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, ...
Windowing system:
X11, Wayland, SurfaceFlinger (Android)
Graphics:
Mesa, AMD Software, ...
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[1]
Process scheduling subsystem IPC subsystem Memory management subsystem Virtual files subsystem Networking 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.)
  1. ^ "Admin Guide README". Kernel.org git repositories.

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