Name
idle - make process 0 idleSynopsis
#include <unistd.h> [[deprecated]] 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.