09-14-2001
I have never worked on a SCO box. And I have never neard of "ditty". But I will describe a similiar sounding problem and solutions involving more mainstream versions of unix and the "stty" program.
Tty ports on systems like hp-ux have a default set of characteristics. You can vary them by opening the device file and issueing an ioctl() call. The
program stty does this. But here is the key...when the last process closes the file, the characteristics go back to the defaults.
So a command like:
stty 9600 < /dev/tty01
changes the baud rate for only as long as the stty command is running.
An ugly but common solution is to run a script like:
( stty 9600 ; sleep 1000000 ) < /dev/tty01
at startup.
A more correct solution is to insure that any program or script that needs to use the port shoulders the responsibility as setting it up the way it need to be. Thus the stty statement should be placed in the interface script used by the lp subsystem to actually do the printing.
Maybe your ditty problem is something like that. But the mere existence of a system command called ditty shows a disregard for unix standards...so maybe not.
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STTY(3) BSD Library Functions Manual STTY(3)
NAME
stty, gtty -- set and get terminal state (defunct)
LIBRARY
Compatibility Library (libcompat, -lcompat)
SYNOPSIS
#include <sgtty.h>
stty(int fd, struct sgttyb *buf);
gtty(int fd, struct sgttyb *buf);
DESCRIPTION
These interfaces are obsoleted by ioctl(2). They are available from the compatibility library, libcompat.
The stty() function sets the state of the terminal associated with fd. The gtty() function retrieves the state of the terminal associated
with fd. To set the state of a terminal the call must have write permission.
The stty() call is actually 'ioctl(fd, TIOCSETP, buf)', while the gtty() call is 'ioctl(fd, TIOCGETP, buf)'. See ioctl(2) and tty(4) for an
explanation.
DIAGNOSTICS
If the call is successful 0 is returned, otherwise -1 is returned and the global variable errno contains the reason for the failure.
SEE ALSO
ioctl(2), tty(4)
HISTORY
The stty() and gtty() functions appeared in 4.2BSD.
BSD
June 4, 1993 BSD