compiler/clib/stat.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <dos/dos.h>
   7 #include <proto/dos.h>
   8
   9 #include <errno.h>
  10
  11 #include "__time.h"
  12 #include "__stat.h"
  13 #include "__upath.h"
  14
  15 /*****************************************************************************
  16
  17     NAME */
  18
  19 #include <sys/stat.h>
  20
  21         int stat(
  22
  23 /*  SYNOPSIS */
  24         const char *path,
  25         struct stat *sb)
  26
  27 /*  FUNCTION
  28         Returns information about a file. Information is stored in stat
  29         structure having the following fields:
  30
  31         dev_t           st_dev;     - ID of device containing the file
  32         ino_t           st_ino;     - inode number
  33         mode_t          st_mode;    - protection mode
  34         nlink_t         st_nlink;   - number of hard links
  35         uid_t           st_uid;     - user ID of the file's owner
  36         gid_t           st_gid;     - group ID of the file's group
  37         dev_t           st_rdev;    - device ID (if the file is character
  38                                       or block special file)
  39         off_t           st_size;    - file size, in bytes
  40         time_t          st_atime;   - time of last acces
  41         time_t          st_mtime;   - time of last data modification
  42         time_t          st_ctime;   - time of last file status change
  43         blksize_t       st_blksize; - optimal blocksize for I/O
  44         blkcnt_t        st_blocks;  - number of blocks allocated for file
  45
  46     INPUTS
  47         path - Pathname of the file
  48         sb - Pointer to stat structure that will be filled by the stat() call.
  49
  50     RESULT
  51         0 on success and -1 on error. If an error occurred, the global
  52         variable errno is set.
  53
  54     NOTES
  55
  56     EXAMPLE
  57
  58     BUGS
  59
  60     SEE ALSO
  61         lstat(), fstat()
  62
  63     INTERNALS
  64         Value of st_ino field is computed as hash from the canonical path of
  65         the file.
  66
  67         Values of st_atime, st_mtime and st_ctime fields are always set to
  68         the last modification date of the file.
  69
  70         There are no special files in AROS, so the st_rdev field is never
  71         filled.
  72
  73         If the given file cannot be examined because of FSA_EXAMINE not
  74         implemented in the handler, stat structure is filled with some
  75         default values. It's necessary to allow calling stat() on NIL:.
  76
  77 ******************************************************************************/
  78 {
  79     struct aroscbase *aroscbase = __GM_GetBase();
  80     int res = 0;
  81     BPTR lock;
  82
  83     /* check for empty path before potential conversion from "." to "" */
  84     if (aroscbase->acb_doupath && path && *path == '\0')
  85     {
  86         errno = ENOENT;
  87         return -1;
  88     }
  89
  90     path = __path_u2a(path);
  91     if (path == NULL)
  92         return -1;
  93
  94     lock = Lock(path, SHARED_LOCK);
  95     if (!lock)
  96     {
  97         if  (IoErr() == ERROR_OBJECT_IN_USE)
  98         {
  99             /* the file is already locked exclusively, so the only way to get
 100                info about it is to find it in the parent directory with the ExNext() function
 101             */
 102
 103             SetIoErr(0);
 104             return __stat_from_path(path, sb);
 105         }
 106
 107         errno = __arosc_ioerr2errno(IoErr());
 108         return -1;
 109     }
 110     else
 111         res = __stat(lock, sb, FALSE);
 112
 113     UnLock(lock);
 114
 115     return res;
 116 }
 117