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pty(4)

The 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 driver.  A
device  node  for  this  terminal shall be created, which has the
name The driver also provides a cloning  System  V  device.   New
code  should  not try to allocate pseudo-terminals using this in‐
terface.  It is only provided for compatibility with older C  li‐
braries  that  tried  to open such devices when was being called.
The BSD-style compatibility pseudo-terminal driver uses the  fol‐
lowing device names: Pseudo-terminal master devices.  Pseudo-ter‐
minal  slave  devices.  Control device, returns a file descriptor
to a new master pseudo-terminal when opened.   None.   A  pseudo-
terminal  driver appeared in Unlike previous implementations, the
master and slave device nodes are destroyed when the PTY  becomes
unused.   A  call  to on a 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.  The driver can‐
not be unloaded, because it cannot determine if it is being used.
















































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