SYNOPSIS
#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.
STANDARDS
Linux.
HISTORY
Removed in Linux 2.3.13.