From 9232b8d817d4cd4122947375156fa2fa1e9fba14 Mon Sep 17 00:00:00 2001 From: Jasper Ras Date: Mon, 13 Jan 2025 13:16:06 +0100 Subject: vault backup: 2025-01-13 13:16:06 --- 3 resources/linux/Device drivers.md | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 3 resources/linux/Device drivers.md (limited to '3 resources/linux/Device drivers.md') diff --git a/3 resources/linux/Device drivers.md b/3 resources/linux/Device drivers.md new file mode 100644 index 0000000..95f1a75 --- /dev/null +++ b/3 resources/linux/Device drivers.md @@ -0,0 +1,22 @@ +#linux #devices + +--- +major, minor numbers +major = driver (used by kernel when opening device to dispatch to correct driver) +minor = used by driver to differentiate device(s) + +after disk the major, minor numbers are shown: +``` +[jasras@n04.compute.vps2-lej1 ~]$ ls -l /dev/dm-* +brw-rw---- 1 root disk 253, 0 Oct 25 10:10 /dev/dm-0 +brw-rw---- 1 root disk 253, 1 Oct 25 10:11 /dev/dm-1 +brw-rw---- 1 root root 253, 11 Oct 28 19:58 /dev/dm-11 +brw-rw---- 1 root root 253, 12 Oct 28 19:58 /dev/dm-12 +``` + +available devices: `cat /proc/devices` + +character devices vs block devices; what is the difference? + +--- +[oreilly-device-drivers](https://www.oreilly.com/library/view/linux-device-drivers/0596000081/ch03s02.html) \ No newline at end of file -- cgit v1.2.3