pty - pseudoterminal interfaces
A pseudoterminal (sometimes abbreviated "pty") is a pair of virtual
character devices that provide a bidirectional communication channel.
One end of the channel is called the master; the other end is
called the slave.
The slave end of the pseudoterminal provides an interface that behaves exactly like a classical terminal. A process that expects to be connected to a terminal, can open the slave end of a pseudoterminal and then be driven by a program that has opened the master end. Anything that is written on the master end is provided to the process on the slave end as though it was input typed on a terminal. For example, writing the interrupt character (usually control-C) to the master device would cause an interrupt signal (SIGINT) to be generated for the foreground process group that is connected to the slave. Conversely, anything that is written to the slave end of the pseudoterminal can be read by the process that is connected to the master end.
Data flow between master and slave is handled asynchronously, much like data flow with a physical terminal. Data written to the slave will be available at the master promptly, but may not be available immediately. Similarly, there may be a small processing delay between a write to the master, and the effect being visible at the slave.
Historically, two pseudoterminal APIs have evolved: BSD and System V. SUSv1 standardized a pseudoterminal API based on the System V API, and this API should be employed in all new programs that use pseudoterminals.
Linux provides both BSD-style and (standardized) System V-style pseudoterminals. System V-style terminals are commonly called UNIX 98 pseudoterminals on Linux systems.
Since Linux 2.6.4, BSD-style pseudoterminals are considered deprecated: support can be disabled when building the kernel by disabling the CONFIG_LEGACY_PTYS option. (Starting with Linux 2.6.30, that option is disabled by default in the mainline kernel.) UNIX 98 pseudoterminals should be used in new applications.
An unused UNIX 98 pseudoterminal master is opened by calling
posix_openpt(3). (This function opens the master clone
device, /dev/ptmx; see pts(4).) After
performing any program-specific initializations, changing the ownership
and permissions of the slave device using grantpt(3),
and unlocking the slave using unlockpt(3)), the
corresponding slave device can be opened by passing the name returned by
ptsname(3) in a call to open(2).
The Linux kernel imposes a limit on the number of available UNIX 98
pseudoterminals. Up to and including Linux 2.6.3, this limit is
configured at kernel compilation time
(CONFIG_UNIX98_PTYS), and the permitted number of
pseudoterminals can be up to 2048, with a default setting of 256. Since
Linux 2.6.4, the limit is dynamically adjustable via
/proc/sys/kernel/pty/max, and a corresponding file,
/proc/sys/kernel/pty/nr, indicates how many pseudoterminals are
currently in use. For further details on these two files, see
proc(5).
BSD-style pseudoterminals are provided as precreated pairs, with
names of the form /dev/ptyXY (master) and /dev/ttyXY
(slave), where X is a letter from the 16-character set [p-za-e], and Y
is a letter from the 16-character set [0-9a-f]. (The precise range of
letters in these two sets varies across UNIX implementations.) For
example, /dev/ptyp1 and /dev/ttyp1 constitute a BSD
pseudoterminal pair. A process finds an unused pseudoterminal pair by
trying to open(2) each pseudoterminal master until an
open succeeds. The corresponding pseudoterminal slave (substitute "tty"
for "pty" in the name of the master) can then be opened.
/dev/ptmxUNIX 98 master clone device
/dev/pts/*UNIX 98 slave devices
/dev/pty[p-za-e][0-9a-f]BSD master devices
/dev/tty[p-za-e][0-9a-f]BSD slave devices
Pseudoterminals are used by applications such as network login services ( ssh(1), rlogin(1), telnet(1)), terminal emulators such as xterm(1), script(1), screen(1), tmux(1), unbuffer(1), and expect(1).
A description of the TIOCPKT ioctl(2), which controls packet mode operation, can be found in ioctl_tty(2).
The BSD ioctl(2) operations TIOCSTOP, TIOCSTART, TIOCUCNTL, and TIOCREMOTE have not been implemented under Linux.