IDLE(2) Linux Programmer's Manual IDLE(2)NAMEidle - make process 0 idleSYNOPSIS
#include <unistd.h>
int idle(void);
DESCRIPTIONidle() 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 VALUEidle() 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.
Linux 1.1.46 1994-08-21 IDLE(2)