Short description: Cleanup use of _dl_starting_up.

Author(s): Fedora glibc team <glibc@lists.fedoraproject.org>

Origin: PATCH

Upstream status: https://sourceware.org/ml/libc-alpha/2014-02/msg00589.html

Upstream discussions:

https://sourceware.org/ml/libc-alpha/2014-02/msg00580.html

Based on the following commit:

~~~

From 16552c01a66633c9e412984d9d92616bd4e5303c Mon Sep 17 00:00:00 2001

From: Andreas Schwab <schwab@redhat.com>

Date: Fri, 11 Jun 2010 11:04:11 +0200

Subject: [PATCH] Properly set __libc_multiple_libcs

	* elf/rtld.c (_dl_starting_up): Always define.

	(dl_main): Always set _dl_starting_up.

	* elf/dl-support.c (_dl_starting_up): Always define.

	* elf/dl-init.c (_dl_init): Always clear _dl_starting_up.

---

ChangeLog        |    7 +++++++

elf/dl-init.c    |    4 ----

elf/dl-support.c |    2 --

elf/rtld.c       |    4 ----

4 files changed, 7 insertions(+), 10 deletions(-)

~~~

This patch needs to go upstream to get cleaned up, but has always involed

analysis of the GNU/Hurd parts of the change and that stalled out, but

perhaps with build-many-glibcs we can now test these changes more easily.

Index: b/elf/dl-init.c

===================================================================

--- a/elf/dl-init.c

+++ b/elf/dl-init.c

@@ -119,8 +119,6 @@ _dl_init (struct link_map *main_map, int

   while (i-- > 0)

     call_init (main_map->l_initfini[i], argc, argv, env);

-#ifndef HAVE_INLINED_SYSCALLS

   /* Finished starting up.  */

   _dl_starting_up = 0;

-#endif

 }

Index: b/elf/dl-support.c

===================================================================

--- a/elf/dl-support.c

+++ b/elf/dl-support.c

@@ -117,10 +117,8 @@ struct r_scope_elem _dl_initial_searchli

     .r_nlist = 1,

   };

-#ifndef HAVE_INLINED_SYSCALLS

 /* Nonzero during startup.  */

 int _dl_starting_up = 1;

-#endif

 /* Random data provided by the kernel.  */

 void *_dl_random;

Index: b/elf/rtld.c

===================================================================

--- a/elf/rtld.c

+++ b/elf/rtld.c

@@ -214,7 +214,6 @@ audit_list_iter_next (struct audit_list_

   return iter->previous->name;

 }

-#ifndef HAVE_INLINED_SYSCALLS

 /* Set nonzero during loading and initialization of executable and

    libraries, cleared before the executable's entry point runs.  This

    must not be initialized to nonzero, because the unused dynamic

@@ -224,7 +223,6 @@ audit_list_iter_next (struct audit_list_

    never be called.  */

 int _dl_starting_up = 0;

 rtld_hidden_def (_dl_starting_up)

-#endif

 /* This is the structure which defines all variables global to ld.so

    (except those which cannot be added for some reason).  */

@@ -898,10 +896,8 @@ dl_main (const ElfW(Phdr) *phdr,

   /* Process the environment variable which control the behaviour.  */

   process_envvars (&mode);

-#ifndef HAVE_INLINED_SYSCALLS

   /* Set up a flag which tells we are just starting.  */

   _dl_starting_up = 1;

-#endif

   if (*user_entry == (ElfW(Addr)) ENTRY_POINT)

     {