Bits and Pieces for Developing with Fishnet

Instructional Linux Servers for Development

• blackbox02
• blackbox03
• blackbox04
• blackbox05

Basic Unix Information

• man displays manual pages that describe the functionality and usage of Unix programs and C functions. Type man man to find out how to use man.
• info displays Information pages about Unix programs and C functions. Type info info to learn how to use this tool.

Manipulating the Fishnet Distribution

Compiling Your Code

• To compile for the Linux instructional machines, just type make hw1.
  
• The provided makefile enables you to compile the same source tree for the iPaq. To do this:
  • Set the environment path in one of your xterms to:
    export PATH=/usr/local/arm/2.95.3/bin:/usr/local/arm/2.95.3/arm-linux/bin:$PATH
    
  • Type make ARM=1 hw1.
• To determine if an executable was compiled for Linux (x86) or the iPaq, run file (executable).

Working with the iPaqs

• It may be necessary to recalibrate your iPaq X configuration. Run:
  xcalibrate -cal -94 337 -70 255 0.
• To learn the name of the iPaq, type hostname. This should return mobile###.
• The iPaq networking runs in two different modes: adhoc and managed. Adhoc mode causes iPaqs to talk directly to each other, without the use of a base station; managed mode causes iPaqs to talk through the base station and allows them to access the Internet.
  • To switch to adhoc mode, type cardctl scheme adhoc.
  • To switch to managed mode, type cardctl scheme managed.
• To get files to the iPaq, set the iPaq into managed mode and scp the file to it. From a Linux machine, run scp (file) root@mobile###.dyn.cs.washington.edu and enter the root password when prompted.

To Talk to the iPaq using the Serial Connection

• In Windows, use hyperterminal.
• In Linux, use minicom.
• Set the configuration parameters to a speed of 1152000, parity 8N1, and no hardware flow control.
• In minicom, be sure to change the 'Modem and dialing parameters' to be empty; minicom should not send any string sequences to the iPaq.

Producing Sounds on iPAQ

• Use the system() function in <stdlib.h> to cat a dsp file to /dev/dsp. (Use the man pages for more info.)
• For example, system("cat endoftheworld > /dev/dsp") plays endoftheworld.

Getting Core Files when Segfaults Occur

• You should get core files when segfaults occur on the linux instructional servers. However, if you don't, try the following commands:
  • limit coredumpsize 4194303 # for csh/tcsh
  • ulimit -c 4194303 # for bash/sh

Debugging your program

• You may also wish to use gdb to debug your program. To run it, type "gdb <executable-name>".
• Type "man gdb" in a shell to get more info e.g. how to use gdb with your core files.

Additional information