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/* $Id: seteuid.c 3839 2000-08-29 04:50:18Z rra $
**
** Replacement for a missing seteuid.
**
** Written by Russ Allbery <rra@stanford.edu>
** This work is hereby placed in the public domain by its author.
**
** Some systems don't have seteuid but do have setreuid. setreuid with
** -1 given for the real UID is equivalent to seteuid on systems with
** POSIX saved UIDs. On systems without POSIX saved UIDs, we'd lose our
** ability to regain privileges if we just set the effective UID, so
** instead fake a saved UID by setting the real UID to the current
** effective UID, using the real UID as the saved UID.
**
** Note that swapping UIDs doesn't work on AIX, but AIX has saved UIDs.
** Note also that systems without setreuid lose, and that we assume that
** any system with seteuid has saved UIDs.
*/
#include "config.h"
#include "clibrary.h"
int
seteuid(uid_t euid)
{
int ruid;
#ifdef _POSIX_SAVED_IDS
ruid = -1;
#else
ruid = geteuid();
#endif
return setreuid(ruid, euid);
}
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