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uuidd — UUID generation daemon
uuidd [options]
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.
−d,
−−debugRun uuidd in debugging mode. This prevents uuidd from running as a daemon.
−h,
−−helpDisplay help screen and exit.
−k,
−−killIf currently a uuidd daemon is running, kill it.
−n,
−−uuids numberWhen issuing a test request to a running uuidd, request a bulk response of number UUIDs.
−p,
−−pid pathSpecify the pathname where the pid file should be written. By default, the pid file is written to /run/uuidd/uuidd.pid.
−P,
−−no−pidDo not create pid file.
−F,
−−no−forkDo not daemonize using double-fork.
−S,
−−socket−activationDo not create the socket and instead expect it to be provided by the calling process. Implies --no-fork and --no-pid. As of this writing, this option is supposed to be used only with systemd. This option must be enabled with a configure option.
−q,
−−quietSuppress some failure messages.
−r,
−−randomTest uuidd by trying to connect to a running uuidd daemon and request it to return a random-based UUID.
−s,
−−socket pathSpecify the pathname used for the unix-domain socket used by uuidd. By default, the pathname used is /run/uuidd/request. This is primarily for debugging purposes, since the pathname is hard-coded in the libuuid library.
−T,
−−timeout timeoutSpecify a timeout for uuidd. If specified, then uuidd will exit after timeout seconds of inactivity.
−t,
−−timeTest uuidd by trying to connect to a running uuidd daemon and request it to return a time-based UUID.
−V,
−−versionOutput version information and exit.
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
The uuidd daemon is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.