hvc_iucv_notifier_hangup(9)

🎀 NAME 🎀

okay so bestie, welcome to the Kernel API Manual page for hvc_iucv_notifier_hangup(9) — it’s the HVC notifier for TTY hangups. That’s the whole vibe: TTY hangup happens, and this routine handles the notifier moment. 💅

✨ SYNOPSIS ✨

void hvc_iucv_notifier_hangup (struct hvc_struct *hp , int id );

🫶 ARGUMENTS 🫶

• hp — Pointer to the HVC device (struct hvc_struct). This is the device bestie in question. 🦋
• id — Additional data (originally passed to hvc_alloc): the index of an struct hvc_iucv_private instance. It’s literally the little identifier that came in through hvc_alloc. ✨

💅 DESCRIPTION 💅

This routine notifies the HVC back-end that a tty hangup (carrier loss, virtual or otherwise) has occurred. So yeah, it’s giving “heads up, the tty hung up” energy. 📣

The z/VM IUCV HVC device driver ignores virtual hangups (vhangup) to keep an existing IUCV communication path established. (Background: vhangup is called from user space (by getty or login) to disable writing to the tty by other applications). So it’s very much a “not today, virtual hangup” situation. 🙈

If the tty has been opened and an established IUCV path has been severed (we caused the tty hangup), the function calls hvc_iucv_cleanup. That’s the cleanup era, periodt. 🧹

Locking: struct hvc_iucv_private->lock

🔥 SEE ALSO 🔥

The kernel file is ./drivers/tty/hvc/hvc_iucv.c, and here’s the full bestie roll call, in order:

• hvc_iucv_get_private(9)
• alloc_tty_buffer(9)
• destroy_tty_buffer(9)
• destroy_tty_buffer_list(9)
• hvc_iucv_write(9)
• hvc_iucv_get_chars(9)
• hvc_iucv_queue(9)
• hvc_iucv_send(9)
• hvc_iucv_sndbuf_work(9)
• hvc_iucv_put_chars(9)
• hvc_iucv_notifier_add(9)
• hvc_iucv_cleanup(9)
• tty_outqueue_empty(9)
• flush_sndbuf_sync(9)
• hvc_iucv_hangup(9)
• hvc_iucv_dtr_rts(9)
• hvc_iucv_notifier_del(9)
• hvc_iucv_filter_connreq(9)
• hvc_iucv_path_pending(9)
• hvc_iucv_path_severed(9)
• hvc_iucv_msg_pending(9)
• hvc_iucv_msg_complete(9)
• hvc_iucv_alloc(9)
• hvc_iucv_destroy(9)
• hvc_iucv_parse_filter(9)
• hvc_iucv_setup_filter(9)
• param_set_vmidfilter(9)
• param_get_vmidfilter(9)
• hvc_iucv_init(9)
• hvc_iucv_config(9)

okay that’s the page, bestie — source/version tag is ./drivers/tty/hvc, date is October 2026, and we were just reading hvc_iucv_notifier_hangup(9). mwah 💋✨