[PATCH v2 2/4] man/man3/termios.3: note that setserial(8) rate hacking is dangerous

The use of setserial(8) to modify the 38400 baud rate was an early
hack to support baud rates beyond those standardized by POSIX. As it
is, it is a real trap for applications that actually want to use 38400
bps if a previous user has not cleaned up the setting.

Signed-off-by: H. Peter Anvin <[email protected]>
---
 man/man3/termios.3 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/man/man3/termios.3 b/man/man3/termios.3
index cd3f9ce4d7c0..f563923fc7cf 100644
--- a/man/man3/termios.3
+++ b/man/man3/termios.3
@@ -1119,7 +1119,9 @@ constant is defined prior to using it.
 The actual bit rate corresponding to
 .B B38400
 may be altered with
-.BR setserial (8).
+.BR setserial (8);
+doing so is discouraged as it may break other applications
+later trying to use the same serial port.
 .P
 The input and output baud rates are stored in the
 .I termios
-- 
2.54.0