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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Sockets, time handling and keyboard interrupt handling in C

A new example from last week's C course - a simple TCP/IP server that processes one connection at a time, taking a user's input into a "giftbox" and returning the donantion made by the previous person. The scenario is that you may be given wonderful gifts by people - but sometimes they're not wonderful for you and you would like to swap them!

It's all too easy when writing a new example to include too much into it so that readers are overwhelmed; I've tried in this case to make sockets simple, whilst at the same time providing something that works practically. The code illustrates:
  • a server written in C
  • some time handling in C
  • how we trap ^C (keyboard interrupts) in C via signals
The code could be extended to provide
  • cleaner shutdown
  • forking to handle multiple parallel connections
  • extension to handle longer user input strings / gift descriptions
  • error checking
  • additional logging

Program source is [here] - together with sample outputs from running it - on server, with client and the logfile. This is not something that we cover on every C / C++ course as it's specialist interest - but if you come on one of our public C courses and have an interest, I'll cover it after class f
(written 2015-03-27, updated 2015-03-29)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
C211 - C and C based languages - Standard Libraries and other headers
  [2575] Sharing variables between files of code in C - extern - (2010-01-14)
  [3148] OpenGL / C / C++ - an example to get you started - (2011-01-26)
  [3234] Your program - you just provide the filling in the sandwich - (2011-04-08)
  [3244] C and C++ - preprocess, compile, load, run - what each step is for - (2011-04-12)


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Moving from C to C++ - Structured to Object Oriented - a lesson for engineers
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Sorting in Python 3 - and how it differs from Python 2 sorting
Four in a Bed - most popular answers
Neighbourhood Plan - travel and transport thoughts
Moving from C to C++ - Structured to Object Oriented - a lesson for engineers
Sockets, time handling and keyboard interrupt handling in C
Catching up on a week all in a single post (?)
Rail Conference, Nottingham
Server program written in Tcl using sockets
Reading from a URL, and reading Json, from your Tcl script
Using Object Oriented Tcl and the Tk toolkit together - real life example
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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