compiler/posixc/chdir.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     POSIX.1-2008 function chdir().
   6 */
   7
   8 #include "__posixc_intbase.h"
   9
  10 #include <exec/types.h>
  11 #include <dos/dos.h>
  12 #include <proto/dos.h>
  13 #include <aros/symbolsets.h>
  14 #include <errno.h>
  15 #include "__upath.h"
  16
  17 /*****************************************************************************
  18
  19     NAME */
  20 #include <unistd.h>
  21
  22         int chdir(
  23
  24 /*  SYNOPSIS */
  25         const char *path )
  26
  27 /*  FUNCTION
  28         Change the current working directory to the one specified by path.
  29
  30     INPUTS
  31         path - Path of the directory to change to.
  32
  33     RESULT
  34         If the current directory was changed successfully, zero is returned.
  35         Otherwise, -1 is returned and errno set apropriately.
  36
  37     NOTES
  38         At program exit, the current working directory will be changed back
  39         to the one that was current when the program first started. If you
  40         do not desire this behaviour, use dos.library/CurrentDir() instead.
  41         The path given to chdir can be translated so that getcwd gives back
  42         a string that is not the same but points to th same directory. For
  43         example, assigns are replaced by the path where the assign points to
  44         and device names (like DH0:) are replaced with the volume name
  45         (e.g. Workbench:).
  46
  47     EXAMPLE
  48
  49     BUGS
  50
  51     SEE ALSO
  52
  53     INTERNALS
  54
  55 ******************************************************************************/
  56 {
  57     struct PosixCIntBase *PosixCBase =
  58         (struct PosixCIntBase *)__aros_getbase_PosixCBase();
  59     BPTR oldlock;
  60     BPTR newlock;
  61
  62     path = __path_u2a(path);
  63
  64     if (path == NULL)
  65         return -1;
  66
  67     newlock = Lock( path, SHARED_LOCK );
  68
  69     if( newlock == BNULL )
  70     {
  71         errno = __stdc_ioerr2errno( IoErr() );
  72         goto error;
  73     }
  74
  75     oldlock = CurrentDir( newlock );
  76
  77     if( PosixCBase->cd_changed )
  78     {
  79         UnLock( oldlock );
  80     }
  81     else
  82     {
  83         PosixCBase->cd_changed = TRUE;
  84         PosixCBase->cd_lock    = oldlock;
  85     }
  86
  87     return 0;
  88
  89 error:
  90     if( newlock != BNULL ) UnLock( newlock );
  91
  92     return -1;
  93 }
  94
  95 int __init_chdir(struct PosixCIntBase *PosixCBase)
  96 {
  97     PosixCBase->cd_changed = FALSE;
  98
  99     return 1;
 100 }
 101
 102 void __exit_chdir(struct PosixCIntBase *PosixCBase)
 103 {
 104     if( PosixCBase->cd_changed )
 105     {
 106         BPTR lock = CurrentDir( PosixCBase->cd_lock );
 107
 108         UnLock( lock );
 109     }
 110 }
 111
 112 ADD2OPENLIB(__init_chdir, -100);
 113 ADD2CLOSELIB(__exit_chdir, -100);