IBRSV(3)

💖 IBRSV(3) 💖

okay bestie, gather round, we're doing the Traditional API Functions thing and this one is literally called ibrsv — you use it to request service (board). 🫶 she's cute, she's classic, she's a little chaotic. let's go.

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✨ SYNOPSIS ✨

#include <gpib/ib.h>

int ibrsv(int ud, int status_byte);

like, two args, one int back, we love a low-effort queen. 💅

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🌸 DESCRIPTION 🌸

so here's the vibe. you've got your board, right? it's identified by its board descriptor, ud. you call ibrsv and it sets that board's serial poll response byte to whatever you passed in as status_byte. that's it, that's the whole assignment. 🎀

now the ✨drama✨ is all in bit 6:

• if MSS (which is bit 6 in status_byte) is set, then the IEEE 488.2 local message "reqt" goes true — and that makes the board actually request service by asserting the SRQ line. she's raising her hand in class, periodt. 🙋‍♀️
• if the MSS bit is clear, then the "reqf" message goes true instead, and the board stops requesting service. phew, she's chilling now. 😌

oh and also (this part is not on you, she does it herself): boards will automatically stop requesting service when they are serial polled by the controller. so the controller just has to look at her and the SRQ goes away. iconic behaviour honestly.

⚠️ real talk though — this function follows the implementation technique described in IEEE 488.2 section 11.3.3.4.3. and that technique is... lowkey messy. it's prone to generating spurious requests for service, which are technically permitted by 488.2 but, and I quote the vibes here, less than ideal. 😭 so if you want to avoid spurious requests, use ibrsv2() instead. no cap. that's the glow-up version. ✨

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👑 RETURN VALUE 👑

the value of ibsta is returned. that's the whole answer bestie, she gives you ibsta and you go check it like a good little programmer. 💜

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🎀 COPYRIGHT 🎀

Copyright © 2003-2006, 2008 Frank Mori Hess

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okay that's the whole page, you ate that fr fr 🍓

sign-off time: this beauty lives in linux-gpib 4.3.7 and the date on the tag is 07/06/2026 — so yeah, she's still out here doing her thing. now go use ibrsv2() unless you specifically need the messy one, iykyk. bye bestie!! 💖✨🌈🦋💅