isig(9)

isig(9) — Kernel API Manual 🌈

okay bestie, welcome to the isig page. it's giving kernel tty energy, and honestly? kind of iconic. let's get into it 💅

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🌸 NAME 🌸

isig — handle the ISIG optio

(yes, “optio” — that's literally what the page says, and I'm not fixing the lore, I'm preserving it 💀)

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✨ SYNOPSIS ✨

void isig (int sig , struct tty_struct *tty );

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🧚 ARGUMENTS 🧚

• sig — signal
• tty — terminal

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💖 DESCRIPTION 💖

okay so picture this: a signal is being sent because of terminal input. that's when isig gets called, bestie. it's called from the tty_driver.receive_buf path, so it's serialized — no chaotic parallel vibes here ✨

it performs input and output flush if !NOFLSH. in this context, the echo buffer is 'output'. the signal is processed first so it can alert any current readers or writers to discontinue and exit their i/o loops.

Locking: ctrl.lock

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🦋 SEE ALSO 🦋

Kernel file: ./drivers/tty/n_tty.c

the whole squad, no cap:

• 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_raw(9)
• echo_char(9)
• finish_erasing(9)
• eraser(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)

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okay bye bestie 🫶💖 the footer says source/version ./drivers/tty, date October 2026, and yeah, isig(9) again because it's the main character 🎀✨