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.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH idle 2 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
idle \- make process 0 idle
.SH SYNOPSIS
.nf
.B #include <unistd.h>
.P
.B [[deprecated]] int idle(void);
.fi
.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.
.P
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 STANDARDS
Linux.
.SH HISTORY
Removed in Linux 2.3.13.
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