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Linux 2.6 - man page for idle (linux section 2)

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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 superuser permis-
       sion, 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.

VERSIONS
       Since Linux 2.3.13, this system call does not exist anymore.

CONFORMING TO
       This function is Linux-specific, and should not be used in programs intended to be  porta-
       ble.

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2012-12-31					  IDLE(2)
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