explain_lseek_or_die(3)

💖 explain_lseek_or_die — bestie edition 💖

okay so this is a page from the Library Functions Manual, and it's all about explain_lseek_or_die, a lil function that repositions your file offset and tells you exactly what went wrong if it can't. no cap, it's giving "helpful friend who also holds you accountable." 🫶

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✨ NAME ✨

explain_lseek_or_die — reposition file offset and report errors

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🌸 SYNOPSIS 🌸

#include <libexplain/lseek.h>
long long explain_lseek_or_die(int fildes, long long offset, int whence);

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💅 DESCRIPTION 💅

So basically, explain_lseek_or_die is the function you call when you want to hit up the lseek(2) system call, but you want receipts if it flops. 🎀

If it fails, an explanation gets printed to stderr — and that explanation is obtained from explain_lseek(3) — and then the process terminates by calling exit(EXIT_FAILURE). yeah. it doesn't just warn you, it ends the whole thing. dramatic? yes. useful? also yes. 💀

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

long long result = explain_lseek_or_die(fildes, offset, whence);

Here's the tea on each argument:

• fildes — the fildes, exactly as to be passed to the lseek(2) system call. no funny business, you hand it over just like that.
• offset — the offset, exactly as to be passed to the lseek(2) system call. same energy, same rule.
• whence — the whence, exactly as to be passed to the lseek(2) system call. yes bestie, this one too.

Returns:

• On successful, returns the resulting offset location as measured in bytes from the beginning of the file. 🦋
• On failure, prints an explanation and exits. that's it. that's the vibe check, and you did not pass it. 😭

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👀 SEE ALSO 👀

• lseek(2) — reposition file offset
• explain_lseek(3) — explain lseek(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 — explain_lseek_or_die(3), signed off with love from libexplain 1.4 and Peter Miller's 2008 copyright. periodt. 💖✨🎀