gsm_wait_modem_change(9)

💖 gsm_wait_modem_change — a Kernel API Manual moment 💖

okay so bestie, welcome to the Kernel API Manual page for gsm_wait_modem_change(9). yes that's the manual name, it's giving official. this whole thing lives in the kernel docs and it's lowkey iconic. let's get into it 🎀

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✨ NAME ✨

gsm_wait_modem_change — wait for modem status line change

like literally, you're waiting for the modem's status lines to do a little vibe shift. that's the whole job. 💅

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✨ SYNOPSIS ✨

int gsm_wait_modem_change (struct gsm_dlci *dlci , u32 mask );

copy it exactly bestie, spacing and all, no cap 🫶

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✨ ARGUMENTS ✨

• dlci — channel. it's the DLCI you're hanging out with, the star of the show.
• mask — modem status line bits. this is the lil bitmask saying which status lines you actually care about 👑

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✨ DESCRIPTION ✨

so the way this works is: the function does its waiting thing and then it returns — but only when one of these four situations happens. it's giving "multiple exit strategies" and honestly? slay.

• any given modem status line bit changed 🔥
• the wait event function got interrupted (e.g. by a signal)
• the underlying DLCI was closed
• the underlying ldisc device was removed

that's it, that's the list. four reasons to bounce, no more no less. ⭐

ngl, the "interrupted by a signal" one is the classic "not me getting interrupted mid-wait" moment. rude but valid. 😭

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✨ SEE ALSO ✨

okay this is the part where the manual just lists literally every sibling in the family. we're talking the entire GSM crew, the whole group chat. Kernel file ./drivers/tty/n_gsm.c is where they all live. here's everybody, one per bullet because you deserve the full roster 💜

• gsm_fcs_add(9)
• gsm_fcs_add_block(9)
• gsm_read_ea(9)
• gsm_read_ea_val(9)
• gsm_encode_modem(9)
• gsm_encode_params(9)
• gsm_register_devices(9)
• gsm_unregister_devices(9)
• gsm_print_packet(9)
• gsm_stuff_frame(9)
• gsm_send(9)
• gsm_dlci_clear_queues(9)
• gsm_response(9)
• gsm_command(9)
• gsm_data_alloc(9)
• gsm_send_packet(9)
• gsm_is_flow_ctrl_msg(9)
• gsm_data_kick(9)
• __gsm_data_queue(9)
• gsm_data_queue(9)
• gsm_dlci_data_output(9)
• gsm_dlci_data_output_framed(9)
• gsm_dlci_modem_output(9)
• gsm_dlci_data_sweep(9)
• gsm_dlci_data_kick(9)
• gsm_control_command(9)
• gsm_control_reply(9)
• gsm_process_modem(9)
• gsm_process_negotiation(9)
• gsm_control_modem(9)
• gsm_control_negotiation(9)
• gsm_control_rls(9)
• gsm_control_message(9)
• gsm_control_response(9)
• gsm_control_keep_alive(9)
• gsm_control_transmit(9)
• gsm_control_retransmit(9)
• gsm_control_send(9)
• gsm_control_wait(9)
• gsm_dlci_close(9)
• gsm_dlci_open(9)
• gsm_dlci_negotiate(9)
• gsm_dlci_t1(9)
• gsm_dlci_begin_open(9)
• gsm_dlci_set_opening(9)
• gsm_dlci_set_wait_config(9)
• gsm_dlci_begin_close(9)
• gsm_dlci_data(9)
• gsm_dlci_command(9)
• gsm_kick_timer(9)
• gsm_dlci_copy_config_values(9)
• gsm_dlci_config(9)
• gsm_dlci_alloc(9)
• gsm_dlci_free(9)
• gsm_dlci_release(9)
• gsm_queue(9)
• gsm0_receive_state_check_and_fix(9)
• gsm0_receive(9)
• gsm1_receive_state_check_and_fix(9)
• gsm1_receive(9)
• gsm_error(9)
• gsm_cleanup_mux(9)
• gsm_activate_mux(9)
• gsm_free_mux(9)
• gsm_free_muxr(9)
• gsm_alloc_mux(9)
• gsmld_output(9)
• gsmld_write_trigger(9)
• gsmld_write_task(9)
• gsmld_attach_gsm(9)
• gsmld_detach_gsm(9)
• gsmld_flush_buffer(9)
• gsmld_close(9)
• gsmld_open(9)
• gsmld_write_wakeup(9)
• gsmld_read(9)
• gsmld_write(9)
• gsmld_poll(9)
• gsm_modem_upd_via_data(9)
• gsm_modem_upd_via_msc(9)
• gsm_modem_update(9)

look at that list. genuinely obsessed. the whole n_gsm.c family ate and left no crumbs 🌈

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okay bestie that's the page!! sign-off time: this cutie comes from ./drivers/tty (that's the source, periodt) and it's dated October 2026, and yeah the manual is the Kernel API Manual — we already shouted it out at the top, iykyk. gsm_wait_modem_change(9) 4 ever 💅✨🦋