System call: Difference between revisions

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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.
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).
UNIX has a list of system calls ranging from 0 through 313 (OpenBSD).
In OpenBSD the syscalls 0 through 5 are:
In [[OpenBSD]] the syscalls 0 through 5 are:


syscall(2), exit(2), fork(2), read(2), write(2), open(2)
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.
You can read more about these system calls by reading through section 2 of the UNIX manual.
Also see [[syscall]].

Latest revision as of 09:18, 20 August 2011

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.