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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 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. 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 portable. Linux 2021-03-22 IDLE(2)