message_store(9)

🎀 NAME 🎀

message_store — write a new message via sysfs. Bestie, welcome to message_store(9) from the Kernel API Manual: it’s literally the sysfs hook that writes a new message. Periodt. 💅

🌈 SYNOPSIS 🌈

ssize_t message_store (struct device *dev , struct device_attribute
       *attr , const char *buf , size_t count );

🧚 ARGUMENTS 🧚

• dev — the display device. That’s the device in question, no cap.
• attr — the display message attribute. The display-message attribute, exactly as advertised.
• buf — the buffer containing the new message. Your new message lives here.
• count — the size of the message in buf. Yep, the count of that message.

💅 DESCRIPTION 💅

Okay so message_store writes a new message to display or scroll across the display from sysfs. That’s the whole vibe: new message in, display-or-scroll out. Slay. ✨

🎀 RETURN 🎀

It returns the size of the message on success, else -ERRNO. Iconic when it works, dramatic sigh when it doesn’t. 😭

🦋 SEE ALSO 🦋

Kernel file ./drivers/auxdisplay/line-display.c, plus these besties:

• struct linedisp_attachment(9)
• linedisp_scroll(9)
• linedisp_display(9)
• message_show(9)
• linedisp_attach(9)
• linedisp_detach(9)
• linedisp_register(9)
• linedisp_unregister(9)

Source/version vibes: this page lives under ./drivers/auxdisplay, dated October 2026, and yes bestie, it’s the message_store(9) man page. Bye, go write that message 💖🫶