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glibc  2.9
hurdfchdir.c
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00001 /* Change a port cell to a directory in an open file descriptor.
00002    Copyright (C) 1999, 2002 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <unistd.h>
00022 #include <hurd.h>
00023 #include <hurd/port.h>
00024 #include <hurd/fd.h>
00025 #include <fcntl.h>
00026 
00027 int
00028 _hurd_change_directory_port_from_fd (struct hurd_port *portcell, int fd)
00029 {
00030   int ret;
00031   struct hurd_fd *d = _hurd_fd_get (fd);
00032 
00033   if (!d)
00034     return __hurd_fail (EBADF);
00035 
00036   HURD_CRITICAL_BEGIN;
00037 
00038   ret = HURD_PORT_USE (&d->port,
00039                      ({
00040                       int ret;
00041                       /* We look up "." to force ENOTDIR if it's not a
00042                          directory and EACCES if we don't have search
00043                          permission.  */
00044                       file_t dir = __file_name_lookup_under (port, ".",
00045                                                         O_NOTRANS, 0);
00046                       if (dir == MACH_PORT_NULL)
00047                         ret = -1;
00048                       else
00049                         {
00050                           _hurd_port_set (portcell, dir);
00051                           ret = 0;
00052                         }
00053                       ret;
00054                      }));
00055 
00056   HURD_CRITICAL_END;
00057 
00058   return ret;
00059 }