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-.\"	$OpenBSD: issetugid.2,v 1.7 1997/02/18 00:16:09 deraadt Exp $
-.\"
-.\" Copyright (c) 1980, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.Dd August 25, 1996
-.Dt ISSETUGID 2
-.Os
-.Sh NAME
-.Nm issetugid
-.Nd is current process tainted by uid or gid changes
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn issetugid void
-.Sh DESCRIPTION
-The
-.Fn issetugid
-system call returns 1 if the process environment or memory address space
-is considered
-.Dq tainted ,
-and returns 0 otherwise.
-.Pp
-A process is tainted if it was created as a result of an
-.Xr execve 2
-system call which had either of the setuid or setgid bits set (and extra
-privileges were given as a result) or if it has changed any of its real,
-effective or saved user or group ID's since it began execution.
-.Pp
-This system call exists so that library routines (eg: libc, libtermcap)
-can reliably determine if it is safe to use information
-that was obtained from the user, in particular the results from
-.Xr getenv 3
-should be viewed with suspicion if it is used to control operation.
-.Pp
-A
-.Dq tainted
-status is inherited by child processes as a result of the
-.Xr fork 2
-system call (or other library code that calls fork, such as
-.Xr popen 3 ) .
-.Pp
-It is assumed that a program that clears all privileges as it prepares
-to execute another will also reset the environment, hence the
-.Dq tainted
-status will not be passed on.
-This is important for programs such as
-.Xr su 1
-which begin setuid but need to be able to create an untainted process.
-.Sh ERRORS
-The
-.Fn issetugid
-system call is always successful, and no return value is reserved to
-indicate an error.
-.Sh SEE ALSO
-.Xr execve 2 ,
-.Xr fork 2 ,
-.Xr setegid 2 ,
-.Xr seteuid 2 ,
-.Xr setgid 2 ,
-.Xr setregid 2 ,
-.Xr setreuid 2 ,
-.Xr setuid 2
-.Sh HISTORY
-The
-.Fn issetugid
-system call first appeared in
-.Ox 2.0
-and was also implemented in
-.Fx 3.0 .