[PATCH v2] termios.3: SPARC architecture has 4 different Bnnn constants

["Pali Rohár" <pali@kernel.org>]

SPARC is special, it does not have Bnnn constants for baud rates above
2000000. Instead it defines 4 Bnnn constants with smaller baud rates.

This difference between SPARC and non-SPARC architectures is present in
both glibc API (termios.h) and also kernel ioctl API (asm/termbits.h).

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 man3/termios.3 | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/man3/termios.3 b/man3/termios.3
index 7b195c95912b..500cf0713e4d 100644
--- a/man3/termios.3
+++ b/man3/termios.3
@@ -953,6 +953,24 @@ to by \fItermios_p\fP to \fIspeed\fP, which must be one of these constants:
 	B1152000
 	B1500000
 	B2000000
+.ft P
+.fi
+.PP
+These constants are additionally supported on the SPARC architecture:
+.PP
+.nf
+.ft B
+	B76800
+	B153600
+	B307200
+	B614400
+.ft P
+.fi
+.PP
+These constants are additionally supported on non-SPARC architectures:
+.PP
+.nf
+.ft B
 	B2500000
 	B3000000
 	B3500000
@@ -960,6 +978,11 @@ to by \fItermios_p\fP to \fIspeed\fP, which must be one of these constants:
 .ft P
 .fi
 .PP
+Due to differences between architectures, portable applications should check
+if a particular
+.BI B nnn
+constant is defined prior to using it.
+.PP
 The zero baud rate, \fBB0\fP,
 is used to terminate the connection.
 If B0 is specified, the modem control lines shall no longer be asserted.
-- 
2.20.1