idle(2) System Calls Manual idle(2)
idle - make process 0 idle
#include <unistd.h> [[deprecated]] 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.
EPERM Always, for a user process.
Removed in Linux 2.3.13. Linux man-pages 6.04 2023-03-30 idle(2)
Pages that refer to this page: syscalls(2)