STRUCT MEDIA_FILE_OPERATIONS(9)

💅 struct media_file_operations(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual and it's literally all about struct media_file_operations — aka the media device file operations ✨ like, the lil' table of function pointers that tells the kernel "hey, here's how you handle read/write/poll/ioctl on this media device node" 🦋

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🌸 NAME 🌸

struct media_file_operations — Media device file operations 💖

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✨ SYNOPSIS ✨

bestie, here's the whole struct, character for character, no cap:

struct media_file_operations {
    struct module *owner;
    ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
    ssize_t (*write) (struct file *, const char __user *, size_t, loff_t
*);
    __poll_t (*poll) (struct file *, struct poll_table_struct *);
    long (*ioctl) (struct file *, unsigned int, unsigned long);
    long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
    int (*open) (struct file *);
    int (*release) (struct file *);
 };

like, look at her. eight members. main character energy 👑 each one is a pointer to a function that implements a syscall for your media device. slay 💅

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🧚 MEMBERS 🧚

• owner — fill this bad boy with THIS_MODULE 💖 that's literally the whole vibe. it's the module reference thingy, and yes, THIS_MODULE is exactly what goes in there.
• read — pointer to the function that implements the read syscall 🍓
• write — pointer to the function that implements the write syscall ✍️
• poll — pointer to the function that implements the poll syscall 🌈
• ioctl — pointer to the function that implements the ioctl syscall 🔥
• compat_ioctl — pointer to the function that will handle 32 bits userspace calls to the ioctl syscall on a Kernel compiled with 64 bits 🫶 iykyk, that's the compatibility layer for the 32-on-64 situation, ngl it's a whole thing
• open — pointer to the function that implements the open syscall 🎀
• release — pointer to the function that will release the resources allocated by the open function 🧹 like, cleanup duty, but make it iconic

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💀 SEE ALSO 💀

all the Kernel file friends over in ./include/media/media-devnode.h, fr fr:

• struct media_devnode(9)
• media_devnode_register(9)
• media_devnode_unregister_prepare(9)
• media_devnode_unregister(9)
• media_devnode_data(9)
• media_devnode_is_registered(9)

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and that's the whole page, bestie! 🦋 this one lives in ./include/media and it's dated October 2026 — so yeah, future vibes 💜 anyway, go forth and register your media devnodes, you're gonna ate 💅✨👑