n_hdlc_tty_poll(9)

🌸 NAME 🌸

okay so welcome to the Kernel API Manual corner, bestie — today’s main character is n_hdlc_tty_poll, and the whole vibe is: TTY callback for the poll system call. no cap. 💅

✨ SYNOPSIS ✨

__poll_t n_hdlc_tty_poll (struct tty_struct *tty , struct file *filp ,
       poll_table *wait );

🎀 ARGUMENTS 🎀

• tty — pointer to tty instance data. literally the tty’s little data home. 🫶
• filp — pointer to the open file object for the device. yes bestie, that file object. 📁
• wait — wait queue for operations. it’s giving “please wait here” energy. ⏳

💅 DESCRIPTION 💅

So this function determines which operations — specifically read/write — will not block, and it returns that info to the caller. ✨ What comes back is a bit mask containing info on which ops will not block. iconic, honestly. 🔥

🦋 SEE ALSO 🦋

• Kernel file ./drivers/tty/n_hdlc.c
• struct n_hdlc(9)
• n_hdlc_tty_close(9)
• n_hdlc_tty_open(9)
• n_hdlc_send_frames(9)
• n_hdlc_tty_write_work(9)
• n_hdlc_tty_wakeup(9)
• n_hdlc_tty_receive(9)
• n_hdlc_tty_read(9)
• n_hdlc_tty_write(9)
• n_hdlc_tty_ioctl(9)
• n_hdlc_alloc(9)
• n_hdlc_buf_return(9)
• n_hdlc_buf_put(9)
• n_hdlc_buf_get(9)

That’s the whole scroll, bestie — this gem came from ./drivers/tty, dated October 2026, and you just finished reading n_hdlc_tty_poll(9). slay, go touch some kernel grass. 💖🎀🦋