Retire LDP man-pages repository

[linuxjm/LDP_man-pages.git] / original / man2 / idle.2

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-.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
-.\" Portions extracted from linux/mm/swap.c:
-.\"                Copyright (C) 1991, 1992  Linus Torvalds
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" Modified 21 Aug 1994 by Michael Chastain <mec@shell.portal.com>:
-.\"   Added text about calling restriction (new in kernel 1.1.20 I believe).
-.\"   N.B. calling "idle" from user process used to hang process!
-.\" Modified Thu Oct 31 14:41:15 1996 by Eric S. Raymond <esr@thyrsus.com>
-.\" "
-.TH IDLE 2 2012-12-31 "Linux" "Linux Programmer's Manual"
-.SH NAME
-idle \- make process 0 idle
-.SH SYNOPSIS
-.B #include <unistd.h>
-.sp
-.B int idle(void);
-.SH DESCRIPTION
-.BR idle ()
-is an internal system call used during bootstrap.
-It marks the process's pages as swappable, lowers its priority,
-and enters the main scheduling loop.
-.BR idle ()
-never returns.
-.PP
-Only process 0 may call
-.BR idle ().
-Any user process, even a process with superuser permission,
-will receive
-.BR EPERM .
-.SH RETURN VALUE
-.BR idle ()
-never returns for process 0, and always returns \-1 for a user process.
-.SH ERRORS
-.TP
-.B EPERM
-Always, for a user process.
-.SH VERSIONS
-Since Linux 2.3.13, this system call does not exist anymore.
-.SH CONFORMING TO
-This function is Linux-specific, and should not be used in programs
-intended to be portable.
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.