srd.c - chromiumos/third_party/libsigrokdecode - Git at Google

 /*
  * This file is part of the libsigrokdecode project.
  *
  * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * This program 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 General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <config.h>
 #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
 #include "libsigrokdecode.h"
 #include <glib.h>

 /** @cond PRIVATE */

 /* Python module search paths */
 SRD_PRIV GSList *searchpaths = NULL;

 /* session.c */
 extern SRD_PRIV GSList *sessions;
 extern SRD_PRIV int max_session_id;

 /** @endcond */

 /**
  * @mainpage libsigrokdecode API
  *
  * @section sec_intro Introduction
  *
  * The <a href="http://sigrok.org">sigrok</a> project aims at creating a
  * portable, cross-platform, Free/Libre/Open-Source signal analysis software
  * suite that supports various device types (such as logic analyzers,
  * oscilloscopes, multimeters, and more).
  *
  * <a href="http://sigrok.org/wiki/Libsigrokdecode">libsigrokdecode</a> is a
  * shared library written in C which provides the basic API for (streaming)
  * protocol decoding functionality.
  *
  * The <a href="http://sigrok.org/wiki/Protocol_decoders">protocol decoders</a>
  * are written in Python (>= 3.0).
  *
  * @section sec_api API reference
  *
  * See the "Modules" page for an introduction to various libsigrokdecode
  * related topics and the detailed API documentation of the respective
  * functions.
  *
  * You can also browse the API documentation by file, or review all
  * data structures.
  *
  * @section sec_mailinglists Mailing lists
  *
  * There is one mailing list for sigrok/libsigrokdecode: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a>.
  *
  * @section sec_irc IRC
  *
  * You can find the sigrok developers in the
  * <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
  * IRC channel on Freenode.
  *
  * @section sec_website Website
  *
  * <a href="http://sigrok.org/wiki/Libsigrokdecode">sigrok.org/wiki/Libsigrokdecode</a>
  */

 /**
  * @file
  *
  * Initializing and shutting down libsigrokdecode.
  */

 /**
  * @defgroup grp_init Initialization
  *
  * Initializing and shutting down libsigrokdecode.
  *
  * Before using any of the libsigrokdecode functionality, srd_init() must
  * be called to initialize the library.
  *
  * When libsigrokdecode functionality is no longer needed, srd_exit() should
  * be called.
  *
  * @{
  */

 static int searchpath_add_xdg_dir(const char *datadir)
 {
 	char *decdir;
 	int ret;

 	decdir = g_build_filename(datadir, PACKAGE_TARNAME, "decoders", NULL);

 	if (g_file_test(decdir, G_FILE_TEST_IS_DIR))
 		ret = srd_decoder_searchpath_add(decdir);
 	else
 		ret = SRD_OK; /* Just ignore non-existing directory. */

 	g_free(decdir);

 	return ret;
 }

 static void print_versions(void)
 {
 	GString *s;
 	GSList *l, *l_orig, *m;
 	char *str;
 	const char *lib, *version;

 	srd_dbg("libsigrokdecode %s/%s (rt: %s/%s).",
 		SRD_PACKAGE_VERSION_STRING, SRD_LIB_VERSION_STRING,
 		srd_package_version_string_get(), srd_lib_version_string_get());

 	s = g_string_sized_new(200);
 	g_string_append(s, "Libs: ");
 	l_orig = srd_buildinfo_libs_get();
 	for (l = l_orig; l; l = l->next) {
 		m = l->data;
 		lib = m->data;
 		version = m->next->data;
 		g_string_append_printf(s, "%s %s, ", lib, version);
 		g_slist_free_full(m, g_free);
 	}
 	g_slist_free(l_orig);
 	s->str[s->len - 2] = '.';
 	s->str[s->len - 1] = '\0';
 	srd_dbg("%s", s->str);
 	g_string_free(s, TRUE);

 	str = srd_buildinfo_host_get();
 	srd_dbg("Host: %s.", str);
 	g_free(str);
 }

 static int print_searchpaths(void)
 {
 	PyObject *py_paths, *py_path, *py_bytes;
 	PyGILState_STATE gstate;
 	GString *s;
 	GSList *l;
 	int i;

 	s = g_string_sized_new(500);
 	g_string_append(s, "Protocol decoder search paths:\n");
 	for (l = searchpaths; l; l = l->next)
 		g_string_append_printf(s, " - %s\n", (const char *)l->data);
 	s->str[s->len - 1] = '\0';
 	srd_dbg("%s", s->str);
 	g_string_free(s, TRUE);

 	gstate = PyGILState_Ensure();

 	py_paths = PySys_GetObject("path");
 	if (!py_paths)
 		goto err;

 	s = g_string_sized_new(500);
 	g_string_append(s, "Python system search paths:\n");
 	for (i = 0; i < PyList_Size(py_paths); i++) {
 		py_path = PyList_GetItem(py_paths, i);
 		py_bytes = PyUnicode_AsUTF8String(py_path);
 		g_string_append_printf(s, " - %s\n", PyBytes_AsString(py_bytes));
 		Py_DECREF(py_bytes);
 	}
 	s->str[s->len - 1] = '\0';
 	srd_dbg("%s", s->str);
 	g_string_free(s, TRUE);

 	PyGILState_Release(gstate);

 	return SRD_OK;

 err:
 	srd_err("Unable to query Python system search paths.");
 	PyGILState_Release(gstate);

 	return SRD_ERR_PYTHON;
 }

 /**
  * Initialize libsigrokdecode.
  *
  * This initializes the Python interpreter, and creates and initializes
  * a "sigrokdecode" Python module.
  *
  * Then, it searches for sigrok protocol decoders in the "decoders"
  * subdirectory of the the libsigrokdecode installation directory.
  * All decoders that are found are loaded into memory and added to an
  * internal list of decoders, which can be queried via srd_decoder_list().
  *
  * The caller is responsible for calling the clean-up function srd_exit(),
  * which will properly shut down libsigrokdecode and free its allocated memory.
  *
  * Multiple calls to srd_init(), without calling srd_exit() in between,
  * are not allowed.
  *
  * @param path Path to an extra directory containing protocol decoders
  *             which will be added to the Python sys.path. May be NULL.
  *
  * @return SRD_OK upon success, a (negative) error code otherwise.
  *         Upon Python errors, SRD_ERR_PYTHON is returned. If the decoders
  *         directory cannot be accessed, SRD_ERR_DECODERS_DIR is returned.
  *         If not enough memory could be allocated, SRD_ERR_MALLOC is returned.
  *
  * @since 0.1.0
  */
 SRD_API int srd_init(const char *path)
 {
 	const char *const *sys_datadirs;
 	const char *env_path;
 	size_t i;
 	int ret;

 	if (max_session_id != -1) {
 		srd_err("libsigrokdecode is already initialized.");
 		return SRD_ERR;
 	}

 	print_versions();

 	srd_dbg("Initializing libsigrokdecode.");

 	/* Add our own module to the list of built-in modules. */
 	PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode);

 	/* Initialize the Python interpreter. */
 	Py_InitializeEx(0);

 	/* Locations relative to the XDG system data directories. */
 	sys_datadirs = g_get_system_data_dirs();
 	for (i = g_strv_length((char **)sys_datadirs); i > 0; i--) {
 		ret = searchpath_add_xdg_dir(sys_datadirs[i - 1]);
 		if (ret != SRD_OK) {
 			Py_Finalize();
 			return ret;
 		}
 	}
 #ifdef DECODERS_DIR
 	/* Hardcoded decoders install location, if defined. */
 	if ((ret = srd_decoder_searchpath_add(DECODERS_DIR)) != SRD_OK) {
 		Py_Finalize();
 		return ret;
 	}
 #endif
 	/* Location relative to the XDG user data directory. */
 	ret = searchpath_add_xdg_dir(g_get_user_data_dir());
 	if (ret != SRD_OK) {
 		Py_Finalize();
 		return ret;
 	}

 	/* Path specified by the user. */
 	if (path) {
 		if ((ret = srd_decoder_searchpath_add(path)) != SRD_OK) {
 			Py_Finalize();
 			return ret;
 		}
 	}

 	/* Environment variable overrides everything, for debugging. */
 	if ((env_path = g_getenv("SIGROKDECODE_DIR"))) {
 		if ((ret = srd_decoder_searchpath_add(env_path)) != SRD_OK) {
 			Py_Finalize();
 			return ret;
 		}
 	}

 	/* Initialize the Python GIL (this also happens to acquire it). */
 	PyEval_InitThreads();

 	/* Release the GIL (ignore return value, we don't need it here). */
 	(void)PyEval_SaveThread();

 	max_session_id = 0;

 	print_searchpaths();

 	return SRD_OK;
 }

 static void srd_session_destroy_cb(void *arg, void *ignored)
 {
 	(void)ignored; // Prevent unused warning
 	srd_session_destroy((struct srd_session *)arg);
 }

 /**
  * Shutdown libsigrokdecode.
  *
  * This frees all the memory allocated for protocol decoders and shuts down
  * the Python interpreter.
  *
  * This function should only be called if there was a (successful!) invocation
  * of srd_init() before. Calling this function multiple times in a row, without
  * any successful srd_init() calls in between, is not allowed.
  *
  * @return SRD_OK upon success, a (negative) error code otherwise.
  *
  * @since 0.1.0
  */
 SRD_API int srd_exit(void)
 {
 	srd_dbg("Exiting libsigrokdecode.");

 	g_slist_foreach(sessions, srd_session_destroy_cb, NULL);
 	g_slist_free(sessions);
 	sessions = NULL;

 	srd_decoder_unload_all();
 	g_slist_free_full(searchpaths, g_free);
 	searchpaths = NULL;

 	/*
 	 * Acquire the GIL, otherwise Py_Finalize() might have issues.
 	 * Ignore the return value, we don't need it here.
 	 */
 	if (Py_IsInitialized())
 		(void)PyGILState_Ensure();

 	/* Py_Finalize() returns void, any finalization errors are ignored. */
 	Py_Finalize();

 	/* Note: No need to release the GIL since Python is shut down now. */

 	max_session_id = -1;

 	return SRD_OK;
 }

 /**
  * Add an additional search directory for the protocol decoders.
  *
  * The specified directory is prepended (not appended!) to Python's sys.path,
  * in order to search for sigrok protocol decoders in the specified
  * directories first, and in the generic Python module directories (and in
  * the current working directory) last. This avoids conflicts if there are
  * Python modules which have the same name as a sigrok protocol decoder in
  * sys.path or in the current working directory.
  *
  * @param path Path to the directory containing protocol decoders which shall
  *             be added to the Python sys.path, or NULL.
  *
  * @return SRD_OK upon success, a (negative) error code otherwise.
  *
  * @private
  */
 SRD_PRIV int srd_decoder_searchpath_add(const char *path)
 {
 	PyObject *py_cur_path, *py_item;
 	PyGILState_STATE gstate;

 	srd_dbg("Adding '%s' to module path.", path);

 	gstate = PyGILState_Ensure();

 	py_cur_path = PySys_GetObject("path");
 	if (!py_cur_path)
 		goto err;

 	py_item = PyUnicode_FromString(path);
 	if (!py_item) {
 		srd_exception_catch("Failed to create Unicode object");
 		goto err;
 	}
 	if (PyList_Insert(py_cur_path, 0, py_item) < 0) {
 		srd_exception_catch("Failed to insert path element");
 		Py_DECREF(py_item);
 		goto err;
 	}
 	Py_DECREF(py_item);

 	PyGILState_Release(gstate);

 	searchpaths = g_slist_prepend(searchpaths, g_strdup(path));

 	return SRD_OK;

 err:
 	PyGILState_Release(gstate);

 	return SRD_ERR_PYTHON;
 }

 /**
  * Return the list of protocol decoder search paths.
  *
  * @return The list of search paths used when loading protocol decoders.
  *
  * @since 0.5.1
  */
 SRD_API GSList *srd_searchpaths_get(void)
 {
 	GSList *paths = NULL;

 	for (GSList *l = searchpaths; l; l = l->next)
 		paths = g_slist_append(paths, g_strdup(l->data));

 	return paths;
 }

 /** @} */
	/*
	* This file is part of the libsigrokdecode project.
	*
	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or
	* (at your option) any later version.
	*
	* This program 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 General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <config.h>
	#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
	#include "libsigrokdecode.h"
	#include <glib.h>

	/** @cond PRIVATE */

	/* Python module search paths */
	SRD_PRIV GSList *searchpaths = NULL;

	/* session.c */
	extern SRD_PRIV GSList *sessions;
	extern SRD_PRIV int max_session_id;

	/** @endcond */

	/**
	* @mainpage libsigrokdecode API
	*
	* @section sec_intro Introduction
	*
	* The <a href="http://sigrok.org">sigrok</a> project aims at creating a
	* portable, cross-platform, Free/Libre/Open-Source signal analysis software
	* suite that supports various device types (such as logic analyzers,
	* oscilloscopes, multimeters, and more).
	*
	* <a href="http://sigrok.org/wiki/Libsigrokdecode">libsigrokdecode</a> is a
	* shared library written in C which provides the basic API for (streaming)
	* protocol decoding functionality.
	*
	* The <a href="http://sigrok.org/wiki/Protocol_decoders">protocol decoders</a>
	* are written in Python (>= 3.0).
	*
	* @section sec_api API reference
	*
	* See the "Modules" page for an introduction to various libsigrokdecode
	* related topics and the detailed API documentation of the respective
	* functions.
	*
	* You can also browse the API documentation by file, or review all
	* data structures.
	*
	* @section sec_mailinglists Mailing lists
	*
	* There is one mailing list for sigrok/libsigrokdecode: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a>.
	*
	* @section sec_irc IRC
	*
	* You can find the sigrok developers in the
	* <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
	* IRC channel on Freenode.
	*
	* @section sec_website Website
	*
	* <a href="http://sigrok.org/wiki/Libsigrokdecode">sigrok.org/wiki/Libsigrokdecode</a>
	*/

	/**
	* @file
	*
	* Initializing and shutting down libsigrokdecode.
	*/

	/**
	* @defgroup grp_init Initialization
	*
	* Initializing and shutting down libsigrokdecode.
	*
	* Before using any of the libsigrokdecode functionality, srd_init() must
	* be called to initialize the library.
	*
	* When libsigrokdecode functionality is no longer needed, srd_exit() should
	* be called.
	*
	* @{
	*/

	static int searchpath_add_xdg_dir(const char *datadir)
	{
	char *decdir;
	int ret;

	decdir = g_build_filename(datadir, PACKAGE_TARNAME, "decoders", NULL);

	if (g_file_test(decdir, G_FILE_TEST_IS_DIR))
	ret = srd_decoder_searchpath_add(decdir);
	else
	ret = SRD_OK; /* Just ignore non-existing directory. */

	g_free(decdir);

	return ret;
	}

	static void print_versions(void)
	{
	GString *s;
	GSList l, l_orig, *m;
	char *str;
	const char lib, version;

	srd_dbg("libsigrokdecode %s/%s (rt: %s/%s).",
	SRD_PACKAGE_VERSION_STRING, SRD_LIB_VERSION_STRING,
	srd_package_version_string_get(), srd_lib_version_string_get());

	s = g_string_sized_new(200);
	g_string_append(s, "Libs: ");
	l_orig = srd_buildinfo_libs_get();
	for (l = l_orig; l; l = l->next) {
	m = l->data;
	lib = m->data;
	version = m->next->data;
	g_string_append_printf(s, "%s %s, ", lib, version);
	g_slist_free_full(m, g_free);
	}
	g_slist_free(l_orig);
	s->str[s->len - 2] = '.';
	s->str[s->len - 1] = '\0';
	srd_dbg("%s", s->str);
	g_string_free(s, TRUE);

	str = srd_buildinfo_host_get();
	srd_dbg("Host: %s.", str);
	g_free(str);
	}

	static int print_searchpaths(void)
	{
	PyObject py_paths, py_path, *py_bytes;
	PyGILState_STATE gstate;
	GString *s;
	GSList *l;
	int i;

	s = g_string_sized_new(500);
	g_string_append(s, "Protocol decoder search paths:\n");
	for (l = searchpaths; l; l = l->next)
	g_string_append_printf(s, " - %s\n", (const char *)l->data);
	s->str[s->len - 1] = '\0';
	srd_dbg("%s", s->str);
	g_string_free(s, TRUE);

	gstate = PyGILState_Ensure();

	py_paths = PySys_GetObject("path");
	if (!py_paths)
	goto err;

	s = g_string_sized_new(500);
	g_string_append(s, "Python system search paths:\n");
	for (i = 0; i < PyList_Size(py_paths); i++) {
	py_path = PyList_GetItem(py_paths, i);
	py_bytes = PyUnicode_AsUTF8String(py_path);
	g_string_append_printf(s, " - %s\n", PyBytes_AsString(py_bytes));
	Py_DECREF(py_bytes);
	}
	s->str[s->len - 1] = '\0';
	srd_dbg("%s", s->str);
	g_string_free(s, TRUE);

	PyGILState_Release(gstate);

	return SRD_OK;

	err:
	srd_err("Unable to query Python system search paths.");
	PyGILState_Release(gstate);

	return SRD_ERR_PYTHON;
	}

	/**
	* Initialize libsigrokdecode.
	*
	* This initializes the Python interpreter, and creates and initializes
	* a "sigrokdecode" Python module.
	*
	* Then, it searches for sigrok protocol decoders in the "decoders"
	* subdirectory of the the libsigrokdecode installation directory.
	* All decoders that are found are loaded into memory and added to an
	* internal list of decoders, which can be queried via srd_decoder_list().
	*
	* The caller is responsible for calling the clean-up function srd_exit(),
	* which will properly shut down libsigrokdecode and free its allocated memory.
	*
	* Multiple calls to srd_init(), without calling srd_exit() in between,
	* are not allowed.
	*
	* @param path Path to an extra directory containing protocol decoders
	* which will be added to the Python sys.path. May be NULL.
	*
	* @return SRD_OK upon success, a (negative) error code otherwise.
	* Upon Python errors, SRD_ERR_PYTHON is returned. If the decoders
	* directory cannot be accessed, SRD_ERR_DECODERS_DIR is returned.
	* If not enough memory could be allocated, SRD_ERR_MALLOC is returned.
	*
	* @since 0.1.0
	*/
	SRD_API int srd_init(const char *path)
	{
	const char const sys_datadirs;
	const char *env_path;
	size_t i;
	int ret;

	if (max_session_id != -1) {
	srd_err("libsigrokdecode is already initialized.");
	return SRD_ERR;
	}

	print_versions();

	srd_dbg("Initializing libsigrokdecode.");

	/* Add our own module to the list of built-in modules. */
	PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode);

	/* Initialize the Python interpreter. */
	Py_InitializeEx(0);

	/* Locations relative to the XDG system data directories. */
	sys_datadirs = g_get_system_data_dirs();
	for (i = g_strv_length((char **)sys_datadirs); i > 0; i--) {
	ret = searchpath_add_xdg_dir(sys_datadirs[i - 1]);
	if (ret != SRD_OK) {
	Py_Finalize();
	return ret;
	}
	}
	#ifdef DECODERS_DIR
	/* Hardcoded decoders install location, if defined. */
	if ((ret = srd_decoder_searchpath_add(DECODERS_DIR)) != SRD_OK) {
	Py_Finalize();
	return ret;
	}
	#endif
	/* Location relative to the XDG user data directory. */
	ret = searchpath_add_xdg_dir(g_get_user_data_dir());
	if (ret != SRD_OK) {
	Py_Finalize();
	return ret;
	}

	/* Path specified by the user. */
	if (path) {
	if ((ret = srd_decoder_searchpath_add(path)) != SRD_OK) {
	Py_Finalize();
	return ret;
	}
	}

	/* Environment variable overrides everything, for debugging. */
	if ((env_path = g_getenv("SIGROKDECODE_DIR"))) {
	if ((ret = srd_decoder_searchpath_add(env_path)) != SRD_OK) {
	Py_Finalize();
	return ret;
	}
	}

	/* Initialize the Python GIL (this also happens to acquire it). */
	PyEval_InitThreads();

	/* Release the GIL (ignore return value, we don't need it here). */
	(void)PyEval_SaveThread();

	max_session_id = 0;

	print_searchpaths();

	return SRD_OK;
	}

	static void srd_session_destroy_cb(void arg, void ignored)
	{
	(void)ignored; // Prevent unused warning
	srd_session_destroy((struct srd_session *)arg);
	}

	/**
	* Shutdown libsigrokdecode.
	*
	* This frees all the memory allocated for protocol decoders and shuts down
	* the Python interpreter.
	*
	* This function should only be called if there was a (successful!) invocation
	* of srd_init() before. Calling this function multiple times in a row, without
	* any successful srd_init() calls in between, is not allowed.
	*
	* @return SRD_OK upon success, a (negative) error code otherwise.
	*
	* @since 0.1.0
	*/
	SRD_API int srd_exit(void)
	{
	srd_dbg("Exiting libsigrokdecode.");

	g_slist_foreach(sessions, srd_session_destroy_cb, NULL);
	g_slist_free(sessions);
	sessions = NULL;

	srd_decoder_unload_all();
	g_slist_free_full(searchpaths, g_free);
	searchpaths = NULL;

	/*
	* Acquire the GIL, otherwise Py_Finalize() might have issues.
	* Ignore the return value, we don't need it here.
	*/
	if (Py_IsInitialized())
	(void)PyGILState_Ensure();

	/* Py_Finalize() returns void, any finalization errors are ignored. */
	Py_Finalize();

	/* Note: No need to release the GIL since Python is shut down now. */

	max_session_id = -1;

	return SRD_OK;
	}

	/**
	* Add an additional search directory for the protocol decoders.
	*
	* The specified directory is prepended (not appended!) to Python's sys.path,
	* in order to search for sigrok protocol decoders in the specified
	* directories first, and in the generic Python module directories (and in
	* the current working directory) last. This avoids conflicts if there are
	* Python modules which have the same name as a sigrok protocol decoder in
	* sys.path or in the current working directory.
	*
	* @param path Path to the directory containing protocol decoders which shall
	* be added to the Python sys.path, or NULL.
	*
	* @return SRD_OK upon success, a (negative) error code otherwise.
	*
	* @private
	*/
	SRD_PRIV int srd_decoder_searchpath_add(const char *path)
	{
	PyObject py_cur_path, py_item;
	PyGILState_STATE gstate;

	srd_dbg("Adding '%s' to module path.", path);

	gstate = PyGILState_Ensure();

	py_cur_path = PySys_GetObject("path");
	if (!py_cur_path)
	goto err;

	py_item = PyUnicode_FromString(path);
	if (!py_item) {
	srd_exception_catch("Failed to create Unicode object");
	goto err;
	}
	if (PyList_Insert(py_cur_path, 0, py_item) < 0) {
	srd_exception_catch("Failed to insert path element");
	Py_DECREF(py_item);
	goto err;
	}
	Py_DECREF(py_item);

	PyGILState_Release(gstate);

	searchpaths = g_slist_prepend(searchpaths, g_strdup(path));

	return SRD_OK;

	err:
	PyGILState_Release(gstate);

	return SRD_ERR_PYTHON;
	}

	/**
	* Return the list of protocol decoder search paths.
	*
	* @return The list of search paths used when loading protocol decoders.
	*
	* @since 0.5.1
	*/
	SRD_API GSList *srd_searchpaths_get(void)
	{
	GSList *paths = NULL;

	for (GSList *l = searchpaths; l; l = l->next)
	paths = g_slist_append(paths, g_strdup(l->data));

	return paths;
	}

	/** @} */