Reorder struct fields as per upstream spec discussion

See also open-telemetry/opentelemetry-specification#4719 (comment)

Author: ivoanjo

process-context/c-and-cpp/otel_process_ctx.c

@@ -76,8 +76,8 @@ static const otel_process_ctx_data empty_data = {
 typedef struct __attribute__((packed, aligned(8))) {
   char otel_process_ctx_signature[8];        // Always "OTEL_CTX"
   uint32_t otel_process_ctx_version;         // Always > 0, incremented when the data structure changes, currently v2
-  uint64_t otel_process_ctx_published_at_ns; // Always > 0, timestamp from when the context was published in nanoseconds since epoch
   uint32_t otel_process_payload_size;        // Always > 0, size of storage
+  uint64_t otel_process_ctx_published_at_ns; // Always > 0, timestamp from when the context was published in nanoseconds since epoch
   char *otel_process_payload;                // Always non-null, points to the storage for the data; expected to be a protobuf map of string key/value pairs, null-terminated
 } otel_process_ctx_mapping;
 
@@ -171,8 +171,8 @@ otel_process_ctx_result otel_process_ctx_publish(const otel_process_ctx_data *da
   *published_state.mapping = (otel_process_ctx_mapping) {
     .otel_process_ctx_signature = {0}, // Set in "Step: Populate the signature into the mapping" below
     .otel_process_ctx_version = 2,
-    .otel_process_ctx_published_at_ns = published_at_ns,
     .otel_process_payload_size = payload_size,
+    .otel_process_ctx_published_at_ns = published_at_ns,
     .otel_process_payload = published_state.payload
   };
 

process-context/c-and-cpp/otel_process_ctx_dump.sh

@@ -82,11 +82,11 @@ signature="$(
 version="$(
   printf '%s' "$data_b64" | base64 -d | dd bs=1 skip=8 count=4 status=none | od -An -t u4 | tr -d ' '
 )"
-published_at_ns="$(
-  printf '%s' "$data_b64" | base64 -d | dd bs=1 skip=12 count=8 status=none | od -An -t u8 | tr -d ' '
-)"
 payload_size="$(
-  printf '%s' "$data_b64" | base64 -d | dd bs=1 skip=20 count=4 status=none | od -An -t u4 | tr -d ' '
+  printf '%s' "$data_b64" | base64 -d | dd bs=1 skip=12 count=4 status=none | od -An -t u4 | tr -d ' '
+)"
+published_at_ns="$(
+  printf '%s' "$data_b64" | base64 -d | dd bs=1 skip=16 count=8 status=none | od -An -t u8 | tr -d ' '
 )"
 payload_ptr_hex="$(
   printf '%s' "$data_b64" | base64 -d | dd bs=1 skip=24 count=8 status=none | od -An -t x8 | tr -d ' '
@@ -98,8 +98,8 @@ echo "  otel_process_ctx_version         : $version"
 # Convert nanoseconds to seconds for date command
 published_at_s=$((published_at_ns / 1000000000))
 published_at_pretty="$(date -d "@$published_at_s" '+%Y-%m-%d %H:%M:%S %Z')"
-echo "  otel_process_ctx_published_at_ns : $published_at_ns ($published_at_pretty)"
 echo "  otel_process_payload_size        : $payload_size"
+echo "  otel_process_ctx_published_at_ns : $published_at_ns ($published_at_pretty)"
 echo "  otel_process_payload             : 0x$payload_ptr_hex"
 
 echo "Payload dump ($payload_size bytes):"