#include <unistd.h> int idle(void);
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 permission, will receive EPERM.
idle() never returns for process 0, and always returns -1 for a user process.
Always, for a user process.
Since Linux 2.3.13, this system call does not exist anymore.
This function is Linux-specific, and should not be used in programs intended to be portable.
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