Only output text when in debug mode (fixes problems with xautolock)

1 files changed, 13 insertions, 0 deletions

diff --git a/i3lock.h b/i3lock.h
new file mode 100644
index 0000000..3e336ad
--- /dev/null
+++ b/i3lock.h
@@ -0,0 +1,13 @@
+#ifndef _I3LOCK_H
+#define _I3LOCK_H
+
+/* This macro will only print debug output when started with --debug.
+ * This is important because xautolock (for example) closes stdout/stderr by
+ * default, so just printing something to stdout will lead to the data ending
+ * up on the X11 socket (!). */
+#define DEBUG(fmt, ...) do { \
+    if (debug_mode) \
+        printf("[i3lock-debug] " fmt, ##__VA_ARGS__); \
+} while (0)
+
+#endif