source: trunk/libs/newlib/src/newlib/libc/sys/linux/pathconf.c

Last change on this file was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 6.0 KB
Line 
1/* Linux specific extensions to pathconf.
2   Copyright (C) 1991,95,96,98,99,2000,2001 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20/* Modified for newlib July 19, 2002 - Jeff Johnston */
21
22#include <errno.h>
23#include <stddef.h>
24#include <unistd.h>
25#include <limits.h>
26#include <fcntl.h>
27#include <sys/stat.h>
28#include <sys/statfs.h>
29#include <sys/statvfs.h>
30#include <machine/weakalias.h>
31#include "linux_fsinfo.h"
32
33/* The Linux kernel header mentioned this as a kind of generic value.  */
34#define LINUX_LINK_MAX  127
35
36static long int posix_pathconf (const char *path, int name);
37
38
39/* Get file-specific information about descriptor FD.  */
40long int
41__pathconf (path, name)
42     const char *path;
43     int name;
44{
45  if (name == _PC_LINK_MAX)
46    {
47      struct statfs fsbuf;
48
49      /* Determine the filesystem type.  */
50      if (__statfs (path, &fsbuf) < 0)
51        {
52          if (errno == ENOSYS)
53            /* not possible, return the default value.  */
54            return LINUX_LINK_MAX;
55
56          /* Some error occured.  */
57          return -1;
58        }
59
60      switch (fsbuf.f_type)
61        {
62        case EXT2_SUPER_MAGIC:
63          return EXT2_LINK_MAX;
64
65        case MINIX_SUPER_MAGIC:
66        case MINIX_SUPER_MAGIC2:
67          return MINIX_LINK_MAX;
68
69        case MINIX2_SUPER_MAGIC:
70        case MINIX2_SUPER_MAGIC2:
71          return MINIX2_LINK_MAX;
72
73        case XENIX_SUPER_MAGIC:
74          return XENIX_LINK_MAX;
75
76        case SYSV4_SUPER_MAGIC:
77        case SYSV2_SUPER_MAGIC:
78          return SYSV_LINK_MAX;
79
80        case COH_SUPER_MAGIC:
81          return COH_LINK_MAX;
82
83        case UFS_MAGIC:
84        case UFS_CIGAM:
85          return UFS_LINK_MAX;
86
87        case REISERFS_SUPER_MAGIC:
88          return REISERFS_LINK_MAX;
89
90        default:
91          return LINUX_LINK_MAX;
92        }
93    }
94
95  return posix_pathconf (path, name);
96}
97
98/* Get file-specific information about PATH.  */
99static long int
100posix_pathconf (const char *path, int name)
101{
102  if (path[0] == '\0')
103    {
104      __set_errno (ENOENT);
105      return -1;
106    }
107
108  switch (name)
109    {
110    default:
111      __set_errno (EINVAL);
112      return -1;
113
114    case _PC_LINK_MAX:
115#ifdef  LINK_MAX
116      return LINK_MAX;
117#else
118      return -1;
119#endif
120
121    case _PC_MAX_CANON:
122#ifdef  MAX_CANON
123      return MAX_CANON;
124#else
125      return -1;
126#endif
127
128    case _PC_MAX_INPUT:
129#ifdef  MAX_INPUT
130      return MAX_INPUT;
131#else
132      return -1;
133#endif
134
135    case _PC_NAME_MAX:
136#ifdef  NAME_MAX
137      {
138        struct statfs buf;
139        int save_errno = errno;
140
141        if (__statfs (path, &buf) < 0)
142          {
143            if (errno == ENOSYS)
144              {
145                errno = save_errno;
146                return NAME_MAX;
147              }
148            return -1;
149          }
150        else
151          {
152#ifdef _STATFS_F_NAMELEN
153            return buf.f_namelen;
154#else
155# ifdef _STATFS_F_NAME_MAX
156            return buf.f_name_max;
157# else
158            return NAME_MAX;
159# endif
160#endif
161          }
162      }
163#else
164      return -1;
165#endif
166
167    case _PC_PATH_MAX:
168#ifdef  PATH_MAX
169      return PATH_MAX;
170#else
171      return -1;
172#endif
173
174    case _PC_PIPE_BUF:
175#ifdef  PIPE_BUF
176      return PIPE_BUF;
177#else
178      return -1;
179#endif
180
181    case _PC_CHOWN_RESTRICTED:
182#ifdef  _POSIX_CHOWN_RESTRICTED
183      return _POSIX_CHOWN_RESTRICTED;
184#else
185      return -1;
186#endif
187
188    case _PC_NO_TRUNC:
189#ifdef  _POSIX_NO_TRUNC
190      return _POSIX_NO_TRUNC;
191#else
192      return -1;
193#endif
194
195    case _PC_VDISABLE:
196#ifdef  _POSIX_VDISABLE
197      return _POSIX_VDISABLE;
198#else
199      return -1;
200#endif
201
202    case _PC_SYNC_IO:
203#ifdef  _POSIX_SYNC_IO
204      return _POSIX_SYNC_IO;
205#else
206      return -1;
207#endif
208
209    case _PC_ASYNC_IO:
210#ifdef  _POSIX_ASYNC_IO
211      {
212        /* AIO is only allowed on regular files and block devices.  */
213        struct stat64 st;
214
215        if (stat64 (path, &st) < 0
216            || (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode)))
217          return -1;
218        else
219          return 1;
220      }
221#else
222      return -1;
223#endif
224
225    case _PC_PRIO_IO:
226#ifdef  _POSIX_PRIO_IO
227      return _POSIX_PRIO_IO;
228#else
229      return -1;
230#endif
231
232    case _PC_SOCK_MAXBUF:
233#ifdef  SOCK_MAXBUF
234      return SOCK_MAXBUF;
235#else
236      return -1;
237#endif
238
239    case _PC_FILESIZEBITS:
240#ifdef FILESIZEBITS
241      return FILESIZEBITS;
242#else
243      /* We let platforms with larger file sizes overwrite this value.  */
244      return 32;
245#endif
246
247    case _PC_REC_INCR_XFER_SIZE:
248      /* XXX It is not entirely clear what the limit is supposed to do.
249         What is incremented?  */
250      return -1;
251
252    case _PC_REC_MAX_XFER_SIZE:
253      /* XXX It is not entirely clear what the limit is supposed to do.
254         In general there is no top limit of the number of bytes which
255         case be transported at once.  */
256      return -1;
257
258    case _PC_REC_MIN_XFER_SIZE:
259      {
260        /* XXX It is not entirely clear what the limit is supposed to do.
261           I assume this is the block size of the filesystem.  */
262        struct statvfs64 sv;
263
264        if (__statvfs64 (path, &sv) < 0)
265          return -1;
266        return sv.f_bsize;
267      }
268
269    case _PC_REC_XFER_ALIGN:
270      {
271        /* XXX It is not entirely clear what the limit is supposed to do.
272           I assume that the number should reflect the minimal block
273           alignment.  */
274        struct statvfs64 sv;
275
276        if (__statvfs64 (path, &sv) < 0)
277          return -1;
278        return sv.f_frsize;
279      }
280
281    case _PC_ALLOC_SIZE_MIN:
282      {
283        /* XXX It is not entirely clear what the limit is supposed to do.
284           I assume that the number should reflect the minimal block
285           alignment.  */
286        struct statvfs64 sv;
287
288        if (__statvfs64 (path, &sv) < 0)
289          return -1;
290        return sv.f_frsize;
291      }
292
293    case _PC_SYMLINK_MAX:
294      /* In general there are no limits.  If a system has one it should
295         overwrite this case.  */
296      return -1;
297    }
298}
299
300weak_alias (__pathconf, pathconf)
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