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termios.3: Note an XTABS alpha issue 

* man3/termios.3 (.B TABDLY): Reference to the BUGS section.
(.SH BUGS): New section.  Describe an issue on alpha where the XTABS
macro was defined to a value outside TABDLY mask.

Signed-off-by: Eugene Syromyatnikov <evgsyr@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Eugene Syromyatnikov 2018-04-22 19:14:54 +02:00 committed by Michael Kerrisk
parent c0b34c18d6
commit 499eb81f26
1 changed files with 17 additions and 1 deletions
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18
man3/termios.3
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@ -241,7 +241,10 @@ or
.TP
.B TABDLY
Horizontal tab delay mask.
Values are \fBTAB0\fP, \fBTAB1\fP, \fBTAB2\fP, \fBTAB3\fP (or \fBXTABS\fP).
Values are \fBTAB0\fP, \fBTAB1\fP, \fBTAB2\fP, \fBTAB3\fP (or \fBXTABS\fP,
but see the
.B BUGS
section).
A value of TAB3, that is, XTABS, expands tabs to spaces
(with tab stops every eight columns).
[requires
@ -1085,6 +1088,19 @@ behaves like
.\" libc4.7.6, libc5, glibc for unix: duration in ms.
.\" glibc for bsd: duration in us
.\" glibc for sunos4: ignore duration
.SH BUGS
.\" kernel 77e5bff1640432f28794a00800955e646dcd7455
.\" glibc 573963e32ffac46d9891970ddebde2ac3212c5c0
On alpha, Linux before 4.16 (and glibc before 2.28) had
.B XTABS
value different from
.B TAB3
and it was ignored by the
.B N_TTY
line discipline code of the tty driver as a result
(as it wasn't a part of the
.B TABDLY
mask).
.SH SEE ALSO
.BR reset (1),
.BR setterm (1),