[libsigrokdecode.git] / srd.c

/*
 * 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;
	int i;

	gstate = PyGILState_Ensure();

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

	s = g_string_sized_new(500);
	g_string_append(s, "Decoder 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));
	}
	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 decoder search paths.");
	PyGILState_Release(gstate);

	return SRD_ERR_PYTHON;
}

SRD_API GSList *srd_searchpaths_get(void)
{
	return g_slist_copy_deep(searchpaths, (GCopyFunc)g_strdup, NULL);
}

/**
 * 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;
}

/**
 * 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, (GFunc)srd_session_destroy, 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
 *
 * @since 0.1.0
 */
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;
}

/** @} */
Commit	Line	Data
190b71cf BV	1	/*
	2	* This file is part of the libsigrokdecode project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
36784362	21	#include <config.h>
f6c7eade MC	22	#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
f6c7eade MC	23	#include "libsigrokdecode.h"
190b71cf BV	24	#include <glib.h>
	25
	26	/** @cond PRIVATE */
	27
ea81b49a BV	28	/* Python module search paths */
	29	SRD_PRIV GSList *searchpaths = NULL;
	30
190b71cf	31	/* session.c */
23a29d24 UH	32	extern SRD_PRIV GSList *sessions;
23a29d24 UH	33	extern SRD_PRIV int max_session_id;
190b71cf	34
190b71cf BV	35	/** @endcond */
	36
	37	/**
	38	* @mainpage libsigrokdecode API
	39	*
	40	* @section sec_intro Introduction
	41	*
	42	* The <a href="http://sigrok.org">sigrok</a> project aims at creating a
	43	* portable, cross-platform, Free/Libre/Open-Source signal analysis software
	44	* suite that supports various device types (such as logic analyzers,
	45	* oscilloscopes, multimeters, and more).
	46	*
	47	* <a href="http://sigrok.org/wiki/Libsigrokdecode">libsigrokdecode</a> is a
	48	* shared library written in C which provides the basic API for (streaming)
	49	* protocol decoding functionality.
	50	*
	51	* The <a href="http://sigrok.org/wiki/Protocol_decoders">protocol decoders</a>
	52	* are written in Python (>= 3.0).
	53	*
	54	* @section sec_api API reference
	55	*
	56	* See the "Modules" page for an introduction to various libsigrokdecode
	57	* related topics and the detailed API documentation of the respective
	58	* functions.
	59	*
	60	* You can also browse the API documentation by file, or review all
	61	* data structures.
	62	*
	63	* @section sec_mailinglists Mailing lists
	64	*
3b884e85	65	* There is one mailing list for sigrok/libsigrokdecode: <a href="https://lists.sourceforge.net/lists/listinfo/sigrok-devel">sigrok-devel</a>.
190b71cf BV	66	*
	67	* @section sec_irc IRC
	68	*
	69	* You can find the sigrok developers in the
	70	* <a href="irc://chat.freenode.net/sigrok">\#sigrok</a>
	71	* IRC channel on Freenode.
	72	*
	73	* @section sec_website Website
	74	*
	75	* <a href="http://sigrok.org/wiki/Libsigrokdecode">sigrok.org/wiki/Libsigrokdecode</a>
	76	*/
	77
	78	/**
	79	* @file
	80	*
	81	* Initializing and shutting down libsigrokdecode.
	82	*/
	83
	84	/**
	85	* @defgroup grp_init Initialization
	86	*
	87	* Initializing and shutting down libsigrokdecode.
	88	*
	89	* Before using any of the libsigrokdecode functionality, srd_init() must
	90	* be called to initialize the library.
	91	*
	92	* When libsigrokdecode functionality is no longer needed, srd_exit() should
	93	* be called.
	94	*
	95	* @{
	96	*/
	97
40c6ac1d DE	98	static int searchpath_add_xdg_dir(const char *datadir)
	99	{
	100	char *decdir;
	101	int ret;
	102
	103	decdir = g_build_filename(datadir, PACKAGE_TARNAME, "decoders", NULL);
	104
	105	if (g_file_test(decdir, G_FILE_TEST_IS_DIR))
	106	ret = srd_decoder_searchpath_add(decdir);
	107	else
	108	ret = SRD_OK; /* just ignore non-existing directory */
	109
	110	g_free(decdir);
	111
	112	return ret;
	113	}
	114
cdb49509 UH	115	static void print_versions(void)
	116	{
	117	GString *s;
	118	GSList l, l_orig, *m;
	119	char *str;
	120	const char lib, version;
	121
	122	srd_dbg("libsigrokdecode %s/%s (rt: %s/%s).",
	123	SRD_PACKAGE_VERSION_STRING, SRD_LIB_VERSION_STRING,
	124	srd_package_version_string_get(), srd_lib_version_string_get());
	125
	126	s = g_string_sized_new(200);
	127	g_string_append(s, "Libs: ");
	128	l_orig = srd_buildinfo_libs_get();
	129	for (l = l_orig; l; l = l->next) {
	130	m = l->data;
	131	lib = m->data;
	132	version = m->next->data;
	133	g_string_append_printf(s, "%s %s, ", lib, version);
	134	g_slist_free_full(m, g_free);
	135	}
	136	g_slist_free(l_orig);
	137	s->str[s->len - 2] = '.';
	138	s->str[s->len - 1] = '\0';
	139	srd_dbg("%s", s->str);
	140	g_string_free(s, TRUE);
	141
	142	str = srd_buildinfo_host_get();
	143	srd_dbg("Host: %s.", str);
	144	g_free(str);
	145	}
	146
a2860c19 UH	147	static int print_searchpaths(void)
	148	{
	149	PyObject py_paths, py_path, *py_bytes;
	150	PyGILState_STATE gstate;
	151	GString *s;
	152	int i;
	153
	154	gstate = PyGILState_Ensure();
	155
	156	py_paths = PySys_GetObject("path");
	157	if (!py_paths)
	158	goto err;
	159
	160	s = g_string_sized_new(500);
	161	g_string_append(s, "Decoder search paths:\n");
	162	for (i = 0; i < PyList_Size(py_paths); i++) {
	163	py_path = PyList_GetItem(py_paths, i);
	164	py_bytes = PyUnicode_AsUTF8String(py_path);
	165	g_string_append_printf(s, " - %s\n", PyBytes_AsString(py_bytes));
	166	}
	167	s->str[s->len - 1] = '\0';
	168	srd_dbg("%s", s->str);
	169	g_string_free(s, TRUE);
	170
	171	PyGILState_Release(gstate);
	172
	173	return SRD_OK;
	174
	175	err:
	176	srd_err("Unable to query decoder search paths.");
	177	PyGILState_Release(gstate);
	178
	179	return SRD_ERR_PYTHON;
	180	}
	181
1a41642e SA	182	SRD_API GSList *srd_searchpaths_get(void)
	183	{
	184	return g_slist_copy_deep(searchpaths, (GCopyFunc)g_strdup, NULL);
	185	}
	186
190b71cf BV	187	/**
	188	* Initialize libsigrokdecode.
	189	*
	190	* This initializes the Python interpreter, and creates and initializes
	191	* a "sigrokdecode" Python module.
	192	*
	193	* Then, it searches for sigrok protocol decoders in the "decoders"
	194	* subdirectory of the the libsigrokdecode installation directory.
	195	* All decoders that are found are loaded into memory and added to an
	196	* internal list of decoders, which can be queried via srd_decoder_list().
	197	*
	198	* The caller is responsible for calling the clean-up function srd_exit(),
	199	* which will properly shut down libsigrokdecode and free its allocated memory.
	200	*
	201	* Multiple calls to srd_init(), without calling srd_exit() in between,
	202	* are not allowed.
	203	*
	204	* @param path Path to an extra directory containing protocol decoders
	205	* which will be added to the Python sys.path. May be NULL.
	206	*
	207	* @return SRD_OK upon success, a (negative) error code otherwise.
	208	* Upon Python errors, SRD_ERR_PYTHON is returned. If the decoders
	209	* directory cannot be accessed, SRD_ERR_DECODERS_DIR is returned.
	210	* If not enough memory could be allocated, SRD_ERR_MALLOC is returned.
	211	*
	212	* @since 0.1.0
	213	*/
	214	SRD_API int srd_init(const char *path)
	215	{
40c6ac1d DE	216	const char const sys_datadirs;
	217	const char *env_path;
	218	size_t i;
190b71cf	219	int ret;
190b71cf BV	220
	221	if (max_session_id != -1) {
	222	srd_err("libsigrokdecode is already initialized.");
	223	return SRD_ERR;
	224	}
	225
cdb49509 UH	226	print_versions();
cdb49509 UH	227
190b71cf BV	228	srd_dbg("Initializing libsigrokdecode.");
	229
	230	/* Add our own module to the list of built-in modules. */
	231	PyImport_AppendInittab("sigrokdecode", PyInit_sigrokdecode);
	232
	233	/* Initialize the Python interpreter. */
45883c6b	234	Py_InitializeEx(0);
190b71cf	235
40c6ac1d DE	236	/* Locations relative to the XDG system data directories. */
	237	sys_datadirs = g_get_system_data_dirs();
	238	for (i = g_strv_length((char **)sys_datadirs); i > 0; i--) {
	239	ret = searchpath_add_xdg_dir(sys_datadirs[i-1]);
	240	if (ret != SRD_OK) {
	241	Py_Finalize();
	242	return ret;
	243	}
	244	}
	245	#ifdef DECODERS_DIR
	246	/* Hardcoded decoders install location, if defined. */
190b71cf BV	247	if ((ret = srd_decoder_searchpath_add(DECODERS_DIR)) != SRD_OK) {
	248	Py_Finalize();
	249	return ret;
	250	}
40c6ac1d DE	251	#endif
	252	/* Location relative to the XDG user data directory. */
	253	ret = searchpath_add_xdg_dir(g_get_user_data_dir());
	254	if (ret != SRD_OK) {
	255	Py_Finalize();
	256	return ret;
	257	}
190b71cf BV	258
	259	/* Path specified by the user. */
	260	if (path) {
	261	if ((ret = srd_decoder_searchpath_add(path)) != SRD_OK) {
	262	Py_Finalize();
	263	return ret;
	264	}
	265	}
	266
	267	/* Environment variable overrides everything, for debugging. */
40c6ac1d	268	if ((env_path = g_getenv("SIGROKDECODE_DIR"))) {
190b71cf BV	269	if ((ret = srd_decoder_searchpath_add(env_path)) != SRD_OK) {
	270	Py_Finalize();
	271	return ret;
	272	}
	273	}
	274
514b2edc UH	275	/* Initialize the Python GIL (this also happens to acquire it). */
	276	PyEval_InitThreads();
	277
	278	/* Release the GIL (ignore return value, we don't need it here). */
	279	(void)PyEval_SaveThread();
	280
190b71cf BV	281	max_session_id = 0;
190b71cf BV	282
a2860c19 UH	283	print_searchpaths();
a2860c19 UH	284
190b71cf BV	285	return SRD_OK;
	286	}
	287
	288	/**
	289	* Shutdown libsigrokdecode.
	290	*
	291	* This frees all the memory allocated for protocol decoders and shuts down
	292	* the Python interpreter.
	293	*
	294	* This function should only be called if there was a (successful!) invocation
	295	* of srd_init() before. Calling this function multiple times in a row, without
	296	* any successful srd_init() calls in between, is not allowed.
	297	*
	298	* @return SRD_OK upon success, a (negative) error code otherwise.
	299	*
	300	* @since 0.1.0
	301	*/
	302	SRD_API int srd_exit(void)
	303	{
190b71cf BV	304	srd_dbg("Exiting libsigrokdecode.");
190b71cf BV	305
95e40a0c	306	g_slist_foreach(sessions, (GFunc)srd_session_destroy, NULL);
190b71cf BV	307
190b71cf BV	308	srd_decoder_unload_all();
ea81b49a BV	309	g_slist_free_full(searchpaths, g_free);
ea81b49a BV	310	searchpaths = NULL;
190b71cf	311
514b2edc UH	312	/*
	313	* Acquire the GIL, otherwise Py_Finalize() might have issues.
	314	* Ignore the return value, we don't need it here.
	315	*/
2071c4d3 UH	316	if (Py_IsInitialized())
2071c4d3 UH	317	(void)PyGILState_Ensure();
514b2edc	318
190b71cf BV	319	/* Py_Finalize() returns void, any finalization errors are ignored. */
	320	Py_Finalize();
	321
514b2edc UH	322	/* Note: No need to release the GIL since Python is shut down now. */
514b2edc UH	323
190b71cf BV	324	max_session_id = -1;
	325
	326	return SRD_OK;
	327	}
	328
	329	/**
	330	* Add an additional search directory for the protocol decoders.
	331	*
	332	* The specified directory is prepended (not appended!) to Python's sys.path,
	333	* in order to search for sigrok protocol decoders in the specified
	334	* directories first, and in the generic Python module directories (and in
	335	* the current working directory) last. This avoids conflicts if there are
	336	* Python modules which have the same name as a sigrok protocol decoder in
	337	* sys.path or in the current working directory.
	338	*
	339	* @param path Path to the directory containing protocol decoders which shall
	340	* be added to the Python sys.path, or NULL.
	341	*
	342	* @return SRD_OK upon success, a (negative) error code otherwise.
	343	*
	344	* @private
	345	*
	346	* @since 0.1.0
	347	*/
	348	SRD_PRIV int srd_decoder_searchpath_add(const char *path)
	349	{
	350	PyObject py_cur_path, py_item;
514b2edc	351	PyGILState_STATE gstate;
190b71cf BV	352
	353	srd_dbg("Adding '%s' to module path.", path);
	354
514b2edc UH	355	gstate = PyGILState_Ensure();
514b2edc UH	356
190b71cf	357	py_cur_path = PySys_GetObject("path");
d8d40959	358	if (!py_cur_path)
514b2edc	359	goto err;
d8d40959 DE	360
	361	py_item = PyUnicode_FromString(path);
	362	if (!py_item) {
	363	srd_exception_catch("Failed to create Unicode object");
514b2edc	364	goto err;
d8d40959 DE	365	}
	366	if (PyList_Insert(py_cur_path, 0, py_item) < 0) {
	367	srd_exception_catch("Failed to insert path element");
	368	Py_DECREF(py_item);
514b2edc	369	goto err;
190b71cf	370	}
d8d40959	371	Py_DECREF(py_item);
190b71cf	372
514b2edc UH	373	PyGILState_Release(gstate);
514b2edc UH	374
d8d40959	375	searchpaths = g_slist_prepend(searchpaths, g_strdup(path));
190b71cf BV	376
190b71cf BV	377	return SRD_OK;
514b2edc UH	378
	379	err:
	380	PyGILState_Release(gstate);
	381
	382	return SRD_ERR_PYTHON;
190b71cf BV	383	}
	384
	385	/** @} */