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66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <unistd.h>
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#include <hurd.h>
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#include <hurd/port.h>
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/* Make PATH be the root directory (the starting point for absolute
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paths). Note that while on traditional UNIX systems this call is
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restricted to the super-user, it isn't on the Hurd. */
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int
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chroot (const char *path)
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{
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const char *lookup;
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size_t len;
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file_t dir, root;
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error_t err;
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/* Append trailing "/." to directory name to force ENOTDIR if it's not a
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directory and EACCES if we don't have search permission. */
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len = strlen (path);
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if (len >= 2 && path[len - 2] == '/' && path[len - 1] == '.')
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lookup = path;
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else if (len == 0)
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/* Special-case empty file name according to POSIX. */
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return __hurd_fail (ENOENT);
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else
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{
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char *n = alloca (len + 3);
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memcpy (n, path, len);
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n[len] = '/';
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n[len + 1] = '.';
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n[len + 2] = '\0';
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lookup = n;
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}
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dir = __file_name_lookup (lookup, 0, 0);
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if (dir == MACH_PORT_NULL)
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return -1;
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/* Prevent going through DIR's .. */
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err = __file_reparent (dir, MACH_PORT_NULL, &root);
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__mach_port_deallocate (__mach_task_self (), dir);
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if (err)
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return __hurd_fail (err);
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_hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root);
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return 0;
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}
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