Implement dynamic types, and application context provider support

[deliverable/lttng-ust.git] / liblttng-ust / lttng-ring-buffer-client.h

diff --git a/liblttng-ust/lttng-ring-buffer-client.h b/liblttng-ust/lttng-ring-buffer-client.h
index 87d1a8cdb3fe98fca98dcc051e4ab591e65a8269..d219b79c91dfb0ea45658865a97b0dded461ac20 100644 (file)
--- a/liblttng-ust/lttng-ring-buffer-client.h
+++ b/liblttng-ust/lttng-ring-buffer-client.h
@@ -76,8 +76,9 @@ size_t ctx_get_size(size_t offset, struct lttng_ctx *ctx)
 
        if (caa_likely(!ctx))
                return 0;
+       offset += lib_ring_buffer_align(offset, ctx->largest_align);
        for (i = 0; i < ctx->nr_fields; i++)
-               offset += ctx->fields[i].get_size(offset);
+               offset += ctx->fields[i].get_size(&ctx->fields[i], offset);
        return offset - orig_offset;
 }
 
@@ -90,6 +91,7 @@ void ctx_record(struct lttng_ust_lib_ring_buffer_ctx *bufctx,
 
        if (caa_likely(!ctx))
                return;
+       lib_ring_buffer_align_ctx(bufctx, ctx->largest_align);
        for (i = 0; i < ctx->nr_fields; i++)
                ctx->fields[i].record(&ctx->fields[i], bufctx, chan);
 }
@@ -108,7 +110,7 @@ void ctx_record(struct lttng_ust_lib_ring_buffer_ctx *bufctx,
  * contains.
  */
 static __inline__
-unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
+size_t record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
                                 struct channel *chan, size_t offset,
                                 size_t *pre_header_padding,
                                 struct lttng_ust_lib_ring_buffer_ctx *ctx)
@@ -183,7 +185,7 @@ void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *con
                            uint32_t event_id)
 {
        struct lttng_channel *lttng_chan = channel_get_private(ctx->chan);
-       struct lttng_event *event = ctx->priv;
+       struct lttng_stack_ctx *lttng_ctx = ctx->priv2;
 
        if (caa_unlikely(ctx->rflags))
                goto slow_path;
@@ -218,8 +220,8 @@ void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *con
                WARN_ON_ONCE(1);
        }
 
-       ctx_record(ctx, lttng_chan, lttng_chan->ctx);
-       ctx_record(ctx, lttng_chan, event->ctx);
+       ctx_record(ctx, lttng_chan, lttng_ctx->chan_ctx);
+       ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx);
        lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
 
        return;
@@ -234,7 +236,7 @@ void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config
                                 uint32_t event_id)
 {
        struct lttng_channel *lttng_chan = channel_get_private(ctx->chan);
-       struct lttng_event *event = ctx->priv;
+       struct lttng_stack_ctx *lttng_ctx = ctx->priv2;
 
        switch (lttng_chan->header_type) {
        case 1: /* compact */
@@ -291,8 +293,8 @@ void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config
        default:
                WARN_ON_ONCE(1);
        }
-       ctx_record(ctx, lttng_chan, lttng_chan->ctx);
-       ctx_record(ctx, lttng_chan, event->ctx);
+       ctx_record(ctx, lttng_chan, lttng_ctx->chan_ctx);
+       ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx);
        lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
 }
 
@@ -337,6 +339,9 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t
                                handle);
        struct lttng_channel *lttng_chan = channel_get_private(chan);
 
+       assert(header);
+       if (!header)
+               return;
        header->magic = CTF_MAGIC_NUMBER;
        memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid));
        header->stream_id = lttng_chan->id;
@@ -364,6 +369,9 @@ static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t ts
                                handle);
        unsigned long records_lost = 0;
 
+       assert(header);
+       if (!header)
+               return;
        header->ctx.timestamp_end = tsc;
        header->ctx.content_size =
                (uint64_t) data_size * CHAR_BIT;                /* in bits */
@@ -386,6 +394,20 @@ static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf, void *
 {
 }
 
+static void client_content_size_field(const struct lttng_ust_lib_ring_buffer_config *config,
+                                     size_t *offset, size_t *length)
+{
+       *offset = offsetof(struct packet_header, ctx.content_size);
+       *length = sizeof(((struct packet_header *) NULL)->ctx.content_size);
+}
+
+static void client_packet_size_field(const struct lttng_ust_lib_ring_buffer_config *config,
+                                     size_t *offset, size_t *length)
+{
+       *offset = offsetof(struct packet_header, ctx.packet_size);
+       *length = sizeof(((struct packet_header *) NULL)->ctx.packet_size);
+}
+
 static struct packet_header *client_packet_header(struct lttng_ust_lib_ring_buffer *buf,
                struct lttng_ust_shm_handle *handle)
 {
@@ -399,6 +421,8 @@ static int client_timestamp_begin(struct lttng_ust_lib_ring_buffer *buf,
        struct packet_header *header;
 
        header = client_packet_header(buf, handle);
+       if (!header)
+               return -1;
        *timestamp_begin = header->ctx.timestamp_begin;
        return 0;
 }
@@ -410,6 +434,8 @@ static int client_timestamp_end(struct lttng_ust_lib_ring_buffer *buf,
        struct packet_header *header;
 
        header = client_packet_header(buf, handle);
+       if (!header)
+               return -1;
        *timestamp_end = header->ctx.timestamp_end;
        return 0;
 }
@@ -421,6 +447,8 @@ static int client_events_discarded(struct lttng_ust_lib_ring_buffer *buf,
        struct packet_header *header;
 
        header = client_packet_header(buf, handle);
+       if (!header)
+               return -1;
        *events_discarded = header->ctx.events_discarded;
        return 0;
 }
@@ -432,6 +460,8 @@ static int client_content_size(struct lttng_ust_lib_ring_buffer *buf,
        struct packet_header *header;
 
        header = client_packet_header(buf, handle);
+       if (!header)
+               return -1;
        *content_size = header->ctx.content_size;
        return 0;
 }
@@ -443,6 +473,8 @@ static int client_packet_size(struct lttng_ust_lib_ring_buffer *buf,
        struct packet_header *header;
 
        header = client_packet_header(buf, handle);
+       if (!header)
+               return -1;
        *packet_size = header->ctx.packet_size;
        return 0;
 }
@@ -454,6 +486,8 @@ static int client_stream_id(struct lttng_ust_lib_ring_buffer *buf,
        struct packet_header *header;
 
        header = client_packet_header(buf, handle);
+       if (!header)
+               return -1;
        *stream_id = header->stream_id;
        return 0;
 }
@@ -480,6 +514,8 @@ struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = {
                .buffer_end = client_buffer_end,
                .buffer_create = client_buffer_create,
                .buffer_finalize = client_buffer_finalize,
+               .content_size_field = client_content_size_field,
+               .packet_size_field = client_packet_size_field,
        },
        .timestamp_begin = client_timestamp_begin,
        .timestamp_end = client_timestamp_end,
@@ -498,6 +534,8 @@ static const struct lttng_ust_lib_ring_buffer_config client_config = {
        .cb.buffer_end = client_buffer_end,
        .cb.buffer_create = client_buffer_create,
        .cb.buffer_finalize = client_buffer_finalize,
+       .cb.content_size_field = client_content_size_field,
+       .cb.packet_size_field = client_packet_size_field,
 
        .tsc_bits = LTTNG_COMPACT_TSC_BITS,
        .alloc = RING_BUFFER_ALLOC_PER_CPU,
@@ -522,7 +560,8 @@ struct lttng_channel *_channel_create(const char *name,
                                unsigned int switch_timer_interval,
                                unsigned int read_timer_interval,
                                unsigned char *uuid,
-                               uint32_t chan_id)
+                               uint32_t chan_id,
+                               const int *stream_fds, int nr_stream_fds)
 {
        struct lttng_channel chan_priv_init;
        struct lttng_ust_shm_handle *handle;
@@ -537,7 +576,8 @@ struct lttng_channel *_channel_create(const char *name,
                        sizeof(struct lttng_channel),
                        &chan_priv_init,
                        buf_addr, subbuf_size, num_subbuf,
-                       switch_timer_interval, read_timer_interval);
+                       switch_timer_interval, read_timer_interval,
+                       stream_fds, nr_stream_fds);
        if (!handle)
                return NULL;
        lttng_chan = priv;
@@ -601,6 +641,13 @@ void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *sr
        lib_ring_buffer_write(&client_config, ctx, src, len);
 }
 
+static
+void lttng_event_strcpy(struct lttng_ust_lib_ring_buffer_ctx *ctx, const char *src,
+                    size_t len)
+{
+       lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#');
+}
+
 #if 0
 static
 wait_queue_head_t *lttng_get_reader_wait_queue(struct channel *chan)
@@ -651,6 +698,7 @@ static struct lttng_transport lttng_relay_transport = {
        .ops = {
                .channel_create = _channel_create,
                .channel_destroy = lttng_channel_destroy,
+               .u.has_strcpy = 1,
                .event_reserve = lttng_event_reserve,
                .event_commit = lttng_event_commit,
                .event_write = lttng_event_write,
@@ -660,6 +708,7 @@ static struct lttng_transport lttng_relay_transport = {
                .is_finalized = lttng_is_finalized,
                .is_disabled = lttng_is_disabled,
                .flush_buffer = lttng_flush_buffer,
+               .event_strcpy = lttng_event_strcpy,
        },
        .client_config = &client_config,
 };