ev_byte_channel_receive(9)

💖 ev_byte_channel_receive(9) — the Kernel API Manual page, bestie edition 🎀

Okay so this is the ev_byte_channel_receive(9) page from the Kernel API Manual, and it is literally the whole vibe for grabbing characters out of a byte channel. Let's get into it ✨

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🌸 NAME 🌸

ev_byte_channel_receive — fetch characters from a byte channel

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✨ SYNOPSIS ✨

unsigned int ev_byte_channel_receive (unsigned int handle , unsigned int
*count , char buffer[EV_BYTE_CHANNEL_MAX_BYTES] );

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🫶 ARGUMENTS 🫶

• handle — the byte channel handle. It's giving "your ticket to the channel" energy 🎟️
• count — lowkey a two-way street: on input it's the max num of chars to receive, and on output it's the num chars actually received 💅
• buffer — pointer to a 16-byte buffer. Yes, sixteen. We'll get to why, don't worry 😌

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💜 DESCRIPTION 💜

Bestie, hear me out: the size of buffer must be at least 16 bytes, even if you request fewer than 16 characters. Not a suggestion, not a recommendation — it's the rule. Because we always write 16 bytes to buffer. Always. Even when you're like "but I only asked for 3," it's still writing 16. This is for performance reasons, and honestly? iconic behavior ⚡

Returns 0 for success, or an error code. Simple as that. Periodt 💅

⚠️ Do not skimp on the buffer size. 16 bytes minimum, every time, or things go sideways in the worst way 😭

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👑 SEE ALSO 👑

• Kernel file ./arch/powerpc/include/asm/epapr_hcalls.h
• ev_int_set_config(9)
• ev_int_get_config(9)
• ev_int_set_mask(9)
• ev_int_get_mask(9)
• ev_int_eoi(9)
• ev_byte_channel_send(9)
• ev_byte_channel_poll(9)
• ev_int_iack(9)
• ev_doorbell_send(9)
• ev_idle(9)

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Alright bestie, that's the whole page! This one lives in ./arch/powerpc/include/asm, dated October 2026, and it's legit part of the Kernel API Manual — go off and use it responsibly. Slay! 🦋💖🌸