sys Directory Reference

Directories
	binfmt

Files
	callout.c
	Callouts: functions to call at a time to come (see sys/callout.h).
	execve.c
	execve(): a process runs another program.
	fork.c
	fork(): a copy of the calling process.
	kthread.c
	Kernel threads.
	lock.c
	The kernel lock.
	proc.c
	Processes: making them and ending them, their IDs, their descriptors, and their sessions and process groups.
	reboot.c
	Restarting, halting and powering off the machine (reboot()), and Ctrl+Alt+Del.
	sched.c
	The scheduler: which thread runs next, and the tick.
	signal.c
	Signals: sending them, and taking them on the way back to user mode.
	sys_file.c
	System calls on files: opening, reading and writing them, their names and attributes, directories, links, mounts and locks.
	sys_net.c
	System calls on sockets: making them, binding, listening, accepting and connecting, sending and receiving, their names and options.
	sys_poll.c
	System calls that wait for any of several descriptors: select() (and pselect()) and poll().
	sys_proc.c
	System calls about processes and threads: exit(), execve(), fork(), waitpid(), threads, IDs, process groups and sessions, memory (sbrk(), mmap(), munmap()), and the machine (uname(), reboot(), sethostname()).
	sys_signal.c
	System calls about signals, timers and the time: kill(), sigaction(), the signal mask, sigsuspend() and sigreturn(), setitimer(), nanosleep(), and the clocks.
	syscall.c
	System calls: what the architecture calls when user mode makes one (syscall_dispatch()), the table of them, and the helpers that several kinds of calls share, for the user memory and descriptors they take.
	syscalls.h
	thread.c
	Threads: making one in a process, and ending one.
	waitq.c
	Wait queues (see sys/waitq.h).