[ust.git] / libust / marker-control.c

/*
 * Copyright (C) 2007 Mathieu Desnoyers
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 *
 */

/* This file contains a high-level API for activating and deactivating markers,
 * and making sure markers in a given library can be released when the library
 * is unloaded.
 */

#include <ctype.h>
#include <stdlib.h>

#include "tracer.h"
#include "usterr.h"

#define DEFAULT_CHANNEL "cpu"
#define DEFAULT_PROBE "default"

LIST_HEAD(probes_list);

/*
 * Mutex protecting the probe slab cache.
 * Nests inside the traces mutex.
 */
DEFINE_MUTEX(probes_mutex);

struct ltt_available_probe default_probe = {
	.name = "default",
	.format = NULL,
	.probe_func = ltt_vtrace,
	.callbacks[0] = ltt_serialize_data,
};

//ust//static struct kmem_cache *markers_loaded_cachep;
static LIST_HEAD(markers_loaded_list);
/*
 * List sorted by name strcmp order.
 */
static LIST_HEAD(probes_registered_list);

//ust// static struct proc_dir_entry *pentry;

//ust// static struct file_operations ltt_fops;

static struct ltt_available_probe *get_probe_from_name(const char *pname)
{
	struct ltt_available_probe *iter;
	int comparison, found = 0;

	if (!pname)
		pname = DEFAULT_PROBE;
	list_for_each_entry(iter, &probes_registered_list, node) {
		comparison = strcmp(pname, iter->name);
		if (!comparison)
			found = 1;
		if (comparison <= 0)
			break;
	}
	if (found)
		return iter;
	else
		return NULL;
}

/* (unused)
static char *skip_spaces(char *buf)
{
	while (*buf != '\0' && isspace(*buf))
		buf++;
	return buf;
}

static char *skip_nonspaces(char *buf)
{
	while (*buf != '\0' && !isspace(*buf))
		buf++;
	return buf;
}

static void get_marker_string(char *buf, char **start,
		char **end)
{
	*start = skip_spaces(buf);
	*end = skip_nonspaces(*start);
	**end = '\0';
}
*/

int ltt_probe_register(struct ltt_available_probe *pdata)
{
	int ret = 0;
	int comparison;
	struct ltt_available_probe *iter;

	pthread_mutex_lock(&probes_mutex);
	list_for_each_entry_reverse(iter, &probes_registered_list, node) {
		comparison = strcmp(pdata->name, iter->name);
		if (!comparison) {
			ret = -EBUSY;
			goto end;
		} else if (comparison > 0) {
			/* We belong to the location right after iter. */
			list_add(&pdata->node, &iter->node);
			goto end;
		}
	}
	/* Should be added at the head of the list */
	list_add(&pdata->node, &probes_registered_list);
end:
	pthread_mutex_unlock(&probes_mutex);
	return ret;
}

/*
 * Called when a probe does not want to be called anymore.
 */
int ltt_probe_unregister(struct ltt_available_probe *pdata)
{
	int ret = 0;
	struct ltt_active_marker *amark, *tmp;

	pthread_mutex_lock(&probes_mutex);
	list_for_each_entry_safe(amark, tmp, &markers_loaded_list, node) {
		if (amark->probe == pdata) {
			ret = marker_probe_unregister_private_data(
				pdata->probe_func, amark);
			if (ret)
				goto end;
			list_del(&amark->node);
			free(amark);
		}
	}
	list_del(&pdata->node);
end:
	pthread_mutex_unlock(&probes_mutex);
	return ret;
}

/*
 * Connect marker "mname" to probe "pname".
 * Only allow _only_ probe instance to be connected to a marker.
 */
int ltt_marker_connect(const char *channel, const char *mname,
		       const char *pname)

{
	int ret;
	struct ltt_active_marker *pdata;
	struct ltt_available_probe *probe;

	ltt_lock_traces();
	pthread_mutex_lock(&probes_mutex);
	probe = get_probe_from_name(pname);
	if (!probe) {
		ret = -ENOENT;
		goto end;
	}
	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	if (pdata && !IS_ERR(pdata)) {
		ret = -EEXIST;
		goto end;
	}
	pdata = zmalloc(sizeof(struct ltt_active_marker));
	if (!pdata) {
		ret = -ENOMEM;
		goto end;
	}
	pdata->probe = probe;
	/*
	 * ID has priority over channel in case of conflict.
	 */
	ret = marker_probe_register(channel, mname, NULL,
		probe->probe_func, pdata);
	if (ret)
		free(pdata);
	else
		list_add(&pdata->node, &markers_loaded_list);
end:
	pthread_mutex_unlock(&probes_mutex);
	ltt_unlock_traces();
	return ret;
}

/*
 * Disconnect marker "mname", probe "pname".
 */
int ltt_marker_disconnect(const char *channel, const char *mname,
			  const char *pname)
{
	struct ltt_active_marker *pdata;
	struct ltt_available_probe *probe;
	int ret = 0;

	pthread_mutex_lock(&probes_mutex);
	probe = get_probe_from_name(pname);
	if (!probe) {
		ret = -ENOENT;
		goto end;
	}
	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	if (IS_ERR(pdata)) {
		ret = PTR_ERR(pdata);
		goto end;
	} else if (!pdata) {
		/*
		 * Not registered by us.
		 */
		ret = -EPERM;
		goto end;
	}
	ret = marker_probe_unregister(channel, mname, probe->probe_func, pdata);
	if (ret)
		goto end;
	else {
		list_del(&pdata->node);
		free(pdata);
	}
end:
	pthread_mutex_unlock(&probes_mutex);
	return ret;
}

/*
 * function handling proc entry write.
 *
 * connect <channel name> <marker name> [<probe name>]]
 * disconnect <channel name> <marker name> [<probe name>]
 */
//ust// static ssize_t ltt_write(struct file *file, const char __user *buffer,
//ust// 			   size_t count, loff_t *offset)
//ust// {
//ust// 	char *kbuf;
//ust// 	char *iter, *marker_action, *arg[4];
//ust// 	ssize_t ret;
//ust// 	int i;
//ust// 
//ust// 	if (!count)
//ust// 		return -EINVAL;
//ust// 
//ust// 	kbuf = vmalloc(count + 1);
//ust// 	kbuf[count] = '\0';		/* Transform into a string */
//ust// 	ret = copy_from_user(kbuf, buffer, count);
//ust// 	if (ret) {
//ust// 		ret = -EINVAL;
//ust// 		goto end;
//ust// 	}
//ust// 	get_marker_string(kbuf, &marker_action, &iter);
//ust// 	if (!marker_action || marker_action == iter) {
//ust// 		ret = -EINVAL;
//ust// 		goto end;
//ust// 	}
//ust// 	for (i = 0; i < 4; i++) {
//ust// 		arg[i] = NULL;
//ust// 		if (iter < kbuf + count) {
//ust// 			iter++;			/* skip the added '\0' */
//ust// 			get_marker_string(iter, &arg[i], &iter);
//ust// 			if (arg[i] == iter)
//ust// 				arg[i] = NULL;
//ust// 		}
//ust// 	}
//ust// 
//ust// 	if (!arg[0] || !arg[1]) {
//ust// 		ret = -EINVAL;
//ust// 		goto end;
//ust// 	}
//ust// 
//ust// 	if (!strcmp(marker_action, "connect")) {
//ust// 		ret = ltt_marker_connect(arg[0], arg[1], arg[2]);
//ust// 		if (ret)
//ust// 			goto end;
//ust// 	} else if (!strcmp(marker_action, "disconnect")) {
//ust// 		ret = ltt_marker_disconnect(arg[0], arg[1], arg[2]);
//ust// 		if (ret)
//ust// 			goto end;
//ust// 	}
//ust// 	ret = count;
//ust// end:
//ust// 	vfree(kbuf);
//ust// 	return ret;
//ust// }
//ust// 
//ust// static void *s_next(struct seq_file *m, void *p, loff_t *pos)
//ust// {
//ust// 	struct marker_iter *iter = m->private;
//ust// 
//ust// 	marker_iter_next(iter);
//ust// 	if (!iter->marker) {
//ust// 		/*
//ust// 		 * Setting the iter module to -1UL will make sure
//ust// 		 * that no module can possibly hold the current marker.
//ust// 		 */
//ust// 		iter->module = (void *)-1UL;
//ust// 		return NULL;
//ust// 	}
//ust// 	return iter->marker;
//ust// }
//ust// 
//ust// static void *s_start(struct seq_file *m, loff_t *pos)
//ust// {
//ust// 	struct marker_iter *iter = m->private;
//ust// 
//ust// 	if (!*pos)
//ust// 		marker_iter_reset(iter);
//ust// 	marker_iter_start(iter);
//ust// 	if (!iter->marker) {
//ust// 		/*
//ust// 		 * Setting the iter module to -1UL will make sure
//ust// 		 * that no module can possibly hold the current marker.
//ust// 		 */
//ust// 		iter->module = (void *)-1UL;
//ust// 		return NULL;
//ust// 	}
//ust// 	return iter->marker;
//ust// }
//ust// 
//ust// static void s_stop(struct seq_file *m, void *p)
//ust// {
//ust// 	marker_iter_stop(m->private);
//ust// }
//ust// 
//ust// static int s_show(struct seq_file *m, void *p)
//ust// {
//ust// 	struct marker_iter *iter = m->private;
//ust// 
//ust// 	seq_printf(m, "channel: %s marker: %s format: \"%s\" state: %d "
//ust// 		"event_id: %hu call: 0x%p probe %s : 0x%p\n",
//ust// 		iter->marker->channel,
//ust// 		iter->marker->name, iter->marker->format,
//ust// 		_imv_read(iter->marker->state),
//ust// 		iter->marker->event_id,
//ust// 		iter->marker->call,
//ust// 		iter->marker->ptype ? "multi" : "single",
//ust// 		iter->marker->ptype ?
//ust// 		(void*)iter->marker->multi : (void*)iter->marker->single.func);
//ust// 	return 0;
//ust// }
//ust// 
//ust// static const struct seq_operations ltt_seq_op = {
//ust// 	.start = s_start,
//ust// 	.next = s_next,
//ust// 	.stop = s_stop,
//ust// 	.show = s_show,
//ust// };
//ust// 
//ust// static int ltt_open(struct inode *inode, struct file *file)
//ust// {
//ust// 	/*
//ust// 	 * Iterator kept in m->private.
//ust// 	 * Restart iteration on all modules between reads because we do not lock
//ust// 	 * the module mutex between those.
//ust// 	 */
//ust// 	int ret;
//ust// 	struct marker_iter *iter;
//ust// 
//ust// 	iter = kzalloc(sizeof(*iter), GFP_KERNEL);
//ust// 	if (!iter)
//ust// 		return -ENOMEM;
//ust// 
//ust// 	ret = seq_open(file, &ltt_seq_op);
//ust// 	if (ret == 0)
//ust// 		((struct seq_file *)file->private_data)->private = iter;
//ust// 	else
//ust// 		kfree(iter);
//ust// 	return ret;
//ust// }
//ust// 
//ust// static struct file_operations ltt_fops = {
//ust// 	.write = ltt_write,
//ust// 	.open = ltt_open,
//ust// 	.read = seq_read,
//ust// 	.llseek = seq_lseek,
//ust// 	.release = seq_release_private,
//ust// };

static void disconnect_all_markers(void)
{
	struct ltt_active_marker *pdata, *tmp;

	list_for_each_entry_safe(pdata, tmp, &markers_loaded_list, node) {
		marker_probe_unregister_private_data(pdata->probe->probe_func,
			pdata);
		list_del(&pdata->node);
		free(pdata);
	}
}

static char initialized = 0;

void __attribute__((constructor)) init_marker_control(void)
{
	if(!initialized) {
		int ret;

//ust//	pentry = create_proc_entry("ltt", S_IRUSR|S_IWUSR, NULL);
//ust//	if (!pentry)
//ust//		return -EBUSY;
//ust//	markers_loaded_cachep = KMEM_CACHE(ltt_active_marker, 0);

		ret = ltt_probe_register(&default_probe);
		BUG_ON(ret);
		ret = ltt_marker_connect("metadata", "core_marker_format",
					 DEFAULT_PROBE);
		BUG_ON(ret);
		ret = ltt_marker_connect("metadata", "core_marker_id", DEFAULT_PROBE);
		BUG_ON(ret);
//ust//	pentry->proc_fops = &ltt_fops;

		initialized = 1;
	}
}
//ust// module_init(marker_control_init);

static void __attribute__((destructor)) marker_control_exit(void)
{
	int ret;

//ust//	remove_proc_entry("ltt", NULL);
	ret = ltt_marker_disconnect("metadata", "core_marker_format",
				    DEFAULT_PROBE);
	BUG_ON(ret);
	ret = ltt_marker_disconnect("metadata", "core_marker_id",
				    DEFAULT_PROBE);
	BUG_ON(ret);
	ret = ltt_probe_unregister(&default_probe);
	BUG_ON(ret);
	disconnect_all_markers();
//ust//	kmem_cache_destroy(markers_loaded_cachep);
//ust//	marker_synchronize_unregister();
}
//ust// module_exit(marker_control_exit);

//ust// MODULE_LICENSE("GPL");
//ust// MODULE_AUTHOR("Mathieu Desnoyers");
//ust// MODULE_DESCRIPTION("Linux Trace Toolkit Marker Control");
Commit	Line	Data
ba6459ba PMF	1	/*
	2	* Copyright (C) 2007 Mathieu Desnoyers
	3	*
34e4b7db PMF	4	* This library is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU Lesser General Public
	6	* License as published by the Free Software Foundation; either
	7	* version 2.1 of the License, or (at your option) any later version.
ba6459ba	8	*
34e4b7db	9	* This library is distributed in the hope that it will be useful,
ba6459ba	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
34e4b7db PMF	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
34e4b7db PMF	12	* Lesser General Public License for more details.
ba6459ba	13	*
34e4b7db PMF	14	* You should have received a copy of the GNU Lesser General Public
	15	* License along with this library; if not, write to the Free Software
	16	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
ba6459ba	17	*
93e5ce29 PMF	18	*/
	19
	20	/* This file contains a high-level API for activating and deactivating markers,
	21	* and making sure markers in a given library can be released when the library
	22	* is unloaded.
ba6459ba PMF	23	*/
ba6459ba PMF	24
772030fe	25	#include <ctype.h>
909bc43f	26	#include <stdlib.h>
772030fe	27
c93858f1	28	#include "tracer.h"
6af64c43	29	#include "usterr.h"
ba6459ba PMF	30
	31	#define DEFAULT_CHANNEL "cpu"
	32	#define DEFAULT_PROBE "default"
	33
	34	LIST_HEAD(probes_list);
	35
	36	/*
	37	* Mutex protecting the probe slab cache.
	38	* Nests inside the traces mutex.
	39	*/
	40	DEFINE_MUTEX(probes_mutex);
	41
	42	struct ltt_available_probe default_probe = {
	43	.name = "default",
	44	.format = NULL,
	45	.probe_func = ltt_vtrace,
	46	.callbacks[0] = ltt_serialize_data,
	47	};
	48
	49	//ust//static struct kmem_cache *markers_loaded_cachep;
	50	static LIST_HEAD(markers_loaded_list);
	51	/*
	52	* List sorted by name strcmp order.
	53	*/
	54	static LIST_HEAD(probes_registered_list);
	55
	56	//ust// static struct proc_dir_entry *pentry;
	57
	58	//ust// static struct file_operations ltt_fops;
	59
	60	static struct ltt_available_probe get_probe_from_name(const char pname)
	61	{
	62	struct ltt_available_probe *iter;
	63	int comparison, found = 0;
	64
	65	if (!pname)
	66	pname = DEFAULT_PROBE;
	67	list_for_each_entry(iter, &probes_registered_list, node) {
	68	comparison = strcmp(pname, iter->name);
	69	if (!comparison)
	70	found = 1;
	71	if (comparison <= 0)
	72	break;
	73	}
	74	if (found)
	75	return iter;
	76	else
	77	return NULL;
	78	}
	79
772030fe	80	/* (unused)
ba6459ba PMF	81	static char skip_spaces(char buf)
	82	{
	83	while (buf != '\0' && isspace(buf))
	84	buf++;
	85	return buf;
	86	}
	87
	88	static char skip_nonspaces(char buf)
	89	{
	90	while (buf != '\0' && !isspace(buf))
	91	buf++;
	92	return buf;
	93	}
	94
	95	static void get_marker_string(char buf, char *start,
	96	char **end)
	97	{
	98	*start = skip_spaces(buf);
	99	end = skip_nonspaces(start);
	100	**end = '\0';
	101	}
772030fe	102	*/
ba6459ba PMF	103
	104	int ltt_probe_register(struct ltt_available_probe *pdata)
	105	{
	106	int ret = 0;
	107	int comparison;
	108	struct ltt_available_probe *iter;
	109
f7b16408	110	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	111	list_for_each_entry_reverse(iter, &probes_registered_list, node) {
	112	comparison = strcmp(pdata->name, iter->name);
	113	if (!comparison) {
	114	ret = -EBUSY;
	115	goto end;
	116	} else if (comparison > 0) {
	117	/* We belong to the location right after iter. */
	118	list_add(&pdata->node, &iter->node);
	119	goto end;
	120	}
	121	}
	122	/* Should be added at the head of the list */
	123	list_add(&pdata->node, &probes_registered_list);
	124	end:
f7b16408	125	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	126	return ret;
ba6459ba PMF	127	}
ba6459ba PMF	128
	129	/*
	130	* Called when a probe does not want to be called anymore.
	131	*/
	132	int ltt_probe_unregister(struct ltt_available_probe *pdata)
	133	{
	134	int ret = 0;
	135	struct ltt_active_marker amark, tmp;
	136
f7b16408	137	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	138	list_for_each_entry_safe(amark, tmp, &markers_loaded_list, node) {
	139	if (amark->probe == pdata) {
	140	ret = marker_probe_unregister_private_data(
	141	pdata->probe_func, amark);
	142	if (ret)
	143	goto end;
	144	list_del(&amark->node);
	145	free(amark);
	146	}
	147	}
	148	list_del(&pdata->node);
	149	end:
f7b16408	150	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	151	return ret;
ba6459ba PMF	152	}
ba6459ba PMF	153
	154	/*
	155	* Connect marker "mname" to probe "pname".
	156	* Only allow _only_ probe instance to be connected to a marker.
	157	*/
	158	int ltt_marker_connect(const char channel, const char mname,
	159	const char *pname)
	160
	161	{
	162	int ret;
	163	struct ltt_active_marker *pdata;
	164	struct ltt_available_probe *probe;
	165
	166	ltt_lock_traces();
f7b16408	167	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	168	probe = get_probe_from_name(pname);
	169	if (!probe) {
	170	ret = -ENOENT;
	171	goto end;
	172	}
	173	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	174	if (pdata && !IS_ERR(pdata)) {
	175	ret = -EEXIST;
	176	goto end;
	177	}
	178	pdata = zmalloc(sizeof(struct ltt_active_marker));
	179	if (!pdata) {
	180	ret = -ENOMEM;
	181	goto end;
	182	}
	183	pdata->probe = probe;
	184	/*
	185	* ID has priority over channel in case of conflict.
	186	*/
	187	ret = marker_probe_register(channel, mname, NULL,
	188	probe->probe_func, pdata);
	189	if (ret)
	190	free(pdata);
	191	else
	192	list_add(&pdata->node, &markers_loaded_list);
	193	end:
f7b16408	194	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	195	ltt_unlock_traces();
	196	return ret;
	197	}
ba6459ba PMF	198
	199	/*
	200	* Disconnect marker "mname", probe "pname".
	201	*/
	202	int ltt_marker_disconnect(const char channel, const char mname,
	203	const char *pname)
	204	{
	205	struct ltt_active_marker *pdata;
	206	struct ltt_available_probe *probe;
	207	int ret = 0;
	208
f7b16408	209	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	210	probe = get_probe_from_name(pname);
	211	if (!probe) {
	212	ret = -ENOENT;
	213	goto end;
	214	}
	215	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	216	if (IS_ERR(pdata)) {
	217	ret = PTR_ERR(pdata);
	218	goto end;
	219	} else if (!pdata) {
	220	/*
	221	* Not registered by us.
	222	*/
	223	ret = -EPERM;
	224	goto end;
	225	}
	226	ret = marker_probe_unregister(channel, mname, probe->probe_func, pdata);
	227	if (ret)
	228	goto end;
	229	else {
	230	list_del(&pdata->node);
	231	free(pdata);
	232	}
	233	end:
f7b16408	234	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	235	return ret;
ba6459ba PMF	236	}
ba6459ba PMF	237
	238	/*
	239	* function handling proc entry write.
	240	*
	241	* connect <channel name> <marker name> [<probe name>]]
	242	* disconnect <channel name> <marker name> [<probe name>]
	243	*/
	244	//ust// static ssize_t ltt_write(struct file file, const char __user buffer,
	245	//ust// size_t count, loff_t *offset)
	246	//ust// {
	247	//ust// char *kbuf;
	248	//ust// char iter, marker_action, *arg[4];
	249	//ust// ssize_t ret;
	250	//ust// int i;
	251	//ust//
	252	//ust// if (!count)
	253	//ust// return -EINVAL;
	254	//ust//
	255	//ust// kbuf = vmalloc(count + 1);
	256	//ust// kbuf[count] = '\0'; /* Transform into a string */
	257	//ust// ret = copy_from_user(kbuf, buffer, count);
	258	//ust// if (ret) {
	259	//ust// ret = -EINVAL;
	260	//ust// goto end;
	261	//ust// }
	262	//ust// get_marker_string(kbuf, &marker_action, &iter);
	263	//ust// if (!marker_action \|\| marker_action == iter) {
	264	//ust// ret = -EINVAL;
	265	//ust// goto end;
	266	//ust// }
	267	//ust// for (i = 0; i < 4; i++) {
	268	//ust// arg[i] = NULL;
	269	//ust// if (iter < kbuf + count) {
	270	//ust// iter++; /* skip the added '\0' */
	271	//ust// get_marker_string(iter, &arg[i], &iter);
	272	//ust// if (arg[i] == iter)
	273	//ust// arg[i] = NULL;
	274	//ust// }
	275	//ust// }
	276	//ust//
	277	//ust// if (!arg[0] \|\| !arg[1]) {
	278	//ust// ret = -EINVAL;
	279	//ust// goto end;
	280	//ust// }
	281	//ust//
	282	//ust// if (!strcmp(marker_action, "connect")) {
	283	//ust// ret = ltt_marker_connect(arg[0], arg[1], arg[2]);
	284	//ust// if (ret)
	285	//ust// goto end;
	286	//ust// } else if (!strcmp(marker_action, "disconnect")) {
	287	//ust// ret = ltt_marker_disconnect(arg[0], arg[1], arg[2]);
	288	//ust// if (ret)
	289	//ust// goto end;
	290	//ust// }
	291	//ust// ret = count;
	292	//ust// end:
	293	//ust// vfree(kbuf);
	294	//ust// return ret;
	295	//ust// }
	296	//ust//
	297	//ust// static void s_next(struct seq_file m, void p, loff_t pos)
	298	//ust// {
	299	//ust// struct marker_iter *iter = m->private;
	300	//ust//
301	//ust// marker_iter_next(iter);
302	//ust// if (!iter->marker) {
303	//ust// /*
304	//ust// * Setting the iter module to -1UL will make sure
305	//ust// * that no module can possibly hold the current marker.
306	//ust// */
307	//ust// iter->module = (void *)-1UL;
308	//ust// return NULL;
309	//ust// }
310	//ust// return iter->marker;
311	//ust// }
312	//ust//
313	//ust// static void s_start(struct seq_file m, loff_t *pos)
314	//ust// {
315	//ust// struct marker_iter *iter = m->private;
316	//ust//
317	//ust// if (!*pos)
318	//ust// marker_iter_reset(iter);
319	//ust// marker_iter_start(iter);
320	//ust// if (!iter->marker) {
321	//ust// /*
322	//ust// * Setting the iter module to -1UL will make sure
323	//ust// * that no module can possibly hold the current marker.
324	//ust// */
325	//ust// iter->module = (void *)-1UL;
326	//ust// return NULL;
327	//ust// }
328	//ust// return iter->marker;
329	//ust// }
330	//ust//
331	//ust// static void s_stop(struct seq_file m, void p)
332	//ust// {
333	//ust// marker_iter_stop(m->private);
334	//ust// }
335	//ust//
336	//ust// static int s_show(struct seq_file m, void p)
337	//ust// {
338	//ust// struct marker_iter *iter = m->private;
339	//ust//
340	//ust// seq_printf(m, "channel: %s marker: %s format: \"%s\" state: %d "
341	//ust// "event_id: %hu call: 0x%p probe %s : 0x%p\n",
342	//ust// iter->marker->channel,
343	//ust// iter->marker->name, iter->marker->format,
344	//ust// _imv_read(iter->marker->state),
345	//ust// iter->marker->event_id,
346	//ust// iter->marker->call,
347	//ust// iter->marker->ptype ? "multi" : "single",
348	//ust// iter->marker->ptype ?
349	//ust// (void)iter->marker->multi : (void)iter->marker->single.func);
350	//ust// return 0;
351	//ust// }
352	//ust//
353	//ust// static const struct seq_operations ltt_seq_op = {
354	//ust// .start = s_start,
355	//ust// .next = s_next,
356	//ust// .stop = s_stop,
357	//ust// .show = s_show,
358	//ust// };
359	//ust//
360	//ust// static int ltt_open(struct inode inode, struct file file)
361	//ust// {
362	//ust// /*
363	//ust// * Iterator kept in m->private.
364	//ust// * Restart iteration on all modules between reads because we do not lock
365	//ust// * the module mutex between those.
366	//ust// */
367	//ust// int ret;
368	//ust// struct marker_iter *iter;
369	//ust//
370	//ust// iter = kzalloc(sizeof(*iter), GFP_KERNEL);
371	//ust// if (!iter)
372	//ust// return -ENOMEM;
373	//ust//
374	//ust// ret = seq_open(file, &ltt_seq_op);
375	//ust// if (ret == 0)
376	//ust// ((struct seq_file *)file->private_data)->private = iter;
377	//ust// else
378	//ust// kfree(iter);
379	//ust// return ret;
380	//ust// }
381	//ust//
382	//ust// static struct file_operations ltt_fops = {
383	//ust// .write = ltt_write,
384	//ust// .open = ltt_open,
385	//ust// .read = seq_read,
386	//ust// .llseek = seq_lseek,
387	//ust// .release = seq_release_private,
388	//ust// };
389
390	static void disconnect_all_markers(void)
391	{
392	struct ltt_active_marker pdata, tmp;
393
394	list_for_each_entry_safe(pdata, tmp, &markers_loaded_list, node) {
395	marker_probe_unregister_private_data(pdata->probe->probe_func,
396	pdata);
397	list_del(&pdata->node);
398	free(pdata);
399	}
400	}
401
4db647c5 PMF	402	static char initialized = 0;
	403
	404	void __attribute__((constructor)) init_marker_control(void)
ba6459ba	405	{
4db647c5 PMF	406	if(!initialized) {
4db647c5 PMF	407	int ret;
ba6459ba PMF	408
	409	//ust// pentry = create_proc_entry("ltt", S_IRUSR\|S_IWUSR, NULL);
	410	//ust// if (!pentry)
	411	//ust// return -EBUSY;
	412	//ust// markers_loaded_cachep = KMEM_CACHE(ltt_active_marker, 0);
	413
4db647c5 PMF	414	ret = ltt_probe_register(&default_probe);
	415	BUG_ON(ret);
	416	ret = ltt_marker_connect("metadata", "core_marker_format",
	417	DEFAULT_PROBE);
	418	BUG_ON(ret);
	419	ret = ltt_marker_connect("metadata", "core_marker_id", DEFAULT_PROBE);
	420	BUG_ON(ret);
ba6459ba PMF	421	//ust// pentry->proc_fops = &ltt_fops;
ba6459ba PMF	422
4db647c5 PMF	423	initialized = 1;
4db647c5 PMF	424	}
ba6459ba PMF	425	}
	426	//ust// module_init(marker_control_init);
	427
772030fe	428	static void __attribute__((destructor)) marker_control_exit(void)
ba6459ba PMF	429	{
	430	int ret;
	431
	432	//ust// remove_proc_entry("ltt", NULL);
	433	ret = ltt_marker_disconnect("metadata", "core_marker_format",
	434	DEFAULT_PROBE);
	435	BUG_ON(ret);
	436	ret = ltt_marker_disconnect("metadata", "core_marker_id",
	437	DEFAULT_PROBE);
	438	BUG_ON(ret);
	439	ret = ltt_probe_unregister(&default_probe);
	440	BUG_ON(ret);
	441	disconnect_all_markers();
	442	//ust// kmem_cache_destroy(markers_loaded_cachep);
	443	//ust// marker_synchronize_unregister();
	444	}
	445	//ust// module_exit(marker_control_exit);
	446
	447	//ust// MODULE_LICENSE("GPL");
	448	//ust// MODULE_AUTHOR("Mathieu Desnoyers");
	449	//ust// MODULE_DESCRIPTION("Linux Trace Toolkit Marker Control");