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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
  [3244] C and C++ - preprocess, compile, load, run - what each step is for - (2011-04-12)
  [3234] Your program - you just provide the filling in the sandwich - (2011-04-08)
  [3148] OpenGL / C / C++ - an example to get you started - (2011-01-26)
  [2575] Sharing variables between files of code in C - extern - (2010-01-14)


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Moving from C to C++ - Structured to Object Oriented - a lesson for engineers
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Catching up on a week all in a single post (?)
Rail Conference, Nottingham
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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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