/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _LGPL_SOURCE
#include <string.h>
#include <unistd.h>
+#include <lttng/event.h>
+#include <lttng/lttng-error.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/kprobe.h>
+#include <lttng/event-rule/kprobe-internal.h>
+#include <lttng/event-rule/kretprobe.h>
+#include <lttng/event-rule/kretprobe-internal.h>
+#include <lttng/event-rule/syscall.h>
+#include <lttng/event-rule/syscall-internal.h>
+#include <lttng/event-rule/tracepoint.h>
+#include <lttng/event-rule/tracepoint-internal.h>
+#include <lttng/event-rule/uprobe-internal.h>
#include <common/common.h>
#include <common/defaults.h>
+#include <common/trace-chunk.h>
#include "consumer.h"
#include "trace-kernel.h"
* Find the channel name for the given kernel session.
*/
struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
- char *name, struct ltt_kernel_session *session)
+ const char *name, struct ltt_kernel_session *session)
{
struct ltt_kernel_channel *chan;
}
}
+struct ltt_kernel_token_event_rule *trace_kernel_find_trigger_by_token(
+ struct ltt_kernel_token_event_rule_list *list,
+ uint64_t token)
+{
+ struct ltt_kernel_token_event_rule *token_event_rule;
+ int found = 0;
+
+ assert(list);
+
+ cds_list_for_each_entry(token_event_rule, &list->head, list) {
+ if (token_event_rule->token == token) {
+ found = 1;
+ }
+ break;
+ }
+ if (found) {
+ DBG("Found token event rule %" PRIu64, token);
+ return token_event_rule;
+ } else {
+ return NULL;
+ }
+}
+
/*
* Allocate and initialize a kernel session data structure.
*
lks->metadata = NULL;
CDS_INIT_LIST_HEAD(&lks->channel_list.head);
+ lks->tracker_list_pid = lttng_tracker_list_create();
+ if (!lks->tracker_list_pid) {
+ goto error;
+ }
+ lks->tracker_list_vpid = lttng_tracker_list_create();
+ if (!lks->tracker_list_vpid) {
+ goto error;
+ }
+ lks->tracker_list_uid = lttng_tracker_list_create();
+ if (!lks->tracker_list_uid) {
+ goto error;
+ }
+ lks->tracker_list_vuid = lttng_tracker_list_create();
+ if (!lks->tracker_list_vuid) {
+ goto error;
+ }
+ lks->tracker_list_gid = lttng_tracker_list_create();
+ if (!lks->tracker_list_gid) {
+ goto error;
+ }
+ lks->tracker_list_vgid = lttng_tracker_list_create();
+ if (!lks->tracker_list_vgid) {
+ goto error;
+ }
lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
if (lks->consumer == NULL) {
goto error;
return lks;
error:
+ lttng_tracker_list_destroy(lks->tracker_list_pid);
+ lttng_tracker_list_destroy(lks->tracker_list_vpid);
+ lttng_tracker_list_destroy(lks->tracker_list_uid);
+ lttng_tracker_list_destroy(lks->tracker_list_vuid);
+ lttng_tracker_list_destroy(lks->tracker_list_gid);
+ lttng_tracker_list_destroy(lks->tracker_list_vgid);
free(lks);
alloc_error:
enum lttng_error_code ret;
struct lttng_kernel_event *attr;
struct ltt_kernel_event *local_kernel_event;
+ struct lttng_userspace_probe_location *userspace_probe_location = NULL;
assert(ev);
ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
attr->u.kprobe.symbol_name[LTTNG_KERNEL_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_UPROBE;
+
+ /*
+ * Only the elf lookup method is supported at the moment.
+ */
+ 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. Close its FD since it won't
+ * be needed for listing.
+ */
+ userspace_probe_location =
+ lttng_userspace_probe_location_copy(location);
+ ret = lttng_userspace_probe_location_function_set_binary_fd(
+ userspace_probe_location, -1);
+ if (ret) {
+ goto error;
+ }
+ 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. Close its FD since it won't be needed for listing.
+ */
+ userspace_probe_location =
+ lttng_userspace_probe_location_copy(location);
+ ret = lttng_userspace_probe_location_tracepoint_set_binary_fd(
+ userspace_probe_location, -1);
+ if (ret) {
+ goto error;
+ }
+ break;
+ default:
+ DBG("Unsupported lookup method type");
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+ break;
+ }
case LTTNG_EVENT_FUNCTION:
attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
attr->u.kretprobe.addr = ev->attr.probe.addr;
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 ret;
}
+/*
+ * Allocate and initialize a kernel token event rule.
+ *
+ * Return pointer to structure or NULL.
+ */
+enum lttng_error_code trace_kernel_create_token_event_rule(
+ struct lttng_event_rule *event_rule,
+ uint64_t token,
+ struct ltt_kernel_token_event_rule **kernel_token_event_rule)
+{
+ enum lttng_error_code ret = LTTNG_OK;
+ struct ltt_kernel_token_event_rule *local_kernel_token_event_rule;
+
+ assert(kernel_token_event_rule);
+
+ local_kernel_token_event_rule = zmalloc(sizeof(struct ltt_kernel_token_event_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;
+
+ /* Get the reference of the event rule */
+ if (!lttng_event_rule_get(event_rule)) {
+ assert(0);
+ }
+
+ local_kernel_token_event_rule->event_rule = event_rule;
+ /* The event rule still own the filter and bytecode */
+ local_kernel_token_event_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule);
+
+ DBG3("[trace] Kernel token event rule %" PRIu64 " allocated", local_kernel_token_event_rule->token);
+error:
+ *kernel_token_event_rule = local_kernel_token_event_rule;
+ return ret;
+
+}
+
+/*
+ * Initialize a kernel trigger from an event rule.
+ */
+enum lttng_error_code trace_kernel_init_trigger_from_event_rule(const struct lttng_event_rule *rule,
+ struct lttng_kernel_trigger *kernel_trigger)
+{
+ enum lttng_error_code ret;
+ enum lttng_event_rule_status status;
+ const char *name = NULL;
+
+ /* TODO: do this for now but have disucssion on if this could be the
+ * responsability of the event_rule itself ala
+ * "lttng_even_rule_generate_kernel_trigger"
+ */
+ switch (lttng_event_rule_get_type(rule)) {
+ case LTTNG_EVENT_RULE_TYPE_KPROBE:
+ kernel_trigger->instrumentation = LTTNG_KERNEL_KPROBE;
+ kernel_trigger->u.kprobe.addr = lttng_event_rule_kprobe_get_address(rule);
+ kernel_trigger->u.kprobe.offset = lttng_event_rule_kprobe_get_offset(rule);
+ strncpy(kernel_trigger->u.kprobe.symbol_name,
+ lttng_event_rule_kprobe_get_symbol_name(rule), LTTNG_KERNEL_SYM_NAME_LEN);
+ kernel_trigger->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ (void) lttng_event_rule_kprobe_get_name(rule, &name);
+ ret = LTTNG_OK;
+ break;
+ case LTTNG_EVENT_RULE_TYPE_UPROBE:
+ {
+ const struct lttng_userspace_probe_location* location = NULL;
+ const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
+
+ status = lttng_event_rule_uprobe_get_location(rule, &location);
+ if (status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ kernel_trigger->instrumentation = LTTNG_KERNEL_UPROBE;
+
+ /*
+ * Only the elf lookup method is supported at the moment.
+ */
+ 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. */
+ kernel_trigger->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_trigger->u.uprobe.fd =
+ lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
+ break;
+ default:
+ DBG("Unsupported lookup method type");
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto error;
+ }
+
+ (void) lttng_event_rule_uprobe_get_name(rule, &name);
+
+ ret = LTTNG_OK;
+ break;
+ }
+ case LTTNG_EVENT_RULE_TYPE_KRETPROBE:
+ assert("Not supported" && 0);
+ kernel_trigger->instrumentation = LTTNG_KERNEL_KRETPROBE;
+ kernel_trigger->u.kretprobe.addr = lttng_event_rule_kretprobe_get_address(rule);
+ kernel_trigger->u.kretprobe.offset = lttng_event_rule_kretprobe_get_offset(rule);
+ strncpy(kernel_trigger->u.kretprobe.symbol_name,
+ lttng_event_rule_kretprobe_get_symbol_name(rule), LTTNG_KERNEL_SYM_NAME_LEN);
+ kernel_trigger->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ (void) lttng_event_rule_kretprobe_get_name(rule, &name);
+ ret = LTTNG_OK;
+ break;
+ case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
+ /* TODO: assert his is a kernel domain event-rule */
+ kernel_trigger->instrumentation = LTTNG_KERNEL_TRACEPOINT;
+ (void) lttng_event_rule_tracepoint_get_pattern(rule, &name);
+ ret = LTTNG_OK;
+ break;
+ case LTTNG_EVENT_RULE_TYPE_SYSCALL:
+ kernel_trigger->instrumentation = LTTNG_KERNEL_SYSCALL;
+ (void) lttng_event_rule_syscall_get_pattern(rule, &name);
+ ret = LTTNG_OK;
+ break;
+ default:
+ ERR("Unknown kernel event rule instrumentation type (%d)", lttng_event_rule_get_type(rule));
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ /*
+ * WTF is LTTNG_EVENT_ALL??? and LTTNG_EVENT_FUNTION_ENTRY?????
+ */
+
+ /* Copy event name */
+ strncpy(kernel_trigger->name, name, LTTNG_KERNEL_SYM_NAME_LEN);
+ kernel_trigger->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+
+error:
+ return ret;
+}
/*
* Allocate and initialize a kernel metadata.
*
free(event);
}
+/*
+ * Cleanup kernel event structure.
+ */
+void trace_kernel_destroy_token_event_rule(struct ltt_kernel_token_event_rule *event)
+{
+ /* TODO: review in depth to ensure adequate disposing */
+ assert(event);
+
+ /* Remove from event list */
+ cds_list_del(&event->list);
+
+ if (event->fd >= 0) {
+ int ret;
+
+ DBG("[trace] Closing ,token event rule fd %d", event->fd);
+ /* Close kernel fd */
+ ret = close(event->fd);
+ if (ret) {
+ PERROR("close");
+ }
+ } else {
+ DBG("[trace] Tearing down token event rule (no associated fd)");
+ }
+
+ lttng_event_rule_put(event->event_rule);
+ free(event);
+}
/*
* Cleanup kernel context structure.
*/
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);
+ lttng_tracker_list_destroy(session->tracker_list_pid);
+ lttng_tracker_list_destroy(session->tracker_list_vpid);
+ lttng_tracker_list_destroy(session->tracker_list_uid);
+ lttng_tracker_list_destroy(session->tracker_list_vuid);
+ lttng_tracker_list_destroy(session->tracker_list_gid);
+ lttng_tracker_list_destroy(session->tracker_list_vgid);
+
free(session);
}
projects / lttng-tools.git / blobdiff