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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. |
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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[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)
Some other Articles
Sorting in Python 3 - and how it differs from Python 2 sortingFour 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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