X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-context.c;h=e408defc9893fc038d0901126cc844143c19fca3;hb=HEAD;hp=8ed9bbd4f1db15b13d1d56daaeacbdddc5921b8c;hpb=daacdbfc04fe07ecff0a0d1878b4f48d38912c78;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-context.c b/liblttng-ust/lttng-context.c
deleted file mode 100644
index 8ed9bbd4..00000000
--- a/liblttng-ust/lttng-context.c
+++ /dev/null
@@ -1,469 +0,0 @@
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * LTTng UST trace/channel/event context management.
- */
-
-#define _LGPL_SOURCE
-#include <lttng/ust-events.h>
-#include <lttng/ust-tracer.h>
-#include <ust-context-provider.h>
-#include <lttng/urcu/pointer.h>
-#include <lttng/urcu/urcu-ust.h>
-#include <usterr-signal-safe.h>
-#include <ust-helper.h>
-#include <stddef.h>
-#include <string.h>
-#include <assert.h>
-#include "tracepoint-internal.h"
-
-#include "context-internal.h"
-
-/*
- * The filter implementation requires that two consecutive "get" for the
- * same context performed by the same thread return the same result.
- */
-
-int lttng_find_context(struct lttng_ust_ctx *ctx, const char *name)
-{
-	unsigned int i;
-	const char *subname;
-
-	if (strncmp(name, "$ctx.", strlen("$ctx.")) == 0) {
-		subname = name + strlen("$ctx.");
-	} else {
-		subname = name;
-	}
-	for (i = 0; i < ctx->nr_fields; i++) {
-		/* Skip allocated (but non-initialized) contexts */
-		if (!ctx->fields[i]->event_field->name)
-			continue;
-		if (!strcmp(ctx->fields[i]->event_field->name, subname))
-			return 1;
-	}
-	return 0;
-}
-
-int lttng_get_context_index(struct lttng_ust_ctx *ctx, const char *name)
-{
-	unsigned int i;
-	const char *subname;
-
-	if (!ctx)
-		return -1;
-	if (strncmp(name, "$ctx.", strlen("$ctx.")) == 0) {
-		subname = name + strlen("$ctx.");
-	} else {
-		subname = name;
-	}
-	for (i = 0; i < ctx->nr_fields; i++) {
-		/* Skip allocated (but non-initialized) contexts */
-		if (!ctx->fields[i]->event_field->name)
-			continue;
-		if (!strcmp(ctx->fields[i]->event_field->name, subname))
-			return i;
-	}
-	return -1;
-}
-
-static int lttng_find_context_provider(struct lttng_ust_ctx *ctx, const char *name)
-{
-	unsigned int i;
-
-	for (i = 0; i < ctx->nr_fields; i++) {
-		/* Skip allocated (but non-initialized) contexts */
-		if (!ctx->fields[i]->event_field->name)
-			continue;
-		if (!strncmp(ctx->fields[i]->event_field->name, name,
-				strlen(name)))
-			return 1;
-	}
-	return 0;
-}
-
-/*
- * Note: as we append context information, the pointer location may change.
- * lttng_add_context leaves the new last context initialized to NULL.
- */
-static
-int lttng_add_context(struct lttng_ust_ctx **ctx_p)
-{
-	struct lttng_ust_ctx *ctx;
-
-	if (!*ctx_p) {
-		*ctx_p = zmalloc(sizeof(struct lttng_ust_ctx));
-		if (!*ctx_p)
-			return -ENOMEM;
-		(*ctx_p)->struct_size = sizeof(struct lttng_ust_ctx);
-		(*ctx_p)->largest_align = 1;
-	}
-	ctx = *ctx_p;
-	if (ctx->nr_fields + 1 > ctx->allocated_fields) {
-		struct lttng_ust_ctx_field **new_fields;
-
-		ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
-		new_fields = zmalloc(ctx->allocated_fields * sizeof(*new_fields));
-		if (!new_fields)
-			return -ENOMEM;
-		/* Copy pointers */
-		if (ctx->fields)
-			memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields);
-		free(ctx->fields);
-		ctx->fields = new_fields;
-	}
-	ctx->nr_fields++;
-	return 0;
-}
-
-struct lttng_ust_ctx_field *lttng_append_context(struct lttng_ust_ctx **ctx_p)
-{
-	struct lttng_ust_ctx_field *field;
-	int ret;
-
-	field = zmalloc(sizeof(struct lttng_ust_ctx_field));
-	if (!field)
-		goto error_alloc_field;
-	field->struct_size = sizeof(struct lttng_ust_ctx_field);
-	field->event_field = zmalloc(sizeof(struct lttng_ust_event_field));
-	if (!field->event_field)
-		goto error_alloc_event_field;
-	field->event_field->struct_size = sizeof(struct lttng_ust_event_field);
-
-	ret = lttng_add_context(ctx_p);
-	if (ret)
-		goto error_add_context;
-	(*ctx_p)->fields[(*ctx_p)->nr_fields - 1] = field;
-	return field;
-
-error_add_context:
-	free(field->event_field);
-error_alloc_event_field:
-	free(field);
-error_alloc_field:
-	return NULL;
-}
-
-/*
- * Takes ownership of @f on success.
- */
-int lttng_context_add_rcu(struct lttng_ust_ctx **ctx_p,
-		struct lttng_ust_ctx_field *f)
-{
-	struct lttng_ust_ctx *old_ctx = *ctx_p, *new_ctx = NULL;
-	struct lttng_ust_ctx_field **new_fields = NULL;
-	int ret;
-
-	if (old_ctx) {
-		new_ctx = zmalloc(sizeof(struct lttng_ust_ctx));
-		if (!new_ctx)
-			return -ENOMEM;
-		new_ctx->struct_size = sizeof(struct lttng_ust_ctx);
-		*new_ctx = *old_ctx;
-		new_fields = zmalloc(new_ctx->allocated_fields * sizeof(*new_fields));
-		if (!new_fields) {
-			free(new_ctx);
-			return -ENOMEM;
-		}
-		/* Copy pointers */
-		memcpy(new_fields, old_ctx->fields,
-				sizeof(*old_ctx->fields) * old_ctx->nr_fields);
-		new_ctx->fields = new_fields;
-	}
-	ret = lttng_add_context(&new_ctx);
-	if (ret) {
-		free(new_fields);
-		free(new_ctx);
-		return ret;
-	}
-	/* Taking ownership of f. */
-	(*ctx_p)->fields[(*ctx_p)->nr_fields - 1] = f;
-	lttng_context_update(new_ctx);
-	lttng_ust_rcu_assign_pointer(*ctx_p, new_ctx);
-	lttng_ust_urcu_synchronize_rcu();
-	if (old_ctx) {
-		free(old_ctx->fields);
-		free(old_ctx);
-	}
-	return 0;
-}
-
-/*
- * lttng_context_update() should be called at least once between context
- * modification and trace start.
- */
-void lttng_context_update(struct lttng_ust_ctx *ctx)
-{
-	int i;
-	size_t largest_align = 8;	/* in bits */
-
-	for (i = 0; i < ctx->nr_fields; i++) {
-		struct lttng_type *type;
-		size_t field_align = 8;
-
-		type = &ctx->fields[i]->event_field->type;
-		switch (type->atype) {
-		case atype_integer:
-			field_align = type->u.integer.alignment;
-			break;
-		case atype_array_nestable:
-		{
-			const struct lttng_type *nested_type;
-
-			nested_type = type->u.array_nestable.elem_type;
-			switch (nested_type->atype) {
-			case atype_integer:
-				field_align = nested_type->u.integer.alignment;
-				break;
-			case atype_string:
-				break;
-
-			case atype_array_nestable:
-			case atype_sequence_nestable:
-			default:
-				WARN_ON_ONCE(1);
-				break;
-			}
-			field_align = max_t(size_t, field_align,
-					type->u.array_nestable.alignment);
-			break;
-		}
-		case atype_sequence_nestable:
-		{
-			const struct lttng_type *nested_type;
-
-			nested_type = type->u.sequence_nestable.elem_type;
-			switch (nested_type->atype) {
-			case atype_integer:
-				field_align = nested_type->u.integer.alignment;
-				break;
-
-			case atype_string:
-				break;
-
-			case atype_array_nestable:
-			case atype_sequence_nestable:
-			default:
-				WARN_ON_ONCE(1);
-				break;
-			}
-			field_align = max_t(size_t, field_align,
-					type->u.sequence_nestable.alignment);
-			break;
-		}
-		case atype_string:
-			break;
-		case atype_dynamic:
-			break;
-		case atype_enum_nestable:
-		default:
-			WARN_ON_ONCE(1);
-			break;
-		}
-		largest_align = max_t(size_t, largest_align, field_align);
-	}
-	ctx->largest_align = largest_align >> 3;	/* bits to bytes */
-}
-
-/*
- * Remove last context field.
- */
-void lttng_remove_context_field(struct lttng_ust_ctx **ctx_p,
-				struct lttng_ust_ctx_field *field)
-{
-	struct lttng_ust_ctx *ctx;
-
-	ctx = *ctx_p;
-	ctx->nr_fields--;
-	assert(ctx->fields[ctx->nr_fields] == field);
-	assert(field->field_name == NULL);
-	ctx->fields[ctx->nr_fields] = NULL;
-}
-
-void lttng_destroy_context(struct lttng_ust_ctx *ctx)
-{
-	int i;
-
-	if (!ctx)
-		return;
-	for (i = 0; i < ctx->nr_fields; i++) {
-		if (ctx->fields[i]->destroy)
-			ctx->fields[i]->destroy(ctx->fields[i]);
-		free(ctx->fields[i]->field_name);
-		free(ctx->fields[i]->event_field);
-		free(ctx->fields[i]);
-	}
-	free(ctx->fields);
-	free(ctx);
-}
-
-/*
- * Can be safely performed concurrently with tracing using the struct
- * lttng_ctx. Using RCU update. Needs to match RCU read-side handling of
- * contexts.
- *
- * This does not allow adding, removing, or changing typing of the
- * contexts, since this needs to stay invariant for metadata. However,
- * it allows updating the handlers associated with all contexts matching
- * a provider (by name) while tracing is using it, in a way that ensures
- * a single RCU read-side critical section see either all old, or all
- * new handlers.
- */
-int lttng_ust_context_set_provider_rcu(struct lttng_ust_ctx **_ctx,
-		const char *name,
-		size_t (*get_size)(struct lttng_ust_ctx_field *field, size_t offset),
-		void (*record)(struct lttng_ust_ctx_field *field,
-			struct lttng_ust_lib_ring_buffer_ctx *ctx,
-			struct lttng_channel *chan),
-		void (*get_value)(struct lttng_ust_ctx_field *field,
-			struct lttng_ust_ctx_value *value))
-{
-	int i, ret;
-	struct lttng_ust_ctx *ctx = *_ctx, *new_ctx;
-	struct lttng_ust_ctx_field **new_fields;
-
-	if (!ctx || !lttng_find_context_provider(ctx, name))
-		return 0;
-	/*
-	 * We have at least one instance of context for the provider.
-	 */
-	new_ctx = zmalloc(sizeof(*new_ctx));
-	if (!new_ctx)
-		return -ENOMEM;
-	new_ctx->struct_size = sizeof(*new_ctx);
-	*new_ctx = *ctx;
-	new_fields = zmalloc(sizeof(*new_fields) * ctx->allocated_fields);
-	if (!new_fields) {
-		ret = -ENOMEM;
-		goto field_error;
-	}
-	/* Copy pointers */
-	memcpy(new_fields, ctx->fields,
-		sizeof(*new_fields) * ctx->allocated_fields);
-	for (i = 0; i < ctx->nr_fields; i++) {
-		if (strncmp(new_fields[i]->event_field->name,
-				name, strlen(name)) != 0)
-			continue;
-		new_fields[i]->get_size = get_size;
-		new_fields[i]->record = record;
-		new_fields[i]->get_value = get_value;
-	}
-	new_ctx->fields = new_fields;
-	lttng_ust_rcu_assign_pointer(*_ctx, new_ctx);
-	lttng_ust_urcu_synchronize_rcu();
-	free(ctx->fields);
-	free(ctx);
-	return 0;
-
-field_error:
-	free(new_ctx);
-	return ret;
-}
-
-int lttng_context_init_all(struct lttng_ust_ctx **ctx)
-{
-	int ret;
-
-	ret = lttng_add_pthread_id_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_pthread_id_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_vtid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_vtid_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_vpid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_vpid_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_procname_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_procname_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_cpu_id_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_cpu_id_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_cgroup_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_cgroup_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_ipc_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_ipc_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_mnt_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_mnt_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_net_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_net_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_pid_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_pid_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_time_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_time_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_user_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_user_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_uts_ns_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_uts_ns_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_vuid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_vuid_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_veuid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_veuid_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_vsuid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_vsuid_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_vgid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_vgid_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_vegid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_vegid_to_ctx");
-		goto error;
-	}
-	ret = lttng_add_vsgid_to_ctx(ctx);
-	if (ret) {
-		WARN("Cannot add context lttng_add_vsgid_to_ctx");
-		goto error;
-	}
-	lttng_context_update(*ctx);
-	return 0;
-
-error:
-	lttng_destroy_context(*ctx);
-	return ret;
-}