elf: Introduce to _dl_call_fini

This consolidates the destructor invocations from _dl_fini and
dlclose.  Remove the micro-optimization that avoids
calling _dl_call_fini if they are no destructors (as dlclose is quite
expensive anyway).  The debug log message is now printed
unconditionally.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 0223aa9f12..2747f88d0e 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -105,6 +105,9 @@ typedef struct link_map *lookup_t;
    DT_PREINIT_ARRAY.  */
 typedef void (*dl_init_t) (int, char **, char **);
 
+/* Type of a constructor function, in DT_FINI, DT_FINI_ARRAY.  */
+typedef void (*fini_t) (void);
+
 /* On some architectures a pointer to a function is not just a pointer
    to the actual code of the function but rather an architecture
    specific descriptor. */
@@ -1048,6 +1051,11 @@ extern void _dl_init (struct link_map *main_map, int argc, char **argv,
    initializer functions have completed.  */
 extern void _dl_fini (void) attribute_hidden;
 
+/* Invoke the DT_FINI_ARRAY and DT_FINI destructors for MAP, which
+   must be a struct link_map *.  Can be used as an argument to
+   _dl_catch_exception.  */
+void _dl_call_fini (void *map) attribute_hidden;
+
 /* Sort array MAPS according to dependencies of the contained objects.
    If FORCE_FIRST, MAPS[0] keeps its place even if the dependencies
    say otherwise.  */