explain_pwrite_or_die(3)

💖 explain_pwrite_or_die(3) 💖

okay bestie, sit down, hydrate, because we're about to talk about libexplain's very own explain_pwrite_or_die — a Library Functions Manual moment, and honestly? it's giving "I write to your file descriptor at an offset and I will tell you when it goes wrong." 💅

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✨ NAME ✨

explain_pwrite_or_die — seek and write to a file descriptor and report errors 🎀

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🌸 SYNOPSIS 🌸

#include <libexplain/pwrite.h>
ssize_t explain_pwrite_or_die(int fildes, const void *data, size_t data_size, off_t offset);
ssize_t explain_pwrite_on_error(int fildes, const void *data, size_t data_size, off_t offset))

(yes, that last line really does end in a double paren, we are keeping it exactly as it is, no notes 🫶)

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💜 DESCRIPTION 💜

so. the explain_pwrite_or_die function is the one you call when you want to call the pwrite(2) system call, but you also want receipts when it fails. 📝 on failure, an explanation gets printed to stderr, obtained from the explain_pwrite(3) function, and then — and this is the dramatic part — the process terminates by calling exit(EXIT_FAILURE). like, it's done. it does not come back. periodt. 💀

the explain_pwrite_on_error function is the chill sibling: it also calls the pwrite(2) system call, and on failure it also prints an explanation to stderr obtained from the explain_pwrite(3) function — but it still returns to the caller. no exit, no drama, just a little note and a return. 🌈

here are the parameters, each one passed through exactly as-is, no glow-ups, no edits:

• fildes — the fildes, exactly as to be passed to the pwrite(2) system call. 🍓
• data — the data, exactly as to be passed to the pwrite(2) system call. ✨
• data_size — the data_size, exactly as to be passed to the pwrite(2) system call. 🦋
• offset — the offset, exactly as to be passed to the pwrite(2) system call. 🎀

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⭐ RETURN VALUE ⭐

• the explain_pwrite_or_die function only returns on success — see pwrite(2) for more info. on failure it prints an explanation and exits, it does not return. 👑
• the explain_pwrite_on_error function always returns the value return by the wrapped pwrite(2) system call. (yes, "return", we said what we said, it's the original wording and we're keeping it 💖)

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🧚 EXAMPLE 🧚

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

ssize_t result = explain_pwrite_or_die(fildes, data, data_size, offset);

literally just one line and it's doing the most. obsessed. 💅

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🔥 SEE ALSO 🔥

• pwrite(2) — read from or write to a file descriptor at a given offset
• explain_pwrite(3) — explain pwrite(2) errors
• exit(2) — terminate the calling process

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👑 COPYRIGHT 👑

libexplain version 1.4 Copyright (C) 2009 Peter Miller

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no cap, every single flag, param, error path and reference from the original is right here — the vibe is new, the facts are untouched. 🫶

okay that's the whole page bestie, mwah, go call pwrite responsibly 💖✨🎀🦋🌸💅🌈⭐🍓🧚💜