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pty.7: Explicitly mention CONFIG_LEGACY_PTYS 

Explicitly mention CONFIG_LEGACY_PTYS, and note that it is disabled
by default since Linux 2.6.30.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-07-29 09:15:27 +02:00
parent 8931e190a9
commit 9e232754c1
1 changed files with 7 additions and 2 deletions
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@ -66,8 +66,13 @@ 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 kernel 2.6.4, BSD-style pseudoterminals are considered deprecated
(they can be disabled when configuring the kernel);
.PP
Since kernel 2.6.4, BSD-style pseudoterminals are considered deprecated:
support can be disabled when building the kernel by disabling the
.B 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.
.SS UNIX 98 pseudoterminals
An unused UNIX 98 pseudoterminal master is opened by calling