Added experimental ktrace_[v]printf() functions to libroot. Their output

is recorded in a kernel trace entry (if tracing is enabled).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23686 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/kernel/OS.h

@@ -362,6 +362,9 @@ extern int disable_debugger(int state);
 extern void debug_printf(const char *format, ...)
 	__attribute__ ((format (__printf__, 1, 2)));
 extern void debug_vprintf(const char *format, va_list args);
+extern void ktrace_printf(const char *format, ...)
+	__attribute__ ((format (__printf__, 1, 2)));
+extern void ktrace_vprintf(const char *format, va_list args);
 
 
 /*-------------------------------------------------------------*/

headers/private/kernel/syscalls.h

@@ -300,6 +300,7 @@ extern status_t		_kern_get_system_info(system_info *info, size_t size);
 
 /* Debug output */
 extern void			_kern_debug_output(const char *message);
+extern void			_kern_ktrace_output(const char *message);
 extern status_t		_kern_frame_buffer_update(addr_t baseAddress, int32 width,
 						int32 height, int32 depth, int32 bytesPerRow);
 

headers/private/kernel/tracing.h

@@ -87,6 +87,8 @@ char* alloc_tracing_buffer_strcpy(const char* source, size_t maxSize,
 			bool user);
 status_t tracing_init(void);
 
+void _user_ktrace_output(const char *message);
+
 #ifdef __cplusplus
 }
 #endif

src/system/kernel/debug/tracing.cpp

@@ -317,6 +317,32 @@ AbstractTraceEntry::AddDump(TraceOutput& out)
 bool AbstractTraceEntry::sPrintTeamID = false;
 
 
+//	#pragma mark -
+
+
+#if ENABLE_TRACING
+
+class UserTraceEntry : public AbstractTraceEntry {
+	public:
+		UserTraceEntry(const char* message)
+		{
+			fMessage = alloc_tracing_buffer_strcpy(message, 256, true);
+
+			Initialized();
+		}
+
+		virtual void AddDump(TraceOutput& out)
+		{
+			out.Print("user: %s", fMessage);
+		}
+
+	private:
+		char*	fMessage;
+};
+
+#endif	// ENABLE_TRACING
+
+
 //	#pragma mark - trace filters
 
 
@@ -1026,3 +1052,12 @@ tracing_init(void)
 	return B_OK;
 }
 
+
+void
+_user_ktrace_output(const char *message)
+{
+#if	ENABLE_TRACING
+	new(nothrow) UserTraceEntry(message);
+#endif	// ENABLE_TRACING
+}
+

src/system/libroot/os/debug.c

@@ -289,3 +289,23 @@ debug_vprintf(const char *format, va_list args)
 }
 
 
+void
+ktrace_printf(const char *format, ...)
+{
+	va_list list;
+	va_start(list, format);
+
+	ktrace_vprintf(format, list);
+
+	va_end(list);
+}
+
+
+void
+ktrace_vprintf(const char *format, va_list args)
+{
+	char buffer[1024];
+	vsnprintf(buffer, sizeof(buffer), format, args);
+
+	_kern_ktrace_output(buffer);
+}