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+.\"	$NetBSD: do_setresuid.9,v 1.7 2017/10/17 21:11:36 pgoyette Exp $
+.\"
+.\"-
+.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by David Laight.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 September 28, 2003
+.Dt DO_SETRESUID 9
+.Os
+.Sh NAME
+.Nm do_setresuid ,
+.Nm do_setresgid
+.Nd set process uid and gid
+.Sh SYNOPSIS
+.In sys/ucred.h
+.Ft int
+.Fn do_setresuid "struct lwp *lwp" "uid_t ruid" "uid_t euid" "uid_t svuid" "u_int flags"
+.Ft int
+.Fn do_setresgid "struct lwp *lwp" "uid_t ruid" "uid_t euid" "uid_t svuid" "u_int flags"
+.Sh DESCRIPTION
+The
+.Nm do_setresuid
+and
+.Nm do_setresgid
+functions are used to implement the various system calls that allow a
+process to change its real, effective, and saved uid and gid values.
+.Pp
+The
+.Nm do_setresuid
+function sets the specified process's real user ID to
+.Ar ruid ,
+its effective user ID to
+.Ar euid ,
+and its saved user ID to
+.Ar svuid .
+If any of the uid arguments are \-1 then that assignment is skipped.
+.Pp
+If
+.Fn suser
+is true, then any values may be assigned, otherwise the new uid
+values must match one of the existing values and the caller must have
+set the relevant bit in
+.Ar flags .
+.Pp
+The
+.Ar flags
+argument specifies which of the existing uid values the new value must match.
+It should be set to a logical OR of ID_{R,E,S}_EQ_{R,E,S}, where ID_E_EQ_R
+means that it is valid to set the effective ID to the current value of the
+real ID.
+.Pp
+The
+.Nm do_setresgid
+function sets the group IDs but otherwise behaves in the same manner as
+.Nm .
+The processes group list is neither examined nor effected.
+.Sh CODE REFERENCES
+These functions are implemented in:
+.Pa sys/kern/kern_prot.c .
+.Sh SEE ALSO
+.Xr setregid 2 ,
+.Xr setreuid 2 ,
+.Xr setuid 2
+.Sh HISTORY
+Implemented for
+.Nx 2.0
+to replace ad-hoc code in each system call routine and in the
+various compat modules.