trace_seq_bprintf(9)

✨ trace_seq_bprintf(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 and today's main character is trace_seq_bprintf — yes that's the whole name, it's iconic like that 🎀

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🌸 NAME 🌸

trace_seq_bprintf — writes the printf string from binary arguments, no cap 💖

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🦋 SYNOPSIS 🦋

void trace_seq_bprintf (struct trace_seq *s , const char *fmt , const u32 *binary );

like, that's literally it. three args, one void return, zero drama ✨

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🎀 ARGUMENTS 🎀

• s — the trace sequence descriptor, your little buffer bestie 🫶
• fmt — the format string for the binary arguments, aka the blueprint 📋
• binary — the binary arguments for fmt, the raw receipts 💀

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👑 DESCRIPTION 👑

ok so picture this: you're recording in a fast path 🔥 and you've got a printf that needs to happen. now, you could waste cycles converting the arguments into ASCII characters right there on the spot… but why would you do that to yourself, honestly? 🙈 lowkey tragic.

instead, the arguments get saved in a 32 bit word array that's defined by the format string constraints — the format string says what goes where, and the array just holds the vibes (the raw values) 💜

then this function comes in and does the glow-up: it takes the format and the binary array and finishes the conversion into the ASCII string within the buffer 🌈✨ she's the closer, fr fr.

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💅 SEE ALSO 💅

Kernel file ./kernel/trace/trace_seq.c — go read it, iykyk 📖

and the whole squad, periodt:

• trace_print_seq(9)
• trace_seq_printf(9)
• trace_seq_bitmask(9)
• trace_seq_bitmask_list(9)
• trace_seq_vprintf(9)
• trace_seq_puts(9)
• trace_seq_putc(9)
• trace_seq_putmem(9)
• trace_seq_putmem_hex(9)
• trace_seq_path(9)
• trace_seq_to_user(9)

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okay that's the whole page, you ate it up bestie 🍓 this lil beauty lives over in ./kernel/trace and was dated October 2026 in the Kernel API Manual — mwah, go forth and convert those binary args into ASCII 🌟💖🦋