Template:Linux layers

Various layers within Linux, also showing separation between the userland and kernel space

User mode	User applications	bash, LibreOffice, GIMP, Blender, 0 A.D., Mozilla Firefox, ...
	System components	init daemon: OpenRC, runit, systemd...	System daemons: polkitd, smbd, sshd, udevd...	Window manager: X11, Wayland, SurfaceFlinger (Android)	Graphics: Mesa, AMD Catalyst, ...	Other libraries: GTK, Qt, EFL, SDL, SFML, FLTK, GNUstep, ...
	C standard library	fopen, execv, malloc, memcpy, localtime, pthread_create... (up to 2000 subroutines) glibc aims to be fast, musl aims to be lightweight, uClibc targets embedded systems, bionic was written for Android, etc. All aim to be POSIX/SUS-compatible.
Kernel mode	Linux kernel	stat, splice, dup, read, open, ioctl, write, mmap, close, exit, etc. (about 380 system calls) The Linux kernel System Call Interface (SCI), aims to be POSIX/SUS-compatible
		Process scheduling subsystem	IPC subsystem	Memory management subsystem	Virtual files subsystem	Network subsystem
		Other components: ALSA, DRI, evdev, klibc, LVM, device mapper, Linux Network Scheduler, Netfilter Linux Security Modules: SELinux, TOMOYO, AppArmor, Smack
Hardware (CPU, main memory, data storage devices, etc.)

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