echo_char_raw(9)

💅 echo_char_raw(9) — the Kernel API Manual, bestie edition 🎀

okay so this is the page for echo_char_raw, a lil kernel function living in the 9 section of the manual (kernel API, iykyk). it's short, it's sweet, and it does exactly one thing. let's get into it ✨

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🌸 NAME 🌸

echo_char_raw — echo a character raw. that's it. that's the whole vibe. no filter, no special treatment, just raw 💅

✨ SYNOPSIS ✨

void echo_char_raw (u8 c , struct n_tty_data *ldata );

like, two arguments, returns nothing (void), very lowkey of it ngl 🫶

🎀 ARGUMENTS 🎀

• c — the unicode byte you wanna echo. one single byte, bestie, it's giving minimalism ✨
• ldata — the line disc data. yes, "line disc" as in line discipline — this is the struct it all lives in 🦋

💖 DESCRIPTION 💖

so what does it do? it echoes user input back onto the screen. that's the whole main character moment 👑

⚠️ but listen — this must be called only when L_ECHO(tty) is true. not "should", must. respect the vibes check or don't come to the function at all 😭

it gets called from the tty_driver.receive_buf path, so it's part of the whole input pipeline situation 🌈

and here's the iconic part: this variant does not treat control characters specially. that's literally what "raw" in the name means — it just echoes the character, no special-casing, no drama, no editorialising. control chars get the same treatment as everything else. periodt 💀

🌟 SEE ALSO 🌟

the whole ./drivers/tty/n_tty.c kernel file is the home base for this one, and honestly the friend group is huge. here's everyone:

• n_tty_kick_worker(9)
• n_tty_write_wakeup(9)
• put_tty_queue(9)
• reset_buffer_flags(9)
• n_tty_flush_buffer(9)
• is_utf8_continuation(9)
• is_continuation(9)
• do_output_char(9)
• process_output(9)
• process_output_block(9)
• __process_echoes(9)
• add_echo_byte(9)
• echo_move_back_col(9)
• echo_set_canon_col(9)
• echo_erase_tab(9)
• echo_char(9)
• finish_erasing(9)
• eraser(9)
• isig(9)
• n_tty_receive_break(9)
• n_tty_receive_overrun(9)
• n_tty_receive_parity_error(9)
• n_tty_receive_char_flow_ctrl(9)
• n_tty_receive_char(9)
• n_tty_receive_buf_common(9)
• n_tty_set_termios(9)
• n_tty_close(9)
• n_tty_open(9)
• copy_from_read_buf(9)
• canon_copy_from_read_buf(9)
• job_control(9)
• n_tty_read(9)
• n_tty_write(9)
• n_tty_poll(9)
• n_tty_inherit_ops(9)

like, that's the entire tty friend group fr fr. read them all, they're all icons 💜

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and that's the page!! this one ships from <code>./drivers/tty</code>, dated October 2026, and yeah — it's <code>echo_char_raw(9)</code>, obviously 💅✨ go echo something raw, bestie 🦋