compiler/clib/lstat.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/debug.h>
   7
   8 #include <dos/filesystem.h>
   9 #include <proto/dos.h>
  10
  11 #include <errno.h>
  12
  13 #include "__arosc_privdata.h"
  14 #include "__errno.h"
  15 #include "__filesystem_support.h"
  16 #include "__stat.h"
  17 #include "__upath.h"
  18
  19 /* like Dos_Lock() but no automatic soft link resolution */
  20 static BPTR __lock(
  21     const char* name,
  22     LONG        accessMode);
  23
  24 /*****************************************************************************
  25
  26     NAME */
  27
  28 #include <sys/stat.h>
  29
  30         int lstat(
  31
  32 /*  SYNOPSIS */
  33         const char  *path,
  34         struct stat *sb)
  35
  36 /*  FUNCTION
  37         Returns information about a file like stat does except that lstat
  38         does not follow symbolic links. Information is stored in stat
  39         structure. Consult stat() documentation for detailed description
  40         of that structure.
  41
  42     INPUTS
  43         path - Pathname of the file
  44         sb - Pointer to stat structure that will be filled by the lstat() call.
  45
  46     RESULT
  47         0 on success and -1 on error. If an error occurred, the global
  48         variable errno is set.
  49
  50     NOTES
  51
  52     EXAMPLE
  53
  54     BUGS
  55
  56     SEE ALSO
  57         stat(), fstat()
  58
  59     INTERNALS
  60         Consult stat() documentation for details.
  61
  62 ******************************************************************************/
  63 {
  64     int res = 0;
  65     BPTR lock;
  66
  67     /* check for empty path before potential conversion from "." to "" */
  68     if (__doupath && path && *path == '\0')
  69     {
  70         errno = ENOENT;
  71         return -1;
  72     }
  73
  74     path = __path_u2a(path);
  75     if (path == NULL)
  76         return -1;
  77
  78     lock = __lock(path, SHARED_LOCK);
  79     if (!lock)
  80     {
  81         if (   IoErr() == ERROR_IS_SOFT_LINK
  82             || IoErr() == ERROR_OBJECT_IN_USE)
  83         {
  84             /* either the file is already locked exclusively
  85                or it is a soft link, in both cases only way
  86                to get info about it is to find it in the
  87                parent directory with the ExNext() function
  88             */
  89
  90             SetIoErr(0);
  91             return __stat_from_path(path, sb);
  92         }
  93
  94         errno = IoErr2errno(IoErr());
  95         return -1;
  96     }
  97     else
  98         res = __stat(lock, sb, FALSE);
  99
 100     UnLock(lock);
 101
 102     return res;
 103 }
 104
 105 static BPTR __lock(
 106     const char* name,
 107     LONG        accessMode)
 108 {
 109     return Lock(name, accessMode);
 110 }