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