#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
#include <unistd.h>
#include <urcu/list.h> /* URCU list library (-lurcu) */
-#include <ust/ustctl.h> /* UST control lib (-lust) */
#include <lttng/lttng.h>
#include "liblttsessiondcomm.h"
#include "session.h"
#include "traceable-app.h"
#include "lttng-kconsumerd.h"
+#include "libustctl.h"
/*
* TODO:
// TODO complete session cleanup (including UST)
}
+ DBG("Closing kernel fd");
close(kernel_tracer_fd);
}
}
}
+/*
+ * send_kconsumerd_fds
+ *
+ * Send all stream fds of the kernel session to the consumer.
+ */
+static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
+{
+ int ret;
+ size_t nb_fd;
+ struct ltt_kernel_stream *stream;
+ struct ltt_kernel_channel *chan;
+ struct lttcomm_kconsumerd_header lkh;
+ struct lttcomm_kconsumerd_msg lkm;
+
+ nb_fd = session->stream_count_global;
+
+ /* Setup header */
+ lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg);
+ lkh.cmd_type = ADD_STREAM;
+
+ DBG("Sending kconsumerd header");
+
+ ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
+ if (ret < 0) {
+ perror("send kconsumerd header");
+ goto error;
+ }
+
+ DBG("Sending metadata stream fd");
+
+ /* Send metadata stream fd first */
+ lkm.fd = session->metadata_stream_fd;
+ lkm.state = ACTIVE_FD;
+ lkm.max_sb_size = session->metadata->conf->attr.subbuf_size;
+ strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
+
+ ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
+ if (ret < 0) {
+ perror("send kconsumerd fd");
+ goto error;
+ }
+
+ cds_list_for_each_entry(chan, &session->channel_list.head, list) {
+ cds_list_for_each_entry(stream, &chan->stream_list.head, list) {
+ lkm.fd = stream->fd;
+ lkm.state = stream->state;
+ lkm.max_sb_size = chan->channel->attr.subbuf_size;
+ strncpy(lkm.path_name, stream->pathname, PATH_MAX);
+
+ DBG("Sending fd %d to kconsumerd", lkm.fd);
+
+ ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
+ if (ret < 0) {
+ perror("send kconsumerd fd");
+ goto error;
+ }
+ }
+ }
+
+ DBG("Kconsumerd fds sent");
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * create_trace_dir
+ *
+ * Create the trace output directory.
+ */
+static int create_trace_dir(struct ltt_kernel_session *session)
+{
+ int ret;
+ struct ltt_kernel_channel *chan;
+
+ /* Create all channel directories */
+ cds_list_for_each_entry(chan, &session->channel_list.head, list) {
+ DBG("Creating trace directory at %s", chan->pathname);
+ // TODO: recursive create dir
+ ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG );
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ perror("mkdir trace path");
+ ret = -errno;
+ goto error;
+ }
+ }
+ }
+
+ return 0;
+
+error:
+ return ret;
+}
+
/*
* ust_connect_app
*
sock = ustctl_connect_pid(lta->pid);
if (sock < 0) {
- ERR("Fail connecting to the PID %d\n", pid);
+ ERR("Fail connecting to the PID %d", pid);
}
return sock;
*/
static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
{
- int ret, buf_size, trace_name_size;
+ int ret, buf_size;
- /*
- * Check for the trace_name. If defined, it's part of the payload data of
- * the llm structure.
- */
- trace_name_size = strlen(cmd_ctx->lsm->trace_name);
- buf_size = trace_name_size + size;
+ buf_size = size;
cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
if (cmd_ctx->llm == NULL) {
/* Copy common data */
cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
- if (!uuid_is_null(cmd_ctx->lsm->session_uuid)) {
- uuid_copy(cmd_ctx->llm->session_uuid, cmd_ctx->lsm->session_uuid);
- }
- cmd_ctx->llm->trace_name_offset = trace_name_size;
cmd_ctx->llm->data_size = size;
cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
- /* Copy trace name to the llm structure. Begining of the payload. */
- memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size);
-
return buf_size;
error:
/*
* Exec kconsumerd.
*/
- execlp("kconsumerd", "kconsumerd", "--quiet", NULL);
+ execlp("kconsumerd", "kconsumerd", "--verbose", NULL);
if (errno != 0) {
perror("kernel start consumer exec");
}
}
/*
- * send_kconsumerd_fds
+ * init_kernel_tracer
*
- * Send all stream fds of the kernel session to the consumer.
+ * Setup necessary data for kernel tracer action.
*/
-static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
+static void init_kernel_tracer(void)
{
- int ret;
- size_t nb_fd;
- struct ltt_kernel_stream *stream;
- struct ltt_kernel_channel *chan;
- struct lttcomm_kconsumerd_header lkh;
- struct lttcomm_kconsumerd_msg lkm;
-
- nb_fd = session->stream_count_global;
+ /* Set the global kernel tracer fd */
+ kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
+ if (kernel_tracer_fd < 0) {
+ WARN("No kernel tracer available");
+ kernel_tracer_fd = 0;
+ }
- /* Setup header */
- lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg);
- lkh.cmd_type = ADD_STREAM;
+ DBG("Kernel tracer fd %d", kernel_tracer_fd);
+}
- DBG("Sending kconsumerd header");
+/*
+ * start_kernel_trace
+ *
+ * Start tracing by creating trace directory and sending FDs to the kernel
+ * consumer.
+ */
+static int start_kernel_trace(struct ltt_kernel_session *session)
+{
+ int ret;
- ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
+ /* Create trace directory */
+ ret = create_trace_dir(session);
if (ret < 0) {
- perror("send kconsumerd header");
- goto error;
+ if (ret == -EEXIST) {
+ ret = LTTCOMM_KERN_DIR_EXIST;
+ } else {
+ ret = LTTCOMM_KERN_DIR_FAIL;
+ goto error;
+ }
}
- DBG("Sending metadata stream fd");
-
- /* Send metadata stream fd first */
- lkm.fd = session->metadata_stream_fd;
- lkm.state = ACTIVE_FD;
- lkm.max_sb_size = session->metadata->conf->subbuf_size;
- strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
+ if (session->kconsumer_fds_sent == 0) {
+ ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session);
+ if (ret < 0) {
+ ERR("Send kconsumerd fds failed");
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ goto error;
+ }
- ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
- if (ret < 0) {
- perror("send kconsumerd fd");
- goto error;
+ session->kconsumer_fds_sent = 1;
}
- cds_list_for_each_entry(chan, &session->channel_list.head, list) {
- cds_list_for_each_entry(stream, &chan->stream_list.head, list) {
- lkm.fd = stream->fd;
- lkm.state = stream->state;
- lkm.max_sb_size = chan->channel->subbuf_size;
- strncpy(lkm.path_name, stream->pathname, PATH_MAX);
+error:
+ return ret;
+}
- DBG("Sending fd %d to kconsumerd", lkm.fd);
+/*
+ * init_default_channel
+ *
+ * Allocate a channel structure and fill it.
+ */
+static struct lttng_channel *init_default_channel(void)
+{
+ struct lttng_channel *chan;
- ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
- if (ret < 0) {
- perror("send kconsumerd fd");
- goto error;
- }
- }
+ chan = malloc(sizeof(struct lttng_channel));
+ if (chan == NULL) {
+ perror("init channel malloc");
+ goto error;
}
- DBG("Kconsumerd fds sent");
+ if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) {
+ perror("snprintf defautl channel name");
+ return NULL;
+ }
- return 0;
+ chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
+ chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
+ chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+ chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+ chan->attr.output = DEFAULT_CHANNEL_OUTPUT;
error:
- return ret;
+ return chan;
}
/*
- * create_trace_dir
+ * create_kernel_session
*
- * Create the trace output directory.
+ * Create a kernel tracer session then create the default channel.
*/
-static int create_trace_dir(struct ltt_kernel_session *session)
+static int create_kernel_session(struct ltt_session *session)
{
int ret;
- struct ltt_kernel_channel *chan;
+ struct lttng_channel *chan;
- /* Create all channel directories */
- cds_list_for_each_entry(chan, &session->channel_list.head, list) {
- DBG("Creating trace directory at %s", chan->pathname);
- ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG );
- if (ret < 0) {
- perror("mkdir trace path");
- ret = -errno;
- goto error;
- }
+ DBG("Creating kernel session");
+
+ ret = kernel_create_session(session, kernel_tracer_fd);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
}
- return 0;
+ chan = init_default_channel();
+ if (chan == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME);
+
+ ret = kernel_create_channel(session->kernel_session, chan);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto error;
+ }
error:
return ret;
DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
- /* Check command that needs a session */
+ /* Listing commands don't need a session */
switch (cmd_ctx->lsm->cmd_type) {
case LTTNG_CREATE_SESSION:
case LTTNG_LIST_SESSIONS:
- case KERNEL_LIST_EVENTS:
- case UST_LIST_APPS:
+ case LTTNG_LIST_EVENTS:
+ case LTTNG_KERNEL_LIST_EVENTS:
+ case LTTNG_LIST_TRACEABLE_APPS:
break;
default:
- cmd_ctx->session = find_session_by_uuid(cmd_ctx->lsm->session_uuid);
+ DBG("Getting session %s by name", cmd_ctx->lsm->session_name);
+ cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name);
if (cmd_ctx->session == NULL) {
- ret = LTTCOMM_SELECT_SESS;
+ /* If session name not found */
+ if (cmd_ctx->lsm->session_name != NULL) {
+ ret = LTTCOMM_SESS_NOT_FOUND;
+ } else { /* If no session name specified */
+ ret = LTTCOMM_SELECT_SESS;
+ }
goto error;
}
break;
}
- /* Check command for kernel tracing */
+ /*
+ * Check kernel command for kernel session.
+ */
switch (cmd_ctx->lsm->cmd_type) {
- case KERNEL_CREATE_SESSION:
- case KERNEL_CREATE_CHANNEL:
- case KERNEL_CREATE_STREAM:
- case KERNEL_DISABLE_EVENT:
- case KERNEL_ENABLE_EVENT:
- case KERNEL_LIST_EVENTS:
- case KERNEL_OPEN_METADATA:
- case KERNEL_START_TRACE:
- case KERNEL_STOP_TRACE:
- /* TODO: reconnect to kernel tracer to check if
- * it's loadded */
+ case LTTNG_KERNEL_ADD_CONTEXT:
+ case LTTNG_KERNEL_CREATE_CHANNEL:
+ case LTTNG_KERNEL_DISABLE_ALL_EVENT:
+ case LTTNG_KERNEL_DISABLE_CHANNEL:
+ case LTTNG_KERNEL_DISABLE_EVENT:
+ case LTTNG_KERNEL_ENABLE_ALL_EVENT:
+ case LTTNG_KERNEL_ENABLE_CHANNEL:
+ case LTTNG_KERNEL_ENABLE_EVENT:
+ case LTTNG_KERNEL_LIST_EVENTS:
+ /* Kernel tracer check */
if (kernel_tracer_fd == 0) {
- ret = LTTCOMM_KERN_NA;
- goto error;
+ init_kernel_tracer();
+ if (kernel_tracer_fd == 0) {
+ ret = LTTCOMM_KERN_NA;
+ goto error;
+ }
+ }
+
+ /* Need a session for kernel command */
+ if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS &&
+ cmd_ctx->session->kernel_session == NULL) {
+
+ ret = create_kernel_session(cmd_ctx->session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
+ }
+
+ /* Start the kernel consumer daemon */
+ if (kconsumerd_pid == 0) {
+ ret = start_kconsumerd();
+ if (ret < 0) {
+ goto error;
+ }
+ }
}
- break;
}
/* Connect to ust apps if available pid */
/* Process by command type */
switch (cmd_ctx->lsm->cmd_type) {
- case KERNEL_CREATE_SESSION:
+ case LTTNG_KERNEL_ADD_CONTEXT:
+ {
+ int found = 0, no_event = 0;
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *event;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Check if event name is given */
+ if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) {
+ no_event = 1;
+ }
+
+ if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) {
+ /* Go over all channels */
+ DBG("Adding context to all channels");
+ cds_list_for_each_entry(chan,
+ &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ if (no_event) {
+ ret = kernel_add_channel_context(chan,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ continue;
+ }
+ } else {
+ event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
+ if (event != NULL) {
+ ret = kernel_add_event_context(event,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ found = 1;
+ break;
+ }
+ }
+ }
+ } else {
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ if (no_event) {
+ ret = kernel_add_channel_context(chan,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ } else {
+ event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
+ if (event != NULL) {
+ ret = kernel_add_event_context(event,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ }
+ }
+ }
+
+ if (!found && !no_event) {
+ ret = LTTCOMM_NO_EVENT;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_CREATE_CHANNEL:
{
+ /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
- ret = start_kconsumerd();
+ /* Kernel tracer */
+ DBG("Creating kernel channel");
+
+ ret = kernel_create_channel(cmd_ctx->session->kernel_session,
+ &cmd_ctx->lsm->u.channel.chan);
if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
goto error;
}
- DBG("Creating kernel session");
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_CHANNEL:
+ {
+ struct ltt_kernel_channel *chan;
- ret = kernel_create_session(cmd_ctx->session, kernel_tracer_fd);
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
- ret = LTTCOMM_KERN_SESS_FAIL;
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
goto error;
+ } else if (chan->enabled == 1) {
+ ret = kernel_disable_channel(chan);
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
+ }
+ goto error;
+ }
}
+ kernel_wait_quiescent(kernel_tracer_fd);
ret = LTTCOMM_OK;
break;
}
- case KERNEL_CREATE_CHANNEL:
+ case LTTNG_KERNEL_DISABLE_EVENT:
{
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
- DBG("Creating kernel channel");
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan);
+ if (ev != NULL) {
+ DBG("Disabling kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name);
+ ret = kernel_disable_event(ev);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_ALL_EVENT:
+ {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Disabling all enabled kernel events");
- ret = kernel_create_channel(cmd_ctx->session->kernel_session);
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+ /* For each event in the kernel session */
+ cds_list_for_each_entry(ev, &chan->events_list.head, list) {
+ DBG("Disabling kernel event %s for channel %s.",
+ ev->event->name, cmd_ctx->lsm->u.disable.channel_name);
+ ret = kernel_disable_event(ev);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
+ /* Quiescent wait after event disable */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_ENABLE_CHANNEL:
+ {
+ struct ltt_kernel_channel *chan;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
- ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
goto error;
+ } else if (chan->enabled == 0) {
+ ret = kernel_enable_channel(chan);
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
+ }
+ goto error;
+ }
}
+ kernel_wait_quiescent(kernel_tracer_fd);
ret = LTTCOMM_OK;
break;
}
- case KERNEL_ENABLE_EVENT:
+ case LTTNG_KERNEL_ENABLE_EVENT:
{
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
/* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
- DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name);
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan);
+ if (ev == NULL) {
+ DBG("Creating kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
+ ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan);
+ } else {
+ DBG("Enabling kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
+ ret = kernel_enable_event(ev);
+ }
- ret = kernel_enable_event(cmd_ctx->session->kernel_session, cmd_ctx->lsm->u.event.event_name);
if (ret < 0) {
ret = LTTCOMM_KERN_ENABLE_FAIL;
goto error;
}
+ kernel_wait_quiescent(kernel_tracer_fd);
ret = LTTCOMM_OK;
break;
}
- case KERNEL_ENABLE_ALL_EVENT:
+ case LTTNG_KERNEL_ENABLE_ALL_EVENT:
{
int pos, size;
char *event_list, *event, *ptr;
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+ struct lttng_event ev_attr;
/* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
DBG("Enabling all kernel event");
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ /* For each event in the kernel session */
+ cds_list_for_each_entry(ev, &chan->events_list.head, list) {
+ DBG("Enabling kernel event %s for channel %s.",
+ ev->event->name, chan->channel->name);
+ ret = kernel_enable_event(ev);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
size = kernel_list_events(kernel_tracer_fd, &event_list);
if (size < 0) {
ret = LTTCOMM_KERN_LIST_FAIL;
ptr = event_list;
while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
- /* Enable each single event */
- ret = kernel_enable_event(cmd_ctx->session->kernel_session, event);
- if (ret < 0) {
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- goto error;
+ ev = get_kernel_event_by_name(event, chan);
+ if (ev == NULL) {
+ strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN);
+ /* Default event type for enable all */
+ ev_attr.type = LTTNG_EVENT_TRACEPOINTS;
+ /* Enable each single tracepoint event */
+ ret = kernel_create_event(&ev_attr, chan);
+ if (ret < 0) {
+ /* Ignore error here and continue */
+ }
}
+
/* Move pointer to the next line */
ptr += pos + 1;
free(event);
free(event_list);
+ /* Quiescent wait after event enable */
+ kernel_wait_quiescent(kernel_tracer_fd);
ret = LTTCOMM_OK;
break;
}
- case KERNEL_LIST_EVENTS:
+ case LTTNG_KERNEL_LIST_EVENTS:
{
char *event_list;
- ssize_t size;
+ ssize_t size = 0;
+
+ DBG("Listing kernel events");
size = kernel_list_events(kernel_tracer_fd, &event_list);
if (size < 0) {
ret = LTTCOMM_OK;
break;
}
- case KERNEL_OPEN_METADATA:
- {
- /* Setup lttng message with no payload */
- ret = setup_lttng_msg(cmd_ctx, 0);
- if (ret < 0) {
- goto setup_error;
- }
-
- DBG("Open kernel metadata");
-
- ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
- if (ret < 0) {
- ret = LTTCOMM_KERN_META_FAIL;
- goto error;
- }
-
- ret = LTTCOMM_OK;
- break;
- }
- case KERNEL_CREATE_STREAM:
+ case LTTNG_START_TRACE:
{
struct ltt_kernel_channel *chan;
+
/* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
- DBG("Creating kernel stream");
+ /* Kernel tracing */
+ if (cmd_ctx->session->kernel_session != NULL) {
+ if (cmd_ctx->session->kernel_session->metadata == NULL) {
+ DBG("Open kernel metadata");
+ ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_META_FAIL;
+ goto error;
+ }
+ }
- ret = kernel_create_metadata_stream(cmd_ctx->session->kernel_session);
- if (ret < 0) {
- ERR("Kernel create metadata stream failed");
- ret = LTTCOMM_KERN_STREAM_FAIL;
- goto error;
- }
+ if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
+ DBG("Opening kernel metadata stream");
+ if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
+ ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel create metadata stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ }
+ }
- /* For each channel */
- cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
- ret = kernel_create_channel_stream(chan);
+ /* For each channel */
+ cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ if (chan->stream_count == 0) {
+ ret = kernel_open_channel_stream(chan);
+ if (ret < 0) {
+ ERR("Kernel create channel stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ /* Update the stream global counter */
+ cmd_ctx->session->kernel_session->stream_count_global += ret;
+ }
+ }
+
+ DBG("Start kernel tracing");
+ ret = kernel_start_session(cmd_ctx->session->kernel_session);
if (ret < 0) {
- ERR("Kernel create channel stream failed");
- ret = LTTCOMM_KERN_STREAM_FAIL;
+ ERR("Kernel start session failed");
+ ret = LTTCOMM_KERN_START_FAIL;
goto error;
}
- /* Update the stream global counter */
- cmd_ctx->session->kernel_session->stream_count_global += ret;
- }
- ret = LTTCOMM_OK;
- break;
- }
- case KERNEL_START_TRACE:
- {
- /* Setup lttng message with no payload */
- ret = setup_lttng_msg(cmd_ctx, 0);
- if (ret < 0) {
- goto setup_error;
- }
-
- DBG("Start kernel tracing");
-
- ret = create_trace_dir(cmd_ctx->session->kernel_session);
- if (ret < 0) {
- if (ret == -EEXIST) {
- ret = LTTCOMM_KERN_DIR_EXIST;
- } else {
- ret = LTTCOMM_KERN_DIR_FAIL;
+ ret = start_kernel_trace(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_START_FAIL;
goto error;
}
- }
- ret = kernel_start_session(cmd_ctx->session->kernel_session);
- if (ret < 0) {
- ERR("Kernel start session failed");
- ret = LTTCOMM_KERN_START_FAIL;
- goto error;
+ /* Quiescent wait after starting trace */
+ kernel_wait_quiescent(kernel_tracer_fd);
}
- ret = send_kconsumerd_fds(kconsumerd_cmd_sock, cmd_ctx->session->kernel_session);
- if (ret < 0) {
- ERR("Send kconsumerd fds failed");
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
+ /* TODO: Start all UST traces */
ret = LTTCOMM_OK;
break;
}
- case KERNEL_STOP_TRACE:
+ case LTTNG_STOP_TRACE:
{
+ struct ltt_kernel_channel *chan;
/* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
- if (cmd_ctx->session->kernel_session == NULL) {
- ret = LTTCOMM_KERN_NO_SESSION;
- goto error;
- }
+ /* Kernel tracer */
+ if (cmd_ctx->session->kernel_session != NULL) {
+ DBG("Stop kernel tracing");
- DBG("Stop kernel tracing");
+ ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd);
+ if (ret < 0) {
+ ERR("Kernel metadata flush failed");
+ }
- ret = kernel_stop_session(cmd_ctx->session->kernel_session);
- if (ret < 0) {
- ERR("Kernel stop session failed");
- ret = LTTCOMM_KERN_STOP_FAIL;
- goto error;
+ cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ ret = kernel_flush_buffer(chan);
+ if (ret < 0) {
+ ERR("Kernel flush buffer error");
+ }
+ }
+
+ ret = kernel_stop_session(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel stop session failed");
+ ret = LTTCOMM_KERN_STOP_FAIL;
+ goto error;
+ }
+
+ /* Quiescent wait after stopping trace */
+ kernel_wait_quiescent(kernel_tracer_fd);
}
- /* Clean kernel session teardown */
- teardown_kernel_session(cmd_ctx->session);
+ /* TODO : User-space tracer */
ret = LTTCOMM_OK;
break;
goto setup_error;
}
- ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid);
+ ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path);
if (ret < 0) {
- if (ret == -1) {
+ if (ret == -EEXIST) {
ret = LTTCOMM_EXIST_SESS;
} else {
ret = LTTCOMM_FATAL;
goto setup_error;
}
- ret = destroy_session(&cmd_ctx->lsm->session_uuid);
+ /* Clean kernel session teardown */
+ teardown_kernel_session(cmd_ctx->session);
+
+ ret = destroy_session(cmd_ctx->lsm->session_name);
if (ret < 0) {
- ret = LTTCOMM_NO_SESS;
+ ret = LTTCOMM_FATAL;
goto error;
}
ret = LTTCOMM_OK;
break;
}
+ /*
case LTTNG_LIST_TRACES:
{
unsigned int trace_count;
ret = LTTCOMM_OK;
break;
}
+ */
+ /*
case UST_CREATE_TRACE:
{
- /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
ret = ust_create_trace(cmd_ctx);
if (ret < 0) {
- goto setup_error;
+ goto error;
}
break;
}
- case UST_LIST_APPS:
+ */
+ case LTTNG_LIST_TRACEABLE_APPS:
{
unsigned int app_count;
ret = LTTCOMM_OK;
break;
}
+ /*
case UST_START_TRACE:
{
- /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
case UST_STOP_TRACE:
{
- /* Setup lttng message with no payload */
ret = setup_lttng_msg(cmd_ctx, 0);
if (ret < 0) {
goto setup_error;
}
break;
}
+ */
case LTTNG_LIST_SESSIONS:
{
unsigned int session_count;
session_count = get_session_count();
if (session_count == 0) {
- ret = LTTCOMM_NO_SESS;
+ ret = LTTCOMM_NO_SESSION;
goto error;
}
continue;
}
+ // TODO: Validate cmd_ctx including sanity check for security purpose.
+
/*
* This function dispatch the work to the kernel or userspace tracer
* libs and fill the lttcomm_lttng_msg data structure of all the needed
}
clean_command_ctx(cmd_ctx);
+
+ /* End of transmission */
+ close(sock);
}
error:
return ret;
}
-/*
- * init_kernel_tracer
- *
- * Setup necessary data for kernel tracer action.
- */
-static void init_kernel_tracer(void)
-{
- /* Set the global kernel tracer fd */
- kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
- if (kernel_tracer_fd < 0) {
- WARN("No kernel tracer available");
- kernel_tracer_fd = 0;
- }
-
- DBG("Kernel tracer fd %d", kernel_tracer_fd);
-}
-
/*
* set_kconsumerd_sockets
*
ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
if (ret < 0) {
- ERR("Failed to create " KCONSUMERD_PATH);
- goto error;
+ if (errno != EEXIST) {
+ ERR("Failed to create " KCONSUMERD_PATH);
+ goto error;
+ }
+ ret = 0;
}
/* Create the kconsumerd error unix socket */
return ret;
}
+/*
+ * set_ulimit
+ *
+ * Set open files limit to unlimited. This daemon can open a large number of
+ * file descriptors in order to consumer multiple kernel traces.
+ */
+static void set_ulimit(void)
+{
+ int ret;
+ struct rlimit lim;
+
+ lim.rlim_cur = 65535;
+ lim.rlim_max = 65535;
+
+ ret = setrlimit(RLIMIT_NOFILE, &lim);
+ if (ret < 0) {
+ perror("failed to set open files limit");
+ }
+}
+
/*
* main
*/
/* Setup kernel tracer */
init_kernel_tracer();
+
+ /* Set ulimit for open files */
+ set_ulimit();
} else {
if (strlen(apps_unix_sock_path) == 0) {
snprintf(apps_unix_sock_path, PATH_MAX,
projects / lttng-tools.git / blobdiff