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78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
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/* setresgid -- set effective group ID, real group ID, and saved-set group ID
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Copyright (C) 2002 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <unistd.h>
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#include <hurd.h>
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#include <hurd/id.h>
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/* Set the effective group ID, real group ID, and saved-set group ID,
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of the calling process to EGID, RGID, and SGID, respectively. */
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int
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__setresgid (gid_t egid, gid_t rgid, gid_t sgid)
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{
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auth_t newauth;
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error_t err;
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gid_t agids[2] = { rgid, sgid };
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&_hurd_id.lock);
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err = _hurd_check_ids ();
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if (!err)
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{
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/* Make a new auth handle which has EGID as the first element in the
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list of effective gids. */
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if (_hurd_id.gen.ngids > 0)
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{
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_hurd_id.gen.gids[0] = egid;
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_hurd_id.valid = 0;
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}
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if (_hurd_id.aux.ngids > 1)
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{
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_hurd_id.aux.gids[0] = rgid;
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_hurd_id.aux.gids[1] = sgid;
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_hurd_id.valid = 0;
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}
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err = __USEPORT (AUTH, __auth_makeauth
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(port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
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_hurd_id.gen.uids, _hurd_id.gen.nuids,
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_hurd_id.aux.uids, _hurd_id.aux.nuids,
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_hurd_id.gen.ngids ? _hurd_id.gen.gids : &egid,
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_hurd_id.gen.ngids ?: 1,
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_hurd_id.aux.ngids > 1 ? _hurd_id.aux.gids : agids,
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_hurd_id.aux.ngids > 1 ? _hurd_id.aux.ngids : 2,
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&newauth));
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}
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__mutex_unlock (&_hurd_id.lock);
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HURD_CRITICAL_END;
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if (err)
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return __hurd_fail (err);
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/* Install the new handle and reauthenticate everything. */
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err = __setauth (newauth);
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__mach_port_deallocate (__mach_task_self (), newauth);
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return err;
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}
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libc_hidden_def (__setresgid)
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