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[glibc.git] / hurd / fchroot.c
blob143ea2380733a72693746dd8a9e5926498889d45
1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <unistd.h>
20 #include <hurd.h>
21 #include <hurd/fd.h>
22 #include <fcntl.h>
24 /* Change the current root directory to FD. */
25 int
26 fchroot (int fd)
28 error_t err;
29 file_t dir;
31 err = HURD_DPORT_USE (fd,
33 dir = __file_name_lookup_under (port, "", O_EXEC, 0);
34 dir == MACH_PORT_NULL ? errno : 0;
35 }));
37 if (! err)
39 file_t root;
40 err = __file_reparent (dir, MACH_PORT_NULL, &root);
41 __mach_port_deallocate (__mach_task_self (), dir);
42 if (! err)
43 _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root);
46 return err ? __hurd_fail (err) : 0;