idle(2) -- Linux man page

 

NAME

idle - make process 0 idle  

SYNOPSIS

#include <unistd.h>

int idle(void);  

DESCRIPTION

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. idle never returns.

Only process 0 may call idle. Any user process, even a process with super-user permission, will receive EPERM.  

RETURN VALUE

idle never returns for process 0, and always returns -1 for a user process.  

ERRORS

EPERM
Always, for a user process.
 

CONFORMING TO

This function is Linux-specific, and should not be used in programs intended to be portable.  

NOTES

Since 2.3.13 this system call does not exist anymore.