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Userland
This dongle is a A userland is the system utilities that are not a part of the kernel, but provide a base system. The term userland (or user space) refers to all code that runs outside the operating system's kernel. Userland usually refers to the various programs and libraries that the operating system uses to interact with the kernel: software that performs input/output, manipulates file system objects, application software etc.
| User mode | User applications | For example, bash, LibreOffice, OpenOffice, Blender, 0 A.D., Mozilla Firefox, etc. | ||||
|---|---|---|---|---|---|---|
| Low-level system components: | System daemons: systemd, runit, logind, networkd, soundd, ... |
Windowing system: X11, Wayland, Mir, SurfaceFlinger (Android) |
Other libraries: GTK+, Qt, EFL, SDL, SFML, FLTK, GNUstep, etc. |
Graphics: Mesa, AMD Catalyst, ... | ||
| C standard library | open(), exec(), sbrk(), socket(), fopen(), calloc(), ... (up to 2000 subroutines)glibc aims to be POSIX/SUS-compatible, uClibc targets embedded systems, bionic written for Android, etc. | |||||
| Kernel mode | Linux | stat, splice, dup, read, open, ioctl, write, mmap, close, exit, etc. (about 380 system calls)The Linux 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, LVM, device mapper, Linux Network Scheduler, Netfilter Linux Security Modules: SELinux, TOMOYO, AppArmor, Smack | ||||||
| Hardware (CPU, main memory, data storage devices, etc.) | ||||||
