wdt_open(9)

🎀 NAME 🎀

okay so welcome to the Kernel API Manual, bestie — this page is wdt_open(9), and the NAME line is literally just:

wdt_open -

...that’s it. No extra description after the dash, no secret subtitle, just the name and the dash doing its little thing 💅.

💖 SYNOPSIS 💖

int wdt_open (struct inode *inode , struct file *file );

🌸 ARGUMENTS 🌸

• inode — inode of device. literally the device’s inode, no cap 🌸.
• file — file handle to device. the file handle for the device, periodt 💅.

🦋 DESCRIPTION 🦋

So the watchdog device has been opened — iconic — and the page says the watchdog device is single open. On opening, we load the counters, fr fr.

Here’s the counter lore: Counter zero is a 100Hz cascade into counter 1, which downcounts to reboot. When the counter triggers, counter 2 downcounts the length of the reset pulse — and the original text says this reset pulse is “set set to be as long as possible.” Typo is theirs, not mine, bestie 😭💀.

🌈 SEE ALSO 🌈

The page points at the Kernel file ./drivers/watchdog/wdt.c, and then it name-drops all these besties 👑:

• wdt_start(9)
• wdt_stop(9)
• wdt_ping(9)
• wdt_set_heartbeat(9)
• wdt_get_status(9)
• wdt_get_temperature(9)
• wdt_interrupt(9)
• wdt_write(9)
• wdt_ioctl(9)
• wdt_release(9)
• wdt_temp_read(9)
• wdt_temp_open(9)
• wdt_temp_release(9)
• wdt_notify_sys(9)
• wdt_exit(9)
• wdt_init(9)

mwah 💋 — source/version ./drivers/watchdog, date October 2026, page wdt_open(9). slay and read safely 🫶✨