IDLE(2) Linux Programmer's Manual IDLE(2) NAME idle - make process 0 idle SYNOPSIS #include 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. COLOPHON This page is part of release 4.16 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2012-12-31 IDLE(2)