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--- projects:diskblinker [2026/02/06 22:42] – created azzy
+++ projects:diskblinker [2026/05/11 16:22] (current) – edml
@@ Line 1: / Line 1: @@
+# disk blinker - use caps lock LED as disk activity indicator
+C program, linux.
+Focus on making it work for me first, then figure out how to make it portable and efficient
+Not a big project, something interesting though to start with
+https://github.com/MeanEYE/Disk-Indicator/ works but is a bit complex, incorporates Xorg and command line client.
+	- Based on a much simpler (albeit in C++) program: https://stahlke.org/dan/hdd_led/
+# Unbuffered writes to /sys
+Need to make fp an unbuffered stream with `setvbuf (fp, NULL, _IONBF, 0);`. This flushes writes to the leds as soon as they are written.
+# Without polling
+I only need: daemon that watches when disk activity file is changed (read or written) and sets LED to 1 for a few ms, then off.
+https://www.kernel.org/doc/Documentation/block/stat.txt
+Looks like there's only one file that has all values together.
+Also I'm not sure if files from /sys can be watched with inotify API.

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