sysfs_mbox_read(9)

📦 version 7.3.1, in nixpkgs unstable

💖 sysfs_mbox_read(9) 💖

okay bestie, so this is sysfs_mbox_read(9) from the Kernel API Manual, and listen — she's a little bit of a relic, but we're gonna treat her with respect anyway 🫶

✨ NAME ✨

sysfs_mbox_read — the read method for reading information via mbox. that's it, that's the whole vibe 🎀

🌸 SYNOPSIS 🌸

ssize_t sysfs_mbox_read (struct file *filp , struct kobject *kobj ,
       const struct bin_attribute *bin_attr , char *buf , loff_t off , size_t
       count );

🦋 ARGUMENTS 🦋

  • filp — the open sysfs file. literally the file handle in question 💅
  • kobj — the kernel kobject that contains the kernel class device. she's the container, the mothership, the one holding it all together.
  • bin_attr — the kernel attributes passed to us. hand-delivered, no cap.
  • buf — contains the data to be read from sysfs mbox. this is where the goods live 🍓
  • off — offset into the buffer to the beginning of the data. like a little bookmark saying "start here".
  • count — bytes to transfer. how much we're taking, fr fr.

🔥 DESCRIPTION 🔥

so here's the tea, and I need you to hear me on this one:

Deprecated function. like, actually deprecated. not "eh maybe don't" deprecated — deprecated deprecated. 😭

all mailbox access from user space is performed via the bsg interface. that's the way now. that's the main character. sysfs_mbox_read is giving "I was relevant in a different era" energy 💀

⭐ RETURN ⭐

  • -EPERM — operation not permitted. yeah. that's the one value listed. she said no 🙈

🌈 SEE ALSO 🌈

okay so this list is long — like, scroll-for-a-while long — but every single one of these is part of the family, so we're naming them all. no skipping, no "etc.", all of them 👑

the kernel file lives at ./drivers/scsi/lpfc/lpfc_attr.c btw 📁

like I said. the whole family. 🧚

and that's the page, bestie 🎀 this lil diva came from ./drivers/scsi/lpfc, dated October 2026 — so jot that down, cite it right, and go read about bsg instead, mwah 💜✨

📦 where this page comes from