mei_fasync(9)

🎀 mei_fasync(9) — Kernel API Manual 🎀

okay so bestie, welcome to the mei_fasync page. It’s literally the asynchronous io support situation, and everything you need is right here. No cap. 💖

🌸 NAME 🌸

mei_fasync — asynchronous io support. That’s the vibe. ✨

✨ SYNOPSIS ✨

int mei_fasync (int fd , struct file *file , int band );

Copy that exactly, bestie — spacing and all. 🎀

💅 ARGUMENTS 💅

• fd — file descriptor. The little handle for the file, fr fr. 💖
• file — pointer to file structure. It’s struct file *, and the pointer is doing main character energy. 🦋
• band — band bitmap. Yes, bitmap. Not a band. 💅

🫶 RETURN 🫶

• negative on error 😭
• 0 if it did no changes 🫧
• positive — a process was added or deleted 🔥

So: negative = error, 0 = no changes, positive = a process got added or deleted. Periodt. 👑

🔥 SEE ALSO 🔥

Kernel file ./drivers/misc/mei/main.c, plus all these iconic references:

• mei_open(9)
• mei_cl_vtag_remove_by_fp(9)
• mei_release(9)
• mei_read(9)
• mei_cl_vtag_by_fp(9)
• mei_write(9)
• mei_ioctl_connect_client(9)
• mei_vt_support_check(9)
• mei_ioctl_connect_vtag(9)
• mei_ioctl_client_notify_request(9)
• mei_ioctl_client_notify_get(9)
• mei_ioctl(9)
• mei_poll(9)
• mei_cl_is_write_queued(9)
• mei_fsync(9)
• trc_show(9)
• fw_status_show(9)
• hbm_ver_show(9)
• hbm_ver_drv_show(9)
• fw_ver_show(9)
• dev_state_show(9)
• mei_set_devstate(9)
• kind_show(9)
• mei_minor_get(9)
• mei_minor_free(9)

— from ./drivers/misc/mei · October 2026 · mei_fasync(9) 💅✨