n_hdlc_send_frames(9)

💅 n_hdlc_send_frames — the Kernel API Manual (section 9, bestie) 🌸

okay so real talk, we're in Kernel API Manual territory, section 9, and today's main character is n_hdlc_send_frames. she's a function, she's a whole vibe, and she pushes frames out. let's get into it ✨

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🎀 NAME 🎀

n_hdlc_send_frames — send frames on the pending send buffer list like it's her job (it literally is) 💅

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✨ SYNOPSIS ✨

void n_hdlc_send_frames (struct n_hdlc *n_hdlc , struct tty_struct *tty
);

no return value, she just does the thing. void queen 🫶

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🦋 ARGUMENTS 🦋

• n_hdlc — pointer to the ldisc instance data, iykyk 🌈
• tty — pointer to the tty instance data, bestie fr fr 🌸

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🔥 DESCRIPTION 🔥

okay so here's the tea: n_hdlc_send_frames sends frames on the pending send buffer list until the driver does not accept a frame (busy). so basically she keeps going until the driver's like "nope, busy, not today" 💀 and that's the stopping point, no cap.

and when does this function get called? two moments, bestie, both iconic 👑

1. after adding a frame to the send buffer list 🎀
2. by the tty wakeup callback ⭐

that's the whole flow. she shows up, she sends what she can, the driver says when. periodt. 💜

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👑 SEE ALSO 👑

the whole friend group, all of them, no one left out 🫶:

• Kernel file ./drivers/tty/n_hdlc.c
• struct n_hdlc(9)
• n_hdlc_tty_close(9)
• n_hdlc_tty_open(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_tty_poll(9)
• n_hdlc_alloc(9)
• n_hdlc_buf_return(9)
• n_hdlc_buf_put(9)
• n_hdlc_buf_get(9)

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and that's the page, bestie! 💖 this one lives under ./drivers/tty, it's dated October 2026, and you can find her filed as n_hdlc_send_frames(9) — go off, manual page, you ate 🔥👑💅