journal: new logging macros to include UNIT=

Adding UNIT= to log lines allows them to be shown
in 'systemctl status' output, etc.

A new set of macros and functions is added. This allows for less
verbose notation than using log_struct() explicitly.

The set of logging functions is expanded to take a pair of arguments
(e.g. "UNIT=" and the RHS) which add an extra line to the structured
log entry. This can be used to add macros which add a different
identifier later on.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/shared/log.h b/src/shared/log.h
index 5c946faf51..9aafcb4100 100644
--- a/src/shared/log.h
+++ b/src/shared/log.h
@@ -85,6 +85,25 @@ int log_metav(
                 const char *format,
                 va_list ap);
 
+int log_meta_object(
+                int level,
+                const char*file,
+                int line,
+                const char *func,
+                const char *object_name,
+                const char *object,
+                const char *format, ...) _printf_attr_(7,8);
+
+int log_metav_object(
+                int level,
+                const char*file,
+                int line,
+                const char *func,
+                const char *object_name,
+                const char *object,
+                const char *format,
+                va_list ap);
+
 int log_struct_internal(
                 int level,
                 const char *file,