+++ /dev/null
-/*
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <lttng/event.h>
-#include <lttng/lttng-error.h>
-#include <lttng/kernel-probe.h>
-#include <lttng/userspace-probe.h>
-#include <lttng/userspace-probe-internal.h>
-#include <lttng/event-rule/event-rule.h>
-#include <lttng/event-rule/event-rule-internal.h>
-#include <lttng/event-rule/kernel-kprobe.h>
-#include <lttng/event-rule/kernel-kprobe-internal.h>
-#include <lttng/event-rule/kernel-syscall.h>
-#include <lttng/event-rule/kernel-syscall-internal.h>
-#include <lttng/event-rule/kernel-tracepoint.h>
-#include <lttng/event-rule/kernel-tracepoint-internal.h>
-#include <lttng/event-rule/kernel-uprobe.h>
-#include <lttng/event-rule/kernel-uprobe-internal.h>
-#include <common/common.h>
-#include <common/defaults.h>
-#include <common/trace-chunk.h>
-#include <common/macros.h>
-
-#include "consumer.h"
-#include "trace-kernel.h"
-#include "lttng-sessiond.h"
-#include "notification-thread-commands.h"
-
-/*
- * Find the channel name for the given kernel session.
- */
-struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
- const char *name, struct ltt_kernel_session *session)
-{
- struct ltt_kernel_channel *chan;
-
- LTTNG_ASSERT(session);
- LTTNG_ASSERT(name);
-
- /*
- * If we receive an empty string for channel name, it means the
- * default channel name is requested.
- */
- if (name[0] == '\0')
- name = DEFAULT_CHANNEL_NAME;
-
- DBG("Trying to find channel %s", name);
-
- cds_list_for_each_entry(chan, &session->channel_list.head, list) {
- if (strcmp(name, chan->channel->name) == 0) {
- DBG("Found channel by name %s", name);
- return chan;
- }
- }
-
- return NULL;
-}
-
-/*
- * Find the event for the given channel.
- */
-struct ltt_kernel_event *trace_kernel_find_event(
- char *name, struct ltt_kernel_channel *channel,
- enum lttng_event_type type,
- struct lttng_bytecode *filter)
-{
- struct ltt_kernel_event *ev;
- int found = 0;
-
- LTTNG_ASSERT(name);
- LTTNG_ASSERT(channel);
-
- cds_list_for_each_entry(ev, &channel->events_list.head, list) {
- if (type != LTTNG_EVENT_ALL && ev->type != type) {
- continue;
- }
- if (strcmp(name, ev->event->name)) {
- continue;
- }
- if ((ev->filter && !filter) || (!ev->filter && filter)) {
- continue;
- }
- if (ev->filter && filter) {
- if (ev->filter->len != filter->len ||
- memcmp(ev->filter->data, filter->data,
- filter->len) != 0) {
- continue;
- }
- }
- found = 1;
- break;
- }
- if (found) {
- DBG("Found event %s for channel %s", name,
- channel->channel->name);
- return ev;
- } else {
- return NULL;
- }
-}
-
-/*
- * Find the event name for the given channel.
- */
-struct ltt_kernel_event *trace_kernel_get_event_by_name(
- char *name, struct ltt_kernel_channel *channel,
- enum lttng_event_type type)
-{
- struct ltt_kernel_event *ev;
- int found = 0;
-
- LTTNG_ASSERT(name);
- LTTNG_ASSERT(channel);
-
- cds_list_for_each_entry(ev, &channel->events_list.head, list) {
- if (type != LTTNG_EVENT_ALL && ev->type != type) {
- continue;
- }
- if (strcmp(name, ev->event->name)) {
- continue;
- }
- found = 1;
- break;
- }
- if (found) {
- DBG("Found event %s for channel %s", name,
- channel->channel->name);
- return ev;
- } else {
- return NULL;
- }
-}
-
-/*
- * Allocate and initialize a kernel session data structure.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_kernel_session *trace_kernel_create_session(void)
-{
- struct ltt_kernel_session *lks = NULL;
-
- /* Allocate a new ltt kernel session */
- lks = zmalloc(sizeof(struct ltt_kernel_session));
- if (lks == NULL) {
- PERROR("create kernel session zmalloc");
- goto alloc_error;
- }
-
- /* Init data structure */
- lks->fd = -1;
- lks->metadata_stream_fd = -1;
- lks->channel_count = 0;
- lks->stream_count_global = 0;
- lks->metadata = NULL;
- CDS_INIT_LIST_HEAD(&lks->channel_list.head);
-
- lks->tracker_pid = process_attr_tracker_create();
- if (!lks->tracker_pid) {
- goto error;
- }
- lks->tracker_vpid = process_attr_tracker_create();
- if (!lks->tracker_vpid) {
- goto error;
- }
- lks->tracker_uid = process_attr_tracker_create();
- if (!lks->tracker_uid) {
- goto error;
- }
- lks->tracker_vuid = process_attr_tracker_create();
- if (!lks->tracker_vuid) {
- goto error;
- }
- lks->tracker_gid = process_attr_tracker_create();
- if (!lks->tracker_gid) {
- goto error;
- }
- lks->tracker_vgid = process_attr_tracker_create();
- if (!lks->tracker_vgid) {
- goto error;
- }
- lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
- if (lks->consumer == NULL) {
- goto error;
- }
-
- return lks;
-
-error:
- process_attr_tracker_destroy(lks->tracker_pid);
- process_attr_tracker_destroy(lks->tracker_vpid);
- process_attr_tracker_destroy(lks->tracker_uid);
- process_attr_tracker_destroy(lks->tracker_vuid);
- process_attr_tracker_destroy(lks->tracker_gid);
- process_attr_tracker_destroy(lks->tracker_vgid);
- free(lks);
-
-alloc_error:
- return NULL;
-}
-
-/*
- * Allocate and initialize a kernel channel data structure.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_kernel_channel *trace_kernel_create_channel(
- struct lttng_channel *chan)
-{
- struct ltt_kernel_channel *lkc;
- struct lttng_channel_extended *extended = NULL;
-
- LTTNG_ASSERT(chan);
-
- lkc = zmalloc(sizeof(struct ltt_kernel_channel));
- if (lkc == NULL) {
- PERROR("ltt_kernel_channel zmalloc");
- goto error;
- }
-
- lkc->channel = zmalloc(sizeof(struct lttng_channel));
- if (lkc->channel == NULL) {
- PERROR("lttng_channel zmalloc");
- goto error;
- }
-
- extended = zmalloc(sizeof(struct lttng_channel_extended));
- if (!extended) {
- PERROR("lttng_channel_channel zmalloc");
- goto error;
- }
- memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
- memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended));
- lkc->channel->attr.extended.ptr = extended;
- extended = NULL;
-
- /*
- * If we receive an empty string for channel name, it means the
- * default channel name is requested.
- */
- if (chan->name[0] == '\0') {
- strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME,
- sizeof(lkc->channel->name));
- }
- lkc->channel->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
-
- lkc->fd = -1;
- lkc->stream_count = 0;
- lkc->event_count = 0;
- lkc->enabled = 1;
- lkc->published_to_notification_thread = false;
- /* Init linked list */
- CDS_INIT_LIST_HEAD(&lkc->events_list.head);
- CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
- CDS_INIT_LIST_HEAD(&lkc->ctx_list);
-
- return lkc;
-
-error:
- if (lkc) {
- free(lkc->channel);
- }
- free(extended);
- free(lkc);
- return NULL;
-}
-
-/*
- * Allocate and init a kernel context object.
- *
- * Return the allocated object or NULL on error.
- */
-struct ltt_kernel_context *trace_kernel_create_context(
- struct lttng_kernel_abi_context *ctx)
-{
- struct ltt_kernel_context *kctx;
-
- kctx = zmalloc(sizeof(*kctx));
- if (!kctx) {
- PERROR("zmalloc kernel context");
- goto error;
- }
-
- if (ctx) {
- memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx));
- }
-error:
- return kctx;
-}
-
-/*
- * Allocate and init a kernel context object from an existing kernel context
- * object.
- *
- * Return the allocated object or NULL on error.
- */
-struct ltt_kernel_context *trace_kernel_copy_context(
- struct ltt_kernel_context *kctx)
-{
- struct ltt_kernel_context *kctx_copy;
-
- LTTNG_ASSERT(kctx);
- kctx_copy = zmalloc(sizeof(*kctx_copy));
- if (!kctx_copy) {
- PERROR("zmalloc ltt_kernel_context");
- goto error;
- }
-
- memcpy(kctx_copy, kctx, sizeof(*kctx_copy));
- memset(&kctx_copy->list, 0, sizeof(kctx_copy->list));
-
-error:
- return kctx_copy;
-}
-
-/*
- * Allocate and initialize a kernel event. Set name and event type.
- * We own filter_expression, and filter.
- *
- * Return pointer to structure or NULL.
- */
-enum lttng_error_code trace_kernel_create_event(
- struct lttng_event *ev, char *filter_expression,
- struct lttng_bytecode *filter,
- struct ltt_kernel_event **kernel_event)
-{
- enum lttng_error_code ret;
- struct lttng_kernel_abi_event *attr;
- struct ltt_kernel_event *local_kernel_event;
- struct lttng_userspace_probe_location *userspace_probe_location = NULL;
-
- LTTNG_ASSERT(ev);
-
- local_kernel_event = zmalloc(sizeof(struct ltt_kernel_event));
- attr = zmalloc(sizeof(struct lttng_kernel_abi_event));
- if (local_kernel_event == NULL || attr == NULL) {
- PERROR("kernel event zmalloc");
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
-
- switch (ev->type) {
- case LTTNG_EVENT_PROBE:
- attr->instrumentation = LTTNG_KERNEL_ABI_KPROBE;
- attr->u.kprobe.addr = ev->attr.probe.addr;
- attr->u.kprobe.offset = ev->attr.probe.offset;
- strncpy(attr->u.kprobe.symbol_name,
- ev->attr.probe.symbol_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
- attr->u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
- break;
- case LTTNG_EVENT_USERSPACE_PROBE:
- {
- const struct lttng_userspace_probe_location* location = NULL;
- const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
-
- location = lttng_event_get_userspace_probe_location(ev);
- if (!location) {
- ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto error;
- }
-
- /*
- * From this point on, the specific term 'uprobe' is used
- * instead of the generic 'userspace probe' because it's the
- * technology used at the moment for this instrumentation.
- * LTTng currently implements userspace probes using uprobes.
- * In the interactions with the kernel tracer, we use the
- * uprobe term.
- */
- attr->instrumentation = LTTNG_KERNEL_ABI_UPROBE;
-
- lookup = lttng_userspace_probe_location_get_lookup_method(
- location);
- if (!lookup) {
- ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto error;
- }
-
- /*
- * From the kernel tracer's perspective, all userspace probe
- * event types are all the same: a file and an offset.
- */
- switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
- case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
- /* Get the file descriptor on the target binary. */
- attr->u.uprobe.fd =
- lttng_userspace_probe_location_function_get_binary_fd(location);
-
- /*
- * Save a reference to the probe location used during
- * the listing of events.
- */
- userspace_probe_location =
- lttng_userspace_probe_location_copy(location);
- break;
- case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
- /* Get the file descriptor on the target binary. */
- attr->u.uprobe.fd =
- lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
-
- /*
- * Save a reference to the probe location used during the listing of
- * events.
- */
- userspace_probe_location =
- lttng_userspace_probe_location_copy(location);
- break;
- default:
- DBG("Unsupported lookup method type");
- ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto error;
- }
- break;
- }
- case LTTNG_EVENT_FUNCTION:
- attr->instrumentation = LTTNG_KERNEL_ABI_KRETPROBE;
- attr->u.kretprobe.addr = ev->attr.probe.addr;
- attr->u.kretprobe.offset = ev->attr.probe.offset;
- strncpy(attr->u.kretprobe.symbol_name,
- ev->attr.probe.symbol_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
- attr->u.kretprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
- break;
- case LTTNG_EVENT_FUNCTION_ENTRY:
- attr->instrumentation = LTTNG_KERNEL_ABI_FUNCTION;
- strncpy(attr->u.ftrace.symbol_name,
- ev->attr.ftrace.symbol_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
- attr->u.ftrace.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
- break;
- case LTTNG_EVENT_TRACEPOINT:
- attr->instrumentation = LTTNG_KERNEL_ABI_TRACEPOINT;
- break;
- case LTTNG_EVENT_SYSCALL:
- attr->instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
- attr->u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL;
- attr->u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT;
- attr->u.syscall.match = LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME;
- break;
- case LTTNG_EVENT_ALL:
- attr->instrumentation = LTTNG_KERNEL_ABI_ALL;
- break;
- default:
- ERR("Unknown kernel instrumentation type (%d)", ev->type);
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- /* Copy event name */
- strncpy(attr->name, ev->name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
- attr->name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
-
- /* Setting up a kernel event */
- local_kernel_event->fd = -1;
- local_kernel_event->event = attr;
- local_kernel_event->enabled = 1;
- local_kernel_event->filter_expression = filter_expression;
- local_kernel_event->filter = filter;
- local_kernel_event->userspace_probe_location = userspace_probe_location;
-
- *kernel_event = local_kernel_event;
-
- return LTTNG_OK;
-
-error:
- free(filter_expression);
- free(filter);
- free(local_kernel_event);
- free(attr);
- return ret;
-}
-
-/*
- * Allocate and initialize a kernel token event rule.
- *
- * Return pointer to structure or NULL.
- */
-enum lttng_error_code trace_kernel_create_event_notifier_rule(
- struct lttng_trigger *trigger,
- uint64_t token,
- uint64_t error_counter_index,
- struct ltt_kernel_event_notifier_rule **event_notifier_rule)
-{
- enum lttng_error_code ret = LTTNG_OK;
- enum lttng_condition_type condition_type;
- enum lttng_event_rule_type event_rule_type;
- enum lttng_condition_status condition_status;
- struct ltt_kernel_event_notifier_rule *local_kernel_token_event_rule;
- const struct lttng_condition *condition = NULL;
- const struct lttng_event_rule *event_rule = NULL;
-
- LTTNG_ASSERT(event_notifier_rule);
-
- condition = lttng_trigger_get_const_condition(trigger);
- LTTNG_ASSERT(condition);
-
- condition_type = lttng_condition_get_type(condition);
- LTTNG_ASSERT(condition_type == LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES);
-
- condition_status = lttng_condition_event_rule_matches_get_rule(
- condition, &event_rule);
- LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK);
- LTTNG_ASSERT(event_rule);
-
- event_rule_type = lttng_event_rule_get_type(event_rule);
- LTTNG_ASSERT(event_rule_type != LTTNG_EVENT_RULE_TYPE_UNKNOWN);
-
- local_kernel_token_event_rule =
- zmalloc(sizeof(struct ltt_kernel_event_notifier_rule));
- if (local_kernel_token_event_rule == NULL) {
- PERROR("Failed to allocate ltt_kernel_token_event_rule structure");
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
-
- local_kernel_token_event_rule->fd = -1;
- local_kernel_token_event_rule->enabled = 1;
- local_kernel_token_event_rule->token = token;
- local_kernel_token_event_rule->error_counter_index = error_counter_index;
-
- /* Get the reference of the event rule. */
- lttng_trigger_get(trigger);
-
- local_kernel_token_event_rule->trigger = trigger;
- /* The event rule still owns the filter and bytecode. */
- local_kernel_token_event_rule->filter =
- lttng_event_rule_get_filter_bytecode(event_rule);
-
- DBG3("Created kernel event notifier rule: token = %" PRIu64,
- local_kernel_token_event_rule->token);
-error:
- *event_notifier_rule = local_kernel_token_event_rule;
- return ret;
-}
-
-/*
- * Initialize a kernel trigger from an event rule.
- */
-enum lttng_error_code trace_kernel_init_event_notifier_from_event_rule(
- const struct lttng_event_rule *rule,
- struct lttng_kernel_abi_event_notifier *kernel_event_notifier)
-{
- enum lttng_error_code ret_code;
- const char *name;
- int strncpy_ret;
-
- switch (lttng_event_rule_get_type(rule)) {
- case LTTNG_EVENT_RULE_TYPE_KERNEL_KPROBE:
- {
- uint64_t address = 0, offset = 0;
- const char *symbol_name = NULL;
- const struct lttng_kernel_probe_location *location = NULL;
- enum lttng_kernel_probe_location_status k_status;
- enum lttng_event_rule_status status;
-
- status = lttng_event_rule_kernel_kprobe_get_location(rule, &location);
- if (status != LTTNG_EVENT_RULE_STATUS_OK) {
- ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto error;
- }
-
- switch (lttng_kernel_probe_location_get_type(location)) {
- case LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS:
- {
- k_status = lttng_kernel_probe_location_address_get_address(
- location, &address);
- LTTNG_ASSERT(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
- break;
- }
- case LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET:
- {
- k_status = lttng_kernel_probe_location_symbol_get_offset(
- location, &offset);
- LTTNG_ASSERT(k_status == LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK);
- symbol_name = lttng_kernel_probe_location_symbol_get_name(
- location);
- break;
- }
- default:
- abort();
- }
-
- kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_ABI_KPROBE;
- kernel_event_notifier->event.u.kprobe.addr = address;
- kernel_event_notifier->event.u.kprobe.offset = offset;
- if (symbol_name) {
- strncpy_ret = lttng_strncpy(
- kernel_event_notifier->event.u.kprobe.symbol_name,
- symbol_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
-
- if (strncpy_ret) {
- ret_code = LTTNG_ERR_INVALID;
- goto error;
- }
- }
-
- kernel_event_notifier->event.u.kprobe.symbol_name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
-
- status = lttng_event_rule_kernel_kprobe_get_event_name(rule, &name);
- LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK);
- ret_code = LTTNG_OK;
- break;
- }
- case LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE:
- {
- const struct lttng_userspace_probe_location* location = NULL;
- const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
- enum lttng_event_rule_status status;
-
- status = lttng_event_rule_kernel_uprobe_get_location(rule, &location);
- if (status != LTTNG_EVENT_RULE_STATUS_OK) {
- ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto error;
- }
-
- kernel_event_notifier->event.instrumentation = LTTNG_KERNEL_ABI_UPROBE;
-
- lookup = lttng_userspace_probe_location_get_lookup_method(
- location);
- if (!lookup) {
- ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto error;
- }
-
- /*
- * From the kernel tracer's perspective, all userspace probe
- * event types are all the same: a file and an offset.
- */
- switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
- case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
- /* Get the file descriptor on the target binary. */
- kernel_event_notifier->event.u.uprobe.fd =
- lttng_userspace_probe_location_function_get_binary_fd(location);
-
- break;
- case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
- /* Get the file descriptor on the target binary. */
- kernel_event_notifier->event.u.uprobe.fd =
- lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
- break;
- default:
- abort();
- }
-
- status = lttng_event_rule_kernel_uprobe_get_event_name(
- rule, &name);
- LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK);
- ret_code = LTTNG_OK;
- break;
- }
- case LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT:
- {
- const enum lttng_event_rule_status status =
- lttng_event_rule_kernel_tracepoint_get_name_pattern(
- rule, &name);
-
- LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK);
- kernel_event_notifier->event.instrumentation =
- LTTNG_KERNEL_ABI_TRACEPOINT;
-
- ret_code = LTTNG_OK;
- break;
- }
- case LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL:
- {
- const enum lttng_event_rule_status status =
- lttng_event_rule_kernel_syscall_get_name_pattern(
- rule, &name);
- const enum lttng_event_rule_kernel_syscall_emission_site
- emission_site =
- lttng_event_rule_kernel_syscall_get_emission_site(rule);
- enum lttng_kernel_abi_syscall_entryexit entryexit;
-
- LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK);
- LTTNG_ASSERT(emission_site != LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_UNKNOWN);
-
- switch(emission_site) {
- case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY:
- entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
- break;
- case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_EXIT:
- entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
- break;
- case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY_EXIT:
- entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT;
- break;
- default:
- abort();
- break;
- }
-
- kernel_event_notifier->event.instrumentation =
- LTTNG_KERNEL_ABI_SYSCALL;
- kernel_event_notifier->event.u.syscall.abi =
- LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL;
- kernel_event_notifier->event.u.syscall.entryexit =
- entryexit;
- kernel_event_notifier->event.u.syscall.match =
- LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME;
- ret_code = LTTNG_OK;
- break;
- }
- default:
- abort();
- break;
- }
-
- strncpy_ret = lttng_strncpy(kernel_event_notifier->event.name, name,
- LTTNG_KERNEL_ABI_SYM_NAME_LEN);
- if (strncpy_ret) {
- ret_code = LTTNG_ERR_INVALID;
- goto error;
- }
-
-error:
- return ret_code;
-}
-/*
- * Allocate and initialize a kernel metadata.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
-{
- int ret;
- struct ltt_kernel_metadata *lkm;
- struct lttng_channel *chan;
-
- lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
- chan = zmalloc(sizeof(struct lttng_channel));
- if (lkm == NULL || chan == NULL) {
- PERROR("kernel metadata zmalloc");
- goto error;
- }
-
- ret = lttng_strncpy(
- chan->name, DEFAULT_METADATA_NAME, sizeof(chan->name));
- if (ret) {
- ERR("Failed to initialize metadata channel name to `%s`",
- DEFAULT_METADATA_NAME);
- goto error;
- }
-
- /* Set default attributes */
- chan->attr.overwrite = DEFAULT_METADATA_OVERWRITE;
- chan->attr.subbuf_size = default_get_metadata_subbuf_size();
- chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
- chan->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
- chan->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;;
-
-
- /*
- * The metadata channel of kernel sessions must use the "mmap"
- * back-end since the consumer daemon accumulates complete
- * metadata units before sending them to the relay daemon in
- * live mode. The consumer daemon also needs to extract the contents
- * of the metadata cache when computing a rotation position.
- *
- * In both cases, it is not possible to rely on the splice
- * back-end as the consumer daemon may need to accumulate more
- * content than can be backed by the ring buffer's underlying
- * pages.
- */
- chan->attr.output = LTTNG_EVENT_MMAP;
- chan->attr.tracefile_size = 0;
- chan->attr.tracefile_count = 0;
- chan->attr.live_timer_interval = 0;
-
- /* Init metadata */
- lkm->fd = -1;
- lkm->conf = chan;
-
- return lkm;
-
-error:
- free(lkm);
- free(chan);
- return NULL;
-}
-
-/*
- * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
- * default.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
- unsigned int count)
-{
- int ret;
- struct ltt_kernel_stream *lks;
-
- LTTNG_ASSERT(name);
-
- lks = zmalloc(sizeof(struct ltt_kernel_stream));
- if (lks == NULL) {
- PERROR("kernel stream zmalloc");
- goto error;
- }
-
- /* Set name */
- ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count);
- if (ret < 0) {
- PERROR("snprintf stream name");
- goto error;
- }
- lks->name[sizeof(lks->name) - 1] = '\0';
-
- /* Init stream */
- lks->fd = -1;
- lks->state = 0;
- lks->cpu = count;
-
- return lks;
-
-error:
- return NULL;
-}
-
-/*
- * Cleanup kernel stream structure.
- */
-void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
-{
- LTTNG_ASSERT(stream);
-
- DBG("[trace] Closing stream fd %d", stream->fd);
- /* Close kernel fd */
- if (stream->fd >= 0) {
- int ret;
-
- ret = close(stream->fd);
- if (ret) {
- PERROR("close");
- }
- }
- /* Remove from stream list */
- cds_list_del(&stream->list);
-
- free(stream);
-}
-
-/*
- * Cleanup kernel event structure.
- */
-void trace_kernel_destroy_event(struct ltt_kernel_event *event)
-{
- LTTNG_ASSERT(event);
-
- if (event->fd >= 0) {
- int ret;
-
- DBG("[trace] Closing event fd %d", event->fd);
- /* Close kernel fd */
- ret = close(event->fd);
- if (ret) {
- PERROR("close");
- }
- } else {
- DBG("[trace] Tearing down event (no associated file descriptor)");
- }
-
- /* Remove from event list */
- cds_list_del(&event->list);
-
- free(event->filter_expression);
- free(event->filter);
-
- free(event->event);
- free(event);
-}
-
-/*
- * Cleanup kernel event structure.
- */
-static void free_token_event_rule_rcu(struct rcu_head *rcu_node)
-{
- struct ltt_kernel_event_notifier_rule *rule = caa_container_of(rcu_node,
- struct ltt_kernel_event_notifier_rule, rcu_node);
-
- free(rule);
-}
-
-void trace_kernel_destroy_event_notifier_rule(
- struct ltt_kernel_event_notifier_rule *event)
-{
- LTTNG_ASSERT(event);
-
- if (event->fd >= 0) {
- const int ret = close(event->fd);
-
- DBG("Closing kernel event notifier rule file descriptor: fd = %d",
- event->fd);
- if (ret) {
- PERROR("Failed to close kernel event notifier file descriptor: fd = %d",
- event->fd);
- }
- } else {
- DBG("Destroying kernel event notifier rule (no associated file descriptor)");
- }
-
- lttng_trigger_put(event->trigger);
- call_rcu(&event->rcu_node, free_token_event_rule_rcu);
-}
-/*
- * Cleanup kernel context structure.
- */
-void trace_kernel_destroy_context(struct ltt_kernel_context *ctx)
-{
- LTTNG_ASSERT(ctx);
-
- if (ctx->in_list) {
- cds_list_del(&ctx->list);
- }
- free(ctx);
-}
-
-/*
- * Cleanup kernel channel structure.
- */
-void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
-{
- struct ltt_kernel_stream *stream, *stmp;
- struct ltt_kernel_event *event, *etmp;
- struct ltt_kernel_context *ctx, *ctmp;
- int ret;
- enum lttng_error_code status;
-
- LTTNG_ASSERT(channel);
-
- DBG("[trace] Closing channel fd %d", channel->fd);
- /* Close kernel fd */
- if (channel->fd >= 0) {
- ret = close(channel->fd);
- if (ret) {
- PERROR("close");
- }
- }
-
- /* For each stream in the channel list */
- cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
- trace_kernel_destroy_stream(stream);
- }
-
- /* For each event in the channel list */
- cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
- trace_kernel_destroy_event(event);
- }
-
- /* For each context in the channel list */
- cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) {
- trace_kernel_destroy_context(ctx);
- }
-
- /* Remove from channel list */
- cds_list_del(&channel->list);
-
- if (the_notification_thread_handle &&
- channel->published_to_notification_thread) {
- status = notification_thread_command_remove_channel(
- the_notification_thread_handle, channel->key,
- LTTNG_DOMAIN_KERNEL);
- LTTNG_ASSERT(status == LTTNG_OK);
- }
- free(channel->channel->attr.extended.ptr);
- free(channel->channel);
- free(channel);
-}
-
-/*
- * Cleanup kernel metadata structure.
- */
-void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
-{
- LTTNG_ASSERT(metadata);
-
- DBG("[trace] Closing metadata fd %d", metadata->fd);
- /* Close kernel fd */
- if (metadata->fd >= 0) {
- int ret;
-
- ret = close(metadata->fd);
- if (ret) {
- PERROR("close");
- }
- }
-
- free(metadata->conf);
- free(metadata);
-}
-
-/*
- * Cleanup kernel session structure
- *
- * Should *NOT* be called with RCU read-side lock held.
- */
-void trace_kernel_destroy_session(struct ltt_kernel_session *session)
-{
- struct ltt_kernel_channel *channel, *ctmp;
- int ret;
-
- LTTNG_ASSERT(session);
-
- DBG("[trace] Closing session fd %d", session->fd);
- /* Close kernel fds */
- if (session->fd >= 0) {
- ret = close(session->fd);
- if (ret) {
- PERROR("close");
- }
- }
-
- if (session->metadata_stream_fd >= 0) {
- DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
- ret = close(session->metadata_stream_fd);
- if (ret) {
- PERROR("close");
- }
- }
-
- if (session->metadata != NULL) {
- trace_kernel_destroy_metadata(session->metadata);
- }
-
- cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
- trace_kernel_destroy_channel(channel);
- }
-}
-
-/* Free elements needed by destroy notifiers. */
-void trace_kernel_free_session(struct ltt_kernel_session *session)
-{
- /* Wipe consumer output object */
- consumer_output_put(session->consumer);
-
- process_attr_tracker_destroy(session->tracker_pid);
- process_attr_tracker_destroy(session->tracker_vpid);
- process_attr_tracker_destroy(session->tracker_uid);
- process_attr_tracker_destroy(session->tracker_vuid);
- process_attr_tracker_destroy(session->tracker_gid);
- process_attr_tracker_destroy(session->tracker_vgid);
-
- free(session);
-}
projects / lttng-tools.git / blobdiff