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Re: How was my script launched?

by pc88mxer (Vicar)
on Jul 20, 2008 at 18:48 UTC ( #698927=note: print w/replies, xml ) Need Help??

in reply to How was my script launched?

How about using the -S and -p operators on STDIN?

If your program was invoked by a TCP server (like inetd), then -S STDIN should be true. If it was invoked by a web server then -p STDIN is likely to be true (check this). And if it is taking input from a user then -t STDIN (or perhaps -c STDIN) should be true.

You can also check for environment variables to help decide how you were invoked. For instance, if you are being invoked as a CGI script, the web server will set up a lot of variables that won't be set if you are handling the connection yourself. Same for an interactive session.

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[shmem]: well finally.
[stevieb]: nice! I just finished a GPS "take me home" device last week, and did a bunch of software updates to it yesterday. I also created a pseudo chip with an Arduino to simulate an IC, where it responds to register read/writes over the I2C bus...
[stevieb]: ...from an I2C master. It's ugly and there are many changes I'm going to make, but I had not done anything like it before. It's designed for my RPi:: automated test platform; a system that does CI on *all* my RPi modules.
[shmem]: pseudo chip?
[stevieb]: well, what happens is the Arduino 'listens' for requests r/w, and does the appropriate thing when it's interrupted based on the 'register' address sent in. It's ugly as it was my first attempt, but I've got great new ideas I'm just sitting.

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