explain_wait4_or_die(3)

💖 explain_wait4_or_die — bestie edition 💖

okay so this is a page from the Library Functions Manual (section 3, the library calls girlies), and today we're talking about explain_wait4_or_die. she waits for a process to change state, and if things go wrong? she tells you why and then she leaves. permanently. 💀

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✨ NAME ✨

explain_wait4_or_die — wait for process to change state and report errors 🦋

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🌸 SYNOPSIS 🌸

#include <libexplain/wait4.h>
void explain_wait4_or_die(int pid, int *status, int options, struct
rusage *rusage);

the way that she takes four things and gives you back... nothing. because she doesn't return. main character energy ✨

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💅 DESCRIPTION 💅

so here's the tea: the explain_wait4_or_die function is used to call the wait4(2) system call. On failure, an explanation will be printed to stderr, obtained from explain_wait4(3), and then the process terminates by calling exit(EXIT_FAILURE). 🫶

lowkey that's the whole deal. she calls wait4(2), and if it fails she prints a whole explanation for you (so you're not just sitting there like 👁️👄👁️ wondering what happened) and then she's like "ok bye" and calls exit(EXIT_FAILURE).

This function is intended to be used in a fashion similar to the following example: ⭐

explain_wait4_or_die(pid, status, options, rusage);

okay now let's meet the squad she takes as arguments:

• pid — The pid, exactly as to be passed to the wait4(2) system call. no notes, no edits, just hand it over exactly like that, bestie. 🙈
• status — The status, exactly as to be passed to the wait4(2) system call. same energy. don't get creative. 💜
• options — The options, exactly as to be passed to the wait4(2) system call. yes, literally exactly. 🎀
• rusage — The rusage, exactly as to be passed to the wait4(2) system call. every single one of them is "exactly as to be passed to the wait4(2) system call." she's consistent and I respect it. 👑

💫 Returns: 💫

This function only returns on success, see wait4(2) for more information. On failure, prints an explanation and exits.

⚠️ fr fr: if this function comes back to you, that means everything went fine. if it fails? she prints the explanation and exits the whole process. there is no "check the return value and handle the error" arc here. the error handling is the exit. periodt. 💀

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🦋 SEE ALSO 🦋

• wait4(2) — wait for process to change state ✨
• explain_wait4(3) — explain wait4(2) errors 🌸
• exit(2) — terminate the calling process 💅

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👑 COPYRIGHT 👑

libexplain version 1.4 Copyright (C) 2008 Peter Miller

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and that's the whole page, bestie!! 🎀 go forth, call explain_wait4_or_die, and remember — if she ever returns to you, it's a good day. 💖

🌈 signing off from the Library Functions Manual, explain_wait4_or_die(3), brought to you by libexplain version 1.4, © 2008 Peter Miller 🌈