/* Call the termination functions of loaded shared objects.
- Copyright (C) 1995,96,1998-2002,2004-2005,2009,2011
- Free Software Foundation, Inc.
+ Copyright (C) 1995-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
-#include <alloca.h>
#include <assert.h>
#include <string.h>
#include <ldsodefs.h>
void
-internal_function
-_dl_sort_fini (struct link_map **maps, size_t nmaps, char *used, Lmid_t ns)
-{
- /* A list of one element need not be sorted. */
- if (nmaps == 1)
- return;
-
- /* We can skip looking for the binary itself which is at the front
- of the search list for the main namespace. */
- unsigned int i = ns == LM_ID_BASE;
- char seen[nmaps];
- memset (seen, 0, nmaps * sizeof (seen[0]));
- while (1)
- {
- /* Keep track of which object we looked at this round. */
- seen[i] += seen[i] < 2;
- struct link_map *thisp = maps[i];
-
- /* Do not handle ld.so in secondary namespaces and object which
- are not removed. */
- if (thisp != thisp->l_real || thisp->l_idx == -1)
- goto skip;
-
- /* Find the last object in the list for which the current one is
- a dependency and move the current object behind the object
- with the dependency. */
- unsigned int k = nmaps - 1;
- while (k > i)
- {
- struct link_map **runp = maps[k]->l_initfini;
- if (runp != NULL)
- /* Look through the dependencies of the object. */
- while (*runp != NULL)
- if (__builtin_expect (*runp++ == thisp, 0))
- {
- move:
- /* Move the current object to the back past the last
- object with it as the dependency. */
- memmove (&maps[i], &maps[i + 1],
- (k - i) * sizeof (maps[0]));
- maps[k] = thisp;
-
- if (used != NULL)
- {
- char here_used = used[i];
- memmove (&used[i], &used[i + 1],
- (k - i) * sizeof (used[0]));
- used[k] = here_used;
- }
-
- if (seen[i + 1] > 1)
- {
- ++i;
- goto next_clear;
- }
-
- char this_seen = seen[i];
- memmove (&seen[i], &seen[i + 1], (k - i) * sizeof (seen[0]));
- seen[k] = this_seen;
-
- goto next;
- }
-
- if (__builtin_expect (maps[k]->l_reldeps != NULL, 0))
- {
- unsigned int m = maps[k]->l_reldeps->act;
- struct link_map **relmaps = &maps[k]->l_reldeps->list[0];
-
- /* Look through the relocation dependencies of the object. */
- while (m-- > 0)
- if (__builtin_expect (relmaps[m] == thisp, 0))
- goto move;
- }
-
- --k;
- }
-
- skip:
- if (++i == nmaps)
- break;
- next_clear:
- memset (&seen[i], 0, (nmaps - i) * sizeof (seen[0]));
-
- next:;
- }
-}
-
-
-void
-internal_function
_dl_fini (void)
{
/* Lots of fun ahead. We have to call the destructors for all still
using `dlopen' there are possibly several other modules with its
dependencies to be taken into account. Therefore we have to start
determining the order of the modules once again from the beginning. */
- struct link_map **maps = NULL;
- size_t maps_size = 0;
/* We run the destructors of the main namespaces last. As for the
other namespaces, we pick run the destructors in them in reverse
/* Protect against concurrent loads and unloads. */
__rtld_lock_lock_recursive (GL(dl_load_lock));
- unsigned int nmaps = 0;
unsigned int nloaded = GL(dl_ns)[ns]._ns_nloaded;
/* No need to do anything for empty namespaces or those used for
auditing DSOs. */
|| GL(dl_ns)[ns]._ns_loaded->l_auditing != do_audit
#endif
)
- goto out;
-
- /* XXX Could it be (in static binaries) that there is no object
- loaded? */
- assert (ns != LM_ID_BASE || nloaded > 0);
-
- /* Now we can allocate an array to hold all the pointers and copy
- the pointers in. */
- if (maps_size < nloaded * sizeof (struct link_map *))
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
+ else
{
- if (maps_size == 0)
+ /* Now we can allocate an array to hold all the pointers and
+ copy the pointers in. */
+ struct link_map *maps[nloaded];
+
+ unsigned int i;
+ struct link_map *l;
+ assert (nloaded != 0 || GL(dl_ns)[ns]._ns_loaded == NULL);
+ for (l = GL(dl_ns)[ns]._ns_loaded, i = 0; l != NULL; l = l->l_next)
+ /* Do not handle ld.so in secondary namespaces. */
+ if (l == l->l_real)
+ {
+ assert (i < nloaded);
+
+ maps[i] = l;
+ l->l_idx = i;
+ ++i;
+
+ /* Bump l_direct_opencount of all objects so that they
+ are not dlclose()ed from underneath us. */
+ ++l->l_direct_opencount;
+ }
+ assert (ns != LM_ID_BASE || i == nloaded);
+ assert (ns == LM_ID_BASE || i == nloaded || i == nloaded - 1);
+ unsigned int nmaps = i;
+
+ /* Now we have to do the sorting. We can skip looking for the
+ binary itself which is at the front of the search list for
+ the main namespace. */
+ _dl_sort_maps (maps + (ns == LM_ID_BASE), nmaps - (ns == LM_ID_BASE),
+ NULL, true);
+
+ /* We do not rely on the linked list of loaded object anymore
+ from this point on. We have our own list here (maps). The
+ various members of this list cannot vanish since the open
+ count is too high and will be decremented in this loop. So
+ we release the lock so that some code which might be called
+ from a destructor can directly or indirectly access the
+ lock. */
+ __rtld_lock_unlock_recursive (GL(dl_load_lock));
+
+ /* 'maps' now contains the objects in the right order. Now
+ call the destructors. We have to process this array from
+ the front. */
+ for (i = 0; i < nmaps; ++i)
{
- maps_size = nloaded * sizeof (struct link_map *);
- maps = (struct link_map **) alloca (maps_size);
- }
- else
- maps = (struct link_map **)
- extend_alloca (maps, maps_size,
- nloaded * sizeof (struct link_map *));
- }
-
- unsigned int i;
- struct link_map *l;
- assert (nloaded != 0 || GL(dl_ns)[ns]._ns_loaded == NULL);
- for (l = GL(dl_ns)[ns]._ns_loaded, i = 0; l != NULL; l = l->l_next)
- /* Do not handle ld.so in secondary namespaces. */
- if (l == l->l_real)
- {
- assert (i < nloaded);
-
- maps[i] = l;
- l->l_idx = i;
- ++i;
-
- /* Bump l_direct_opencount of all objects so that they are
- not dlclose()ed from underneath us. */
- ++l->l_direct_opencount;
- }
- assert (ns != LM_ID_BASE || i == nloaded);
- assert (ns == LM_ID_BASE || i == nloaded || i == nloaded - 1);
- nmaps = i;
-
- /* Now we have to do the sorting. */
- _dl_sort_fini (maps, nmaps, NULL, ns);
-
- /* We do not rely on the linked list of loaded object anymore from
- this point on. We have our own list here (maps). The various
- members of this list cannot vanish since the open count is too
- high and will be decremented in this loop. So we release the
- lock so that some code which might be called from a destructor
- can directly or indirectly access the lock. */
- out:
- __rtld_lock_unlock_recursive (GL(dl_load_lock));
+ struct link_map *l = maps[i];
- /* 'maps' now contains the objects in the right order. Now call the
- destructors. We have to process this array from the front. */
- for (i = 0; i < nmaps; ++i)
- {
- l = maps[i];
-
- if (l->l_init_called)
- {
- /* Make sure nothing happens if we are called twice. */
- l->l_init_called = 0;
-
- /* Is there a destructor function? */
- if (l->l_info[DT_FINI_ARRAY] != NULL
- || l->l_info[DT_FINI] != NULL)
+ if (l->l_init_called)
{
- /* When debugging print a message first. */
- if (__builtin_expect (GLRO(dl_debug_mask)
- & DL_DEBUG_IMPCALLS, 0))
- _dl_debug_printf ("\ncalling fini: %s [%lu]\n\n",
- l->l_name[0] ? l->l_name : rtld_progname,
- ns);
+ /* Make sure nothing happens if we are called twice. */
+ l->l_init_called = 0;
- /* First see whether an array is given. */
- if (l->l_info[DT_FINI_ARRAY] != NULL)
+ /* Is there a destructor function? */
+ if (l->l_info[DT_FINI_ARRAY] != NULL
+ || l->l_info[DT_FINI] != NULL)
{
- ElfW(Addr) *array =
- (ElfW(Addr) *) (l->l_addr
- + l->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
- unsigned int i = (l->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
- / sizeof (ElfW(Addr)));
- while (i-- > 0)
- ((fini_t) array[i]) ();
+ /* When debugging print a message first. */
+ if (__builtin_expect (GLRO(dl_debug_mask)
+ & DL_DEBUG_IMPCALLS, 0))
+ _dl_debug_printf ("\ncalling fini: %s [%lu]\n\n",
+ DSO_FILENAME (l->l_name),
+ ns);
+
+ /* First see whether an array is given. */
+ if (l->l_info[DT_FINI_ARRAY] != NULL)
+ {
+ ElfW(Addr) *array =
+ (ElfW(Addr) *) (l->l_addr
+ + l->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
+ unsigned int i = (l->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
+ / sizeof (ElfW(Addr)));
+ while (i-- > 0)
+ ((fini_t) array[i]) ();
+ }
+
+ /* Next try the old-style destructor. */
+ if (l->l_info[DT_FINI] != NULL)
+ DL_CALL_DT_FINI
+ (l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr);
}
- /* Next try the old-style destructor. */
- if (l->l_info[DT_FINI] != NULL)
- ((fini_t) DL_DT_FINI_ADDRESS (l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr)) ();
- }
-
#ifdef SHARED
- /* Auditing checkpoint: another object closed. */
- if (!do_audit && __builtin_expect (GLRO(dl_naudit) > 0, 0))
- {
- struct audit_ifaces *afct = GLRO(dl_audit);
- for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ /* Auditing checkpoint: another object closed. */
+ if (!do_audit && __builtin_expect (GLRO(dl_naudit) > 0, 0))
{
- if (afct->objclose != NULL)
- /* Return value is ignored. */
- (void) afct->objclose (&l->l_audit[cnt].cookie);
-
- afct = afct->next;
+ struct audit_ifaces *afct = GLRO(dl_audit);
+ for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+ {
+ if (afct->objclose != NULL)
+ /* Return value is ignored. */
+ (void) afct->objclose (&l->l_audit[cnt].cookie);
+
+ afct = afct->next;
+ }
}
- }
#endif
- }
+ }
- /* Correct the previous increment. */
- --l->l_direct_opencount;
+ /* Correct the previous increment. */
+ --l->l_direct_opencount;
+ }
}
}
goto again;
}
- if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS, 0))
+ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_STATISTICS))
_dl_debug_printf ("\nruntime linker statistics:\n"
" final number of relocations: %lu\n"
"final number of relocations from cache: %lu\n",
projects / thirdparty / glibc.git / blobdiff