From 56801c50d497685de85b1901193c9c79fadb513c Mon Sep 17 00:00:00 2001 From: Andreas Schwab Date: Tue, 21 Sep 2010 13:52:12 -0700 Subject: Move freeres function from ld.so to libc.so. --- elf/dl-libc.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 87 insertions(+), 16 deletions(-) (limited to 'elf/dl-libc.c') diff --git a/elf/dl-libc.c b/elf/dl-libc.c index 5e303f29cb..771c9c1f91 100644 --- a/elf/dl-libc.c +++ b/elf/dl-libc.c @@ -1,5 +1,5 @@ /* Handle loading and unloading shared objects for internal libc purposes. - Copyright (C) 1999-2002,2004,2005,2006,2009 Free Software Foundation, Inc. + Copyright (C) 1999-2002,2004-2006,2009,2010 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Zack Weinberg , 1999. @@ -221,6 +221,34 @@ __libc_dlclose (void *map) libc_hidden_def (__libc_dlclose) +static bool __libc_freeres_fn_section +free_slotinfo (struct dtv_slotinfo_list **elemp) +{ + size_t cnt; + + if (*elemp == NULL) + /* Nothing here, all is removed (or there never was anything). */ + return true; + + if (!free_slotinfo (&(*elemp)->next)) + /* We cannot free the entry. */ + return false; + + /* That cleared our next pointer for us. */ + + for (cnt = 0; cnt < (*elemp)->len; ++cnt) + if ((*elemp)->slotinfo[cnt].map != NULL) + /* Still used. */ + return false; + + /* We can remove the list element. */ + free (*elemp); + *elemp = NULL; + + return true; +} + + libc_freeres_fn (free_mem) { struct link_map *l; @@ -235,20 +263,63 @@ libc_freeres_fn (free_mem) free (old); } - /* Remove all additional names added to the objects. */ for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns) - for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next) - { - struct libname_list *lnp = l->l_libname->next; - - l->l_libname->next = NULL; - - while (lnp != NULL) - { - struct libname_list *old = lnp; - lnp = lnp->next; - if (! old->dont_free) - free (old); - } - } + { + /* Remove all additional names added to the objects. */ + for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next) + { + struct libname_list *lnp = l->l_libname->next; + + l->l_libname->next = NULL; + + while (lnp != NULL) + { + struct libname_list *old = lnp; + lnp = lnp->next; + if (! old->dont_free) + free (old); + } + } + + if (__builtin_expect (GL(dl_ns)[ns]._ns_global_scope_alloc, 0) != 0 + && (GL(dl_ns)[ns]._ns_main_searchlist->r_nlist + // XXX Check whether we need NS-specific initial_searchlist + == GLRO(dl_initial_searchlist).r_nlist)) + { + /* All object dynamically loaded by the program are unloaded. Free + the memory allocated for the global scope variable. */ + struct link_map **old = GL(dl_ns)[ns]._ns_main_searchlist->r_list; + + /* Put the old map in. */ + GL(dl_ns)[ns]._ns_main_searchlist->r_list + // XXX Check whether we need NS-specific initial_searchlist + = GLRO(dl_initial_searchlist).r_list; + /* Signal that the original map is used. */ + GL(dl_ns)[ns]._ns_global_scope_alloc = 0; + + /* Now free the old map. */ + free (old); + } + } + + if (USE___THREAD || GL(dl_tls_dtv_slotinfo_list) != NULL) + { + /* Free the memory allocated for the dtv slotinfo array. We can do + this only if all modules which used this memory are unloaded. */ +#ifdef SHARED + if (GL(dl_initial_dtv) == NULL) + /* There was no initial TLS setup, it was set up later when + it used the normal malloc. */ + free_slotinfo (&GL(dl_tls_dtv_slotinfo_list)); + else +#endif + /* The first element of the list does not have to be deallocated. + It was allocated in the dynamic linker (i.e., with a different + malloc), and in the static library it's in .bss space. */ + free_slotinfo (&GL(dl_tls_dtv_slotinfo_list)->next); + } + + void *scope_free_list = GL(dl_scope_free_list); + GL(dl_scope_free_list) = NULL; + free (scope_free_list); } -- cgit 1.4.1