glibc/sysdeps/mach/hurd/chroot.c
Mark Kettenis db11c38c4d * sysdeps/mach/hurd/chroot.c (chroot): Revert 1999-02-27 changes, but change looking up the initial directory port in a similar way as done by _hurd_change_directory_port_from_name. * hurd/fchroot.c (fchroot): Likewise.
2001-01-19  Mark Kettenis  <kettenis@gnu.org>

	* sysdeps/mach/hurd/chroot.c (chroot): Revert 1999-02-27 changes,
	but change looking up the initial directory port in a similar way
	as done by _hurd_change_directory_port_from_name.
	* hurd/fchroot.c (fchroot): Likewise.
2001-01-19 09:37:23 +00:00

64 lines
2.0 KiB
C

/* Copyright (C) 1991,92,93,94,95,97,99,2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <string.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/port.h>
/* Make PATH be the root directory (the starting point for absolute
paths). Note that while on traditional UNIX systems this call is
restricted to the super-user, it isn't on the Hurd. */
int
chroot (const char *path)
{
const char *lookup;
size_t len;
file_t dir, root;
error_t err;
/* Append trailing "/." to directory name to force ENOTDIR if it's not a
directory and EACCES if we don't have search permission. */
len = strlen (path);
if (path[len - 2] == '/' && path[len - 1] == '.')
lookup = path;
else
{
char *n = alloca (len + 2);
memcpy (n, path, len);
n[len] = '/';
n[len + 1] = '.';
n[len + 2] = '\0';
lookup = n;
}
dir = __file_name_lookup (lookup, 0, 0);
if (dir == MACH_PORT_NULL)
return -1;
/* Prevent going through DIR's .. */
err = __file_reparent (dir, MACH_PORT_NULL, &root);
__mach_port_deallocate (__mach_task_self (), dir);
if (err)
return __hurd_fail (err);
_hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root);
return 0;
}