The following reply was made to PR misc/151861; it has been noted by GNATS.
From: Kostik Belousov <kostik...@gmail.com>
To: Alexander Kabaev <kab...@gmail.com>
Cc: Jaakko Heinonen <j...@freebsd.org>,
Arjan van Leeuwen <freebsd-maintai...@opera.com>,
bug-follo...@freebsd.org, k...@freebsd.org
Subject: Re: misc/151861: dlclose() of library causes separately opened
libraries to unload as well
Date: Wed, 3 Nov 2010 18:37:56 +0200
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On Wed, Nov 03, 2010 at 12:27:33PM -0400, Alexander Kabaev wrote:
> On Wed, 3 Nov 2010 18:20:30 +0200
> Kostik Belousov <kostik...@gmail.com> wrote:
> ...
> > ready initialized DAGs but feel free to do whatever you think is
> > > best. =20
> > I do not like it too, but this is the current interface of init_dag().
> > Intermediate version of the latest patch removed the ref_dag() part
> > from init_dag(). Would you prefer this ?
>=20
> I would, but I lack time following all the patch versions flying
> around, so I am not sure I am talking about the right one.
By intermediate I mean private intermediate state in my working tree.
Below is the patch augmented with the change to not call ref_dag()
from init_dag().
diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
index f1ffc3e..b5fb6e1 100644
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -1276,7 +1276,7 @@ init_dag(Obj_Entry *root)
DoneList donelist;
=20
if (root->dag_inited)
- return;
+ return;
donelist_init(&donelist);
init_dag1(root, root, &donelist);
root->dag_inited =3D true;
@@ -1290,7 +1290,6 @@ init_dag1(Obj_Entry *root, Obj_Entry *obj, DoneList *=
dlp)
if (donelist_check(dlp, obj))
return;
=20
- obj->refcount++;
objlist_push_tail(&obj->dldags, root);
objlist_push_tail(&root->dagmembers, obj);
for (needed =3D obj->needed; needed !=3D NULL; needed =3D needed->ne=
xt)
@@ -2031,6 +2030,7 @@ dlopen(const char *name, int mode)
assert(*old_obj_tail =3D=3D obj);
result =3D load_needed_objects(obj, RTLD_LO_DLOPEN);
init_dag(obj);
+ ref_dag(obj);
if (result !=3D -1)
result =3D rtld_verify_versions(&obj->dagmembers);
if (result !=3D -1 && ld_tracing)
@@ -2054,10 +2054,8 @@ dlopen(const char *name, int mode)
* already loaded as a dependency, initialize the dag
* starting at it.
*/
- if (obj->dl_refcount =3D=3D 1)
- init_dag(obj);
- else
- ref_dag(obj);
+ init_dag(obj);
+ ref_dag(obj);
=20
if (ld_tracing)
goto trace;
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