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PTY(4)			 BSD Kernel Interfaces Manual			PTY(4)

NAME
     pty -- BSD-style compatibility pseudo-terminal driver

SYNOPSIS
     device pty

DESCRIPTION
     The pty driver provides support for the traditional BSD naming scheme
     that was used for accessing pseudo-terminals.  When the device /dev/ptyXX
     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 inter-
     face.  It is only provided	for compatibility with older C libraries that
     tried to open such	devices	when posix_openpt(2) was being called.

FILES
     The BSD-style compatibility pseudo-terminal driver	uses the following de-
     vice names:

     /dev/pty[l-sL-S][0-9a-v]  Pseudo-terminal master devices.

     /dev/tty[l-sL-S][0-9a-v]  Pseudo-terminal slave devices.

DIAGNOSTICS
     None.

SEE ALSO
     posix_openpt(2), pts(4), tty(4)

HISTORY
     A pseudo-terminal driver appeared in 4.2BSD.

BUGS
     Unlike previous implementations, the master slave device nodes are	de-
     stroyed when the PTY becomes unused.  A call to stat(2) 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 pty driver cannot be unloaded,	because	it cannot determine if it is
     being used.

BSD				August 20, 2008				   BSD

NAME | SYNOPSIS | DESCRIPTION | FILES | DIAGNOSTICS | SEE ALSO | HISTORY | BUGS

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