Troubleshooting 37

SCO OpenServer

UNIX Spooler Problems

The System V lp spooler has a known problem that causes serial ports

with buffers beyond the UNIX internal c-lists to drop characters at the

end of print jobs.

When the lp spooler daemon wants to print something, it forks a child

process. The child opens the printer port, then forks a process to run

the interface shell script. When the shell is finished printing, it exits.

There can still be characters in the output buffer at this point, but

because the child still has the printer port open, the shell exits

immediately. The child is notified that the shell has exited, it sends a

message to the daemon (via the named FIFO) indicating the print job

has completed, the child then exits, and the exit code eventually enters

the port’s close routine.

If there are still characters left to be output to the printer, the process

sleeps in the close routine until the characters have gone out the port

or until the process gets a signal.

The lp spooler, however, upon receipt of the “print done” message,

sends a sigterm signal to the child. If the child is in the close routine

waiting for characters, it wakes up, flushes its buffers, and exits. This

is how the data is lost.

Possible Solutions

1. Enter stty -hupcl <&1 ; in the interface shell script immediately

before every possible exit. This prevents the shell from exiting

before all the characters have been sent out the serial port.

2. Enter sleep 30 in the interface shell script immediately before

every possible exit. This also prevents the shell from exiting before

all the characters have been sent out the serial port.

3. For applications which must access the printer device directly,

insert the following command in the /etc/rc.d/8/userdef file:

stty baud any_flow_control ; while: ; do sleep 3600; done)< portname &

Where baud is the printer baud rate, any_flow_control is any flow

control parameter such as ixon or ixoff, and portname is the serial

device name.

This line can also be issued as a command from the root prompt,

but unless nohup is used, the process exits and the serial line is

reset when root logs out. To ensure that the process is spawned

upon going into multi-user mode and continues until the system is

shut down or the process is killed manually, place this command in

/etc/rc.d/8/userdef.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42

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User’s Guide

Contents

1 Setting Up Your System

Putting Your

Computer Together

Getting Comfortable

Your System is Working

2 Starting Out with HP

My Software Folder

Personal Guide

Easy Internet Access

HP Pavilion PC User’s Guide

HP Support Center

HP Support Center Options

3 Operating Your Computer

Learning Computer Basics

Turning Off Your

Computer

Suspending Your

Using the One-Touch

Multimedia Keyboard

Making a Phone Call

Receiving a Phone Call

Letting the Answering Machine

Take Calls

Playing Messages

Using the Fax Machine

Sending a Fax

4 Running Programs and

Creating Files

Running Software

Programs

Using Documents and

Finding Documents and Folders

Moving Documents and Folders

Adding New Software

Programs to Your

Removing Programs

Removing Icons from the

Windows 95 Desktop

Running MS-DOS

5 Troubleshooting

Answering machine

Fax and phone

Keyboard

Chapter 5 • Troubleshooting

Speakerphone

Windows 95

General problem

Solving Software Issues

Using System Tools

Using SystemWizard

Calling HP Support

Using the HP Pavilion

Recovery CD(s)

6 Upgrading and Servicing

Your Computer

Warnings:

Connecting Components

Using Headphones

Using Your Computer

Replacing the Battery

Replacing the battery

Parallel Port

VGA Serial

Reconfiguring Keyboard

Buttons and the Display

Adding More Memory

Removing a DIMM

Installing Add-in Cards

What Is Plug and Play?

Using the BIOS Setup

BIOS Settings

FCC Regulatory and

Safety Information

Statement of Fax Branding

Declaration of

Conformity

Products Provided with

External Television

Antenna Connectors

Lightning Protection

Power Lines

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