ustctl: Implement ring buffer clear

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

diff --git a/liblttng-ust-ctl/ustctl.c b/liblttng-ust-ctl/ustctl.c
index fcb6f0d55c398f2cc534d7f8aa27c5f4e21b5657..949ece17ace8a2d8ec2a2d624b0451fd5ee83313 100644 (file)
--- a/liblttng-ust-ctl/ustctl.c
+++ b/liblttng-ust-ctl/ustctl.c
@@ -18,6 +18,7 @@
 
 #define _GNU_SOURCE
 #include <string.h>
+#include <lttng/ust-config.h>
 #include <lttng/ust-ctl.h>
 #include <lttng/ust-abi.h>
 #include <lttng/ust-events.h>
@@ -33,6 +34,7 @@
 #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
@@ -1055,7 +1057,8 @@ 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;
        }
@@ -1499,6 +1502,25 @@ 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)
@@ -1568,6 +1590,19 @@ 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,
@@ -1725,7 +1760,24 @@ int ustctl_get_sequence_number(struct ustctl_consumer_stream *stream,
        return client_cb->sequence_number(buf, handle, seq);
 }
 
-#if defined(__x86_64__) || defined(__i386__)
+int ustctl_get_instance_id(struct ustctl_consumer_stream *stream,
+               uint64_t *id)
+{
+       struct lttng_ust_client_lib_ring_buffer_client_cb *client_cb;
+       struct lttng_ust_lib_ring_buffer *buf;
+       struct lttng_ust_shm_handle *handle;
+
+       if (!stream || !id)
+               return -EINVAL;
+       buf = stream->buf;
+       handle = stream->chan->chan->handle;
+       client_cb = get_client_cb(buf, handle);
+       if (!client_cb)
+               return -ENOSYS;
+       return client_cb->instance_id(buf, handle, id);
+}
+
+#ifdef LTTNG_UST_HAVE_PERF_EVENT
 
 int ustctl_has_perf_counters(void)
 {
@@ -2166,10 +2218,28 @@ int ustctl_reply_register_channel(int sock,
        return 0;
 }
 
+/* Regenerate the statedump. */
+int ustctl_regenerate_statedump(int sock, int handle)
+{
+       struct ustcomm_ust_msg lum;
+       struct ustcomm_ust_reply lur;
+       int ret;
+
+       memset(&lum, 0, sizeof(lum));
+       lum.handle = handle;
+       lum.cmd = LTTNG_UST_SESSION_STATEDUMP;
+       ret = ustcomm_send_app_cmd(sock, &lum, &lur);
+       if (ret)
+               return ret;
+       DBG("Regenerated statedump for handle %u", handle);
+       return 0;
+}
+
 static __attribute__((constructor))
 void ustctl_init(void)
 {
        init_usterr();
+       lttng_ust_getenv_init();        /* Needs init_usterr() to be completed. */
        lttng_ust_clock_init();
        lttng_ring_buffer_metadata_client_init();
        lttng_ring_buffer_client_overwrite_init();