84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/* Copyright (C) 1991, 1992 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <unistd.h>
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/* Set the user ID of the calling process to UID.
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If the calling process is the super-user, the real
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and effective user IDs, and the saved set-user-ID to UID;
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if not, the effective user ID is set to UID. */
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int
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DEFUN(__setuid, (uid), uid_t uid)
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{
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auth_t newauth;
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int i;
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__mutex_lock (&_hurd_idlock);
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if (!_hurd_id_valid)
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{
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error_t err = _HURD_PORT_USE (&_hurd_auth,
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__auth_getids (port, &_hurd_id));
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if (err)
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{
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__mutex_unlock (&_hurd_idlock);
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return __hurd_fail (err);
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}
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_hurd_id_valid = 1;
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}
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for (i = 0; i < _hurd_id.nuids; ++i)
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if (_hurd_id.uids[i] == uid)
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{
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/* We already have this uid. Swap it with uids[0]
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so geteuid will return it. */
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_hurd_id.uids[i] = _hurd_id.uids[0];
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break;
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}
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if (i == _hurd_id.nuids)
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{
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if (_hurd_id.nuids == sizeof (_hurd_id.uids) / sizeof (_hurd_id.uids[0]))
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{
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__mutex_unlock (&_hurd_idlock);
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errno = ENOMEM; /* ? */
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return -1;
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}
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else
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{
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_hurd_id.uids[_hurd_id.nuids++] = _hurd_id.uids[0];
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_hurd_id.uids[0] = uid;
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}
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}
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_hurd_id.ruid = _hurd_id.uids[0];
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err = _HURD_PORT_USE (&_hurd_auth,
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__auth_makeauth (port, &_hurd_id, &newauth));
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_hurd_id_valid = 0;
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__mutex_unlock (&_hurd_idlock);
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if (err)
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return __hurd_fail (err);
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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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