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RedHat 9 (Linux i386) - man page for idle (redhat section 2)

IDLE(2) 						     Linux Programmer's Manual							   IDLE(2)

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. Linux 1.1.46 1994-08-21 IDLE(2)