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b168057a | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
68dbb3a6 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
68dbb3a6 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
68dbb3a6 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <stddef.h> | |
20 | #include <unistd.h> | |
21 | #include <limits.h> | |
bc183edc | 22 | #include <sys/stat.h> |
0e3426bb | 23 | #include <sys/statfs.h> |
c1fac803 | 24 | #include <sys/statvfs.h> |
28f540f4 RM |
25 | |
26 | ||
27 | /* Get file-specific information about descriptor FD. */ | |
28 | long int | |
c4029823 UD |
29 | __fpathconf (fd, name) |
30 | int fd; | |
31 | int name; | |
28f540f4 RM |
32 | { |
33 | if (fd < 0) | |
34 | { | |
c4029823 | 35 | __set_errno (EBADF); |
28f540f4 RM |
36 | return -1; |
37 | } | |
38 | ||
39 | switch (name) | |
40 | { | |
41 | default: | |
c4029823 | 42 | __set_errno (EINVAL); |
28f540f4 RM |
43 | return -1; |
44 | ||
45 | case _PC_LINK_MAX: | |
46 | #ifdef LINK_MAX | |
47 | return LINK_MAX; | |
48 | #else | |
28f540f4 RM |
49 | return -1; |
50 | #endif | |
51 | ||
52 | case _PC_MAX_CANON: | |
53 | #ifdef MAX_CANON | |
54 | return MAX_CANON; | |
55 | #else | |
28f540f4 RM |
56 | return -1; |
57 | #endif | |
58 | ||
59 | case _PC_MAX_INPUT: | |
60 | #ifdef MAX_INPUT | |
61 | return MAX_INPUT; | |
62 | #else | |
28f540f4 RM |
63 | return -1; |
64 | #endif | |
65 | ||
66 | case _PC_NAME_MAX: | |
67 | #ifdef NAME_MAX | |
0e3426bb RM |
68 | { |
69 | struct statfs buf; | |
2eb45444 | 70 | int save_errno = errno; |
0e3426bb RM |
71 | |
72 | if (__fstatfs (fd, &buf) < 0) | |
2eb45444 UD |
73 | { |
74 | if (errno == ENOSYS) | |
75 | { | |
9271a050 | 76 | __set_errno (save_errno); |
2eb45444 UD |
77 | return NAME_MAX; |
78 | } | |
9271a050 UD |
79 | else if (errno == ENODEV) |
80 | __set_errno (EINVAL); | |
81 | ||
2eb45444 UD |
82 | return -1; |
83 | } | |
0e3426bb | 84 | else |
a808d541 UD |
85 | { |
86 | #ifdef _STATFS_F_NAMELEN | |
87 | return buf.f_namelen; | |
88 | #else | |
89 | # ifdef _STATFS_F_NAME_MAX | |
90 | return buf.f_name_max; | |
91 | # else | |
92 | return NAME_MAX; | |
93 | # endif | |
94 | #endif | |
95 | } | |
0e3426bb | 96 | } |
2303f5fd | 97 | #else |
2303f5fd UD |
98 | return -1; |
99 | #endif | |
100 | ||
101 | case _PC_PATH_MAX: | |
102 | #ifdef PATH_MAX | |
103 | return PATH_MAX; | |
28f540f4 | 104 | #else |
28f540f4 RM |
105 | return -1; |
106 | #endif | |
107 | ||
108 | case _PC_PIPE_BUF: | |
109 | #ifdef PIPE_BUF | |
110 | return PIPE_BUF; | |
111 | #else | |
28f540f4 RM |
112 | return -1; |
113 | #endif | |
114 | ||
115 | case _PC_CHOWN_RESTRICTED: | |
116 | #ifdef _POSIX_CHOWN_RESTRICTED | |
117 | return _POSIX_CHOWN_RESTRICTED; | |
118 | #else | |
119 | return -1; | |
120 | #endif | |
121 | ||
122 | case _PC_NO_TRUNC: | |
123 | #ifdef _POSIX_NO_TRUNC | |
124 | return _POSIX_NO_TRUNC; | |
125 | #else | |
126 | return -1; | |
127 | #endif | |
128 | ||
129 | case _PC_VDISABLE: | |
130 | #ifdef _POSIX_VDISABLE | |
131 | return _POSIX_VDISABLE; | |
132 | #else | |
133 | return -1; | |
134 | #endif | |
75cd5204 RM |
135 | |
136 | case _PC_SYNC_IO: | |
137 | #ifdef _POSIX_SYNC_IO | |
138 | return _POSIX_SYNC_IO; | |
139 | #else | |
140 | return -1; | |
141 | #endif | |
142 | ||
143 | case _PC_ASYNC_IO: | |
144 | #ifdef _POSIX_ASYNC_IO | |
bc183edc UD |
145 | { |
146 | /* AIO is only allowed on regular files and block devices. */ | |
147 | struct stat64 st; | |
148 | ||
149 | if (__fxstat64 (_STAT_VER, fd, &st) < 0 | |
150 | || (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode))) | |
151 | return -1; | |
152 | else | |
153 | return 1; | |
154 | } | |
75cd5204 RM |
155 | #else |
156 | return -1; | |
157 | #endif | |
158 | ||
159 | case _PC_PRIO_IO: | |
160 | #ifdef _POSIX_PRIO_IO | |
161 | return _POSIX_PRIO_IO; | |
162 | #else | |
163 | return -1; | |
164 | #endif | |
503054c0 RM |
165 | |
166 | case _PC_SOCK_MAXBUF: | |
167 | #ifdef SOCK_MAXBUF | |
168 | return SOCK_MAXBUF; | |
169 | #else | |
503054c0 RM |
170 | return -1; |
171 | #endif | |
e918a7fe UD |
172 | |
173 | case _PC_FILESIZEBITS: | |
174 | #ifdef FILESIZEBITS | |
175 | return FILESIZEBITS; | |
176 | #else | |
177 | /* We let platforms with larger file sizes overwrite this value. */ | |
178 | return 32; | |
179 | #endif | |
87d2f3f0 UD |
180 | |
181 | case _PC_REC_INCR_XFER_SIZE: | |
182 | /* XXX It is not entirely clear what the limit is supposed to do. | |
183 | What is incremented? */ | |
184 | return -1; | |
185 | ||
186 | case _PC_REC_MAX_XFER_SIZE: | |
187 | /* XXX It is not entirely clear what the limit is supposed to do. | |
188 | In general there is no top limit of the number of bytes which | |
189 | case be transported at once. */ | |
190 | return -1; | |
191 | ||
192 | case _PC_REC_MIN_XFER_SIZE: | |
193 | { | |
194 | /* XXX It is not entirely clear what the limit is supposed to do. | |
195 | I assume this is the block size of the filesystem. */ | |
196 | struct statvfs64 sv; | |
197 | ||
198 | if (__fstatvfs64 (fd, &sv) < 0) | |
199 | return -1; | |
200 | return sv.f_bsize; | |
201 | } | |
202 | ||
203 | case _PC_REC_XFER_ALIGN: | |
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 (__fstatvfs64 (fd, &sv) < 0) | |
211 | return -1; | |
212 | return sv.f_frsize; | |
213 | } | |
a3bbce5b UD |
214 | |
215 | case _PC_ALLOC_SIZE_MIN: | |
216 | { | |
217 | /* XXX It is not entirely clear what the limit is supposed to do. | |
218 | I assume that the number should reflect the minimal block | |
219 | alignment. */ | |
220 | struct statvfs64 sv; | |
221 | ||
222 | if (__fstatvfs64 (fd, &sv) < 0) | |
223 | return -1; | |
224 | return sv.f_frsize; | |
225 | } | |
226 | ||
227 | case _PC_SYMLINK_MAX: | |
228 | /* In general there are no limits. If a system has one it should | |
229 | overwrite this case. */ | |
230 | return -1; | |
564cd8b6 UD |
231 | |
232 | case _PC_2_SYMLINKS: | |
233 | /* Unix systems generally have symlinks. */ | |
234 | return 1; | |
28f540f4 | 235 | } |
28f540f4 RM |
236 | } |
237 | ||
e918a7fe | 238 | #undef __fpathconf |
28f540f4 | 239 | weak_alias (__fpathconf, fpathconf) |