.\" $NetBSD: uuid.3,v 1.5 2006/11/25 16:48:31 christos Exp $ .\" .\" Copyright (c) 2004 The NetBSD Foundation, Inc. .\" All rights reserved. .\" .\" This code is derived from software contributed to The NetBSD Foundation .\" by Jason R. Thorpe. .\" .\" 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. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the NetBSD .\" Foundation, Inc. and its contributors. .\" 4. 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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: src/lib/libc/uuid/uuid.3,v 1.4 2003/08/08 19:12:28 marcel Exp $ .\" .Dd September 12, 2004 .Dt UUID 3 .Os .Sh NAME .Nm uuid_compare , uuid_create , uuid_create_nil , uuid_equal , .Nm uuid_from_string , uuid_hash , uuid_is_nil , uuid_to_string , .Nm uuid_enc_le , uuid_dec_le , uuid_enc_be , uuid_dec_be .Nd Universally Unique Identifier routines .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In uuid.h .Ft int32_t .Fn uuid_compare "uuid_t *uuid1" "uuid_t *uuid2" "uint32_t *status" .Ft void .Fn uuid_create "uuid_t *uuid" "uint32_t *status" .Ft void .Fn uuid_create_nil "uuid_t *uuid" "uint32_t *status" .Ft int32_t .Fn uuid_equal "uuid_t *uuid1" "uuid_t *uuid2" "uint32_t *status" .Ft void .Fn uuid_from_string "const char *str" "uuid_t *uuid" "uint32_t *status" .Ft uint16_t .Fn uuid_hash "uuid_t *uuid" "uint32_t *status" .Ft int32_t .Fn uuid_is_nil "uuid_t *uuid" "uint32_t *status" .Ft void .Fn uuid_to_string "uuid_t *uuid" "char **str" "uint32_t *status" .Ft void .Fn uuid_enc_le "void *buf" "const uuid_t *uuid" .Ft void .Fn uuid_dec_le "const void *buf" "uuid_t *" .Ft void .Fn uuid_enc_be "void *buf" "const uuid_t *uuid" .Ft void .Fn uuid_dec_be "const void *buf" "uuid_t *" .Sh DESCRIPTION These routines provide for the creation and manipulation of Universally Unique Identifiers .Pq UUIDs , also referred to as Globally Unique Identifiers .Pq GUIDs . .Pp The .Fn uuid_compare function compares two UUIDs. It returns \-1 if .Fa uuid1 precedes .Fa uuid2 , 0 if they are equal, or 1 if .Fa uuid1 follows .Fa uuid2 . .Pp The .Fn uuid_create function creates a new UUID. Storage for the new UUID must be pre-allocated by the caller. .Pp The .Fn uuid_create_nil function creates a nil-valued UUID. Storage for the new UUID must be pre-allocated by the caller. .Pp The .Fn uuid_equal function compares two UUIDs to determine if they are equal. It returns 1 if they are equal, and 0 if they are not equal. .Pp The .Fn uuid_from_string function parses a 36-character string representation of a UUID and converts it to binary representation. Storage for the UUID must be pre-allocated by the caller. .Pp The .Fn uuid_hash function generates a hash value for the specified UUID. Note that the hash value is not a cryptographic hash, and should not be assumed to be unique given two different UUIDs. .Pp The .Fn uuid_is_nil function returns 1 if the UUID is nil-valued and 0 if it is not. .Pp The .Fn uuid_to_string function converts a UUID from binary representation to string representation. Storage for the string is dynamically allocated and returned via the .Fa str argument. This pointer should be passed to .Xr free 3 to release the allocated storage when it is no longer needed. .Pp The .Fn uuid_enc_le and .Fn uuid_enc_be functions encode a binary representation of a UUID into an octet stream in little-endian and big-endian byte-order, respectively. The destination buffer must be pre-allocated by the caller, and must be large enough to hold the 16-octet binary UUID. .Pp The .Fn uuid_dec_le and .Fn uuid_dec_be functions decode a UUID from an octet stream in little-endian and big-endian byte-order, respectively. .Sh RETURN VALUES The .Fn uuid_compare , .Fn uuid_create , .Fn uuid_create_nil , .Fn uuid_equal , .Fn uuid_from_string , .Fn uuid_hash , .Fn uuid_is_nil , and .Fn uuid_to_string functions return successful or unsuccessful completion status in the .Fa status argument. Possible values are: .Pp .Bl -tag -width ".Dv uuid_s_invalid_string_uuid" .It Dv uuid_s_ok The function completed successfully. .It Dv uuid_s_bad_version The UUID does not have a known version. .It Dv uuid_s_invalid_string_uuid The string representation of a UUID is not valid. .It Dv uuid_s_no_memory Memory could not be allocated for the operation. .El .Sh SEE ALSO .Xr uuidgen 1 , .Xr uuidgen 2 .Sh STANDARDS The .Fn uuid_compare , .Fn uuid_create , .Fn uuid_create_nil , .Fn uuid_equal , .Fn uuid_from_string , .Fn uuid_hash , .Fn uuid_is_nil , and .Fn uuid_to_string functions are compatible with the DCE 1.1 RPC specification. .Sh HISTORY The UUID functions first appeared in .Nx 3.0 .