mux_tx_empty(9)

💅 mux_tx_empty(9) 💅

okay so this is a page from the Kernel API Manual, and honestly? she's a little legend. we're talking about mux_tx_empty — the girl who checks if the transmitter fifo is empty. tiny job, huge main character energy. 🎀

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✨ NAME ✨

mux_tx_empty — check if the transmitter fifo is empty. no cap, that's literally the whole gig. 🦋

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🌸 SYNOPSIS 🌸

unsigned int mux_tx_empty (struct uart_port *port );

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🧚 ARGUMENTS 🧚

• port — ptr to the uart_port. like, the actual port we're vibing with. you gotta hand her the pointer, bestie, she can't read minds. 💜

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🔥 DESCRIPTION 🔥

so what she does is: this function tests if the transmitter fifo for the port described by 'port' is empty. that's the vibe check. 🫶

and then:

• if it is empty → this function should return TIOCSER_TEMT ✨ (slay, the buffer's clear)
• otherwise → return 0 💀 (nope, still stuff in there)

that's it. that's the whole function. iconic behaviour, honestly. lowkey obsessed with how simple she is. 👑

ngl, "should return" is doing some heavy lifting here — that's the spec talking, not a promise the universe made to you. 🙈

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🌈 SEE ALSO 🌈

kernel file ./drivers/tty/serial/mux.c — and the whole mux friend group, fr fr:

• get_mux_port_count(9)
• mux_set_mctrl(9)
• mux_get_mctrl(9)
• mux_stop_tx(9)
• mux_start_tx(9)
• mux_stop_rx(9)
• mux_break_ctl(9)
• mux_write(9)
• mux_read(9)
• mux_startup(9)
• mux_shutdown(9)
• mux_set_termios(9)
• mux_type(9)
• mux_release_port(9)
• mux_request_port(9)
• mux_config_port(9)
• mux_verify_port(9)
• mux_poll(9)
• mux_probe(9)
• mux_init(9)
• mux_exit(9)

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and that's the whole page, bestie!! 🎀✨ she lives in ./drivers/tty/serial and this cutie is dated October 2026 — so yeah, go read the whole mux squad, iykyk 💖🌸🦋💅