— BSD-style compatibility
driver provides support for the traditional BSD naming
scheme that was used for accessing pseudo-terminals. When the device
is being opened, a new terminal shall be created
with the pts(4)
driver. A device node for this terminal
shall be created, which has the name /dev/ttyXX
New code should not try to allocate pseudo-terminals using this interface. It is
only provided for compatibility with older C libraries that tried to open such
devices when posix_openpt(2)
was being called.
The BSD-style compatibility pseudo-terminal driver uses the following device
- Pseudo-terminal master devices.
- Pseudo-terminal slave devices.
A pseudo-terminal driver appeared in 4.2BSD
Unlike previous implementations, the master slave device nodes are destroyed
when the PTY becomes unused. A call to stat(2)
nonexistent master device will already cause a new master device node to be
created. The master device can only be destroyed by opening and closing it.
driver cannot be unloaded, because it cannot determine
if it is being used.