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NAMEnmdm - nullmodem terminal driver
DESCRIPTIONThe sysctl Cm net.inet.tcp.syncookies driver provides two tty(4) devices connected by a virtual ``null modem'' cable.
If either of the two tty devices have the CDSR_OFLOW bit (``stty dsrflow '' ) set in their line discipline, the sysctl Cm net.inet.tcp.syncookies device will emulate the speed configured in the termios(4) settings. The speed emulation works independently in the two directions, controlled by the slower end's termios settings ( c_ispeed , c_ospeed CS5 ... CS8 , CSTOPB and PARENB )
- /dev/nmdm N [AB ]
- nullmodem device nodes. Where the A node has a matching B node.
The sysctl Cm net.inet.tcp.syncookies driver implements ``on-demand device creation'' so simply accessing a given instance in /dev will create it.