compiler/clib/chown.c

   1 /*
   2     Copyright © 1995-2009, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/debug.h>
   7
   8 #include <proto/dos.h>
   9
  10 #include <errno.h>
  11
  12 #include "__arosc_privdata.h"
  13 #include "__errno.h"
  14 #include "__upath.h"
  15
  16 /*****************************************************************************
  17
  18     NAME */
  19 #include <unistd.h>
  20
  21         int chown(
  22
  23 /*  SYNOPSIS */
  24         const char *path,
  25         uid_t      owner,
  26         gid_t      group)
  27
  28 /*  FUNCTION
  29         Change the user and group ownership of a file.
  30
  31     INPUTS
  32         path  - the path to file
  33         owner - new owner ID
  34         group - new group ID
  35
  36     RESULT
  37         0 on success and -1 on error. If an error occurred, the global
  38         variable errno is set.
  39
  40     NOTES
  41         This implementation was done by looking at Olaf 'Olsen' Barthels
  42         clib2.
  43
  44     EXAMPLE
  45
  46     BUGS
  47
  48     SEE ALSO
  49
  50     INTERNALS
  51
  52 ******************************************************************************/
  53 {
  54     int                  res     = -1;
  55     BPTR                 lock    = BNULL;
  56     struct FileInfoBlock *fib    = NULL;
  57     BOOL                 changed = TRUE;
  58
  59     /* check for empty path before potential conversion from "." to "" */
  60     if (__doupath && path && *path == '\0')
  61     {
  62         errno = ENOENT;
  63         goto out;
  64     }
  65
  66     path = __path_u2a(path);
  67     if (path == NULL)
  68         goto out;
  69
  70     /* should some id not be changed */
  71     if (owner == -1 || group == -1)
  72     {
  73         if (!(fib = AllocDosObject(DOS_FIB, NULL)))
  74         {
  75             errno = IoErr2errno(IoErr());
  76             goto out;
  77         }
  78
  79         if (!(lock = Lock(path, SHARED_LOCK)) || !Examine(lock, fib))
  80         {
  81             errno = IoErr2errno(IoErr());
  82             goto out;
  83         }
  84
  85         /* set to previous id */
  86         if (owner == -1)
  87             owner = fib->fib_OwnerUID;
  88
  89         if (group == -1)
  90             group = fib->fib_OwnerGID;
  91
  92         if (owner == fib->fib_OwnerUID && group == fib->fib_OwnerGID)
  93             changed = FALSE;
  94     }
  95
  96     if (owner > 65535 || group > 65535)
  97     {
  98         errno = EINVAL;
  99         goto out;
 100     }
 101
 102     if (changed && !SetOwner(path, owner << 16 | group))
 103     {
 104         errno = IoErr2errno(IoErr());
 105         goto out;
 106     }
 107
 108     res = 0;
 109
 110 out:
 111
 112     if (fib)
 113         FreeDosObject(DOS_FIB, fib);
 114
 115     if (lock)
 116         UnLock(lock);
 117
 118     return res;
 119 }