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Set SU_FROM environment variable. This can be used to determine a 'su -'

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shell from a real login shell (but only if you care).
This commit is contained in:
abs 2000-02-11 00:30:07 +00:00
parent f8b76eb0fd
commit ddcdaa6b45
2 changed files with 15 additions and 7 deletions
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17
usr.bin/su/su.1
View File

@ -30,7 +30,7 @@
.\" SUCH DAMAGE.
.\"
.\" from: @(#)su.1 8.2 (Berkeley) 4/18/94
.\" $NetBSD: su.1,v 1.17 2000/01/14 02:39:14 mjl Exp $
.\" $NetBSD: su.1,v 1.18 2000/02/11 00:30:07 abs Exp $
.\"
.Dd January 14, 2000
.Dt SU 1
@ -73,8 +73,9 @@ S/Key is a Trademark of Bellcore.
By default, the environment is unmodified with the exception of
.Ev USER ,
.Ev HOME ,
.Ev SHELL ,
and
.Ev SHELL .
.Ev SU_FROM .
.Ev HOME
and
.Ev SHELL
@ -82,8 +83,12 @@ are set to the target login's default values.
.Ev USER
is set to the target login, unless the target login has a user ID of 0,
in which case it is unmodified.
.Ev SU_FROM
is set to the caller's login.
The invoked shell is the target login's.
This is the traditional behavior of
With the exception of
.Ev SU_FROM
this is the traditional behavior of
.Nm "" .
.Pp
The options are as follows:
@ -106,11 +111,13 @@ The environment is discarded except for
.Ev SHELL ,
.Ev PATH ,
.Ev TERM ,
.Ev USER ,
and
.Ev USER .
.Ev SU_FROM .
.Ev HOME
.Ev SHELL ,
and
.Ev SHELL
.Ev SU_FROM
are modified as above.
.Ev USER
is set to the target login.

5
usr.bin/su/su.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: su.c,v 1.38 2000/01/25 02:19:19 mjl Exp $ */
/* $NetBSD: su.c,v 1.39 2000/02/11 00:30:07 abs Exp $ */
/*
* Copyright (c) 1988 The Regents of the University of California.
@ -44,7 +44,7 @@ __COPYRIGHT(
#if 0
static char sccsid[] = "@(#)su.c 8.3 (Berkeley) 4/2/94";*/
#else
__RCSID("$NetBSD: su.c,v 1.38 2000/01/25 02:19:19 mjl Exp $");
__RCSID("$NetBSD: su.c,v 1.39 2000/02/11 00:30:07 abs Exp $");
#endif
#endif /* not lint */
@ -351,6 +351,7 @@ badlogin:
(void)setenv("HOME", pwd->pw_dir, 1);
(void)setenv("SHELL", shell, 1);
}
(void)setenv("SU_FROM", username, 1);
if (iscsh == YES) {
if (fastlogin)