/*
* ust-core.c
*
* Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* 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; only
* version 2.1 of the License.
*
* 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
*/
#include <stdlib.h>
#include <lttng/ust-events.h>
#include <usterr-signal-safe.h>
#include "lttng-tracer-core.h"
#include "jhash.h"
static CDS_LIST_HEAD(lttng_transport_list);
struct lttng_transport *lttng_transport_find(const char *name)
{
struct lttng_transport *transport;
cds_list_for_each_entry(transport, <tng_transport_list, node) {
if (!strcmp(transport->name, name))
return transport;
}
return NULL;
}
/**
* lttng_transport_register - LTT transport registration
* @transport: transport structure
*
* Registers a transport which can be used as output to extract the data out of
* LTTng. Called with ust_lock held.
*/
void lttng_transport_register(struct lttng_transport *transport)
{
cds_list_add_tail(&transport->node, <tng_transport_list);
}
/**
* lttng_transport_unregister - LTT transport unregistration
* @transport: transport structure
* Called with ust_lock held.
*/
void lttng_transport_unregister(struct lttng_transport *transport)
{
cds_list_del(&transport->node);
}
/*
* Needed by comm layer.
*/
struct lttng_enum *lttng_ust_enum_get(struct lttng_session *session,
const char *enum_name)
{
struct lttng_enum *_enum;
struct cds_hlist_head *head;
struct cds_hlist_node *node;
size_t name_len = strlen(enum_name);
uint32_t hash;
hash = jhash(enum_name, name_len, 0);
head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)];
cds_hlist_for_each_entry(_enum, node, head, hlist) {
assert(_enum->desc);
if (!strncmp(_enum->desc->name, enum_name,
LTTNG_UST_SYM_NAME_LEN - 1))
return _enum;
}
return NULL;
}
size_t lttng_ust_dummy_get_size(struct lttng_ctx_field *field, size_t offset)
{
size_t size = 0;
size += lib_ring_buffer_align(offset, lttng_alignof(char));
size += sizeof(char); /* tag */
return size;
}
void lttng_ust_dummy_record(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
char sel_char = (char) LTTNG_UST_DYNAMIC_TYPE_NONE;
lib_ring_buffer_align_ctx(ctx, lttng_alignof(sel_char));
chan->ops->event_write(ctx, &sel_char, sizeof(sel_char));
}
void lttng_ust_dummy_get_value(struct lttng_ctx_field *field,
struct lttng_ctx_value *value)
{
value->sel = LTTNG_UST_DYNAMIC_TYPE_NONE;
}
int lttng_context_is_app(const char *name)
{
if (strncmp(name, "$app.", strlen("$app.")) != 0) {
return 0;
}
return 1;
}