From: Lennart Poettering Date: Mon, 17 Sep 2007 12:31:06 +0000 (+0000) Subject: Add a special ltdl .so loader that avoids lazy frelocations during runtime X-Git-Tag: submit/2.0-panda/20130828.192557~2837^2~1^2~132 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=061e8068aab4237b31abc1d8763999db1bcbc57f;p=profile%2Fivi%2Fpulseaudio-panda.git Add a special ltdl .so loader that avoids lazy frelocations during runtime git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1838 fefdeb5f-60dc-0310-8127-8f9354f1896f --- diff --git a/configure.ac b/configure.ac index c12cfc0..869db01 100644 --- a/configure.ac +++ b/configure.ac @@ -187,7 +187,7 @@ AC_HEADER_STDC AC_CHECK_HEADERS([arpa/inet.h glob.h grp.h netdb.h netinet/in.h \ netinet/in_systm.h netinet/tcp.h pwd.h sched.h \ sys/mman.h sys/resource.h sys/select.h sys/socket.h sys/wait.h \ - syslog.h]) + syslog.h sys/dl.h dlfcn.h]) AC_CHECK_HEADERS([netinet/ip.h], [], [], [#include #if HAVE_NETINET_IN_H diff --git a/src/Makefile.am b/src/Makefile.am index 9914c19..d9933a0 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -132,6 +132,7 @@ pulseaudio_SOURCES = \ daemon/cpulimit.c daemon/cpulimit.h \ daemon/daemon-conf.c daemon/daemon-conf.h \ daemon/dumpmodules.c daemon/dumpmodules.h \ + daemon/ltdl-bind-now.c daemon/ltdl-bind-now.h \ daemon/main.c \ pulsecore/gccmacro.h diff --git a/src/daemon/ltdl-bind-now.c b/src/daemon/ltdl-bind-now.c new file mode 100644 index 0000000..f5347db --- /dev/null +++ b/src/daemon/ltdl-bind-now.c @@ -0,0 +1,160 @@ +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 Lennart Poettering + Copyright 2006 Pierre Ossman for Cendio AB + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2 of the License, + or (at your option) any later version. + + PulseAudio 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 + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#if HAVE_DLFCN_H +#include +#endif + +#if HAVE_SYS_DL_H +#include +#endif + +#include + +#include +#include +#include +#include + +#include "ltdl-bind-now.h" + +#ifdef RTLD_NOW +#define PA_BIND_NOW RTLD_NOW +#elif defined(DL_NOW) +#define PA_BIND_NOW DL_NOW +#else +#undef PA_BIND_NOW +#endif + +static pa_mutex *libtool_mutex = NULL; + +PA_STATIC_TLS_DECLARE_NO_FREE(libtool_tls); + +static void libtool_lock(void) { + pa_mutex_lock(libtool_mutex); +} + +static void libtool_unlock(void) { + pa_mutex_unlock(libtool_mutex); +} + +static void libtool_set_error(const char *error) { + PA_STATIC_TLS_SET(libtool_tls, (char*) error); +} + +static const char *libtool_get_error(void) { + return PA_STATIC_TLS_GET(libtool_tls); +} + +#ifdef PA_BIND_NOW + +/* + To avoid lazy relocations during runtime in our RT threads we add + our own shared object loader with uses RTLD_NOW if it is + available. The standard ltdl loader prefers RTLD_LAZY. + + Please note that this loader doesn't have any influence on + relocations on any libraries that are already loaded into our + process, i.e. because the pulseaudio binary links directly to + them. To disable lazy relocations for those libraries it is possible + to set $LT_BIND_NOW before starting the pulsaudio binary. +*/ + +static lt_module bind_now_open(lt_user_data d, const char *fname) { + lt_module m; + + pa_assert(fname); + + if (!(m = dlopen(fname, PA_BIND_NOW))) { + libtool_set_error(dlerror()); + return NULL; + } + + return m; +} + +static int bind_now_close(lt_user_data d, lt_module m) { + + pa_assert(m); + + if (dlclose(m) != 0){ + libtool_set_error(dlerror()); + return 1; + } + + return 0; +} + +static lt_ptr bind_now_find_sym(lt_user_data d, lt_module m, const char *symbol) { + lt_ptr ptr; + + pa_assert(m); + pa_assert(symbol); + + if (!(ptr = dlsym(m, symbol))) { + libtool_set_error(dlerror()); + return NULL; + } + + return ptr; +} + +#endif + +void pa_ltdl_init(void) { + +#ifdef PA_BIND_NOW + lt_dlloader *place; + static const struct lt_user_dlloader loader = { + .module_open = bind_now_open, + .module_close = bind_now_close, + .find_sym = bind_now_find_sym + }; +#endif + + pa_assert_se(lt_dlinit() == 0); + pa_assert_se(libtool_mutex = pa_mutex_new(TRUE, FALSE)); + pa_assert_se(lt_dlmutex_register(libtool_lock, libtool_unlock, libtool_set_error, libtool_get_error) == 0); + +#ifdef PA_BIND_NOW + + if (!(place = lt_dlloader_find("dlopen"))) + place = lt_dlloader_next(NULL); + + /* Add our BIND_NOW loader as the default module loader. */ + if (lt_dlloader_add(place, &loader, "bind-now-loader") != 0) + pa_log_warn("Failed to add bind-now-loader."); +#endif +} + +void pa_ltdl_done(void) { + pa_assert_se(lt_dlexit() == 0); + pa_mutex_free(libtool_mutex); + libtool_mutex = NULL; +} + diff --git a/src/daemon/ltdl-bind-now.h b/src/daemon/ltdl-bind-now.h new file mode 100644 index 0000000..e19c7bc --- /dev/null +++ b/src/daemon/ltdl-bind-now.h @@ -0,0 +1,32 @@ +#ifndef foopulsecoreltdlbindnowhfoo +#define foopulsecoreltdlbindnowhfoo + +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 Lennart Poettering + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2 of the License, + or (at your option) any later version. + + PulseAudio 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 + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + + +void pa_ltdl_init(void); +void pa_ltdl_done(void); + +#endif + diff --git a/src/daemon/main.c b/src/daemon/main.c index f34e59e..6c7928e 100644 --- a/src/daemon/main.c +++ b/src/daemon/main.c @@ -93,6 +93,7 @@ #include "daemon-conf.h" #include "dumpmodules.h" #include "caps.h" +#include "ltdl-bind-now.h" #ifdef HAVE_LIBWRAP /* Only one instance of these variables */ @@ -309,38 +310,6 @@ static void set_all_rlimits(const pa_daemon_conf *conf) { } #endif -static pa_mutex *libtool_mutex = NULL; - -static void libtool_lock(void) { - pa_mutex_lock(libtool_mutex); -} - -static void libtool_unlock(void) { - pa_mutex_unlock(libtool_mutex); -} - -PA_STATIC_TLS_DECLARE_NO_FREE(libtool_tls); - -static void libtool_set_error(const char * error) { - PA_STATIC_TLS_SET(libtool_tls, (char*) error); -} - -static const char *libtool_get_error(void) { - return PA_STATIC_TLS_GET(libtool_tls); -} - -static void libtool_init(void) { - pa_assert_se(libtool_mutex = pa_mutex_new(TRUE, FALSE)); - pa_assert_se(lt_dlmutex_register(libtool_lock, libtool_unlock, libtool_set_error, libtool_get_error) == 0); - pa_assert_se(lt_dlinit() == 0); -} - -static void libtool_done(void) { - pa_assert_se(lt_dlexit() == 0); - pa_mutex_free(libtool_mutex); - libtool_mutex = NULL; -} - int main(int argc, char *argv[]) { pa_core *c = NULL; pa_strbuf *buf = NULL; @@ -396,7 +365,7 @@ int main(int argc, char *argv[]) { LTDL_SET_PRELOADED_SYMBOLS(); - libtool_init(); + pa_ltdl_init(); #ifdef OS_IS_WIN32 { @@ -747,7 +716,7 @@ finish: WSACleanup(); #endif - libtool_done(); + pa_ltdl_done(); #ifdef HAVE_DBUS dbus_shutdown();