mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-07 13:30:03 -05:00
5effc83479
FSF addresses used in PA sources are no longer valid and rpmlint generates numerous warnings during packaging because of this. This patch changes all FSF addresses to FSF web page according to the GPL how-to: https://www.gnu.org/licenses/gpl-howto.en.html Done automatically by sed-ing through sources.
159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2004-2008 Lennart Poettering
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Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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#ifdef HAVE_SYS_DL_H
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#include <sys/dl.h>
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#endif
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#include <string.h>
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#include <ltdl.h>
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#include <pulsecore/i18n.h>
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#include <pulsecore/macro.h>
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#include <pulsecore/log.h>
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#include "ltdl-bind-now.h"
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#ifdef RTLD_NOW
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#define PA_BIND_NOW RTLD_NOW
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#elif defined(DL_NOW)
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#define PA_BIND_NOW DL_NOW
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#else
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#undef PA_BIND_NOW
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#endif
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#ifdef OS_IS_WIN32
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#undef PA_BIND_NOW
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#endif
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#ifdef PA_BIND_NOW
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/*
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To avoid lazy relocations during runtime in our RT threads we add
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our own shared object loader with uses RTLD_NOW if it is
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available. The standard ltdl loader prefers RTLD_LAZY.
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Please note that this loader doesn't have any influence on
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relocations on any libraries that are already loaded into our
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process, i.e. because the pulseaudio binary links directly to
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them. To disable lazy relocations for those libraries it is possible
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to set $LT_BIND_NOW before starting the pulseaudio binary.
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*/
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static lt_module bind_now_open(lt_user_data d, const char *fname, lt_dladvise advise) {
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lt_module m;
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pa_assert(fname);
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if (!(m = dlopen(fname, PA_BIND_NOW))) {
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pa_log(_("Failed to open module %s: %s"), fname, dlerror());
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lt_dlseterror(LT_ERROR_CANNOT_OPEN);
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return NULL;
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}
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return m;
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}
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static int bind_now_close(lt_user_data d, lt_module m) {
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pa_assert(m);
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if (dlclose(m) != 0) {
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lt_dlseterror(LT_ERROR_CANNOT_CLOSE);
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return 1;
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}
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return 0;
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}
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static lt_ptr bind_now_find_sym(lt_user_data d, lt_module m, const char *symbol) {
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lt_ptr ptr;
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pa_assert(m);
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pa_assert(symbol);
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if (!(ptr = dlsym(m, symbol))) {
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lt_dlseterror(LT_ERROR_SYMBOL_NOT_FOUND);
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return NULL;
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}
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return ptr;
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}
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static lt_dlvtable *bindnow_loader = NULL;
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#endif
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void pa_ltdl_init(void) {
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#ifdef PA_BIND_NOW
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const lt_dlvtable *dlopen_loader;
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#endif
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pa_assert_se(lt_dlinit() == 0);
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#ifdef PA_BIND_NOW
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/* Already initialised */
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if (bindnow_loader)
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return;
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if (!(dlopen_loader = lt_dlloader_find((char*) "lt_dlopen"))) {
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pa_log_warn(_("Failed to find original lt_dlopen loader."));
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return;
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}
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if (!(bindnow_loader = malloc(sizeof(lt_dlvtable)))) {
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pa_log_error(_("Failed to allocate new dl loader."));
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return;
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}
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memcpy(bindnow_loader, dlopen_loader, sizeof(*bindnow_loader));
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bindnow_loader->name = "bind-now-loader";
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bindnow_loader->module_open = bind_now_open;
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bindnow_loader->module_close = bind_now_close;
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bindnow_loader->find_sym = bind_now_find_sym;
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bindnow_loader->priority = LT_DLLOADER_PREPEND;
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/* Add our BIND_NOW loader as the default module loader. */
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if (lt_dlloader_add(bindnow_loader) != 0) {
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pa_log_warn(_("Failed to add bind-now-loader."));
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free(bindnow_loader);
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bindnow_loader = NULL;
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}
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#endif
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}
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void pa_ltdl_done(void) {
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pa_assert_se(lt_dlexit() == 0);
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#ifdef PA_BIND_NOW
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/* lt_dlexit() will free our loader vtable, hence reset our
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* pointer to it here */
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bindnow_loader = NULL;
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#endif
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}
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