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a585ba226b
__libc_system. (__libc_system): Call it, putting just the line == NULL test here. * include/libc-symbols.h (__hidden_proto): Add extern keywords so variables work right. * elf/dl-open.c (dl_open_worker): Use _ macro instead of gettext. * elf/dl-close.c (_dl_close): Likewise. * include/netinet/in.h: Use libc_hidden_proto for bindresvport, in6addr_any, in6addr_loopback. Remove decls for bindresvport_internal, in6addr_any_internal, in6addr_loopback_internal. * sunrpc/svc_udp.c (svcudp_bufcreate): Nix INTUSE for bindresvport. * sunrpc/svc_tcp.c (svctcp_create): Likewise. * sunrpc/clnt_udp.c (clntudp_bufcreate): Likewise. * sunrpc/bindrsvprt.c: Change INTDEF to libc_hidden_def. * inet/in6_addr.c: Change INTVARDEF to libc_hidden_def. * sysdeps/posix/getaddrinfo.c (gaih_inet): Nix INTUSE for in6addr_loopback. * inet/gethstbyad_r.c (PREPROCESS): Nix INTUSE for in6addr_any. * include/netinet/ether.h: Use libc_hidden_proto for ether_ntoa_r, ether_aton_r. * inet/ether_aton_r.c: Add libc_hidden_def. * inet/ether_ntoa_r.c: Likewise. * include/rpc/auth.h: Use libc_hidden_proto for getnetname, netname2user, host2netname. * sunrpc/netname.c: Add libc_hidden_def. * include/netdb.h: Use libc_hidden_proto for innetgr, rcmd_af, rexec_af, rresvport_af, ruserok_af. * inet/rcmd.c: Add libc_hidden_def. * inet/getnetgrent_r.c: Likewise.
444 lines
13 KiB
C
444 lines
13 KiB
C
/* Close a shared object opened by `_dl_open'.
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Copyright (C) 1996-2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <dlfcn.h>
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#include <libintl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <bits/libc-lock.h>
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#include <ldsodefs.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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/* Type of the constructor functions. */
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typedef void (*fini_t) (void);
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#ifdef USE_TLS
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/* Returns true we an non-empty was found. */
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static bool
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remove_slotinfo (size_t idx, struct dtv_slotinfo_list *listp, size_t disp)
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{
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if (idx - disp >= listp->len)
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{
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/* There must be a next entry. Otherwise would the index be wrong. */
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assert (listp->next != NULL);
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if (remove_slotinfo (idx, listp->next, disp + listp->len))
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return true;
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/* No non-empty entry. Search from the end of this elements
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slotinfo array. */
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idx = disp + listp->len;
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}
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else
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{
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struct link_map *old_map = listp->slotinfo[idx - disp].map;
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assert (old_map != NULL);
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/* Mark the entry as unused. */
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listp->slotinfo[idx - disp].gen = GL(dl_tls_generation) + 1;
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listp->slotinfo[idx - disp].map = NULL;
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/* If this is not the last currently used entry no need to look
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further. */
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if (old_map->l_tls_modid != GL(dl_tls_max_dtv_idx))
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return true;
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assert (old_map->l_tls_modid == GL(dl_tls_max_dtv_idx));
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}
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while (idx - disp > disp == 0 ? 1 + GL(dl_tls_static_nelem) : 0)
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{
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--idx;
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if (listp->slotinfo[idx - disp].map != NULL)
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{
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/* Found a new last used index. */
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GL(dl_tls_max_dtv_idx) = idx;
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return true;
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}
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}
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/* No non-entry in this list element. */
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return false;
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}
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#endif
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void
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internal_function
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_dl_close (void *_map)
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{
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struct reldep_list
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{
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struct link_map **rellist;
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unsigned int nrellist;
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struct reldep_list *next;
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} *reldeps = NULL;
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struct link_map **list;
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struct link_map *map = _map;
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unsigned int i;
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unsigned int *new_opencount;
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#ifdef USE_TLS
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bool any_tls = false;
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#endif
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/* First see whether we can remove the object at all. */
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if (__builtin_expect (map->l_flags_1 & DF_1_NODELETE, 0)
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&& map->l_init_called)
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/* Nope. Do nothing. */
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return;
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if (__builtin_expect (map->l_opencount, 1) == 0)
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_dl_signal_error (0, map->l_name, NULL, N_("shared object not open"));
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/* Acquire the lock. */
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__libc_lock_lock_recursive (GL(dl_load_lock));
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/* Decrement the reference count. */
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if (map->l_opencount > 1 || map->l_type != lt_loaded)
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{
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/* There are still references to this object. Do nothing more. */
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if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_FILES, 0))
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_dl_debug_printf ("\nclosing file=%s; opencount == %u\n",
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map->l_name, map->l_opencount);
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/* One decrement the object itself, not the dependencies. */
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--map->l_opencount;
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__libc_lock_unlock_recursive (GL(dl_load_lock));
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return;
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}
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list = map->l_initfini;
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/* Compute the new l_opencount values. */
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i = map->l_searchlist.r_nlist;
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if (__builtin_expect (i == 0, 0))
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/* This can happen if we handle relocation dependencies for an
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object which wasn't loaded directly. */
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for (i = 1; list[i] != NULL; ++i)
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;
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new_opencount = (unsigned int *) alloca (i * sizeof (unsigned int));
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for (i = 0; list[i] != NULL; ++i)
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{
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list[i]->l_idx = i;
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new_opencount[i] = list[i]->l_opencount;
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}
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--new_opencount[0];
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for (i = 1; list[i] != NULL; ++i)
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if ((! (list[i]->l_flags_1 & DF_1_NODELETE) || ! list[i]->l_init_called)
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/* Decrement counter. */
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&& --new_opencount[i] == 0
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/* Test whether this object was also loaded directly. */
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&& list[i]->l_searchlist.r_list != NULL)
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{
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/* In this case we have the decrement all the dependencies of
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this object. They are all in MAP's dependency list. */
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unsigned int j;
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struct link_map **dep_list = list[i]->l_searchlist.r_list;
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for (j = 1; j < list[i]->l_searchlist.r_nlist; ++j)
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if (! (dep_list[j]->l_flags_1 & DF_1_NODELETE)
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|| ! dep_list[j]->l_init_called)
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{
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assert (dep_list[j]->l_idx < map->l_searchlist.r_nlist);
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--new_opencount[dep_list[j]->l_idx];
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}
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}
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assert (new_opencount[0] == 0);
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/* Call all termination functions at once. */
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for (i = 0; list[i] != NULL; ++i)
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{
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struct link_map *imap = list[i];
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if (new_opencount[i] == 0 && imap->l_type == lt_loaded
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&& (imap->l_info[DT_FINI] || imap->l_info[DT_FINI_ARRAY])
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&& (! (imap->l_flags_1 & DF_1_NODELETE) || ! imap->l_init_called)
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/* Skip any half-cooked objects that were never initialized. */
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&& imap->l_init_called)
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{
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/* When debugging print a message first. */
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if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
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_dl_debug_printf ("\ncalling fini: %s\n\n", imap->l_name);
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/* Call its termination function. */
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if (imap->l_info[DT_FINI_ARRAY] != NULL)
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{
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ElfW(Addr) *array =
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(ElfW(Addr) *) (imap->l_addr
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+ imap->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
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unsigned int sz = (imap->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
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/ sizeof (ElfW(Addr)));
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unsigned int cnt;
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for (cnt = 0; cnt < sz; ++cnt)
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((fini_t) (imap->l_addr + array[cnt])) ();
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}
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/* Next try the old-style destructor. */
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if (imap->l_info[DT_FINI] != NULL)
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(*(void (*) (void)) DL_DT_FINI_ADDRESS
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(imap, (void *) imap->l_addr
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+ imap->l_info[DT_FINI]->d_un.d_ptr)) ();
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}
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else if (new_opencount[i] != 0 && imap->l_type == lt_loaded)
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{
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/* The object is still used. But the object we are unloading
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right now is responsible for loading it and therefore we
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have the search list of the current object in its scope.
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Remove it. */
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struct r_scope_elem **runp = imap->l_scope;
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while (*runp != NULL)
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if (*runp == &map->l_searchlist)
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{
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/* Copy all later elements. */
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while ((runp[0] = runp[1]) != NULL)
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++runp;
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break;
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}
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else
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++runp;
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}
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/* Store the new l_opencount value. */
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imap->l_opencount = new_opencount[i];
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/* Just a sanity check. */
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assert (imap->l_type == lt_loaded || imap->l_opencount > 0);
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}
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/* Notify the debugger we are about to remove some loaded objects. */
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_r_debug.r_state = RT_DELETE;
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_dl_debug_state ();
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/* Check each element of the search list to see if all references to
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it are gone. */
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for (i = 0; list[i] != NULL; ++i)
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{
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struct link_map *imap = list[i];
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if (imap->l_opencount == 0 && imap->l_type == lt_loaded)
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{
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struct libname_list *lnp;
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/* That was the last reference, and this was a dlopen-loaded
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object. We can unmap it. */
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if (__builtin_expect (imap->l_global, 0))
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{
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/* This object is in the global scope list. Remove it. */
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unsigned int cnt = GL(dl_main_searchlist)->r_nlist;
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do
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--cnt;
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while (GL(dl_main_searchlist)->r_list[cnt] != imap);
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/* The object was already correctly registered. */
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while (++cnt < GL(dl_main_searchlist)->r_nlist)
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GL(dl_main_searchlist)->r_list[cnt - 1]
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= GL(dl_main_searchlist)->r_list[cnt];
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--GL(dl_main_searchlist)->r_nlist;
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}
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#ifdef USE_TLS
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/* Remove the object from the dtv slotinfo array if it uses
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TLS. */
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if (__builtin_expect (imap->l_tls_blocksize > 0, 0))
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{
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any_tls = true;
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if (! remove_slotinfo (imap->l_tls_modid,
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GL(dl_tls_dtv_slotinfo_list), 0))
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/* All dynamically loaded modules with TLS are unloaded. */
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GL(dl_tls_max_dtv_idx) = GL(dl_tls_static_nelem);
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}
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#endif
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/* We can unmap all the maps at once. We determined the
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start address and length when we loaded the object and
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the `munmap' call does the rest. */
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DL_UNMAP (imap);
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/* Finally, unlink the data structure and free it. */
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#ifdef SHARED
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/* We will unlink the first object only if this is a statically
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linked program. */
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assert (imap->l_prev != NULL);
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imap->l_prev->l_next = imap->l_next;
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#else
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if (imap->l_prev != NULL)
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imap->l_prev->l_next = imap->l_next;
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else
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GL(dl_loaded) = imap->l_next;
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#endif
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--GL(dl_nloaded);
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if (imap->l_next)
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imap->l_next->l_prev = imap->l_prev;
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if (imap->l_versions != NULL)
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free (imap->l_versions);
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if (imap->l_origin != NULL && imap->l_origin != (char *) -1)
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free ((char *) imap->l_origin);
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/* If the object has relocation dependencies save this
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information for latter. */
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if (__builtin_expect (imap->l_reldeps != NULL, 0))
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{
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struct reldep_list *newrel;
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newrel = (struct reldep_list *) alloca (sizeof (*reldeps));
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newrel->rellist = imap->l_reldeps;
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newrel->nrellist = imap->l_reldepsact;
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newrel->next = reldeps;
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reldeps = newrel;
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}
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/* This name always is allocated. */
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free (imap->l_name);
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/* Remove the list with all the names of the shared object. */
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lnp = imap->l_libname;
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do
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{
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struct libname_list *this = lnp;
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lnp = lnp->next;
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if (!this->dont_free)
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free (this);
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}
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while (lnp != NULL);
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/* Remove the searchlists. */
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if (imap != map)
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free (imap->l_initfini);
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/* Remove the scope array if we allocated it. */
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if (imap->l_scope != imap->l_scope_mem)
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free (imap->l_scope);
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if (imap->l_phdr_allocated)
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free ((void *) imap->l_phdr);
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if (imap->l_rpath_dirs.dirs != (void *) -1)
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free (imap->l_rpath_dirs.dirs);
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if (imap->l_runpath_dirs.dirs != (void *) -1)
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free (imap->l_runpath_dirs.dirs);
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free (imap);
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}
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}
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#ifdef USE_TLS
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/* If we removed any object which uses TLS bumnp the generation
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counter. */
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if (any_tls)
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if (__builtin_expect (++GL(dl_tls_generation) == 0, 0))
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__libc_fatal (_("TLS generation counter wrapped! Please send report with the 'glibcbug' script."));
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#endif
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/* Notify the debugger those objects are finalized and gone. */
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_r_debug.r_state = RT_CONSISTENT;
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_dl_debug_state ();
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/* Now we can perhaps also remove the modules for which we had
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dependencies because of symbol lookup. */
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while (__builtin_expect (reldeps != NULL, 0))
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{
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while (reldeps->nrellist-- > 0)
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_dl_close (reldeps->rellist[reldeps->nrellist]);
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free (reldeps->rellist);
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reldeps = reldeps->next;
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}
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free (list);
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/* Release the lock. */
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__libc_lock_unlock_recursive (GL(dl_load_lock));
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}
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libc_hidden_def (_dl_close)
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#ifdef USE_TLS
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static bool
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free_slotinfo (struct dtv_slotinfo_list *elemp)
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{
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size_t cnt;
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if (elemp == NULL)
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/* Nothing here, all is removed (or there never was anything). */
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return true;
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if (!free_slotinfo (elemp->next))
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/* We cannot free the entry. */
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return false;
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/* The least we could do is remove next element (if there was any). */
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elemp->next = NULL;
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for (cnt = 0; cnt < elemp->len; ++cnt)
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if (elemp->slotinfo[cnt].map != NULL)
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/* Still used. */
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return false;
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/* We can remove the list element. */
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free (elemp);
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return true;
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}
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#endif
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static void
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free_mem (void)
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{
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if (__builtin_expect (GL(dl_global_scope_alloc), 0) != 0
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&& GL(dl_main_searchlist)->r_nlist == GL(dl_initial_searchlist).r_nlist)
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{
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/* All object dynamically loaded by the program are unloaded. Free
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the memory allocated for the global scope variable. */
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struct link_map **old = GL(dl_main_searchlist)->r_list;
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/* Put the old map in. */
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GL(dl_main_searchlist)->r_list = GL(dl_initial_searchlist).r_list;
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/* Signal that the original map is used. */
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GL(dl_global_scope_alloc) = 0;
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/* Now free the old map. */
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free (old);
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}
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#ifdef USE_TLS
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/* Free the memory allocated for the dtv slotinfo array. We can do
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this only if all modules which used this memory are unloaded.
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Also, the first element of the list does not have to be
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deallocated. It was allocated in the dynamic linker (i.e., with
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a different malloc). */
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if (free_slotinfo (GL(dl_tls_dtv_slotinfo_list)->next))
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GL(dl_tls_dtv_slotinfo_list)->next = NULL;
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#endif
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}
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text_set_element (__libc_subfreeres, free_mem);
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