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  prior­
       ity,  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.