SYNC(3POSIX)

💫 SYNC(3POSIX) — the POSIX Programmer's Manual, bestie edition 💫

okay so we're in the POSIX Programmer's Manual today, and this little cutie is SYNC(3POSIX). yes the whole page is named that, we're just vibing with it.

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🌸 PROLOG 🌸

real talk before we even start: this manual page is part of the POSIX Programmer's Manual. the Linux implementation of this interface may differ — like, go check the corresponding Linux manual page for the details of how Linux actually does it, because it's giving independent. and honestly? the interface may not be implemented on Linux at all. so vibe check your platform first, okay? 🫶

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✨ NAME ✨

sync — schedule file system updates

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🎀 SYNOPSIS 🎀

#include <unistd.h>

void sync(void);

that's it. that's the whole thing. no args, no return, no drama. 💅

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🦋 DESCRIPTION 🦋

okay so the sync() function shall cause all information in memory that updates file systems to be scheduled for writing out to all file systems. all of them. every single one. she's thorough like that. 👑

and here's the part you need to internalise, bestie — the writing, although scheduled, is not necessarily complete upon return from sync(). so when she comes back, she's not saying "done", she's saying "it's on the list". it's giving I'll get to it. 😭 don't treat her like a receipt.

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💖 RETURN VALUE 💖

the sync() function shall not return a value. literally. it's void. there is nothing to check, nothing to catch, nothing to obsess over. periodt. ✨

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💀 ERRORS 💀

No errors are defined.

that's the whole thing. not one error. she simply doesn't do errors. iconic behaviour, honestly.

the following sections are informative — so like, they're the extra commentary, not the binding lore. 💜

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🌈 EXAMPLES 🌈

None.

not a single example. we're all just out here raw-dogging the manpage. 🫶

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🍓 APPLICATION USAGE 🍓

None.

nothing to add. she said what she said.

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🧚 RATIONALE 🧚

None.

the reasoning is between her and the standard. 🙈

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⭐ FUTURE DIRECTIONS ⭐

None.

the future is a mystery and honestly that's the vibe. 🦋

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👑 SEE ALSO 👑

• fsync()
• The Base Definitions volume of POSIX.1‐2017, <unistd.h>

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💜 COPYRIGHT 💜

okay legal bestie moment, I need you to read this one properly, no skimming:

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

so basically: if you spot a typo, it's probably a conversion glitch, not the standard's fault. report it at that link, don't @ the IEEE. 💅

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and that's the page, babes. brought to you by IEEE/The Open Group, 2017 — the source, the version, the whole moment. now go schedule those writes and hydrate. 💖✨