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.\" Copyright (c) 2002 Marcel Moolenaar
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd May 26, 2002
.Dt UUIDGEN 2
.Os
.Sh NAME
.Nm uuidgen
.Nd generate universally unique identifiers
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/uuid.h
.Ft int
.Fn uuidgen "uuid_t *store" "int count"
.Sh DESCRIPTION
The
.Nm
system call generates
.Fa count
universally unique identifiers (UUIDs) and writes them to the buffer
pointed to by
.Fa store .
The identifiers are generated according to the syntax and semantics of the
DCE version 1 variant of universally unique identifiers.
When no IEEE 802
address is available for the node field a random multicast address is
generated for each call.
.Pp
When multiple identifiers are requested, the
.Nm
system call will generate identifiers that are adjacent in time.
.Pp
Universally unique identifiers, also known as globally unique identifiers,
are normally represented as:
.Pp
.Dl 63d81915-7140-11d6-903d-00022d09712b
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
The
.Nm
system call can fail with:
.Bl -tag -width Er
.It Bq Er EFAULT
The buffer pointed to by
.Fa store
could not be written to for any or all identifiers.
.It Bq Er EINVAL
The
.Fa count
parameter is less than 1 or larger than the hard upper limit of 2048.
.El
.Sh SEE ALSO
.Xr uuidgen 1
.Sh HISTORY
The
.Nm
system call first appeared in
.Fx 5.0 .
|
