explain_munmap_or_die(3)

💖 explain_munmap_or_die — Library Functions Manual 💖

okay bestie, sit down, hydrate, and let me tell you about explain_munmap_or_die(3) — she lives in your friendly neighbourhood libexplain and she is so good at her job 🫶

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✨ NAME ✨

explain_munmap_or_die — unmap a file or device from memory, and then actually tell you when it went wrong 💅

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🌸 SYNOPSIS 🌸

#include <libexplain/munmap.h>
void explain_munmap_or_die(void *data, size_t data_size);
int explain_munmap_on_error(void *data, size_t data_size);

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🦋 DESCRIPTION 🦋

so here's the tea ☕ — explain_munmap_or_die is the little wrapper that calls the munmap(2) system call for you. and if it fails? she does not leave you hanging. an explanation gets printed to stderr, pulled straight from the explain_munmap(3) function, and then the process terminates by calling exit(EXIT_FAILURE). yeah. she's dramatic like that 💀

meanwhile explain_munmap_on_error is the softer sister 🌷 — she also calls the munmap(2) system call, and on failure she also prints an explanation to stderr obtained from explain_munmap(3), but she still returns to the caller. no exit, no chaos, just vibes. 🙈

data the data, exactly as to be passed to the munmap(2) system call. like, character for character, no notes.

data_size the data_size, exactly as to be passed to the munmap(2) system call. same energy, same exactness.

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👑 RETURN VALUE 👑

explain_munmap_or_die only ever returns on success — for more info, go peek at munmap(2). on failure she prints an explanation and exits, so she does not return. periodt. 💅

explain_munmap_on_error always returns the value returned by the wrapped munmap(2) system call. every single time, no gatekeeping. ✨

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🎀 EXAMPLE 🎀

explain_munmap_or_die is intended to be used in a fashion similar to this lil cutie:

explain_munmap_or_die(data, data_size);

that's it. that's the whole move. iconic, honestly 🌈

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🔥 SEE ALSO 🔥

• munmap(2) — unmap a file or device from memory
• explain_munmap(3) — explain munmap(2) errors
• exit(2) — terminate the calling process

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💜 COPYRIGHT 💜

libexplain version 1.4 Copyright (C) 2010 Peter Miller

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and that's the whole page, bestie 🧚💖 she's from libexplain version 1.4, dated all the way back to 2010 (Copyright (C) 2010 Peter Miller), and yes — explain_munmap_or_die(3) is literally the name at the bottom too, because she contains multitudes 🎀✨