idle - make process 0 idle
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.
idle never returns for process 0, and always returns -1 for a user
EPERM Always, for a user process.
This function is Linux-specific, and should not be used in programs
intended to be portable.
Since 2.3.13 this system call does not exist anymore.
Linux 1.1.46 1994-08-21 IDLE(2)
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