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Old 21st December 2019
attilio attilio is offline
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Default documentation about interaction devices-software

Hi.
I would like to understand the general way the dialog between a device and a software happens.
For example, if I write a c program that writes a byte B to a printer, which is the complete travel of B?
I roughly imagine that the program calls a syscall and passes it B, then the syscall does something else.
Does it use a driver and write B in RAM? Where?
Must the device know where B is written?
If yes, who informed it and how?
How does the device read it?
Can the device answer to kernel?
How and where?
And so on,,,
Similar questions for other actions: lighting a pixel, receive
mouse motion information, receive keyboard key pressed information etc etc
Can you suggest me a good lecture about these questions?
I don't have experience about this level of a computer working, but I'm curious.
Thank you in advance.
Have a good day! (In italian: buona giornata!)
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Old 21st December 2019
bsd-keith bsd-keith is offline
Real Name: Keith
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You are basically talking about programming, various languages can be used.

Low level, such as Assembler, complicated, C/C++ is often used at system level, & then there are the high level scripting type languages, such as Perl & Python.

Suggest you do a search online about computer programming, to get a better idea.
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Old 21st December 2019
attilio attilio is offline
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Thank you bsd-keith.
I don't want to act directly at low level (by now) by programming. I would like only to understand, for example, what happen in OpenBSD, step by step, when I write "a" and I see it on my monitor, like now while I'm writing.
Where does the signal starting from the keyboard go? At which address in memory is it written? Does the kernel read the information and write it to a special memory of the video card? And so on.
Is there an openbsd documentation concerning about these topics?
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Old 21st December 2019
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ibara ibara is offline
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ktrace(1)/kdump(1)
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Old 21st December 2019
attilio attilio is offline
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Thanks ibara
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