Add user custom timestamp interface

Two new macros are introduced so that users can use their customized
timestamps for DLT messages:
- DLT_LOG_TS(CONTEXT, LOGLEVEL, TS, ARGS ...)
- DLT_LOG_ID_TS(CONTEXT, LOGLEVEL, MSGID, TS, ARGS ...)
Detailed explanations can be found in dlt_for_developers.md.

Also a new option is added to dlt-system to use events' timestamps
from journald adapter.

Signed-off-by: Sebastian Unger <sunger@de.adit-jv.com>

4 files changed, 30 insertions, 7 deletions

diff --git a/src/system/dlt-system-journal.c b/src/system/dlt-system-journal.c
index 5c10c50..2845406 100644
--- a/src/system/dlt-system-journal.c
+++ b/src/system/dlt-system-journal.c
@@ -202,6 +202,7 @@ void journal_thread(void *v_conf)
     sd_journal *j;
     char match[DLT_SYSTEM_JOURNAL_BOOT_ID_MAX_LENGTH] = "_BOOT_ID=";
     sd_id128_t boot_id;
+    uint32_t ts;
 
     char buffer_process[DLT_SYSTEM_JOURNAL_BUFFER_SIZE] = { 0 },
          buffer_priority[DLT_SYSTEM_JOURNAL_BUFFER_SIZE] = { 0 },
@@ -345,13 +346,26 @@ void journal_thread(void *v_conf)
                 snprintf(buffer_priority, DLT_SYSTEM_JOURNAL_BUFFER_SIZE, "prio_unknown:");
 
             /* write log entry */
-            DLT_LOG(journalContext, loglevel,
-                    DLT_STRING(timestamp.real),
-                    DLT_STRING(timestamp.monotonic),
-                    DLT_STRING(buffer_process),
-                    DLT_STRING(buffer_priority),
-                    DLT_STRING(buffer_message)
-                    );
+            if (conf->Journal.UseOriginalTimestamp == 0) {
+                DLT_LOG(journalContext, loglevel,
+                        DLT_STRING(timestamp.real),
+                        DLT_STRING(timestamp.monotonic),
+                        DLT_STRING(buffer_process),
+                        DLT_STRING(buffer_priority),
+                        DLT_STRING(buffer_message)
+                        );
+
+            }
+            else {
+                /* since we are talking about points in time, I'd prefer truncating over arithmetic rounding */
+                ts = (uint32_t)(atof(timestamp.monotonic) * 10000);
+                DLT_LOG_TS(journalContext, loglevel, ts,
+                           DLT_STRING(timestamp.real),
+                           DLT_STRING(buffer_process),
+                           DLT_STRING(buffer_priority),
+                           DLT_STRING(buffer_message)
+                           );
+            }
         }
         else {
             r = sd_journal_wait(j, 1000000);
diff --git a/src/system/dlt-system-options.c b/src/system/dlt-system-options.c
index 667db9c..5fa31cb 100644
--- a/src/system/dlt-system-options.c
+++ b/src/system/dlt-system-options.c
@@ -148,6 +148,7 @@ void init_configuration(DltSystemConfiguration *config)
     config->Journal.CurrentBoot = 1;
     config->Journal.Follow = 0;
     config->Journal.MapLogLevels = 1;
+    config->Journal.UseOriginalTimestamp = 1;
 
     /* File transfer */
     config->Filetransfer.Enable = 0;
@@ -289,6 +290,10 @@ int read_configuration_file(DltSystemConfiguration *config, char *file_name)
             {
                 config->Journal.MapLogLevels = atoi(value);
             }
+            else if (strcmp(token, "JournalUseOriginalTimestamp") == 0)
+            {
+                config->Journal.UseOriginalTimestamp = atoi(value);
+            }
 
             /* File transfer */
             else if (strcmp(token, "FiletransferEnable") == 0)
diff --git a/src/system/dlt-system.conf b/src/system/dlt-system.conf
index b3677f9..4010b70 100644
--- a/src/system/dlt-system.conf
+++ b/src/system/dlt-system.conf
@@ -74,6 +74,9 @@ JournalFollow = 0
 # 7       Debug 		DLT_LOG_DEBUG
 JournalMapLogLevels = 1
 
+# Use the original timestamp (uptime when the event actually occured) as DLT timestamp (Default: 1)
+JournalUseOriginalTimestamp = 1
+
 ########################################################################
 # Filetransfer Manager
 ########################################################################
diff --git a/src/system/dlt-system.h b/src/system/dlt-system.h
index ed2b50b..46738b8 100644
--- a/src/system/dlt-system.h
+++ b/src/system/dlt-system.h
@@ -107,6 +107,7 @@ typedef struct {
     int CurrentBoot;
     int Follow;
     int MapLogLevels;
+    int UseOriginalTimestamp;
 } JournalOptions;
 
 typedef struct {