misc/151861: dlclose() of library causes separately opened
libraries to unload as well
Alexander Kabaev
kabaev at gmail.com
Wed Nov 3 22:00:26 UTC 2010
The following reply was made to PR misc/151861; it has been noted by GNATS.
From: Alexander Kabaev <kabaev at gmail.com>
To: Kostik Belousov <kostikbel at gmail.com>
Cc: Jaakko Heinonen <jh at freebsd.org>, bug-followup at freebsd.org,
kan at freebsd.org
Subject: Re: misc/151861: dlclose() of library causes separately opened
libraries to unload as well
Date: Wed, 3 Nov 2010 17:55:42 -0400
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On Wed, 3 Nov 2010 18:37:56 +0200
Kostik Belousov <kostikbel at gmail.com> wrote:
> On Wed, Nov 03, 2010 at 12:27:33PM -0400, Alexander Kabaev wrote:
> > On Wed, 3 Nov 2010 18:20:30 +0200
> > Kostik Belousov <kostikbel at 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.
>=20
> 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().
>=20
> 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->next) @@ -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;
This is one that is least confusing and I like it. Thanks.=20
--=20
Alexander Kabaev
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