How to stop termios.h from adding \xOD

[sharvey99]

I have a script which uses termios.h to access the serial port of a SUN Sparc (/dev/term/b). The script uses the following code snippet to send via the tty.

$msg = "C2 RICE OK?\cJ";
$written = syswrite (PORT,$msg,12,0);

(PORT being the term filehandle)

Using a scope I have found that which ever incantation of \xOA or ^J I use, I always seem to send \0D\0A or crlf.
It appears that the code running the serial connection always prepends lf with cr. Anyone got any ideas how to stop this.

 

[justice41]

You could try binmode'ing the PORT filehandle to raw format.

binmode PORT, ':raw';
# or just
binmode PORT;
# since :raw is the default

This shouldn't make any difference on a Sparc but it's something to try.
If that doesn't work (which it probabaly won't) then the termios structure has several fields which you can set to control how linefeeds are handled. Just google 'termios.h'.

jaa

 

[sharvey99]

Thanks ! I will give it a try.