Macros starting with 'i' in sys

• _IO sys/ioctl.h:82
• _IOC sys/ioctl.h:80
• IOCBASECMD sys/ioctl.h:70
• IOCGROUP sys/ioctl.h:71
• IOCPARM_LEN sys/ioctl.h:69
• _IOR sys/ioctl.h:83
• _IOW sys/ioctl.h:84
• _IOWR sys/ioctl.h:86
• isbackground sys/tty.h:190
• isclr sys/param.h:171
• isctty sys/tty.h:185
• isset sys/param.h:170