echo_move_back_col(9)

💅 echo_move_back_col 💅

okay bestie, so this is a page from the Kernel API Manual — section 9, the kernel-API girlies — and it's literally all about one tiny little function that does one tiny little thing. no cap, it's short. but we're gonna give it the full main-character treatment anyway because that's just how we do it here 🫶

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✨ NAME ✨

echo_move_back_col — add operation to move back a column

like… that's it. that's the whole vibe. it adds an operation. the operation moves back a column. iconic, honestly.

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🌸 SYNOPSIS 🌸

void echo_move_back_col (struct n_tty_data *ldata );

yup. returns void (nothing comes back, it's giving "no thoughts, head empty"), takes exactly one pointer, and yes that space before the ) is in the original, we don't fix things here, we respect the source 💀

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🎀 ARGUMENTS 🎀

• ldata — the n_tty data. that's the whole description bestie, that's all we get. it's the n_tty data and the function needs it, periodt.

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🦋 DESCRIPTION 🦋

So the actual tea: this function adds an operation to the echo buffer — the buffer where echoed characters hang out waiting to be written out — and that operation's entire job is to move back one column.

one operation. one column. back. that's the assignment and it ate. 🔥

no extra behaviour, no secret side quests, no "oh but it also does X" — if the page doesn't say it, we don't invent it, fr fr.

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👑 SEE ALSO 👑

okay this is the part where the page goes absolutely feral with cross-references, so buckle up bestie, we're listing every single one 🌈 — these all live in the kernel file ./drivers/tty/n_tty.c:

• 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_set_canon_col(9)
• echo_erase_tab(9)
• echo_char_raw(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… thirty-five references for a function that moves back one column. the confidence is unmatched. 👑

lowkey the real flex here is __process_echoes(9) with the double underscore — she's the one who actually drains the echo buffer, iykyk.

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and that's the whole page, bestie, you're now officially an echo_move_back_col scholar 🧚💜

sign-off time: this little slice of kernel lore comes courtesy of the ./drivers/tty source, dated October 2026, and it's filed under echo_move_back_col(9) in the manual. go forth and echo responsibly 🌸