System call
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A system call allows communication between a program running in userland and the kernel. In UNIX all I/O is done through a system call except for shared memory which must be set up through a system call though.
UNIX has a list of system calls ranging from 0 through 313 (OpenBSD). In OpenBSD the syscalls 0 through 5 are:
syscall(2), exit(2), fork(2), read(2), write(2), open(2)
You can read more about these system calls by reading through section 2 of the UNIX manual.
Also see syscall.
