X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-ring-buffer-metadata-client.h;h=64940163d10250c4ba0e2dcbc60ee8df3f7e774d;hb=e56bb47c3af00db3bc9e2dea711bef4882e6ef4c;hp=921549faff4c8cc95ff5e3afe2c41aa653cc4c1c;hpb=5ea386c3b8e3566ec0b6710c82aae433de4d944a;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-ring-buffer-metadata-client.h b/liblttng-ust/lttng-ring-buffer-metadata-client.h
index 921549fa..64940163 100644
--- a/liblttng-ust/lttng-ring-buffer-metadata-client.h
+++ b/liblttng-ust/lttng-ring-buffer-metadata-client.h
@@ -52,10 +52,11 @@ static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan)
 }
 
 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)
+				 struct lttng_ust_lib_ring_buffer_ctx *ctx,
+				 void *client_ctx)
 {
 	return 0;
 }
@@ -72,7 +73,8 @@ static
 size_t client_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)
+				 struct lttng_ust_lib_ring_buffer_ctx *ctx,
+				 void *client_ctx)
 {
 	return 0;
 }
@@ -101,6 +103,9 @@ 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 = TSDL_MAGIC_NUMBER;
 	memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid));
 	header->checksum = 0;		/* 0 if unused */
@@ -129,6 +134,9 @@ 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->content_size = data_size * CHAR_BIT;		/* in bits */
 	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
 	/*
@@ -234,7 +242,18 @@ void lttng_channel_destroy(struct lttng_channel *chan)
 static
 int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id)
 {
-	return lib_ring_buffer_reserve(&client_config, ctx);
+	int ret;
+
+	ret = lib_ring_buffer_reserve(&client_config, ctx, NULL);
+	if (ret)
+		return ret;
+	if (caa_likely(ctx->ctx_len
+			>= sizeof(struct lttng_ust_lib_ring_buffer_ctx))) {
+		if (lib_ring_buffer_backend_get_pages(&client_config, ctx,
+				&ctx->backend_pages))
+			return -EPERM;
+	}
+	return 0;
 }
 
 static