I thought that I would find a sample program to port as an example for this column, but over a weekend, as I downloaded program after program, I was just more and more impressed with the Linux C library as program after program compiled with simple tweaks like changing the Makefile to use gcc instead of cc and changing paths to executables. I finally found a program that might give some people problems porting, an editor called Freyja.
I copied the supplied makefile.unx to Makefile, and edited the Makefile. I changed CFLAGS to -O2 to use the highest level of optimization from GCC, and typed make at the command line. GCC complained that TIOCGETP, TIOCSETP, and RAW were undefined. This means that Freyja is written with BSD in mind. There did not appear to be any #define's that I could make to change Freyja's behavior to SYSV or POSIX, either.
So, following the steps in the GCC-FAQ, I added -I/usr/include/bsd to the CFLAGS line, and -lbsd to the link line (called FXLINK in Freyja for some strange reason; it's usually called LDFLAGS), and ran make again.
That was all that was required to “port” this bsd-oriented program. I had to read the documentation to find out that I needed to call it with the arguments “-kT -s29” to tell it how to write to the screen and read from the keyboard, or that I needed to compile an equivalent change into the resource file that Freyja uses, but it was very simple.
Freyja is written by Craig A. Finseth, and is available via ftp from mail.unet.umn.edu, or if you don't have ftp access, via U.S. mail. Quoting the README:
Diskette: Send the author blank diskettes:
3 1/2" (1.44 MB), or
3 1/2" (720 KB)
and a SASE or enough stamps to cover return postage plus a dollar or so (so that I can buy a diskette mailer). Or you can just send me about US\$5.00 in check, stamp, whatever and I will furnish the diskette(s) and mailer. Non-US people can send me four 1.44 MB 3 1/2" diskettes in lieu of money. (More money is always nice, but please don't feel obligated in any way.)
The address is: Craig Finseth1343 LafondSt. Paul, MN55104, USA
Here's your chance to contribute! If you have difficulties porting a general Un*x application to Linux, please either send email to firstname.lastname@example.org or send snail mail to Programming Tips, Linux Journal, P.O. Box 85867, Seattle, WA 98145-1867, with a description of how to get the program via the internet, or with a copy of the application enclosed on floppy, 150MB QIC tape, or standard DAT, and with a detailed explanation of what you have tried in your attempt to port it, and I may try it myself, especially if it looks like it will make worthwhile material for this column.
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.View Now!
|The Firebird Project's Firebird Relational Database||Jul 29, 2016|
|Stunnel Security for Oracle||Jul 28, 2016|
|SUSE LLC's SUSE Manager||Jul 21, 2016|
|My +1 Sword of Productivity||Jul 20, 2016|
|Non-Linux FOSS: Caffeine!||Jul 19, 2016|
|Murat Yener and Onur Dundar's Expert Android Studio (Wrox)||Jul 18, 2016|
- The Firebird Project's Firebird Relational Database
- Stunnel Security for Oracle
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- SUSE LLC's SUSE Manager
- Managing Linux Using Puppet
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Parsing an RSS News Feed with a Bash Script
- Google's SwiftShader Released
- Doing for User Space What We Did for Kernel Space
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide