421f82e5cc
* Makeconfig (+gccwarn): Add -Winline. * hurd/hurdsig.c (_hurd_internal_post_signal): If SS->context is set, avoid abort_rpcs, and use reply and intr ports saved in SS->context. * sysdeps/mach/hurd/i386/trampoline.c: Don't set SS->intr_port from SS->context. Don't clear SS->context. * sysdeps/mach/hurd/i386/sigreturn.c: Don't set SS->intr_port when setting SS->context. If msg_sig_post returns, re-lock and clear SS->context. Fri May 5 10:37:09 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> * mach/Makefile (errsystems.c): Comment out generation rule. * sysdeps/mach/_strerror.c: Consider a system unknown if its bad_sub member is null. * mach/mig-alloc.c: Add weak alias to non-__ name.
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* dlclose -- Close a handle opened by `dlopen'.
|
|
Copyright (C) 1995 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
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <link.h>
|
|
#include <dlfcn.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
|
|
|
|
#define LOSE(s) _dl_signal_error (0, map->l_name, s)
|
|
|
|
int
|
|
dlclose (void *handle)
|
|
{
|
|
void doit (void)
|
|
{
|
|
struct link_map *map = handle;
|
|
|
|
if (map->l_opencount == 0)
|
|
LOSE ("shared object not open");
|
|
|
|
/* Decrement the reference count. */
|
|
--map->l_opencount;
|
|
|
|
if (map->l_opencount == 0 && map->l_type == lt_loaded)
|
|
{
|
|
/* That was the last reference, and this was a dlopen-loaded
|
|
object. We can unmap it. */
|
|
const Elf32_Phdr *ph;
|
|
|
|
if (map->l_info[DT_FINI])
|
|
/* Call its termination function. */
|
|
(*(void (*) (void)) ((void *) map->l_addr +
|
|
map->l_info[DT_FINI]->d_un.d_ptr)) ();
|
|
|
|
if (map->l_info[DT_NEEDED])
|
|
{
|
|
/* Also close all the dependencies. */
|
|
const char *strtab
|
|
= (void *) map->l_addr + map->l_info[DT_STRTAB]->d_un.d_ptr;
|
|
const Elf32_Dyn *d;
|
|
for (d = map->l_ld; d->d_tag != DT_NULL; ++d)
|
|
if (d->d_tag == DT_NEEDED)
|
|
{
|
|
/* It must already be open, since this one needed it;
|
|
so dlopen will just find us its `struct link_map'
|
|
and bump its reference count. */
|
|
struct link_map *o, *dep
|
|
= dlopen (strtab + d->d_un.d_val, RTLD_LAZY);
|
|
--dep->l_opencount; /* Lose the ref from that dlopen. */
|
|
/* Now we have the handle; we can close it for real. */
|
|
o = map;
|
|
map = dep;
|
|
doit ();
|
|
map = o;
|
|
}
|
|
}
|
|
|
|
/* Unmap the segments. */
|
|
for (ph = map->l_phdr; ph < &map->l_phdr[map->l_phnum]; ++ph)
|
|
if (ph->p_type == PT_LOAD)
|
|
{
|
|
Elf32_Addr mapstart = ph->p_vaddr & ~(ph->p_align - 1);
|
|
Elf32_Addr mapend = ((ph->p_vaddr + ph->p_memsz
|
|
+ ph->p_align - 1)
|
|
& ~(ph->p_align - 1));
|
|
munmap ((caddr_t) mapstart, mapend - mapstart);
|
|
}
|
|
|
|
/* Finally, unlink the data structure and free it. */
|
|
map->l_prev->l_next = map->l_next;
|
|
if (map->l_next)
|
|
map->l_next->l_prev = map->l_prev;
|
|
free (map);
|
|
}
|
|
}
|
|
|
|
return _dlerror_run (doit) ? -1 : 0;
|
|
}
|
|
|