job_control(9)

job_control(9) — check job control 🎀

okay so bestie, this one is straight outta the Kernel API Manual, and it’s literally called job_control(9). iconic. let’s get into it. ✨

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🌸 NAME 🌸

job_control — check job control

✨ SYNOPSIS ✨

int job_control (struct tty_struct *tty , struct file *file );

🎀 ARGUMENTS 🎀

• tty — tty. that’s the whole note, bestie, no cap. 🫶
• file — file handle.

💖 DESCRIPTION 💖

okay so what it does: it performs job control management checks on this file/tty descriptor, and if it’s appropriate, it sends any needed signals. it also returns a negative error code if action should be taken. that’s the vibe. 💅

🔒 Locking 🔒

locking notes, and they are giving safety-girl summer:

• the redirected write test is safe
• the current->signal->tty check is safe
• ctrl.lock is what you use to safely reference tty->ctrl.pgrp

🦋 SEE ALSO 🦋

Kernel file ./drivers/tty/n_tty.c and the whole crew:

• 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)
• 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)
• n_tty_read(9)
• n_tty_write(9)
• n_tty_poll(9)
• n_tty_inherit_ops(9)

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💌 cute little sign-off: this page lives in ./drivers/tty, it’s dated October 2026, and yes bestie, it’s still job_control(9). mwah 💋✨