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cleanup copyright notices on all files.  I have attempted to be accurate with
the details.  everything is now under Tatu's licence (which I copied from his
readme), and/or the core-sdi bsd-ish thing for deattack, or various openbsd
developers under a 2-term bsd licence.  We're not changing any rules, just
being accurate.

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

#ifndef UIDSWAP_H
#define UIDSWAP_H

/*
 * Temporarily changes to the given uid.  If the effective user id is not
 * root, this does nothing.  This call cannot be nested.
 */
void    temporarily_use_uid(uid_t uid);

/*
 * Restores the original effective user id after temporarily_use_uid().
 * This should only be called while temporarily_use_uid is effective.
 */
void    restore_uid();

/*
 * Permanently sets all uids to the given uid.  This cannot be called while
 * temporarily_use_uid is effective.  This must also clear any saved uids.
 */
void    permanently_set_uid(uid_t uid);

#endif				/* UIDSWAP_H */