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hack from Mike Karels to deal with the last close on a controlling 

terminal.  from 4.4BSD.
This commit is contained in:
cgd 1994-01-27 03:16:40 +00:00
parent c9c3b2abbe
commit 5e12573ac2
1 changed files with 15 additions and 1 deletions
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16
sys/miscfs/specfs/spec_vnops.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* from: @(#)spec_vnops.c 7.37 (Berkeley) 5/30/91
* $Id: spec_vnops.c,v 1.10 1993/12/22 13:14:42 cgd Exp $
* $Id: spec_vnops.c,v 1.11 1994/01/27 03:16:40 cgd Exp $
*/
#include <sys/param.h>
@ -451,6 +451,20 @@ spec_close(vp, flag, cred, p)
switch (vp->v_type) {
case VCHR:
/*
* Hack: a tty device that is a controlling terminal
* has a reference from the session structure.
* We cannot easily tell that a character device is
* a controlling terminal, unless it is the closing
* process' controlling terminal. In that case,
* if the reference count is 2 (this last descriptor
* plus the session), release the reference from the session.
*/
if (vcount(vp) == 2 && ap->a_p &&
vp == ap->a_p->p_session->s_ttyvp) {
vrele(vp);
ap->a_p->p_session->s_ttyvp = NULL;
}
/*
* If the vnode is locked, then we are in the midst
* of forcably closing the device, otherwise we only