[lttng-tools.git] / src / bin / lttng-sessiond / context.c

/*
 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#define _LGPL_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <urcu/list.h>

#include <common/error.h>
#include <common/sessiond-comm/sessiond-comm.h>

#include "context.h"
#include "kernel.h"
#include "ust-app.h"
#include "trace-ust.h"
#include "agent.h"

/*
 * Add kernel context to all channel.
 *
 * Assumes the ownership of kctx.
 */
static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
		struct ltt_kernel_context *kctx)
{
	int ret;
	struct ltt_kernel_channel *kchan;

	assert(ksession);
	assert(kctx);

	DBG("Adding kernel context to all channels");

	/* Go over all channels */
	cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
		struct ltt_kernel_context *kctx_copy;

		kctx_copy = trace_kernel_copy_context(kctx);
		if (!kctx_copy) {
			PERROR("zmalloc ltt_kernel_context");
			ret = -LTTNG_ERR_NOMEM;
			goto error;
		}

		/* Ownership of kctx_copy is transferred to the callee. */
		ret = kernel_add_channel_context(kchan, kctx_copy);
		kctx_copy = NULL;
		if (ret != 0) {
			goto error;
		}
	}

	ret = LTTNG_OK;

error:
	trace_kernel_destroy_context(kctx);
	return ret;
}

/*
 * Add kernel context to a specific channel.
 *
 * Assumes the ownership of kctx.
 */
static int add_kctx_to_channel(struct ltt_kernel_context *kctx,
		struct ltt_kernel_channel *kchan)
{
	int ret;

	assert(kchan);
	assert(kctx);

	DBG("Add kernel context to channel '%s'", kchan->channel->name);

	/* Ownership of kctx is transferred to the callee. */
	ret = kernel_add_channel_context(kchan, kctx);
	kctx = NULL;
	if (ret != 0) {
		goto error;
	}

	ret = LTTNG_OK;

error:
	return ret;
}

/*
 * Add UST context to channel.
 */
static int add_uctx_to_channel(struct ltt_ust_session *usess,
		enum lttng_domain_type domain,
		struct ltt_ust_channel *uchan,
		const struct lttng_event_context *ctx)
{
	int ret;
	struct ltt_ust_context *uctx = NULL;

	assert(usess);
	assert(uchan);
	assert(ctx);

	/* Check if context is duplicate */
	cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
		if (trace_ust_match_context(uctx, ctx)) {
			ret = LTTNG_ERR_UST_CONTEXT_EXIST;
			goto duplicate;
		}
	}
	uctx = NULL;

	switch (domain) {
	case LTTNG_DOMAIN_JUL:
	case LTTNG_DOMAIN_LOG4J:
	{
		struct agent *agt;

		if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
			/* Other contexts are not needed by the agent. */
			break;
		}
		agt = trace_ust_find_agent(usess, domain);

		if (!agt) {
			agt = agent_create(domain);
			if (!agt) {
				ret = -LTTNG_ERR_NOMEM;
				goto error;
			}
			agent_add(agt, usess->agents);
		}
		ret = agent_add_context(ctx, agt);
		if (ret != LTTNG_OK) {
			goto error;
		}

		ret = agent_enable_context(ctx, domain);
		if (ret != LTTNG_OK) {
			goto error;
		}
		break;
	}
	case LTTNG_DOMAIN_UST:
		break;
	default:
		assert(0);
	}

	/* Create ltt UST context */
	uctx = trace_ust_create_context(ctx);
	if (uctx == NULL) {
		ret = LTTNG_ERR_UST_CONTEXT_INVAL;
		goto error;
	}

	/* Add ltt UST context node to ltt UST channel */
	lttng_ht_add_ulong(uchan->ctx, &uctx->node);
	cds_list_add_tail(&uctx->list, &uchan->ctx_list);

	if (!usess->active) {
		goto end;
	}

	ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
	if (ret < 0) {
		goto error;
	}
end:
	DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);

	return 0;

error:
	free(uctx);
duplicate:
	return ret;
}

/*
 * Add kernel context to tracer.
 */
int context_kernel_add(struct ltt_kernel_session *ksession,
		const struct lttng_event_context *ctx, char *channel_name)
{
	int ret;
	struct ltt_kernel_channel *kchan;
	struct ltt_kernel_context *kctx;

	assert(ksession);
	assert(ctx);
	assert(channel_name);

	kctx = trace_kernel_create_context(NULL);
	if (!kctx) {
		ret = -LTTNG_ERR_NOMEM;
		goto error;
	}

	/* Setup kernel context structure */
	switch (ctx->ctx) {
	case LTTNG_EVENT_CONTEXT_PID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
		break;
	case LTTNG_EVENT_CONTEXT_PROCNAME:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
		break;
	case LTTNG_EVENT_CONTEXT_PRIO:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
		break;
	case LTTNG_EVENT_CONTEXT_NICE:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
		break;
	case LTTNG_EVENT_CONTEXT_VPID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
		break;
	case LTTNG_EVENT_CONTEXT_TID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
		break;
	case LTTNG_EVENT_CONTEXT_VTID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
		break;
	case LTTNG_EVENT_CONTEXT_PPID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
		break;
	case LTTNG_EVENT_CONTEXT_VPPID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
		break;
	case LTTNG_EVENT_CONTEXT_HOSTNAME:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
		break;
	case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
	case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
		break;
	case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE;
		break;
	case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PREEMPTIBLE;
		break;
	case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE;
		break;
	case LTTNG_EVENT_CONTEXT_MIGRATABLE:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_MIGRATABLE;
		break;
	case LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL;
		break;
	case LTTNG_EVENT_CONTEXT_CALLSTACK_USER:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CALLSTACK_USER;
		break;
	case LTTNG_EVENT_CONTEXT_CGROUP_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CGROUP_NS;
		break;
	case LTTNG_EVENT_CONTEXT_IPC_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_IPC_NS;
		break;
	case LTTNG_EVENT_CONTEXT_MNT_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_MNT_NS;
		break;
	case LTTNG_EVENT_CONTEXT_NET_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NET_NS;
		break;
	case LTTNG_EVENT_CONTEXT_PID_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID_NS;
		break;
	case LTTNG_EVENT_CONTEXT_TIME_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TIME_NS;
		break;
	case LTTNG_EVENT_CONTEXT_USER_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_USER_NS;
		break;
	case LTTNG_EVENT_CONTEXT_UTS_NS:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_UTS_NS;
		break;
	case LTTNG_EVENT_CONTEXT_UID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_UID;
		break;
	case LTTNG_EVENT_CONTEXT_EUID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_EUID;
		break;
	case LTTNG_EVENT_CONTEXT_SUID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_SUID;
		break;
	case LTTNG_EVENT_CONTEXT_GID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_GID;
		break;
	case LTTNG_EVENT_CONTEXT_EGID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_EGID;
		break;
	case LTTNG_EVENT_CONTEXT_SGID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_SGID;
		break;
	case LTTNG_EVENT_CONTEXT_VUID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VUID;
		break;
	case LTTNG_EVENT_CONTEXT_VEUID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VEUID;
		break;
	case LTTNG_EVENT_CONTEXT_VSUID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VSUID;
		break;
	case LTTNG_EVENT_CONTEXT_VGID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VGID;
		break;
	case LTTNG_EVENT_CONTEXT_VEGID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VEGID;
		break;
	case LTTNG_EVENT_CONTEXT_VSGID:
		kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VSGID;
		break;
	default:
		ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
		goto error;
	}

	kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
	kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
	strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
			LTTNG_SYMBOL_NAME_LEN);
	kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';

	if (*channel_name == '\0') {
		ret = add_kctx_all_channels(ksession, kctx);
		/* Ownership of kctx is transferred to the callee. */
		kctx = NULL;
		if (ret != LTTNG_OK) {
			goto error;
		}
	} else {
		/* Get kernel channel */
		kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
		if (kchan == NULL) {
			ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
			goto error;
		}

		ret = add_kctx_to_channel(kctx, kchan);
		/* Ownership of kctx is transferred to the callee. */
		kctx = NULL;
		if (ret != LTTNG_OK) {
			goto error;
		}
	}

	ret = LTTNG_OK;

error:
	if (kctx) {
		trace_kernel_destroy_context(kctx);
	}
	return ret;
}

/*
 * Add UST context to tracer.
 */
int context_ust_add(struct ltt_ust_session *usess,
		enum lttng_domain_type domain,
		const struct lttng_event_context *ctx,
		char *channel_name)
{
	int ret = LTTNG_OK;
	struct lttng_ht_iter iter;
	struct lttng_ht *chan_ht;
	struct ltt_ust_channel *uchan = NULL;

	assert(usess);
	assert(ctx);
	assert(channel_name);

	rcu_read_lock();

	chan_ht = usess->domain_global.channels;

	/* Get UST channel if defined */
	if (channel_name[0] != '\0') {
		uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
		if (uchan == NULL) {
			ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
			goto error;
		}
	}

	if (uchan) {
		/* Add ctx to channel */
		ret = add_uctx_to_channel(usess, domain, uchan, ctx);
	} else {
		rcu_read_lock();
		/* Add ctx all events, all channels */
		cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
			ret = add_uctx_to_channel(usess, domain, uchan, ctx);
			if (ret) {
				ERR("Failed to add context to channel %s",
						uchan->name);
				continue;
			}
		}
		rcu_read_unlock();
	}

	switch (ret) {
	case LTTNG_ERR_UST_CONTEXT_EXIST:
		break;
	case -ENOMEM:
	case -LTTNG_ERR_NOMEM:
		ret = LTTNG_ERR_FATAL;
		break;
	case -EINVAL:
		ret = LTTNG_ERR_UST_CONTEXT_INVAL;
		break;
	case -ENOSYS:
		ret = LTTNG_ERR_UNKNOWN_DOMAIN;
		break;
	default:
		if (ret != 0 && ret != LTTNG_OK) {
			ret = ret > 0 ? ret : LTTNG_ERR_UNK;
		} else {
			ret = LTTNG_OK;
		}
		break;
	}

error:
	rcu_read_unlock();
	return ret;
}
Commit	Line	Data
b579acd9	1	/*
ab5be9fa MJ	2	* Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
ab5be9fa MJ	3	* Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
b579acd9	4	*
ab5be9fa	5	* SPDX-License-Identifier: GPL-2.0-only
b579acd9	6	*
b579acd9 DG	7	*/
b579acd9 DG	8
6c1c0768	9	#define _LGPL_SOURCE
b579acd9 DG	10	#include <stdio.h>
	11	#include <stdlib.h>
	12	#include <string.h>
	13	#include <unistd.h>
54d01ffb	14	#include <urcu/list.h>
1e307fab	15
db758600	16	#include <common/error.h>
10a8a223	17	#include <common/sessiond-comm/sessiond-comm.h>
b579acd9	18
b579acd9	19	#include "context.h"
4771f025	20	#include "kernel.h"
55cc08a6	21	#include "ust-app.h"
34378f76	22	#include "trace-ust.h"
bdf64013	23	#include "agent.h"
b579acd9	24
b579acd9 DG	25	/*
b579acd9 DG	26	* Add kernel context to all channel.
df3c77c8 JG	27	*
df3c77c8 JG	28	* Assumes the ownership of kctx.
b579acd9 DG	29	*/
b579acd9 DG	30	static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
645328ae	31	struct ltt_kernel_context *kctx)
b579acd9	32	{
601d5acf	33	int ret;
b579acd9 DG	34	struct ltt_kernel_channel *kchan;
b579acd9 DG	35
0525e9ae DG	36	assert(ksession);
	37	assert(kctx);
	38
601d5acf	39	DBG("Adding kernel context to all channels");
b579acd9 DG	40
	41	/* Go over all channels */
	42	cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
df3c77c8 JG	43	struct ltt_kernel_context *kctx_copy;
	44
	45	kctx_copy = trace_kernel_copy_context(kctx);
	46	if (!kctx_copy) {
	47	PERROR("zmalloc ltt_kernel_context");
7682f304	48	ret = -LTTNG_ERR_NOMEM;
df3c77c8 JG	49	goto error;
	50	}
	51
	52	/* Ownership of kctx_copy is transferred to the callee. */
	53	ret = kernel_add_channel_context(kchan, kctx_copy);
	54	kctx_copy = NULL;
1ae5e83e	55	if (ret != 0) {
601d5acf	56	goto error;
b579acd9 DG	57	}
	58	}
	59
f73fabfd	60	ret = LTTNG_OK;
b579acd9 DG	61
b579acd9 DG	62	error:
df3c77c8	63	trace_kernel_destroy_context(kctx);
b579acd9 DG	64	return ret;
	65	}
	66
	67	/*
	68	* Add kernel context to a specific channel.
df3c77c8 JG	69	*
df3c77c8 JG	70	* Assumes the ownership of kctx.
b579acd9	71	*/
645328ae	72	static int add_kctx_to_channel(struct ltt_kernel_context *kctx,
601d5acf	73	struct ltt_kernel_channel *kchan)
b579acd9	74	{
601d5acf	75	int ret;
b579acd9	76
0525e9ae DG	77	assert(kchan);
	78	assert(kctx);
	79
601d5acf	80	DBG("Add kernel context to channel '%s'", kchan->channel->name);
b579acd9	81
df3c77c8	82	/* Ownership of kctx is transferred to the callee. */
601d5acf	83	ret = kernel_add_channel_context(kchan, kctx);
df3c77c8	84	kctx = NULL;
1ae5e83e	85	if (ret != 0) {
b579acd9 DG	86	goto error;
	87	}
	88
f73fabfd	89	ret = LTTNG_OK;
b579acd9 DG	90
	91	error:
	92	return ret;
	93	}
	94
6b79ed20 DG	95	/*
	96	* Add UST context to channel.
	97	*/
4ce7709b JG	98	static int add_uctx_to_channel(struct ltt_ust_session *usess,
4ce7709b JG	99	enum lttng_domain_type domain,
df4f5a87 JG	100	struct ltt_ust_channel *uchan,
df4f5a87 JG	101	const struct lttng_event_context *ctx)
6b79ed20 DG	102	{
6b79ed20 DG	103	int ret;
bdf64013	104	struct ltt_ust_context *uctx = NULL;
6b79ed20	105
0525e9ae DG	106	assert(usess);
	107	assert(uchan);
	108	assert(ctx);
	109
aa3514e9 MD	110	/* Check if context is duplicate */
	111	cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
	112	if (trace_ust_match_context(uctx, ctx)) {
7682f304	113	ret = LTTNG_ERR_UST_CONTEXT_EXIST;
aa3514e9 MD	114	goto duplicate;
	115	}
	116	}
bdf64013 JG	117	uctx = NULL;
	118
	119	switch (domain) {
	120	case LTTNG_DOMAIN_JUL:
	121	case LTTNG_DOMAIN_LOG4J:
	122	{
442f8c07 JG	123	struct agent *agt;
	124
	125	if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
	126	/* Other contexts are not needed by the agent. */
	127	break;
	128	}
	129	agt = trace_ust_find_agent(usess, domain);
bdf64013 JG	130
	131	if (!agt) {
	132	agt = agent_create(domain);
	133	if (!agt) {
7682f304	134	ret = -LTTNG_ERR_NOMEM;
bdf64013 JG	135	goto error;
	136	}
	137	agent_add(agt, usess->agents);
	138	}
	139	ret = agent_add_context(ctx, agt);
	140	if (ret != LTTNG_OK) {
	141	goto error;
	142	}
	143
	144	ret = agent_enable_context(ctx, domain);
	145	if (ret != LTTNG_OK) {
	146	goto error;
	147	}
	148	break;
	149	}
	150	case LTTNG_DOMAIN_UST:
	151	break;
	152	default:
	153	assert(0);
	154	}
aa3514e9	155
6b79ed20 DG	156	/* Create ltt UST context */
	157	uctx = trace_ust_create_context(ctx);
	158	if (uctx == NULL) {
7682f304	159	ret = LTTNG_ERR_UST_CONTEXT_INVAL;
6b79ed20 DG	160	goto error;
	161	}
	162
6b79ed20	163	/* Add ltt UST context node to ltt UST channel */
aa3514e9	164	lttng_ht_add_ulong(uchan->ctx, &uctx->node);
31746f93	165	cds_list_add_tail(&uctx->list, &uchan->ctx_list);
6b79ed20	166
88e3c2f5 JG	167	if (!usess->active) {
	168	goto end;
	169	}
	170
	171	ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
	172	if (ret < 0) {
	173	goto error;
	174	}
	175	end:
727d5404 DG	176	DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
	177
	178	return 0;
6b79ed20 DG	179
	180	error:
	181	free(uctx);
aa3514e9	182	duplicate:
6b79ed20 DG	183	return ret;
	184	}
	185
b579acd9 DG	186	/*
	187	* Add kernel context to tracer.
	188	*/
54d01ffb	189	int context_kernel_add(struct ltt_kernel_session *ksession,
df4f5a87	190	const struct lttng_event_context ctx, char channel_name)
b579acd9 DG	191	{
	192	int ret;
	193	struct ltt_kernel_channel *kchan;
645328ae	194	struct ltt_kernel_context *kctx;
54d01ffb	195
0525e9ae DG	196	assert(ksession);
	197	assert(ctx);
	198	assert(channel_name);
	199
645328ae DG	200	kctx = trace_kernel_create_context(NULL);
645328ae DG	201	if (!kctx) {
7682f304	202	ret = -LTTNG_ERR_NOMEM;
645328ae DG	203	goto error;
	204	}
	205
54d01ffb	206	/* Setup kernel context structure */
9197c5c4 MD	207	switch (ctx->ctx) {
9197c5c4 MD	208	case LTTNG_EVENT_CONTEXT_PID:
645328ae	209	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
9197c5c4	210	break;
9197c5c4	211	case LTTNG_EVENT_CONTEXT_PROCNAME:
645328ae	212	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
9197c5c4 MD	213	break;
9197c5c4 MD	214	case LTTNG_EVENT_CONTEXT_PRIO:
645328ae	215	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
9197c5c4 MD	216	break;
9197c5c4 MD	217	case LTTNG_EVENT_CONTEXT_NICE:
645328ae	218	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
9197c5c4 MD	219	break;
9197c5c4 MD	220	case LTTNG_EVENT_CONTEXT_VPID:
645328ae	221	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
9197c5c4 MD	222	break;
9197c5c4 MD	223	case LTTNG_EVENT_CONTEXT_TID:
645328ae	224	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
9197c5c4 MD	225	break;
9197c5c4 MD	226	case LTTNG_EVENT_CONTEXT_VTID:
645328ae	227	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
9197c5c4 MD	228	break;
9197c5c4 MD	229	case LTTNG_EVENT_CONTEXT_PPID:
645328ae	230	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
9197c5c4 MD	231	break;
9197c5c4 MD	232	case LTTNG_EVENT_CONTEXT_VPPID:
645328ae	233	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
9197c5c4	234	break;
54773d68	235	case LTTNG_EVENT_CONTEXT_HOSTNAME:
645328ae	236	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
54773d68	237	break;
aa3514e9 MD	238	case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
aa3514e9 MD	239	case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
645328ae	240	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
aa3514e9	241	break;
1ae5e83e JD	242	case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
	243	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE;
	244	break;
	245	case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
	246	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PREEMPTIBLE;
	247	break;
	248	case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
	249	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE;
	250	break;
	251	case LTTNG_EVENT_CONTEXT_MIGRATABLE:
	252	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_MIGRATABLE;
	253	break;
373148e9 FG	254	case LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL:
	255	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL;
	256	break;
	257	case LTTNG_EVENT_CONTEXT_CALLSTACK_USER:
	258	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CALLSTACK_USER;
	259	break;
40e14884 MJ	260	case LTTNG_EVENT_CONTEXT_CGROUP_NS:
	261	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CGROUP_NS;
	262	break;
	263	case LTTNG_EVENT_CONTEXT_IPC_NS:
	264	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_IPC_NS;
	265	break;
	266	case LTTNG_EVENT_CONTEXT_MNT_NS:
	267	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_MNT_NS;
	268	break;
	269	case LTTNG_EVENT_CONTEXT_NET_NS:
	270	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NET_NS;
	271	break;
	272	case LTTNG_EVENT_CONTEXT_PID_NS:
	273	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID_NS;
	274	break;
d37ac3cd MJ	275	case LTTNG_EVENT_CONTEXT_TIME_NS:
	276	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TIME_NS;
	277	break;
40e14884 MJ	278	case LTTNG_EVENT_CONTEXT_USER_NS:
	279	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_USER_NS;
	280	break;
	281	case LTTNG_EVENT_CONTEXT_UTS_NS:
	282	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_UTS_NS;
	283	break;
499cbfa1 MJ	284	case LTTNG_EVENT_CONTEXT_UID:
	285	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_UID;
	286	break;
	287	case LTTNG_EVENT_CONTEXT_EUID:
	288	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_EUID;
	289	break;
	290	case LTTNG_EVENT_CONTEXT_SUID:
	291	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_SUID;
	292	break;
	293	case LTTNG_EVENT_CONTEXT_GID:
	294	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_GID;
	295	break;
	296	case LTTNG_EVENT_CONTEXT_EGID:
	297	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_EGID;
	298	break;
	299	case LTTNG_EVENT_CONTEXT_SGID:
	300	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_SGID;
	301	break;
	302	case LTTNG_EVENT_CONTEXT_VUID:
	303	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VUID;
	304	break;
	305	case LTTNG_EVENT_CONTEXT_VEUID:
	306	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VEUID;
	307	break;
	308	case LTTNG_EVENT_CONTEXT_VSUID:
	309	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VSUID;
	310	break;
	311	case LTTNG_EVENT_CONTEXT_VGID:
	312	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VGID;
	313	break;
	314	case LTTNG_EVENT_CONTEXT_VEGID:
	315	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VEGID;
	316	break;
	317	case LTTNG_EVENT_CONTEXT_VSGID:
	318	kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VSGID;
	319	break;
9197c5c4	320	default:
fc7324e8 DG	321	ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
fc7324e8 DG	322	goto error;
9197c5c4 MD	323	}
9197c5c4 MD	324
645328ae DG	325	kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
	326	kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
	327	strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
54d01ffb	328	LTTNG_SYMBOL_NAME_LEN);
645328ae	329	kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
b579acd9	330
9d035200	331	if (*channel_name == '\0') {
645328ae	332	ret = add_kctx_all_channels(ksession, kctx);
df3c77c8 JG	333	/* Ownership of kctx is transferred to the callee. */
df3c77c8 JG	334	kctx = NULL;
f73fabfd	335	if (ret != LTTNG_OK) {
b579acd9 DG	336	goto error;
	337	}
	338	} else {
	339	/* Get kernel channel */
62499ad6	340	kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
b579acd9	341	if (kchan == NULL) {
f73fabfd	342	ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
b579acd9 DG	343	goto error;
	344	}
	345
645328ae	346	ret = add_kctx_to_channel(kctx, kchan);
df3c77c8 JG	347	/* Ownership of kctx is transferred to the callee. */
df3c77c8 JG	348	kctx = NULL;
f73fabfd	349	if (ret != LTTNG_OK) {
b579acd9 DG	350	goto error;
	351	}
	352	}
	353
df3c77c8	354	ret = LTTNG_OK;
b579acd9 DG	355
b579acd9 DG	356	error:
fc7324e8 DG	357	if (kctx) {
	358	trace_kernel_destroy_context(kctx);
	359	}
b579acd9 DG	360	return ret;
b579acd9 DG	361	}
2bdd86d4 MD	362
2bdd86d4 MD	363	/*
55cc08a6	364	* Add UST context to tracer.
2bdd86d4	365	*/
4ce7709b	366	int context_ust_add(struct ltt_ust_session *usess,
df4f5a87 JG	367	enum lttng_domain_type domain,
df4f5a87 JG	368	const struct lttng_event_context *ctx,
4ce7709b	369	char *channel_name)
2bdd86d4	370	{
601d5acf	371	int ret = LTTNG_OK;
442359c0	372	struct lttng_ht_iter iter;
bec39940	373	struct lttng_ht *chan_ht;
55cc08a6	374	struct ltt_ust_channel *uchan = NULL;
2bdd86d4	375
0525e9ae DG	376	assert(usess);
	377	assert(ctx);
	378	assert(channel_name);
	379
2223c96f DG	380	rcu_read_lock();
2223c96f DG	381
f5501dad	382	chan_ht = usess->domain_global.channels;
2bdd86d4	383
55cc08a6	384	/* Get UST channel if defined */
9f9ee9c9	385	if (channel_name[0] != '\0') {
55cc08a6 DG	386	uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
55cc08a6 DG	387	if (uchan == NULL) {
f73fabfd	388	ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2bdd86d4 MD	389	goto error;
2bdd86d4 MD	390	}
55cc08a6 DG	391	}
55cc08a6 DG	392
601d5acf DG	393	if (uchan) {
601d5acf DG	394	/* Add ctx to channel */
6b79ed20	395	ret = add_uctx_to_channel(usess, domain, uchan, ctx);
601d5acf	396	} else {
e7fe706f	397	rcu_read_lock();
601d5acf	398	/* Add ctx all events, all channels */
bec39940	399	cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
6b79ed20	400	ret = add_uctx_to_channel(usess, domain, uchan, ctx);
7682f304	401	if (ret) {
9589be74 JG	402	ERR("Failed to add context to channel %s",
9589be74 JG	403	uchan->name);
55cc08a6 DG	404	continue;
55cc08a6 DG	405	}
2bdd86d4	406	}
e7fe706f	407	rcu_read_unlock();
55cc08a6	408	}
2bdd86d4	409
55cc08a6	410	switch (ret) {
7682f304	411	case LTTNG_ERR_UST_CONTEXT_EXIST:
727d5404	412	break;
55cc08a6	413	case -ENOMEM:
7682f304	414	case -LTTNG_ERR_NOMEM:
f73fabfd	415	ret = LTTNG_ERR_FATAL;
727d5404 DG	416	break;
727d5404 DG	417	case -EINVAL:
f73fabfd	418	ret = LTTNG_ERR_UST_CONTEXT_INVAL;
727d5404 DG	419	break;
727d5404 DG	420	case -ENOSYS:
f73fabfd	421	ret = LTTNG_ERR_UNKNOWN_DOMAIN;
727d5404 DG	422	break;
727d5404 DG	423	default:
7682f304 JG	424	if (ret != 0 && ret != LTTNG_OK) {
	425	ret = ret > 0 ? ret : LTTNG_ERR_UNK;
	426	} else {
	427	ret = LTTNG_OK;
	428	}
727d5404	429	break;
2bdd86d4 MD	430	}
2bdd86d4 MD	431
2bdd86d4	432	error:
2223c96f	433	rcu_read_unlock();
2bdd86d4 MD	434	return ret;
2bdd86d4 MD	435	}