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Giving up on user input - keyboard timeout in Perl
There's an old piece of code that I've used to demontstrate how (in Perl) you can prompt for a user input ... but then time out the input on an alarm signal if the user doesn't enter data within a certain time. The code's [here]
if you want to have a look. But let me warn you ... it's one of those thisng that may be somewhat operating system dependent, even though most Perl code is pretty darned portable.
A correspondent writes: "try the code; it hangs after the first warning. The comeon signal handler needs to call the alarm and increment the counter because the code in the main loop that looks to do so is never reached when no entry is typed. a correction would look like [this] (good exercise for student, by the way, so thanks)"
Hmmm ... on the laptops that I'm working on today (Mac OS X / Perl 5.8.x) both
versions work perfectly. The second version (from M.K.) illustrates his point, but with a degree of code duplication so it could really do with being tidied up ... and I have not yet tested it across a range of platforms. I'm posting links to both examples, and these notes, because waiting for a user input ... but only for a while, before carrying on ... is a very useful capability, and these notes may be of some help to the reader, even though I have not fully researched the story.
What is does remind me of is that saying:
"Compatible" = "99% Compatible" = "Incompatible"
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesP305 - Perl - User Input 
Keyboard reading in Perl - character by character not line by line - (2009-06-01) 
Different perl examples - some corners I rarely explore - (2010-07-18)
Some other Articles
Computing under the influence of alcoholReading all our recent news from a single sourceLooking ahead to the Autumn season of training and accommodationLua Regular ExpressionsGiving up on user input - keyboard timeout in PerlChecking the database connection manuallyObject Oriented programming - a practical design exampleMaking variables persistant, pretending a database is a variable and other Perl tricksHandling XML in Perl - introduction and early examplesWiltshire / Melksham Weddings - guest accommodation
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