ttyhog on pts

[Don Ramm]

I'm getting some ttyhog errors is the error log. They are occurring
on a pts port which is being used by a PC running some TCP/IP software.

I found all sorts of info on how to deal with this in InfoExplorer
and IBM's on-line Q&A database if the ttyhog is happening on a tty
port, but don't know what to do in this case.

Anyone see this error on a pts before? Suggestions?

Is it really as simple as the documentation says:

The tty error is logged because the buffer where
incomeing charactyers are placed is overflowing.

However, this write up from InfoExplorer goes on to say:

When the buffer is about 3/4 fill, the device driver
notifies the hardware (in this case tty) to send the
XOFF character to the sender to sopt sending data.

But it's not the tty in this case.

[Michael Wojcik]

In article <DDHuC...@crash.cts.com> don...@cts.com (Don Ramm) writes:
>I'm getting some ttyhog errors is the error log. They are occurring
>on a pts port which is being used by a PC running some TCP/IP software.
>
>I found all sorts of info on how to deal with this in InfoExplorer
>and IBM's on-line Q&A database if the ttyhog is happening on a tty
>port, but don't know what to do in this case.

A pts is a tty for many purposes, including this one.

>Anyone see this error on a pts before? Suggestions?

You can get ttyhog errors pasting lots of text into aixterms,
which use ptys (psuedo terminals). Many moons ago someone posted
a program which sets the ttyhog size on the pts the program is
run under (ie. the shell's tty). It went something like this
(apologies to the original author):

/*
* Set the OHOG on the current terminal to 4096 bytes. This allows xterm/
* aixterm to do full-window pastes correctly.
*/

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>

void main(void)
{
int fd, bufsz;

if ((fd = open("/dev/tty", O_RDWR, 0666)) < 0)
{
perror("open");
exit(1);
}
bufsz = 4096;
if (ioctl(fd, TXSETOHOG, &bufsz) < 0)
{
perror("ioctl");
exit(1);
}
exit(0);
}

Note that opening "/dev/tty" opens the process' controlling
terminal. If the ptys that are giving you trouble are being used
for login, you can run this program from a .profile or other login
script.

Michael Wojcik
AAI Development, Micro Focus Inc.
Department of English, Miami University