<fcntl.h>
<ctype.h>
Functions provided by this header:
Trying to Orderly Make an Operating System
Components
<stdio.h>
<stdlib.h>
<string.h>
<sys/ioctl.h>
<sys/reboot.h>
<sys/utsname.h>
<sys/wait.h>
<unistd.h>
General