explain_getpgid_or_die(3)

💖 explain_getpgid_or_die — library functions manual, bestie edition 💖

okay so this is a page from the Library Functions Manual and it's all about explain_getpgid_or_die(3) — yes the name is a whole mouthful, we love that for it.

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✨ NAME ✨

explain_getpgid_or_die — grab a process group and, like, report the errors if it all goes sideways 🫶

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🌸 SYNOPSIS 🌸

#include <libexplain/getpgid.h>
pid_t explain_getpgid_or_die(pid_t pid);
pid_t explain_getpgid_on_error(pid_t pid);

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🦋 DESCRIPTION 🦋

So the explain_getpgid_or_die function is literally just here to call the getpgid(2) system call. That's the whole job. But the way that it handles failure?? Iconic. If it fails, an explanation gets printed to stderr — and that explanation comes straight from the explain_getpgid(3) function — and then the process terminates by calling exit(EXIT_FAILURE). yeah. it does not come back. periodt 💀

Then we have explain_getpgid_on_error, which also calls the getpgid(2) system call, and on failure it also prints an explanation to stderr (again, courtesy of explain_getpgid(3)) — but this one is chill, it still returns to the caller. no dramatic exit. we respect the difference ✨

• pid — the pid, exactly as to be passed to the getpgid(2) system call. no extra seasoning, no vibes-based reinterpretation, just pass it through 💅

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👑 RETURN VALUE 👑

explain_getpgid_or_die only returns on success — check out getpgid(2) if you wanna know more about that. On failure it prints an explanation and exits, so like… it does not return. at all. bye bestie 😭

explain_getpgid_on_error always returns the value returned by the wrapped getpgid(2) system call. every time. no cap.

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🎀 EXAMPLE 🎀

The explain_getpgid_or_die function is meant to be used in a fashion similar to this lil guy right here:

pid_t result = explain_getpgid_or_die(pid);

that's it. that's the whole flex. ate and left no crumbs 🍓

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🌈 SEE ALSO 🌈

• getpgid(2) — get process group
• explain_getpgid(3) — explain getpgid(2) errors
• exit(2) — terminate the calling process

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💜 COPYRIGHT 💜

libexplain version 1.4 Copyright (C) 2011 Peter Miller

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and that's the whole page bestie!! 🧚 thanks for reading all the way to the bottom, you're genuinely the main character for that. this was explain_getpgid_or_die(3), from libexplain version 1.4, copyright (C) 2011 Peter Miller — mwah, go call some system calls responsibly 💅✨