On Sunday 08 August 2021 22:56:55 Michael Kerrisk (man-pages) wrote:

Hello Pali and Alex,

On 8/8/21 10:41 AM, Alejandro Colomar wrote:

quoted

From: Pali Rohár <pali@kernel.org>

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Alejandro Colomar <redacted>
---
 man2/ioctl_tty.2 | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/man2/ioctl_tty.2 b/man2/ioctl_tty.2
index 46294e63f..967b5c4c7 100644
--- a/man2/ioctl_tty.2
+++ b/man2/ioctl_tty.2

@@ -77,6 +77,35 @@ The following four ioctls are just like
 .BR TCSETSW ,
 .BR TCSETSF ,
 except that they take a
+.I "struct termios2\ *"
+instead of a
+.IR "struct termios\ *" .
+If struct member
+.B c_cflag
+contains
+.B BOTHER
+then baudrate is stored in struct members
+.B c_ispeed
+and
+.B c_ospeed
+as integer values.
+These ioctls are not supported on all architectures.
+.RS
+.TS
+lb l.
+TCGETS2	\fBstruct termios2 *\fPargp
+TCSETS2	\fBconst struct termios2 *\fPargp
+TCSETSW2	\fBconst struct termios2 *\fPargp
+TCSETSF2	\fBconst struct termios2 *\fPargp
+.TE
+.RE
+.PP
+The following four ioctls are just like
+.BR TCGETS ,
+.BR TCSETS ,
+.BR TCSETSW ,
+.BR TCSETSF ,
+except that they take a
 .I "struct termio\ *"
 instead of a
 .IR "struct termios\ *" .

The Linux man-pages generally try to maintain historical and 
version info (at least back as far as 2.6.0), so I applied
the patch below.

Hello Michael! That is a good idea. Anyway, these ioctls were not added
for all architectures as for some they are not needed (when version 1
already contains everything what was introduced in version 2).

I collected all details which I found and I know in this email
https://lore.kernel.org/linux-man/20210808210530.ykqrihpfmdabbdl2@pali/ (local)
and it is something which should be properly documented. But I do not
how to put these details into structured manpage...