minix/lib/libc/sys/setreuid.2
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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5.1 KiB
Groff

.\" $NetBSD: setreuid.2,v 1.23 2008/05/02 18:11:05 martin Exp $
.\"
.\" Copyright (c) 1998, 2000, 2001 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Charles M. Hannum.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 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.
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.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"
.\" from: @(#)setreuid.2 6.4 (Berkeley) 3/10/91
.\"
.Dd January 5, 2001
.Dt SETREUID 2
.Os
.Sh NAME
.Nm setreuid
.Nd set real and effective user ID's
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn setreuid "uid_t ruid" "uid_t euid"
.Sh DESCRIPTION
.Bf -symbolic
This interface is made obsolete by the saved ID functionality in
.Xr setuid 2
and
.Xr seteuid 2 .
.Ef
.Pp
The real and effective user ID's of the
current process are set according to the arguments.
If the real user ID is changed, the saved user ID is changed to the new
value of the effective user ID.
.Pp
If
.Fa ruid
or
.Fa euid
is \-1, the current uid is filled in by the system.
Unprivileged users may change the real user
ID to the effective user ID, and may change the effective user ID to the
real user ID or the saved user ID; only the super-user may
make other changes.
.Pp
The
.Fn setreuid
function has been used to swap the real and effective user
IDs in set-user-ID programs to temporarily relinquish the set-user-ID
value.
This purpose is now better served by the use of the
.Fn seteuid
function (see
.Xr setuid 2 ) .
.Pp
When setting the real and effective user IDs to the same value, this
function is equivalent to the
.Fn setuid
function.
When setting only the effective user ID, this function is equivalent to
the
.Fn seteuid
function.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, a value of \-1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EPERM
The current process is not the super-user and a change
other than changing the effective user-id to the real user-id
was specified.
.El
.Sh SEE ALSO
.Xr getuid 2 ,
.Xr seteuid 2 ,
.Xr setgid 2 ,
.Xr setuid 2
.Sh HISTORY
The
.Fn setreuid
function call appeared in
.Bx 4.2 .
An incompatible version was implemented in
.Bx 4.4 .
It was reimplemented in
.Nx 1.2
in a way compatible with
.Bx 4.3 ,
SunOS and Linux, but should not be used in new code.