diff --git a/CMakeLists.txt b/CMakeLists.txt
index efb741df..2570b3c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,7 @@ endif()
 
 add_definitions(-DWLR_GIT_VERSION=\"${GIT_COMMIT_HASH}\")
 add_definitions(-DWLR_GIT_BRANCH=\"${GIT_BRANCH}\")
+add_definitions(-DWLR_SRC_DIR=\"${CMAKE_SOURCE_DIR}\")
 
 string(TIMESTAMP CURRENT_DATE "%Y-%m-%d" UTC)
 add_definitions(-DWLR_VERSION_DATE=\"${CURRENT_DATE}\")
diff --git a/common/log.c b/common/log.c
index 7e59fcca..af07334a 100644
--- a/common/log.c
+++ b/common/log.c
@@ -10,7 +10,7 @@
 #include "common/log.h"
 
 static bool colored = true;
-static log_callback_t log_callback;
+static log_callback_t log_callback = wlr_log_stderr;
 
 static const char *verbosity_colors[] = {
 	[L_SILENT] = "",
@@ -21,46 +21,26 @@ static const char *verbosity_colors[] = {
 
 void wlr_log_init(log_callback_t callback) {
 	log_callback = callback;
-	// TODO: Use log callback
 }
 
-void _wlr_vlog(const char *filename, int line, log_importance_t verbosity,
-		const char *format, va_list args) {
+void wlr_log_stderr(log_importance_t verbosity, const char *fmt, va_list args) {
 	// prefix the time to the log message
-	static struct tm result;
-	static time_t t;
-	static struct tm *tm_info;
+	struct tm result;
+	time_t t = time(NULL);
+	struct tm *tm_info = localtime_r(&t, &result);
 	char buffer[26];
 
-	// get current time
-	t = time(NULL);
-	// convert time to local time (determined by the locale)
-	tm_info = localtime_r(&t, &result);
 	// generate time prefix
-	strftime(buffer, sizeof(buffer), "%x %X - ", tm_info);
+	strftime(buffer, sizeof(buffer), "%F %T - ", tm_info);
 	fprintf(stderr, "%s", buffer);
 
-	unsigned int c = verbosity;
-	if (c > sizeof(verbosity_colors) / sizeof(char *) - 1) {
-		c = sizeof(verbosity_colors) / sizeof(char *) - 1;
-	}
+	unsigned c = (verbosity < L_LAST) ? verbosity : L_LAST - 1;
 
 	if (colored && isatty(STDERR_FILENO)) {
 		fprintf(stderr, "%s", verbosity_colors[c]);
 	}
 
-	if (filename && line) {
-		const char *file = filename + strlen(filename);
-		while (file != filename && *file != '/') {
-			--file;
-		}
-		if (*file == '/') {
-			++file;
-		}
-		fprintf(stderr, "[%s:%d] ", file, line);
-	}
-
-	vfprintf(stderr, format, args);
+	vfprintf(stderr, fmt, args);
 
 	if (colored && isatty(STDERR_FILENO)) {
 		fprintf(stderr, "\x1B[0m");
@@ -68,33 +48,13 @@ void _wlr_vlog(const char *filename, int line, log_importance_t verbosity,
 	fprintf(stderr, "\n");
 }
 
-void _wlr_log(const char *filename, int line, log_importance_t verbosity, const char* format, ...) {
-	va_list args;
-	va_start(args, format);
-	_wlr_vlog(filename, line, verbosity, format, args);
-	va_end(args);
+void _wlr_vlog(log_importance_t verbosity, const char *fmt, va_list args) {
+	log_callback(verbosity, fmt, args);
 }
 
-void wlr_log_errno(log_importance_t verbosity, char* format, ...) {
-	unsigned int c = verbosity;
-	if (c > sizeof(verbosity_colors) / sizeof(char *) - 1) {
-		c = sizeof(verbosity_colors) / sizeof(char *) - 1;
-	}
-
-	if (isatty(STDERR_FILENO)) {
-		fprintf(stderr, "%s", verbosity_colors[c]);
-	}
-
+void _wlr_log(log_importance_t verbosity, const char *fmt, ...) {
 	va_list args;
-	va_start(args, format);
-	vfprintf(stderr, format, args);
+	va_start(args, fmt);
+	log_callback(verbosity, fmt, args);
 	va_end(args);
-
-	fprintf(stderr, ": ");
-	fprintf(stderr, "%s", strerror(errno));
-
-	if (isatty(STDERR_FILENO)) {
-		fprintf(stderr, "\x1B[0m");
-	}
-	fprintf(stderr, "\n");
 }
diff --git a/include/common/log.h b/include/common/log.h
index 849f8ef0..b8654b9b 100644
--- a/include/common/log.h
+++ b/include/common/log.h
@@ -1,18 +1,35 @@
 #ifndef _WLR_INTERNAL_COMMON_LOG_H
 #define _WLR_INTERNAL_COMMON_LOG_H
 #include <stdbool.h>
+#include <string.h>
+#include <errno.h>
 #include <wlr/common/log.h>
 
-void wlr_log_errno(log_importance_t verbosity, char* format, ...) __attribute__((format(printf,2,3)));
+#ifdef __GNUC__
+#define ATTRIB_PRINTF(start, end) __attribute__((format(printf, start, end)))
+#else
+#define ATTRIB_PRINTF(start, end)
+#endif
+
+void _wlr_log(log_importance_t verbosity, const char *format, ...) ATTRIB_PRINTF(2, 3);
+void _wlr_vlog(log_importance_t verbosity, const char *format, va_list args) ATTRIB_PRINTF(2, 0);
 
-void wlr_log_errno(log_importance_t verbosity, char* format, ...) __attribute__((format(printf,2,3)));
+// Returns a filename relative to wlroots source directory
+static inline const char *_relpath(const char *file) {
+	const char *prefix = WLR_SRC_DIR;
+	if (strncmp(file, prefix, strlen(prefix)) == 0) {
+		file += strlen(prefix) + 1;
+	}
+	return file;
+}
 
-void _wlr_log(const char *filename, int line, log_importance_t verbosity, const char* format, ...) __attribute__((format(printf,4,5)));
+#define wlr_log(verb, fmt, ...) \
+	_wlr_log(verb, "[%s:%d] " fmt, _relpath(__FILE__), __LINE__, ##__VA_ARGS__)
 
-#define wlr_log(VERBOSITY, FMT, ...) \
-	_wlr_log(__FILE__, __LINE__, VERBOSITY, FMT, ##__VA_ARGS__)
+#define wlr_vlog(verb, fmt, args) \
+	_wlr_vlog(verb, "[%s:%d] " fmt, _relpath(__FILE__), __LINE__, args)
 
-#define wlr_vlog(VERBOSITY, FMT, VA_ARGS) \
-    _wlr_vlog(__FILE__, __LINE__, VERBOSITY, FMT, VA_ARGS)
+#define wlr_log_errno(verb, fmt, ...) \
+	wlr_log(verb, fmt ": %s", ##__VA_ARGS__, strerror(errno))
 
 #endif
diff --git a/include/wlr/common/log.h b/include/wlr/common/log.h
index 079f989a..c93f9652 100644
--- a/include/wlr/common/log.h
+++ b/include/wlr/common/log.h
@@ -8,10 +8,12 @@ typedef enum {
 	L_ERROR = 1,
 	L_INFO = 2,
 	L_DEBUG = 3,
+	L_LAST,
 } log_importance_t;
 
 typedef void (*log_callback_t)(log_importance_t importance, const char *fmt, va_list args);
 
-void init_log(log_callback_t callback);
+void wlr_init_log(log_callback_t callback);
+void wlr_log_stderr(log_importance_t verbosity, const char *fmt, va_list args);
 
 #endif