nbd_aio_notify_read(3)

💅 nbd_aio_notify_read — bestie's guide to the libnbd(3) manual page ✨

okay so this is nbd_aio_notify_read(3) from the libnbd manual, and honestly it's a little cutie. let's get into it 🫶

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🌸 NAME 🌸

nbd_aio_notify_read — notify that the connection is readable. that's literally the whole job. she's an informer 💅

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✨ SYNOPSIS ✨

here's the summoning ritual, copy it exactly bestie:

#include <libnbd.h>

int nbd_aio_notify_read (
      struct nbd_handle *h
    );

one argument, one int back. she's low maintenance, we love that for her 🎀

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🦋 DESCRIPTION 🦋

so what does she actually do? she sends a notification to the state machine that the connection is readable. that's it. that's the vibe.

like, typically you call her after your main loop has detected that the file descriptor associated with this connection is readable. your loop noticed something, and now she goes and tells the state machine about it. a little messenger girl, a little gossip relay, no cap 📬

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⭐ RETURN VALUE ⭐

• if the call is successful, she returns 0 — slay, we love a clean zero ✨

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💀 ERRORS 💀

• on error, -1 is returned 😭

if you need the tea on what actually went wrong, refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.

heads up bestie: the following parameters must not be NULL: "h". for more info see "Non-NULL parameters" in libnbd(3). don't hand her a null handle, she will NOT be okay 🙈

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👑 VERSION 👑

this function first appeared in libnbd 1.0. vintage. iconic. the way she's been serving since day one 💜

if you need to test if this function is available at compile time, check if the following macro is defined:

#define LIBNBD_HAVE_NBD_AIO_NOTIFY_READ 1

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🌈 SEE ALSO 🌈

go read these next, i'm obsessed:

• nbd_create(3)
• libnbd(3)

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🎀 AUTHORS 🎀

the legends themselves:

• Eric Blake
• Richard W.M. Jones

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🍓 COPYRIGHT 🍓

Copyright Red Hat 🧚

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💖 LICENSE 💖

okay so legally speaking, and i'm reading this straight off the page:

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 💌

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k bye bestie, go notify some reads 🦋💅 — this page brought to you by libnbd-1.25.8, dated 2026-10-13, and it's giving reference material, fr fr 🌸