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Diffstat (limited to 'man2/idle.2')
| -rw-r--r-- | man2/idle.2 | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/man2/idle.2 b/man2/idle.2 new file mode 100644 index 000000000..35d13c26c --- /dev/null +++ b/man2/idle.2 @@ -0,0 +1,63 @@ +.\" Hey Emacs! This file is -*- nroff -*- source. +.\" +.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu) +.\" Portions extracted from linux/mm/swap.c: +.\" Copyright (C) 1991, 1992 Linus Torvalds +.\" +.\" 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 +.\" +.\" Since the Linux kernel and libraries are constantly changing, this +.\" manual page may be incorrect or out-of-date.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. +.\" +.\" 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 1994-08-21 "Linux 1.1.46" "Linux Programmer's Manual" +.SH NAME +idle \- make process 0 idle +.SH SYNOPSIS +.B #include <unistd.h> +.sp +.B int idle(void); +.SH DESCRIPTION +.B 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. +.B idle +never returns. +.PP +Only process 0 may call +.BR idle . +Any user process, even a process with super-user permission, +will receive +.BR EPERM . +.SH "RETURN VALUE" +.B 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 "CONFORMING TO" +This function is Linux-specific, and should not be used in programs +intended to be portable. +.SH NOTES +Since 2.3.13 this system call does not exist anymore. |