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Python needs an actual default function (lemmy.ml)

submitted 3 weeks ago by [email protected] to c/[email protected]

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Also, do y'all call main() in the if block or do you just put the code you want to run in the if block?

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[–] [email protected] 3 points 3 weeks ago* (last edited 3 weeks ago) (8 children)

Can someone explain to me how to compile a C library with "main" and a program with main? How does executing a program actually work? It has an executable flag, but what actually happens in the OS when it encounters a file with an executable file? How does it know to execute "main"? Is it possible to have a library that can be called and also executed like a program?

Anti Commercial-AI license

[–] [email protected] 1 points 3 weeks ago

There are a lot of other helpful replies in this thread, so I won't add much, but I did find this reference, which you could read if you have a lot of free time. But I particularly liked reading this summary:

_start calls the libc __libc_start_main;

__libc_start_main calls the executable __libc_csu_init (statically-linked part of the libc);

__libc_csu_init calls the executable constructors (and other initialisatios);

__libc_start_main calls the executable main();

__libc_start_main calls the executable exit().

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