uuidd(8) - phpMan

UUIDD(8) System Administration UUIDD(8)

NAME
uuidd - UUID generation daemon

SYNOPSIS
uuidd [options]

DESCRIPTION
The uuidd daemon is used by the UUID library to generate universally unique identifiers
(UUIDs), especially time-based UUIDs, in a secure and guaranteed-unique fashion, even in
the face of large numbers of threads running on different CPUs trying to grab UUIDs.

OPTIONS
-d, --debug
Run uuidd in debugging mode. This prevents uuidd from running as a daemon.

-F, --no-fork
Do not daemonize using a double-fork.

-k, --kill
If currently a uuidd daemon is running, kill it.

-n, --uuids number
When issuing a test request to a running uuidd, request a bulk response of number
UUIDs.

-P, --no-pid
Do not create a pid file.

-p, --pid path
Specify the pathname where the pid file should be written. By default, the pid file is
written to {runstatedir}/uuidd/uuidd.pid.

-q, --quiet
Suppress some failure messages.

-r, --random
Test uuidd by trying to connect to a running uuidd daemon and request it to return a
random-based UUID.

-S, --socket-activation
Do not create a socket but instead expect it to be provided by the calling process.
This implies --no-fork and --no-pid. This option is intended to be used only with
systemd(1). It needs to be enabled with a configure option.

-s, --socket path
Make uuidd use this pathname for the unix-domain socket. By default, the pathname used
is {runstatedir}/uuidd/request. This option is primarily for debugging purposes, since
the pathname is hard-coded in the libuuid library.

-T, --timeout number
Make uuidd exit after number seconds of inactivity.

-t, --time
Test uuidd by trying to connect to a running uuidd daemon and request it to return a
time-based UUID.

-V, --version
Output version information and exit.

-h, --help
Display help screen and exit.

EXAMPLE
Start up a daemon, print 42 random keys, and then stop the daemon:

uuidd -p /tmp/uuidd.pid -s /tmp/uuidd.socket
uuidd -d -r -n 42 -s /tmp/uuidd.socket
uuidd -d -k -s /tmp/uuidd.socket

AUTHOR
The uuidd daemon was written by Theodore Ts'o <tytso AT mit.edu>.