Add a log print function type for information reporting

This type allows the use of either printf-based or log-based functions
when reporting information.

1 files changed, 10 insertions, 1 deletions

diff --git a/kern/log.h b/kern/log.h
index 554dbb27..af5e009f 100644
--- a/kern/log.h
+++ b/kern/log.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 Richard Braun.
+ * Copyright (c) 2017-2019 Richard Braun.
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -38,6 +38,15 @@ enum {
 };
 
 /*
+ * Type for function pointers that may be used as either a log function
+ * or printf.
+ *
+ * One call to a log print function produces a single log line, with a
+ * newline character.
+ */
+typedef int (*log_print_fn_t)(const char *format, ...);
+
+/*
  * Generate a message and send it to the log thread.
  *
  * The arguments and return value are similar to printf(), with