Implement _dl_catch_error, _dl_signal_error in libc.so [BZ #16628]

This change moves the main implementation of _dl_catch_error,
_dl_signal_error to libc.so, where TLS variables can be used
directly.  This removes a writable function pointer from the
rtld_global variable.

For use during initial relocation, minimal implementations of these
functions are provided in ld.so.  These are eventually interposed
by the libc.so implementations.  This is implemented by compiling
elf/dl-error-skeleton.c twice, via elf/dl-error.c and
elf/dl-error-minimal.c.

As a side effect of this change, the static version of dl-error.c
no longer includes support for the
_dl_signal_cerror/_dl_receive_error mechanism because it is only
used in ld.so.

1 files changed, 1 insertions, 1 deletions

diff --git a/elf/dl-close.c b/elf/dl-close.c
index 687d7de874..648970332e 100644
--- a/elf/dl-close.c
+++ b/elf/dl-close.c
@@ -814,7 +814,7 @@ _dl_close (void *_map)
     }
 
   if (__builtin_expect (map->l_direct_opencount, 1) == 0)
-    GLRO(dl_signal_error) (0, map->l_name, NULL, N_("shared object not open"));
+    _dl_signal_error (0, map->l_name, NULL, N_("shared object not open"));
 
   /* Acquire the lock.  */
   __rtld_lock_lock_recursive (GL(dl_load_lock));