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tty0tty is a kernel-module virtual serial port driver for Linux.
The Linux null-modem emulator (tty0tty) is a kernel-module virtual serial port driver for Linux. This create virtual tty ports pairs and use any pair to connect one tty serial port based application to another.
There are a version using pseudo-terminal (UNIX 98 style).
The code contains a virtual com driver which allows applications communicating with serial devices to communicate with another application emulating the serial device. Compared to tty0tty it does not use the tty subsystem of the kernel but implements directly the typical ioctls which are required from upper SW layers