[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
 *
 * LTT marker control module over /proc
 */

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

#include <ust/kernelcompat.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;

	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:
	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;

	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:
	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();
	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:
	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;

	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:
	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 PMF	17	*
	18	* LTT marker control module over /proc
	19	*/
	20
772030fe	21	#include <ctype.h>
909bc43f	22	#include <stdlib.h>
772030fe	23
fbca6b62	24	#include <ust/kernelcompat.h>
c93858f1	25	#include "tracer.h"
6af64c43	26	#include "usterr.h"
ba6459ba PMF	27
	28	#define DEFAULT_CHANNEL "cpu"
	29	#define DEFAULT_PROBE "default"
	30
	31	LIST_HEAD(probes_list);
	32
	33	/*
	34	* Mutex protecting the probe slab cache.
	35	* Nests inside the traces mutex.
	36	*/
	37	DEFINE_MUTEX(probes_mutex);
	38
	39	struct ltt_available_probe default_probe = {
	40	.name = "default",
	41	.format = NULL,
	42	.probe_func = ltt_vtrace,
	43	.callbacks[0] = ltt_serialize_data,
	44	};
	45
	46	//ust//static struct kmem_cache *markers_loaded_cachep;
	47	static LIST_HEAD(markers_loaded_list);
	48	/*
	49	* List sorted by name strcmp order.
	50	*/
	51	static LIST_HEAD(probes_registered_list);
	52
	53	//ust// static struct proc_dir_entry *pentry;
	54
	55	//ust// static struct file_operations ltt_fops;
	56
	57	static struct ltt_available_probe get_probe_from_name(const char pname)
	58	{
	59	struct ltt_available_probe *iter;
	60	int comparison, found = 0;
	61
	62	if (!pname)
	63	pname = DEFAULT_PROBE;
	64	list_for_each_entry(iter, &probes_registered_list, node) {
	65	comparison = strcmp(pname, iter->name);
	66	if (!comparison)
	67	found = 1;
	68	if (comparison <= 0)
	69	break;
	70	}
	71	if (found)
	72	return iter;
	73	else
	74	return NULL;
	75	}
	76
772030fe	77	/* (unused)
ba6459ba PMF	78	static char skip_spaces(char buf)
	79	{
	80	while (buf != '\0' && isspace(buf))
	81	buf++;
	82	return buf;
	83	}
	84
	85	static char skip_nonspaces(char buf)
	86	{
	87	while (buf != '\0' && !isspace(buf))
	88	buf++;
	89	return buf;
	90	}
	91
	92	static void get_marker_string(char buf, char *start,
	93	char **end)
	94	{
	95	*start = skip_spaces(buf);
	96	end = skip_nonspaces(start);
	97	**end = '\0';
	98	}
772030fe	99	*/
ba6459ba PMF	100
	101	int ltt_probe_register(struct ltt_available_probe *pdata)
	102	{
	103	int ret = 0;
	104	int comparison;
	105	struct ltt_available_probe *iter;
	106
	107	mutex_lock(&probes_mutex);
	108	list_for_each_entry_reverse(iter, &probes_registered_list, node) {
	109	comparison = strcmp(pdata->name, iter->name);
	110	if (!comparison) {
	111	ret = -EBUSY;
	112	goto end;
	113	} else if (comparison > 0) {
	114	/* We belong to the location right after iter. */
	115	list_add(&pdata->node, &iter->node);
	116	goto end;
	117	}
	118	}
	119	/* Should be added at the head of the list */
	120	list_add(&pdata->node, &probes_registered_list);
	121	end:
	122	mutex_unlock(&probes_mutex);
	123	return ret;
	124	}
ba6459ba PMF	125
	126	/*
	127	* Called when a probe does not want to be called anymore.
	128	*/
	129	int ltt_probe_unregister(struct ltt_available_probe *pdata)
	130	{
	131	int ret = 0;
	132	struct ltt_active_marker amark, tmp;
	133
	134	mutex_lock(&probes_mutex);
	135	list_for_each_entry_safe(amark, tmp, &markers_loaded_list, node) {
	136	if (amark->probe == pdata) {
	137	ret = marker_probe_unregister_private_data(
	138	pdata->probe_func, amark);
	139	if (ret)
	140	goto end;
	141	list_del(&amark->node);
	142	free(amark);
	143	}
	144	}
	145	list_del(&pdata->node);
	146	end:
	147	mutex_unlock(&probes_mutex);
	148	return ret;
	149	}
ba6459ba PMF	150
	151	/*
	152	* Connect marker "mname" to probe "pname".
	153	* Only allow _only_ probe instance to be connected to a marker.
	154	*/
	155	int ltt_marker_connect(const char channel, const char mname,
	156	const char *pname)
	157
	158	{
	159	int ret;
	160	struct ltt_active_marker *pdata;
	161	struct ltt_available_probe *probe;
	162
	163	ltt_lock_traces();
	164	mutex_lock(&probes_mutex);
	165	probe = get_probe_from_name(pname);
	166	if (!probe) {
	167	ret = -ENOENT;
	168	goto end;
	169	}
	170	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	171	if (pdata && !IS_ERR(pdata)) {
	172	ret = -EEXIST;
	173	goto end;
	174	}
	175	pdata = zmalloc(sizeof(struct ltt_active_marker));
	176	if (!pdata) {
	177	ret = -ENOMEM;
	178	goto end;
	179	}
	180	pdata->probe = probe;
	181	/*
	182	* ID has priority over channel in case of conflict.
	183	*/
	184	ret = marker_probe_register(channel, mname, NULL,
	185	probe->probe_func, pdata);
	186	if (ret)
	187	free(pdata);
	188	else
	189	list_add(&pdata->node, &markers_loaded_list);
	190	end:
	191	mutex_unlock(&probes_mutex);
	192	ltt_unlock_traces();
	193	return ret;
	194	}
ba6459ba PMF	195
	196	/*
	197	* Disconnect marker "mname", probe "pname".
	198	*/
	199	int ltt_marker_disconnect(const char channel, const char mname,
	200	const char *pname)
	201	{
	202	struct ltt_active_marker *pdata;
	203	struct ltt_available_probe *probe;
	204	int ret = 0;
	205
	206	mutex_lock(&probes_mutex);
	207	probe = get_probe_from_name(pname);
	208	if (!probe) {
	209	ret = -ENOENT;
	210	goto end;
	211	}
	212	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	213	if (IS_ERR(pdata)) {
	214	ret = PTR_ERR(pdata);
	215	goto end;
	216	} else if (!pdata) {
	217	/*
	218	* Not registered by us.
	219	*/
	220	ret = -EPERM;
	221	goto end;
	222	}
	223	ret = marker_probe_unregister(channel, mname, probe->probe_func, pdata);
	224	if (ret)
	225	goto end;
	226	else {
	227	list_del(&pdata->node);
	228	free(pdata);
	229	}
	230	end:
	231	mutex_unlock(&probes_mutex);
	232	return ret;
	233	}
ba6459ba PMF	234
	235	/*
	236	* function handling proc entry write.
	237	*
	238	* connect <channel name> <marker name> [<probe name>]]
	239	* disconnect <channel name> <marker name> [<probe name>]
	240	*/
	241	//ust// static ssize_t ltt_write(struct file file, const char __user buffer,
	242	//ust// size_t count, loff_t *offset)
	243	//ust// {
	244	//ust// char *kbuf;
	245	//ust// char iter, marker_action, *arg[4];
	246	//ust// ssize_t ret;
	247	//ust// int i;
	248	//ust//
	249	//ust// if (!count)
	250	//ust// return -EINVAL;
	251	//ust//
	252	//ust// kbuf = vmalloc(count + 1);
	253	//ust// kbuf[count] = '\0'; /* Transform into a string */
	254	//ust// ret = copy_from_user(kbuf, buffer, count);
	255	//ust// if (ret) {
	256	//ust// ret = -EINVAL;
	257	//ust// goto end;
	258	//ust// }
	259	//ust// get_marker_string(kbuf, &marker_action, &iter);
	260	//ust// if (!marker_action \|\| marker_action == iter) {
	261	//ust// ret = -EINVAL;
	262	//ust// goto end;
	263	//ust// }
	264	//ust// for (i = 0; i < 4; i++) {
	265	//ust// arg[i] = NULL;
	266	//ust// if (iter < kbuf + count) {
	267	//ust// iter++; /* skip the added '\0' */
	268	//ust// get_marker_string(iter, &arg[i], &iter);
	269	//ust// if (arg[i] == iter)
	270	//ust// arg[i] = NULL;
	271	//ust// }
	272	//ust// }
	273	//ust//
	274	//ust// if (!arg[0] \|\| !arg[1]) {
	275	//ust// ret = -EINVAL;
	276	//ust// goto end;
	277	//ust// }
	278	//ust//
	279	//ust// if (!strcmp(marker_action, "connect")) {
	280	//ust// ret = ltt_marker_connect(arg[0], arg[1], arg[2]);
	281	//ust// if (ret)
	282	//ust// goto end;
	283	//ust// } else if (!strcmp(marker_action, "disconnect")) {
	284	//ust// ret = ltt_marker_disconnect(arg[0], arg[1], arg[2]);
	285	//ust// if (ret)
	286	//ust// goto end;
	287	//ust// }
	288	//ust// ret = count;
	289	//ust// end:
	290	//ust// vfree(kbuf);
	291	//ust// return ret;
	292	//ust// }
	293	//ust//
	294	//ust// static void s_next(struct seq_file m, void p, loff_t pos)
	295	//ust// {
	296	//ust// struct marker_iter *iter = m->private;
	297	//ust//
298	//ust// marker_iter_next(iter);
299	//ust// if (!iter->marker) {
300	//ust// /*
301	//ust// * Setting the iter module to -1UL will make sure
302	//ust// * that no module can possibly hold the current marker.
303	//ust// */
304	//ust// iter->module = (void *)-1UL;
305	//ust// return NULL;
306	//ust// }
307	//ust// return iter->marker;
308	//ust// }
309	//ust//
310	//ust// static void s_start(struct seq_file m, loff_t *pos)
311	//ust// {
312	//ust// struct marker_iter *iter = m->private;
313	//ust//
314	//ust// if (!*pos)
315	//ust// marker_iter_reset(iter);
316	//ust// marker_iter_start(iter);
317	//ust// if (!iter->marker) {
318	//ust// /*
319	//ust// * Setting the iter module to -1UL will make sure
320	//ust// * that no module can possibly hold the current marker.
321	//ust// */
322	//ust// iter->module = (void *)-1UL;
323	//ust// return NULL;
324	//ust// }
325	//ust// return iter->marker;
326	//ust// }
327	//ust//
328	//ust// static void s_stop(struct seq_file m, void p)
329	//ust// {
330	//ust// marker_iter_stop(m->private);
331	//ust// }
332	//ust//
333	//ust// static int s_show(struct seq_file m, void p)
334	//ust// {
335	//ust// struct marker_iter *iter = m->private;
336	//ust//
337	//ust// seq_printf(m, "channel: %s marker: %s format: \"%s\" state: %d "
338	//ust// "event_id: %hu call: 0x%p probe %s : 0x%p\n",
339	//ust// iter->marker->channel,
340	//ust// iter->marker->name, iter->marker->format,
341	//ust// _imv_read(iter->marker->state),
342	//ust// iter->marker->event_id,
343	//ust// iter->marker->call,
344	//ust// iter->marker->ptype ? "multi" : "single",
345	//ust// iter->marker->ptype ?
346	//ust// (void)iter->marker->multi : (void)iter->marker->single.func);
347	//ust// return 0;
348	//ust// }
349	//ust//
350	//ust// static const struct seq_operations ltt_seq_op = {
351	//ust// .start = s_start,
352	//ust// .next = s_next,
353	//ust// .stop = s_stop,
354	//ust// .show = s_show,
355	//ust// };
356	//ust//
357	//ust// static int ltt_open(struct inode inode, struct file file)
358	//ust// {
359	//ust// /*
360	//ust// * Iterator kept in m->private.
361	//ust// * Restart iteration on all modules between reads because we do not lock
362	//ust// * the module mutex between those.
363	//ust// */
364	//ust// int ret;
365	//ust// struct marker_iter *iter;
366	//ust//
367	//ust// iter = kzalloc(sizeof(*iter), GFP_KERNEL);
368	//ust// if (!iter)
369	//ust// return -ENOMEM;
370	//ust//
371	//ust// ret = seq_open(file, &ltt_seq_op);
372	//ust// if (ret == 0)
373	//ust// ((struct seq_file *)file->private_data)->private = iter;
374	//ust// else
375	//ust// kfree(iter);
376	//ust// return ret;
377	//ust// }
378	//ust//
379	//ust// static struct file_operations ltt_fops = {
380	//ust// .write = ltt_write,
381	//ust// .open = ltt_open,
382	//ust// .read = seq_read,
383	//ust// .llseek = seq_lseek,
384	//ust// .release = seq_release_private,
385	//ust// };
386
387	static void disconnect_all_markers(void)
388	{
389	struct ltt_active_marker pdata, tmp;
390
391	list_for_each_entry_safe(pdata, tmp, &markers_loaded_list, node) {
392	marker_probe_unregister_private_data(pdata->probe->probe_func,
393	pdata);
394	list_del(&pdata->node);
395	free(pdata);
396	}
397	}
398
4db647c5 PMF	399	static char initialized = 0;
	400
	401	void __attribute__((constructor)) init_marker_control(void)
ba6459ba	402	{
4db647c5 PMF	403	if(!initialized) {
4db647c5 PMF	404	int ret;
ba6459ba PMF	405
	406	//ust// pentry = create_proc_entry("ltt", S_IRUSR\|S_IWUSR, NULL);
	407	//ust// if (!pentry)
	408	//ust// return -EBUSY;
	409	//ust// markers_loaded_cachep = KMEM_CACHE(ltt_active_marker, 0);
	410
4db647c5 PMF	411	ret = ltt_probe_register(&default_probe);
	412	BUG_ON(ret);
	413	ret = ltt_marker_connect("metadata", "core_marker_format",
	414	DEFAULT_PROBE);
	415	BUG_ON(ret);
	416	ret = ltt_marker_connect("metadata", "core_marker_id", DEFAULT_PROBE);
	417	BUG_ON(ret);
ba6459ba PMF	418	//ust// pentry->proc_fops = &ltt_fops;
ba6459ba PMF	419
4db647c5 PMF	420	initialized = 1;
4db647c5 PMF	421	}
ba6459ba PMF	422	}
	423	//ust// module_init(marker_control_init);
	424
772030fe	425	static void __attribute__((destructor)) marker_control_exit(void)
ba6459ba PMF	426	{
	427	int ret;
	428
	429	//ust// remove_proc_entry("ltt", NULL);
	430	ret = ltt_marker_disconnect("metadata", "core_marker_format",
	431	DEFAULT_PROBE);
	432	BUG_ON(ret);
	433	ret = ltt_marker_disconnect("metadata", "core_marker_id",
	434	DEFAULT_PROBE);
	435	BUG_ON(ret);
	436	ret = ltt_probe_unregister(&default_probe);
	437	BUG_ON(ret);
	438	disconnect_all_markers();
	439	//ust// kmem_cache_destroy(markers_loaded_cachep);
	440	//ust// marker_synchronize_unregister();
	441	}
	442	//ust// module_exit(marker_control_exit);
	443
	444	//ust// MODULE_LICENSE("GPL");
	445	//ust// MODULE_AUTHOR("Mathieu Desnoyers");
	446	//ust// MODULE_DESCRIPTION("Linux Trace Toolkit Marker Control");