| /* Copyright (C) 1993-2014 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <hurd.h> |
| #include <sys/types.h> |
| #include <hurd/id.h> |
| #include <string.h> |
| |
| /* Set the effective user ID of the calling process to GID. */ |
| int |
| setegid (gid) |
| gid_t gid; |
| { |
| auth_t newauth; |
| error_t err; |
| |
| HURD_CRITICAL_BEGIN; |
| __mutex_lock (&_hurd_id.lock); |
| err = _hurd_check_ids (); |
| |
| if (!err) |
| { |
| /* Make a new auth handle which has EGID as the first element in the |
| list of effective gids. */ |
| |
| if (_hurd_id.gen.ngids > 0) |
| { |
| _hurd_id.gen.gids[0] = gid; |
| _hurd_id.valid = 0; |
| } |
| |
| err = __USEPORT (AUTH, __auth_makeauth |
| (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, |
| _hurd_id.gen.uids, _hurd_id.gen.nuids, |
| _hurd_id.aux.uids, _hurd_id.aux.nuids, |
| _hurd_id.gen.ngids ? _hurd_id.gen.gids : &gid, |
| _hurd_id.gen.ngids ?: 1, |
| _hurd_id.aux.gids, _hurd_id.aux.ngids, |
| &newauth)); |
| } |
| __mutex_unlock (&_hurd_id.lock); |
| HURD_CRITICAL_END; |
| |
| if (err) |
| return __hurd_fail (err); |
| |
| /* Install the new handle and reauthenticate everything. */ |
| err = __setauth (newauth); |
| __mach_port_deallocate (__mach_task_self (), newauth); |
| return err; |
| } |
| libc_hidden_def (setegid) |
