SoW-2019-0002: Dynamic Snapshot

[deliverable/lttng-ust.git] / liblttng-ust-ctl / ustctl.c

diff --git a/liblttng-ust-ctl/ustctl.c b/liblttng-ust-ctl/ustctl.c
index 4067758254438c45e2db0363ba55ee8d5d2f08a0..405231b296bb5227dd934ea4e4612a90facf9836 100644 (file)
--- a/liblttng-ust-ctl/ustctl.c
+++ b/liblttng-ust-ctl/ustctl.c
@@ -17,14 +17,16 @@
  */
 
 #define _GNU_SOURCE
+#include <byteswap.h>
+#include <stdint.h>
 #include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
 #include <lttng/ust-config.h>
 #include <lttng/ust-ctl.h>
 #include <lttng/ust-abi.h>
 #include <lttng/ust-events.h>
-#include <sys/mman.h>
-#include <byteswap.h>
-
 #include <usterr-signal-safe.h>
 #include <ust-comm.h>
 #include <helper.h>
@@ -34,6 +36,7 @@
 #include "../liblttng-ust/wait.h"
 #include "../liblttng-ust/lttng-rb-clients.h"
 #include "../liblttng-ust/clock.h"
+#include "../liblttng-ust/getenv.h"
 
 /*
  * Number of milliseconds to retry before failing metadata writes on
@@ -76,8 +79,6 @@ extern void lttng_ring_buffer_client_discard_exit(void);
 extern void lttng_ring_buffer_client_discard_rt_exit(void);
 extern void lttng_ring_buffer_metadata_client_exit(void);
 
-volatile enum ust_loglevel ust_loglevel;
-
 int ustctl_release_handle(int sock, int handle)
 {
        struct ustcomm_ust_msg lum;
@@ -131,6 +132,8 @@ int ustctl_release_object(int sock, struct lttng_ust_object_data *data)
                break;
        case LTTNG_UST_OBJECT_TYPE_EVENT:
        case LTTNG_UST_OBJECT_TYPE_CONTEXT:
+       case LTTNG_UST_OBJECT_TYPE_TRIGGER_GROUP:
+       case LTTNG_UST_OBJECT_TYPE_TRIGGER:
                break;
        default:
                assert(0);
@@ -417,6 +420,91 @@ int ustctl_stop_session(int sock, int handle)
        return ustctl_disable(sock, &obj);
 }
 
+int ustctl_create_trigger_group(int sock, int pipe_fd,
+               struct lttng_ust_object_data **_trigger_group_data)
+{
+       struct lttng_ust_object_data *trigger_group_data;
+       struct ustcomm_ust_msg lum;
+       struct ustcomm_ust_reply lur;
+       ssize_t len;
+       int ret;
+
+       if (!_trigger_group_data)
+               return -EINVAL;
+
+       trigger_group_data = zmalloc(sizeof(*trigger_group_data));
+       if (!trigger_group_data)
+               return -ENOMEM;
+
+       trigger_group_data->type = LTTNG_UST_OBJECT_TYPE_TRIGGER_GROUP;
+
+       memset(&lum, 0, sizeof(lum));
+       lum.handle = LTTNG_UST_ROOT_HANDLE;
+       lum.cmd = LTTNG_UST_TRIGGER_GROUP_CREATE;
+
+       ret = ustcomm_send_app_msg(sock, &lum);
+       if (ret) {
+               return ret;
+       }
+
+       /* Send trigger notification pipe. */
+       len = ustcomm_send_fds_unix_sock(sock, &pipe_fd, 1);
+       if (len <= 0) {
+               return ret;
+       }
+
+       ret = ustcomm_recv_app_reply(sock, &lur, lum.handle, lum.cmd);
+       if (ret) {
+               return ret;
+       }
+
+       trigger_group_data->handle = lur.ret_val;
+       DBG("received trigger group handle %d", trigger_group_data->handle);
+
+       *_trigger_group_data = trigger_group_data;
+       return 0;
+}
+
+int ustctl_create_trigger(int sock, struct lttng_ust_trigger *trigger,
+               struct lttng_ust_object_data *trigger_group,
+               struct lttng_ust_object_data **_trigger_data)
+{
+       struct ustcomm_ust_msg lum;
+       struct ustcomm_ust_reply lur;
+       struct lttng_ust_object_data *trigger_data;
+       int ret;
+
+       if (!trigger_group || !_trigger_data)
+               return -EINVAL;
+
+       trigger_data = zmalloc(sizeof(*trigger_data));
+       if (!trigger_data)
+               return -ENOMEM;
+
+       trigger_data->type = LTTNG_UST_OBJECT_TYPE_TRIGGER;
+
+       memset(&lum, 0, sizeof(lum));
+       lum.handle = trigger_group->handle;
+       lum.cmd = LTTNG_UST_TRIGGER_CREATE;
+
+       strncpy(lum.u.trigger.name, trigger->name,
+               LTTNG_UST_SYM_NAME_LEN);
+       lum.u.trigger.instrumentation = trigger->instrumentation;
+       lum.u.trigger.loglevel_type = trigger->loglevel_type;
+       lum.u.trigger.loglevel = trigger->loglevel;
+       lum.u.trigger.id = trigger->id;
+       ret = ustcomm_send_app_cmd(sock, &lum, &lur);
+       if (ret) {
+               free(trigger_data);
+               return ret;
+       }
+       trigger_data->handle = lur.ret_val;
+       DBG("received event handle %u", trigger_data->handle);
+       *_trigger_data = trigger_data;
+
+       return ret;
+}
+
 int ustctl_tracepoint_list(int sock)
 {
        struct ustcomm_ust_msg lum;
@@ -1056,7 +1144,8 @@ struct ustctl_consumer_channel *
                        attr->switch_timer_interval,
                        attr->read_timer_interval,
                        attr->uuid, attr->chan_id,
-                       stream_fds, nr_stream_fds);
+                       stream_fds, nr_stream_fds,
+                       attr->blocking_timeout);
        if (!chan->chan) {
                goto chan_error;
        }
@@ -1500,6 +1589,25 @@ int ustctl_snapshot(struct ustctl_consumer_stream *stream)
                        &buf->prod_snapshot, consumer_chan->chan->handle);
 }
 
+/*
+ * Get a snapshot of the current ring buffer producer and consumer positions
+ * even if the consumed and produced positions are contained within the same
+ * subbuffer.
+ */
+int ustctl_snapshot_sample_positions(struct ustctl_consumer_stream *stream)
+{
+       struct lttng_ust_lib_ring_buffer *buf;
+       struct ustctl_consumer_channel *consumer_chan;
+
+       if (!stream)
+               return -EINVAL;
+       buf = stream->buf;
+       consumer_chan = stream->chan;
+       return lib_ring_buffer_snapshot_sample_positions(buf,
+                       &buf->cons_snapshot, &buf->prod_snapshot,
+                       consumer_chan->chan->handle);
+}
+
 /* Get the consumer position (iteration start) */
 int ustctl_snapshot_get_consumed(struct ustctl_consumer_stream *stream,
                unsigned long *pos)
@@ -1569,6 +1677,19 @@ void ustctl_flush_buffer(struct ustctl_consumer_stream *stream,
                consumer_chan->chan->handle);
 }
 
+void ustctl_clear_buffer(struct ustctl_consumer_stream *stream)
+{
+       struct lttng_ust_lib_ring_buffer *buf;
+       struct ustctl_consumer_channel *consumer_chan;
+
+       assert(stream);
+       buf = stream->buf;
+       consumer_chan = stream->chan;
+       lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE,
+               consumer_chan->chan->handle);
+       lib_ring_buffer_clear_reader(buf, consumer_chan->chan->handle);
+}
+
 static
 struct lttng_ust_client_lib_ring_buffer_client_cb *get_client_cb(
                struct lttng_ust_lib_ring_buffer *buf,