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crt0
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<p>crt0 (also known as c0) is a set of execution startup routines <a href="/facts/Linker_(computing)/pn1hztYe">linked</a> into a <a href="/facts/C_(programming_language)/Ky2No763">C</a> program that performs any initialization work required before calling the program's <a href="/facts/Main_function/nN52vHKb">main function</a>. After the main function completes the control returns to crt0, which calls the library function exit(0) to terminate the process. </p>