SIGUSR1 Signal Explained (Signal 10)
What the Linux SIGUSR1 signal does and when it's used.
Published October 23, 2026
SIGUSR1 (signal number 10) a user-defined signal with no fixed system meaning, available for applications to use for their own purposes.
Key points
- Commonly used by applications to trigger custom behavior, like reloading a log file handle or dumping internal stats