[PATCH 18/23] termios.3: SPARC architecture has 4 different Bnnn constants

Alejandro Colomar
2021-08-08T08:42:04Z

From: 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>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
---
man3/termios.3 | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/man3/termios.3 b/man3/termios.3
index 4fbd34a52..8c88c25e4 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,
.BR B0 ,
is used to terminate the connection.
--
2.32.0