dvb_usercopy(9)

✨ NAME ✨

dvb_usercopy — copies data from/to userspace memory when an ioctl is issued. 💅

Okay bestie, welcome to the dvb_usercopy(9) page from the Kernel API Manual — it’s giving “tiny but crucial kernel sidekick” energy, and honestly? Obsessed. 🫶

🛠️ SYNOPSIS 🛠️

int dvb_usercopy (struct file *file , unsigned int cmd , unsigned long
arg , int (*func)(struct file *file, unsigned int cmd, void *arg) );

🎀 ARGUMENTS 🎀

• file — pointer to struct file. Like, the file situation, bestie. 📁
• cmd — the Ioctl name. 🏷️
• arg — the Ioctl argument. 🎯
• func — the function that will actually handle the ioctl. She’s the one doing the real work, fr fr. 💪

💖 DESCRIPTION 💖

So this is an ancillary function — a little helper with main-character energy — that uses the ioctl direction and size to copy from userspace. Then it calls func, and, if needed, data gets copied back to userspace. ✨

Lowkey iconic: it’s the copy-in, call-the-handler, copy-back-out situation. No cap. 🌀

👀 SEE ALSO 👀

The whole SEE ALSO squad, straight from the kernel file ./include/media/dvbdev.h:

• enum dvb_device_type(9)
• struct dvb_adapter(9)
• struct dvb_device(9)
• struct dvbdevfops_node(9)
• dvb_device_get(9)
• dvb_device_put(9)
• dvb_register_adapter(9)
• dvb_unregister_adapter(9)
• dvb_register_device(9)
• dvb_remove_device(9)
• dvb_unregister_device(9)
• dvb_create_media_graph(9)
• dvb_register_media_controller(9)
• dvb_get_media_controller(9)
• dvb_generic_open(9)
• dvb_generic_release(9)
• dvb_generic_ioctl(9)
• dvb_module_probe(9)
• dvb_module_release(9)
• dvb_attach(9)
• dvb_detach(9)

mwah 💖 this lil page lives under ./include/media, it’s dated October 2026, and its manual-page name is dvb_usercopy(9) — periodt. 🎀🦋