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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
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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Sorting in Python 3 - and how it differs from Python 2 sorting
Four in a Bed - most popular answers
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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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