IBRDA(3)

💖 IBRDA(3) — reading data bytes asynchronously, but make it unbothered ✨

okay bestie, this is ibrda, from the Traditional API Functions corner of the linux-gpib manual. she's the async twin of ibrd and she has zero patience. let's get into it 💅

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✨ NAME ✨

ibrda — read data bytes asynchronously (board or device) 🦋

🌸 SYNOPSIS 🌸

#include <gpib/ib.h>

int ibrda(int ud, void *buffer, long num_bytes);

💫 DESCRIPTION 💫

so ibrda() is basically ibrd() but with main character energy — it operates asynchronously. the way that ibrd() would sit there and wait for the data bytes to arrive?? ibrda() does not do that. she does not wait for the reception of the data bytes to complete. she returns immediately. periodt. 🔥

heads up though — while an asynchronous operation is in progress, most library functions will fail with an EOIP error. so like, don't go spam-calling other stuff mid-read, she will NOT be nice about it 😭

to successfully complete an asynchronous operation and resynchronize its results with the current thread, you have to call ibwait() with CMPL set in the wait mask, and keep doing that until the CMPL bit is set in ibsta. slay. ✨

asynchronous operations may also be completed by a call to ibstop() or a ibonl() call. also!! note that ibwait() will only complete the asynchronous operation if you explicitly set the CMPL bit in the wait mask parameter of ibwait(). no sneaky defaults, you gotta say it out loud 🗣️

once the asynchronous I/O has completed and the results are resynchronized with the current thread, the Linux-GPIB extensions AsyncIbsta, AsyncIberr, AsyncIbcnt, and AsyncIbcntl may be useful — they let you more cleanly separate the results of the asynchronous I/O from the results of the ibwait() or similar call you used to resynchronize. it's giving organized. it's giving "I labeled my bins." 🎀

⭐ RETURN VALUE ⭐

the value of ibsta is returned. that's it, that's the whole tea 🍓

👑 COPYRIGHT 👑

Copyright © 2003-2006, 2008 Frank Mori Hess

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and that's the whole page, bestie 🫶 shoutout to linux-gpib 4.3.7, dated 07/06/2026 — go forth and read asynchronously, you absolute icon 💜🧚