #ifdef SOCK_MAXBUF |
158 | return SOCK_MAXBUF; |
159 | #else |
160 | return -1; |
161 | #endif |
162 | |
163 | case _PC_FILESIZEBITS: |
164 | #ifdef FILESIZEBITS |
165 | return FILESIZEBITS; |
166 | #else |
167 | /* We let platforms with larger file sizes overwrite this value. */ |
168 | return 32; |
169 | #endif |
170 | |
171 | case _PC_REC_INCR_XFER_SIZE: |
172 | /* XXX It is not entirely clear what the limit is supposed to do. |
173 | What is incremented? */ |
174 | return -1; |
175 | |
176 | case _PC_REC_MAX_XFER_SIZE: |
177 | /* XXX It is not entirely clear what the limit is supposed to do. |
178 | In general there is no top limit of the number of bytes which |
179 | case be transported at once. */ |
180 | return -1; |
181 | |
182 | case _PC_REC_MIN_XFER_SIZE: |
183 | { |
184 | /* XXX It is not entirely clear what the limit is supposed to do. |
185 | I assume this is the block size of the filesystem. */ |
186 | struct statvfs64 sv; |
187 | |
188 | if (__fstatvfs64 (fd, &sv) < 0) |
189 | return -1; |
190 | return sv.f_bsize; |
191 | } |
192 | |
193 | case _PC_REC_XFER_ALIGN: |
194 | { |
195 | /* XXX It is not entirely clear what the limit is supposed to do. |
196 | I assume that the number should reflect the minimal block |
197 | alignment. */ |
198 | struct statvfs64 sv; |
199 | |
200 | if (__fstatvfs64 (fd, &sv) < 0) |
201 | return -1; |
202 | return sv.f_frsize; |
203 | } |
204 | |
205 | case _PC_ALLOC_SIZE_MIN: |
206 | { |
207 | /* XXX It is not entirely clear what the limit is supposed to do. |
208 | I assume that the number should reflect the minimal block |
209 | alignment. */ |
210 | struct statvfs64 sv; |
211 | |
212 | if (__fstatvfs64 (fd, &sv) < 0) |
213 | return -1; |
214 | return sv.f_frsize; |
215 | } |
216 | |
217 | case _PC_SYMLINK_MAX: |
218 | /* In general there are no limits. If a system has one it should |
219 | overwrite this case. */ |
220 | return -1; |
221 | |
222 | case _PC_2_SYMLINKS: |
223 | /* Unix systems generally have symlinks. */ |
224 | return 1; |
225 | } |
226 | } |
227 | |
228 | #undef __fpathconf |
229 | weak_alias (__fpathconf, fpathconf) |
230 | |