Main Problems of Programming for Multiple OSĮxecuting Other Programs and Reading Their Output

I do it with the hope that this tutorial will be useful, helping you to learn the system programming or perhaps to port an existing app from one OS to another. I've been writing cross-platform software in C for a long time already, and I want to share my experience with the others. We'll discuss the differences between the system API and how to create a cross-platform programming interface that hides all those differences from the user.

I split the difficult stuff into parts so the code samples here shouldn't be overwhelming for those who has just started to program in C. We're going to write our own small helper functions on top of low-level userspace system API and use them so that our main code can run on any OS without modifications. In this tutorial we'll learn how to write cross-platform code in C using the system functions on popular OS (Windows, Linux/Android, macOS & FreeBSD): file management functions and file I/O, console I/O, pipes (unnamed), execution of the new processes.

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