Blame src/dlmisc.c

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/**
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 * \file dlmisc.c
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 * \brief dynamic loader helpers
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 * \author Jaroslav Kysela <perex@perex.cz>
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 * \date 2001
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 *
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 * Dynamic loader helpers
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 */
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/*
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 *  Dynamic loader helpers
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 *  Copyright (c) 2000 by Jaroslav Kysela <perex@perex.cz>
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 *
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 *
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 *   This library 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
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 *   published by the Free Software Foundation; either version 2.1 of
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 *   the License, or (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU Lesser General Public License for more details.
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 *
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 *   You should have received a copy of the GNU Lesser General Public
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 *   License along with this library; if not, write to the Free Software
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 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 */
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#include "list.h"
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#include "local.h"
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#ifdef HAVE_LIBPTHREAD
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#include <pthread.h>
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#endif
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#include <limits.h>
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#if defined(HAVE_LIBDL) && defined(__GLIBC__) && !defined(__UCLIBC__)
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#define DL_ORIGIN_AVAILABLE 1
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#endif
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#ifndef DOC_HIDDEN
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#ifndef PIC
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struct snd_dlsym_link *snd_dlsym_start = NULL;
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#endif
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static int snd_plugin_dir_set = 0;
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static char *snd_plugin_dir = NULL;
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#endif
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#ifdef HAVE_LIBPTHREAD
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static pthread_mutex_t snd_dlpath_mutex = PTHREAD_MUTEX_INITIALIZER;
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static inline void snd_dlpath_lock(void)
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{
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	pthread_mutex_lock(&snd_dlpath_mutex);
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}
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static inline void snd_dlpath_unlock(void)
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{
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	pthread_mutex_unlock(&snd_dlpath_mutex);
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}
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#else
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static inline void snd_dlpath_lock(void) {}
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static inline void snd_dlpath_unlock(void) {}
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#endif
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static void snd_dlinfo_origin(char *path, size_t path_len)
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{
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#ifdef DL_ORIGIN_AVAILABLE
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	struct link_map *links;
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	Dl_info info;
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	char origin[PATH_MAX];
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	if (dladdr1(&snd_dlpath, &info, (void**)&links, RTLD_DL_LINKMAP) == 0)
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		return;
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	if (dlinfo(links, RTLD_DI_ORIGIN, origin))
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		return;
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	snprintf(path, path_len, "%s/alsa-lib", origin);
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	if (access(path, X_OK) == 0)
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		snd_plugin_dir = strdup(path);
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#endif
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}
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/**
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 *
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 * \brief Compose the dynamic path
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 * \param path Returned path (string)
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 * \param path_len Returned path max size (with trailing zero)
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 * \param name Plugin name (relative)
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 * \return Zero on success, otherwise a negative error code
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 */
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int snd_dlpath(char *path, size_t path_len, const char *name)
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{
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	snd_dlpath_lock();
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	if (!snd_plugin_dir_set) {
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		const char *env = getenv("ALSA_PLUGIN_DIR");
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		if (env) {
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			snd_plugin_dir = strdup(env);
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		} else {
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			snd_dlinfo_origin(path, path_len);
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		}
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		snd_plugin_dir_set = 1;
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	}
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	snprintf(path, path_len, "%s/%s",
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		 snd_plugin_dir ? snd_plugin_dir : ALSA_PLUGIN_DIR, name);
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	snd_dlpath_unlock();
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	return 0;
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}
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/**
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 * \brief Opens a dynamic library - ALSA wrapper for \c dlopen.
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 * \param name name of the library, similar to \c dlopen.
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 * \param mode mode flags, similar to \c dlopen.
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 * \param errbuf a string buffer for the error message \c dlerror.
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 * \param errbuflen a length of the string buffer for the error message.
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 * \return Library handle if successful, otherwise \c NULL.
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 *
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 * This function can emulate dynamic linking for the static build of
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 * the alsa-lib library. In that case, \p name is set to \c NULL.
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 */
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#ifndef DOXYGEN
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EXPORT_SYMBOL void *INTERNAL(snd_dlopen)(const char *name, int mode, char *errbuf, size_t errbuflen)
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#else
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void *snd_dlopen(const char *name, int mode, char *errbuf, size_t errbuflen)
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#endif
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{
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#ifndef PIC
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	if (name == NULL)
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		return &snd_dlsym_start;
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#else
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#ifdef HAVE_LIBDL
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	if (name == NULL) {
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		static const char * self = NULL;
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		if (self == NULL) {
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			Dl_info dlinfo;
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			if (dladdr(snd_dlopen, &dlinfo) > 0)
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				self = dlinfo.dli_fname;
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		}
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		name = self;
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	}
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#endif
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#endif
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#ifdef HAVE_LIBDL
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	/*
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	 * Handle the plugin dir not being on the default dlopen search
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	 * path, without resorting to polluting the entire system namespace
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	 * via ld.so.conf.
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	 */
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	void *handle = NULL;
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	const char *filename = name;
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	char path[PATH_MAX];
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	if (name && name[0] != '/') {
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		if (snd_dlpath(path, sizeof(path), name) == 0)
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			filename = path;
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	}
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	handle = dlopen(filename, mode);
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	if (!handle)
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		goto errpath;
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	return handle;
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errpath:
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	if (errbuf)
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		snprintf(errbuf, errbuflen, "%s", dlerror());
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#endif
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	return NULL;
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}
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#ifndef DOXYGEN
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EXPORT_SYMBOL void *INTERNAL(snd_dlopen_old)(const char *name, int mode)
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{
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  return INTERNAL(snd_dlopen)(name, mode, NULL, 0);
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}
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#endif
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use_symbol_version(__snd_dlopen_old, snd_dlopen, ALSA_0.9);
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use_default_symbol_version(__snd_dlopen, snd_dlopen, ALSA_1.1.6);
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/**
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 * \brief Closes a dynamic library - ALSA wrapper for \c dlclose.
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 * \param handle Library handle, similar to \c dlclose.
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 * \return Zero if successful, otherwise an error code.
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 *
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 * This function can emulate dynamic linking for the static build of
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 * the alsa-lib library.
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 */
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int snd_dlclose(void *handle)
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{
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#ifndef PIC
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	if (handle == &snd_dlsym_start)
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		return 0;
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#endif
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#ifdef HAVE_LIBDL
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	return dlclose(handle);
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#else
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	return 0;
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#endif
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}
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/**
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 * \brief Verifies a dynamically loaded symbol.
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 * \param handle Library handle, similar to \c dlsym.
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 * \param name Symbol name.
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 * \param version Version of the symbol.
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 * \return Zero is successful, otherwise a negative error code.
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 *
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 * This function checks that the symbol with the version appended to its name
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 * does exist in the library.
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 */
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static int snd_dlsym_verify(void *handle, const char *name, const char *version)
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{
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#ifdef HAVE_LIBDL
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	int res;
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	char *vname;
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	if (handle == NULL)
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		return -EINVAL;
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	vname = alloca(1 + strlen(name) + strlen(version) + 1);
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	if (vname == NULL)
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		return -ENOMEM;
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	vname[0] = '_';
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	strcpy(vname + 1, name);
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	strcat(vname, version);
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	res = dlsym(handle, vname) == NULL ? -ENOENT : 0;
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	// printf("dlsym verify: %i, vname = '%s'\n", res, vname);
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	if (res < 0)
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		SNDERR("unable to verify version for symbol %s", name);
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	return res;
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#else
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	return 0;
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#endif
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}
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/**
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 * \brief Resolves a symbol from a dynamic library - ALSA wrapper for \c dlsym.
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 * \param handle Library handle, similar to \c dlsym.
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 * \param name Symbol name.
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 * \param version Version of the symbol.
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 *
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 * This function can emulate dynamic linking for the static build of
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 * the alsa-lib library.
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 *
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 * This special version of the \c dlsym function checks also the version
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 * of the symbol. A versioned symbol should be defined using the
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 * #SND_DLSYM_BUILD_VERSION macro.
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 */
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void *snd_dlsym(void *handle, const char *name, const char *version)
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{
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	int err;
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#ifndef PIC
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	if (handle == &snd_dlsym_start) {
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		/* it's the funny part: */
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		/* we are looking for a symbol in a static library */
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		struct snd_dlsym_link *link = snd_dlsym_start;
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		while (link) {
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			if (!strcmp(name, link->dlsym_name))
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				return (void *)link->dlsym_ptr;
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			link = link->next;
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		}
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		return NULL;
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	}
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#endif
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#ifdef HAVE_LIBDL
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#ifdef VERSIONED_SYMBOLS
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	if (version) {
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		err = snd_dlsym_verify(handle, name, version);
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		if (err < 0)
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			return NULL;
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	}
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#endif
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	return dlsym(handle, name);
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#else
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	return NULL;
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#endif
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}
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/*
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 * dlobj cache
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 */
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#ifndef DOC_HIDDEN
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struct dlobj_cache {
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	const char *lib;
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	const char *name;
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	void *dlobj;
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	void *func;
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	unsigned int refcnt;
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	struct list_head list;
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};
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#ifdef HAVE_LIBPTHREAD
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static pthread_mutex_t snd_dlobj_mutex = PTHREAD_MUTEX_INITIALIZER;
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static inline void snd_dlobj_lock(void)
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{
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	pthread_mutex_lock(&snd_dlobj_mutex);
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}
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static inline void snd_dlobj_unlock(void)
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{
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	pthread_mutex_unlock(&snd_dlobj_mutex);
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}
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#else
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static inline void snd_dlobj_lock(void) {}
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static inline void snd_dlobj_unlock(void) {}
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#endif
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static LIST_HEAD(pcm_dlobj_list);
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static struct dlobj_cache *
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snd_dlobj_cache_get0(const char *lib, const char *name,
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		     const char *version, int verbose)
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{
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	struct list_head *p;
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	struct dlobj_cache *c;
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	void *func, *dlobj;
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	char errbuf[256];
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	list_for_each(p, &pcm_dlobj_list) {
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		c = list_entry(p, struct dlobj_cache, list);
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		if (c->lib && lib && strcmp(c->lib, lib) != 0)
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			continue;
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		if (!c->lib && lib)
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			continue;
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		if (!lib && c->lib)
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			continue;
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		if (strcmp(c->name, name) == 0) {
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			c->refcnt++;
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			return c;
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		}
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	}
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	errbuf[0] = '\0';
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	dlobj = INTERNAL(snd_dlopen)(lib, RTLD_NOW,
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	                   verbose ? errbuf : 0,
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	                   verbose ? sizeof(errbuf) : 0);
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	if (dlobj == NULL) {
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		if (verbose)
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			SNDERR("Cannot open shared library %s (%s)",
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						lib ? lib : "[builtin]",
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						errbuf);
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		return NULL;
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	}
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	func = snd_dlsym(dlobj, name, version);
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	if (func == NULL) {
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		if (verbose)
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			SNDERR("symbol %s is not defined inside %s",
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					name, lib ? lib : "[builtin]");
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		goto __err;
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	}
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	c = malloc(sizeof(*c));
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	if (! c)
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		goto __err;
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	c->refcnt = 1;
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	c->lib = lib ? strdup(lib) : NULL;
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	c->name = strdup(name);
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	if ((lib && ! c->lib) || ! c->name) {
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		free((void *)c->name);
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		free((void *)c->lib);
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		free(c);
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	      __err:
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		snd_dlclose(dlobj);
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		snd_dlobj_unlock();
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		return NULL;
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	}
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	c->dlobj = dlobj;
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	c->func = func;
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	list_add_tail(&c->list, &pcm_dlobj_list);
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	return c;
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}
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void *snd_dlobj_cache_get(const char *lib, const char *name,
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			  const char *version, int verbose)
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{
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	struct dlobj_cache *c;
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	void *func = NULL;
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	snd_dlobj_lock();
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	c = snd_dlobj_cache_get0(lib, name, version, verbose);
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	if (c)
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		func = c->func;
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	snd_dlobj_unlock();
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	return func;
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}
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void *snd_dlobj_cache_get2(const char *lib, const char *name,
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			   const char *version, int verbose)
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{
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	struct dlobj_cache *c;
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	void *func = NULL;
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	snd_dlobj_lock();
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	c = snd_dlobj_cache_get0(lib, name, version, verbose);
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	if (c) {
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		func = c->func;
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		/* double reference */
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		c->refcnt++;
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	}
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	snd_dlobj_unlock();
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	return func;
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}
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int snd_dlobj_cache_put(void *func)
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{
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	struct list_head *p;
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	struct dlobj_cache *c;
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	unsigned int refcnt;
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	if (!func)
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		return -ENOENT;
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	snd_dlobj_lock();
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	list_for_each(p, &pcm_dlobj_list) {
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		c = list_entry(p, struct dlobj_cache, list);
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		if (c->func == func) {
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			refcnt = c->refcnt;
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			if (c->refcnt > 0)
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				c->refcnt--;
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			snd_dlobj_unlock();
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			return refcnt == 1 ? 0 : -EINVAL;
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		}
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	}
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	snd_dlobj_unlock();
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	return -ENOENT;
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}
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void snd_dlobj_cache_cleanup(void)
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{
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	struct list_head *p, *npos;
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	struct dlobj_cache *c;
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	snd_dlobj_lock();
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	list_for_each_safe(p, npos, &pcm_dlobj_list) {
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		c = list_entry(p, struct dlobj_cache, list);
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		if (c->refcnt)
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			continue;
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		list_del(p);
Packit Service db8eaa
		snd_dlclose(c->dlobj);
Packit Service db8eaa
		free((void *)c->name); /* shut up gcc warning */
Packit Service db8eaa
		free((void *)c->lib); /* shut up gcc warning */
Packit Service db8eaa
		free(c);
Packit Service db8eaa
	}
Packit Service db8eaa
	snd_dlobj_unlock();
Packit Service db8eaa
	snd_dlpath_lock();
Packit Service db8eaa
	snd_plugin_dir_set = 0;
Packit Service db8eaa
	free(snd_plugin_dir);
Packit Service db8eaa
	snd_plugin_dir = NULL;
Packit Service db8eaa
	snd_dlpath_unlock();
Packit Service db8eaa
}
Packit Service db8eaa
#endif