2 This file is part of PulseAudio.
4 Copyright 2004-2008 Lennart Poettering
5 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
7 PulseAudio is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published
9 by the Free Software Foundation; either version 2.1 of the License,
10 or (at your option) any later version.
12 PulseAudio is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with PulseAudio; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
39 #include <pulse/i18n.h>
41 #include <pulsecore/macro.h>
42 #include <pulsecore/log.h>
44 #include "ltdl-bind-now.h"
47 #define PA_BIND_NOW RTLD_NOW
49 #define PA_BIND_NOW DL_NOW
57 To avoid lazy relocations during runtime in our RT threads we add
58 our own shared object loader with uses RTLD_NOW if it is
59 available. The standard ltdl loader prefers RTLD_LAZY.
61 Please note that this loader doesn't have any influence on
62 relocations on any libraries that are already loaded into our
63 process, i.e. because the pulseaudio binary links directly to
64 them. To disable lazy relocations for those libraries it is possible
65 to set $LT_BIND_NOW before starting the pulsaudio binary.
68 static lt_module
bind_now_open(lt_user_data d
, const char *fname
, lt_dladvise advise
) {
73 if (!(m
= dlopen(fname
, PA_BIND_NOW
))) {
74 lt_dlseterror(LT_ERROR_CANNOT_OPEN
);
81 static int bind_now_close(lt_user_data d
, lt_module m
) {
86 lt_dlseterror(LT_ERROR_CANNOT_CLOSE
);
93 static lt_ptr
bind_now_find_sym(lt_user_data d
, lt_module m
, const char *symbol
) {
99 if (!(ptr
= dlsym(m
, symbol
))) {
100 lt_dlseterror(LT_ERROR_SYMBOL_NOT_FOUND
);
107 static lt_dlvtable
*bindnow_loader
= NULL
;
110 void pa_ltdl_init(void) {
113 const lt_dlvtable
*dlopen_loader
;
116 pa_assert_se(lt_dlinit() == 0);
119 /* Already initialised */
123 if (!(dlopen_loader
= lt_dlloader_find((char*) "lt_dlopen"))) {
124 pa_log_warn(_("Failed to find original lt_dlopen loader."));
128 if (!(bindnow_loader
= malloc(sizeof(lt_dlvtable
)))) {
129 pa_log_error(_("Failed to allocate new dl loader."));
133 memcpy(bindnow_loader
, dlopen_loader
, sizeof(*bindnow_loader
));
134 bindnow_loader
->name
= "bind-now-loader";
135 bindnow_loader
->module_open
= bind_now_open
;
136 bindnow_loader
->module_close
= bind_now_close
;
137 bindnow_loader
->find_sym
= bind_now_find_sym
;
138 bindnow_loader
->priority
= LT_DLLOADER_PREPEND
;
140 /* Add our BIND_NOW loader as the default module loader. */
141 if (lt_dlloader_add(bindnow_loader
) != 0) {
142 pa_log_warn(_("Failed to add bind-now-loader."));
143 free(bindnow_loader
);
144 bindnow_loader
= NULL
;
149 void pa_ltdl_done(void) {
150 pa_assert_se(lt_dlexit() == 0);
153 /* lt_dlexit() will free our loader vtable, hence reset our
154 * pointer to it here */
155 bindnow_loader
= NULL
;