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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [pathconf.c] - Blame information for rev 158

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/* Linux specific extensions to pathconf.
   Copyright (C) 1991,95,96,98,99,2000,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
 
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
 
   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */
 
/* Modified for newlib July 19, 2002 - Jeff Johnston */
 
#include <errno.h>
#include <stddef.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
#include <machine/weakalias.h>
#include "linux_fsinfo.h"
 
/* The Linux kernel header mentioned this as a kind of generic value.  */
#define LINUX_LINK_MAX  127
 
static long int posix_pathconf (const char *path, int name);
 
 
/* Get file-specific information about descriptor FD.  */
long int
__pathconf (path, name)
     const char *path;
     int name;
{
  if (name == _PC_LINK_MAX)
    {
      struct statfs fsbuf;
 
      /* Determine the filesystem type.  */
      if (__statfs (path, &fsbuf) < 0)
        {
          if (errno == ENOSYS)
            /* not possible, return the default value.  */
            return LINUX_LINK_MAX;
 
          /* Some error occured.  */
          return -1;
        }
 
      switch (fsbuf.f_type)
        {
        case EXT2_SUPER_MAGIC:
          return EXT2_LINK_MAX;
 
        case MINIX_SUPER_MAGIC:
        case MINIX_SUPER_MAGIC2:
          return MINIX_LINK_MAX;
 
        case MINIX2_SUPER_MAGIC:
        case MINIX2_SUPER_MAGIC2:
          return MINIX2_LINK_MAX;
 
        case XENIX_SUPER_MAGIC:
          return XENIX_LINK_MAX;
 
        case SYSV4_SUPER_MAGIC:
        case SYSV2_SUPER_MAGIC:
          return SYSV_LINK_MAX;
 
        case COH_SUPER_MAGIC:
          return COH_LINK_MAX;
 
        case UFS_MAGIC:
        case UFS_CIGAM:
          return UFS_LINK_MAX;
 
        case REISERFS_SUPER_MAGIC:
          return REISERFS_LINK_MAX;
 
        default:
          return LINUX_LINK_MAX;
        }
    }
 
  return posix_pathconf (path, name);
}
 
/* Get file-specific information about PATH.  */
static long int
posix_pathconf (const char *path, int name)
{
  if (path[0] == '\0')
    {
      __set_errno (ENOENT);
      return -1;
    }
 
  switch (name)
    {
    default:
      __set_errno (EINVAL);
      return -1;
 
    case _PC_LINK_MAX:
#ifdef  LINK_MAX
      return LINK_MAX;
#else
      return -1;
#endif
 
    case _PC_MAX_CANON:
#ifdef  MAX_CANON
      return MAX_CANON;
#else
      return -1;
#endif
 
    case _PC_MAX_INPUT:
#ifdef  MAX_INPUT
      return MAX_INPUT;
#else
      return -1;
#endif
 
    case _PC_NAME_MAX:
#ifdef  NAME_MAX
      {
        struct statfs buf;
        int save_errno = errno;
 
        if (__statfs (path, &buf) < 0)
          {
            if (errno == ENOSYS)
              {
                errno = save_errno;
                return NAME_MAX;
              }
            return -1;
          }
        else
          {
#ifdef _STATFS_F_NAMELEN
            return buf.f_namelen;
#else
# ifdef _STATFS_F_NAME_MAX
            return buf.f_name_max;
# else
            return NAME_MAX;
# endif
#endif
          }
      }
#else
      return -1;
#endif
 
    case _PC_PATH_MAX:
#ifdef  PATH_MAX
      return PATH_MAX;
#else
      return -1;
#endif
 
    case _PC_PIPE_BUF:
#ifdef  PIPE_BUF
      return PIPE_BUF;
#else
      return -1;
#endif
 
    case _PC_CHOWN_RESTRICTED:
#ifdef  _POSIX_CHOWN_RESTRICTED
      return _POSIX_CHOWN_RESTRICTED;
#else
      return -1;
#endif
 
    case _PC_NO_TRUNC:
#ifdef  _POSIX_NO_TRUNC
      return _POSIX_NO_TRUNC;
#else
      return -1;
#endif
 
    case _PC_VDISABLE:
#ifdef  _POSIX_VDISABLE
      return _POSIX_VDISABLE;
#else
      return -1;
#endif
 
    case _PC_SYNC_IO:
#ifdef  _POSIX_SYNC_IO
      return _POSIX_SYNC_IO;
#else
      return -1;
#endif
 
    case _PC_ASYNC_IO:
#ifdef  _POSIX_ASYNC_IO
      {
        /* AIO is only allowed on regular files and block devices.  */
        struct stat64 st;
 
        if (stat64 (path, &st) < 0
            || (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode)))
          return -1;
        else
          return 1;
      }
#else
      return -1;
#endif
 
    case _PC_PRIO_IO:
#ifdef  _POSIX_PRIO_IO
      return _POSIX_PRIO_IO;
#else
      return -1;
#endif
 
    case _PC_SOCK_MAXBUF:
#ifdef  SOCK_MAXBUF
      return SOCK_MAXBUF;
#else
      return -1;
#endif
 
    case _PC_FILESIZEBITS:
#ifdef FILESIZEBITS
      return FILESIZEBITS;
#else
      /* We let platforms with larger file sizes overwrite this value.  */
      return 32;
#endif
 
    case _PC_REC_INCR_XFER_SIZE:
      /* XXX It is not entirely clear what the limit is supposed to do.
         What is incremented?  */
      return -1;
 
    case _PC_REC_MAX_XFER_SIZE:
      /* XXX It is not entirely clear what the limit is supposed to do.
         In general there is no top limit of the number of bytes which
         case be transported at once.  */
      return -1;
 
    case _PC_REC_MIN_XFER_SIZE:
      {
        /* XXX It is not entirely clear what the limit is supposed to do.
           I assume this is the block size of the filesystem.  */
        struct statvfs64 sv;
 
        if (__statvfs64 (path, &sv) < 0)
          return -1;
        return sv.f_bsize;
      }
 
    case _PC_REC_XFER_ALIGN:
      {
        /* XXX It is not entirely clear what the limit is supposed to do.
           I assume that the number should reflect the minimal block
           alignment.  */
        struct statvfs64 sv;
 
        if (__statvfs64 (path, &sv) < 0)
          return -1;
        return sv.f_frsize;
      }
 
    case _PC_ALLOC_SIZE_MIN:
      {
        /* XXX It is not entirely clear what the limit is supposed to do.
           I assume that the number should reflect the minimal block
           alignment.  */
        struct statvfs64 sv;
 
        if (__statvfs64 (path, &sv) < 0)
          return -1;
        return sv.f_frsize;
      }
 
    case _PC_SYMLINK_MAX:
      /* In general there are no limits.  If a system has one it should
         overwrite this case.  */
      return -1;
    }
}
 
weak_alias (__pathconf, pathconf)

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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [pathconf.c] - Blame information for rev 158

Line No.	Rev	Author	Line
1	148	jeremybenn	`/* 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
36			`static long int posix_pathconf (const char *path, int name);`
37
38
39			`/* Get file-specific information about descriptor FD. */`
40			`long 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. */`
99			`static long int`
100			`posix_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
300			`weak_alias (__pathconf, pathconf)`