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-.\" ========================================================================
-.\"
-.IX Title ".::uuid 3"
-.TH .::uuid 3 "OSSP uuid 1.6.2" "04-Jul-2008" "Universally Unique Identifier"
-.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
-.\" way too many mistakes in technical documents.
-.if n .ad l
-.nh
-.SH "NAME"
-\&\fB\s-1OSSP\s0 uuid\fR \- \fBUniversally Unique Identifier\fR
-.SH "VERSION"
-.IX Header "VERSION"
-\&\s-1OSSP\s0 uuid \s-11.6.2 (04-Jul-2008)\s0
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-\&\fB\s-1OSSP\s0 uuid\fR is a \s-1ISO\-C:1999\s0 application programming interface (\s-1API\s0) and
-corresponding command line interface (\s-1CLI\s0) for the generation of \s-1DCE\s0
-1.1, \s-1ISO/IEC\s0 11578:1996 and \s-1IETF\s0 \s-1RFC\-4122\s0 compliant \fIUniversally Unique
-Identifier\fR (\s-1UUID\s0). It supports \s-1DCE\s0 1.1 variant UUIDs of version 1 (time
-and node based), version 3 (name based, \s-1MD5\s0), version 4 (random number
-based) and version 5 (name based, \s-1SHA\-1\s0). Additional \s-1API\s0 bindings are
-provided for the languages \s-1ISO\-\*(C+:1998\s0, Perl:5 and \s-1PHP:4/5\s0. Optional
-backward compatibility exists for the ISO-C \s-1DCE\-1\s0.1 and Perl Data::UUID
-APIs.
-.PP
-UUIDs are 128 bit numbers which are intended to have a high likelihood
-of uniqueness over space and time and are computationally difficult
-to guess. They are globally unique identifiers which can be locally
-generated without contacting a global registration authority. UUIDs
-are intended as unique identifiers for both mass tagging objects
-with an extremely short lifetime and to reliably identifying very
-persistent objects across a network.
-.PP
-This is the ISO-C application programming interface (\s-1API\s0) of \fB\s-1OSSP\s0 uuid\fR.
-.Sh "\s-1UUID\s0 Binary Representation"
-.IX Subsection "UUID Binary Representation"
-According to the \s-1DCE\s0 1.1, \s-1ISO/IEC\s0 11578:1996 and \s-1IETF\s0 \s-1RFC\-4122\s0
-standards, a \s-1DCE\s0 1.1 variant \s-1UUID\s0 is a 128 bit number defined out of 7
-fields, each field a multiple of an octet in size and stored in network
-byte order:
-.PP
-.Vb 11
-\&                                                    [4]
-\&                                                   version
-\&                                                 \-\->|  |<\-\-
-\&                                                    |  |
-\&                                                    |  |  [16]
-\&                [32]                      [16]      |  |time_hi
-\&              time_low                  time_mid    | _and_version
-\&    |<\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\->||<\-\-\-\-\-\-\-\-\-\-\-\->||<\-\-\-\-\-\-\-\-\-\-\-\->|
-\&    | MSB                          ||              ||  |           |
-\&    | /                            ||              ||  |           |
-\&    |/                             ||              ||  |           |
-\&
-\&    +\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-+~~
-\&    |  15  ||  14  ||  13  ||  12  ||  11  ||  10  |####9  ||   8  |
-\&    | MSO  ||      ||      ||      ||      ||      |####   ||      |
-\&    +\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-+~~
-\&    7654321076543210765432107654321076543210765432107654321076543210
-\&
-\&  ~~+\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-+
-\&    ##* 7  ||   6  ||   5  ||   4  ||   3  ||   2  ||   1  ||   0  |
-\&    ##*    ||      ||      ||      ||      ||      ||      ||  LSO |
-\&  ~~+\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-++\-\-\-\-\-\-+
-\&    7654321076543210765432107654321076543210765432107654321076543210
-\&
-\&    | |    ||      ||                                             /|
-\&    | |    ||      ||                                            / |
-\&    | |    ||      ||                                          LSB |
-\&    |<\-\-\-\->||<\-\-\-\->||<\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\->|
-\&    |clk_seq clk_seq                      node
-\&    |_hi_res _low                         [48]
-\&    |[5\-6]    [8]
-\&    | |
-\& \-\->| |<\-\-
-\&  variant
-\&   [2\-3]
-.Ve
-.PP
-An example of a \s-1UUID\s0 binary representation is the octet stream \f(CW\*(C`0xF8
-0x1D 0x4F 0xAE 0x7D 0xEC 0x11 0xD0 0xA7 0x65 0x00 0xA0 0xC9 0x1E 0x6B
-0xF6\*(C'\fR. The binary representation format is exactly what the \fB\s-1OSSP\s0 uuid\fR
-\&\s-1API\s0 functions \fBuuid_import\fR() and \fBuuid_export\fR() deal with under
-\&\f(CW\*(C`UUID_FMT_BIN\*(C'\fR.
-.Sh "\s-1UUID\s0 \s-1ASCII\s0 String Representation"
-.IX Subsection "UUID ASCII String Representation"
-According to the \s-1DCE\s0 1.1, \s-1ISO/IEC\s0 11578:1996 and \s-1IETF\s0 \s-1RFC\-4122\s0
-standards, a \s-1DCE\s0 1.1 variant \s-1UUID\s0 is represented as an \s-1ASCII\s0 string
-consisting of 8 hexadecimal digits followed by a hyphen, then three
-groups of 4 hexadecimal digits each followed by a hyphen, then 12
-hexadecimal digits. Formally, the string representation is defined by
-the following grammar:
-.PP
-.Vb 10
-\& uuid                        = <time_low> "\-"
-\&                               <time_mid> "\-"
-\&                               <time_high_and_version> "\-"
-\&                               <clock_seq_high_and_reserved>
-\&                               <clock_seq_low> "\-"
-\&                               <node>
-\& time_low                    = 4*<hex_octet>
-\& time_mid                    = 2*<hex_octet>
-\& time_high_and_version       = 2*<hex_octet>
-\& clock_seq_high_and_reserved = <hex_octet>
-\& clock_seq_low               = <hex_octet>
-\& node                        = 6*<hex_octet>
-\& hex_octet                   = <hex_digit> <hex_digit>
-\& hex_digit                   = "0"|"1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"
-\&                              |"a"|"b"|"c"|"d"|"e"|"f"
-\&                              |"A"|"B"|"C"|"D"|"E"|"F"
-.Ve
-.PP
-An example of a \s-1UUID\s0 string representation is the \s-1ASCII\s0 string
-"\f(CW\*(C`f81d4fae\-7dec\-11d0\-a765\-00a0c91e6bf6\*(C'\fR". The string representation
-format is exactly what the \fB\s-1OSSP\s0 uuid\fR \s-1API\s0 functions \fBuuid_import\fR()
-and \fBuuid_export\fR() deal with under \f(CW\*(C`UUID_FMT_STR\*(C'\fR.
-.PP
-Notice: a corresponding \s-1URL\s0 can be generated out of a \s-1ASCII\s0 string
-representation of an \s-1UUID\s0 by prefixing with "\f(CW\*(C`urn:uuid:\*(C'\fR\*(L" as in
-\&\*(R"\f(CW\*(C`urn:uuid:f81d4fae\-7dec\-11d0\-a765\-00a0c91e6bf6\*(C'\fR".
-.Sh "\s-1UUID\s0 Single Integer Value Representation"
-.IX Subsection "UUID Single Integer Value Representation"
-According to the \s-1ISO/IEC\s0 11578:1996 and ITU-T Rec. X.667 standards, a
-\&\s-1DCE\s0 1.1 variant \s-1UUID\s0 can be also represented as a single integer value
-consisting of a decimal number with up to 39 digits.
-.PP
-An example of a \s-1UUID\s0 single integer value representation is the decimal
-number "\f(CW329800735698586629295641978511506172918\fR". The string
-representation format is exactly what the \fB\s-1OSSP\s0 uuid\fR \s-1API\s0 functions
-\&\fBuuid_import\fR() and \fBuuid_export\fR() deal with under \f(CW\*(C`UUID_FMT_SIV\*(C'\fR.
-.PP
-Notice: a corresponding \s-1ISO\s0 \s-1OID\s0 can be generated under the
-\&\*(L"{\fIjoint\-iso\-itu\-t\fR\|(2) uuid(25)}\*(R" arc out of a single integer value
-representation of a \s-1UUID\s0 by prefixing with "\f(CW2.25.\fR\*(L". An example \s-1OID\s0
-is \*(R"\f(CW2.25.329800735698586629295641978511506172918\fR\*(L". Additionally,
-an \s-1URL\s0 can be generated by further prefixing with \*(R"\f(CW\*(C`urn:oid:\*(C'\fR\*(L" as in
-\&\*(R"\f(CW\*(C`urn:oid:2.25.329800735698586629295641978511506172918\*(C'\fR".
-.Sh "\s-1UUID\s0 Variants and Versions"
-.IX Subsection "UUID Variants and Versions"
-A \s-1UUID\s0 has a variant and version. The variant defines the layout of the
-\&\s-1UUID\s0. The version defines the content of the \s-1UUID\s0. The \s-1UUID\s0 variant
-supported in \fB\s-1OSSP\s0 uuid\fR is the \s-1DCE\s0 1.1 variant only. The \s-1DCE\s0 1.1 \s-1UUID\s0
-variant versions supported in \fB\s-1OSSP\s0 uuid\fR are:
-.IP "\fBVersion 1\fR (time and node based)" 4
-.IX Item "Version 1 (time and node based)"
-These are the classical UUIDs, created out of a 60\-bit system time,
-a 14\-bit local clock sequence and 48\-bit system \s-1MAC\s0 address. The \s-1MAC\s0
-address can be either the real one of a physical network interface card
-(\s-1NIC\s0) or a random multi-cast \s-1MAC\s0 address. Version 1 UUIDs are usually
-used as one-time global unique identifiers.
-.IP "\fBVersion 3\fR (name based, \s-1MD5\s0)" 4
-.IX Item "Version 3 (name based, MD5)"
-These are UUIDs which are based on the 128\-bit \s-1MD5\s0 message digest of the
-concatenation of a 128\-bit namespace \s-1UUID\s0 and a name string of arbitrary
-length. Version 3 UUIDs are usually used for non-unique but repeatable
-message digest identifiers.
-.IP "\fBVersion 4\fR (random data based)" 4
-.IX Item "Version 4 (random data based)"
-These are UUIDs which are based on just 128\-bit of random data. Version
-4 UUIDs are usually used as one-time local unique identifiers.
-.IP "\fBVersion 5\fR (name based, \s-1SHA\-1\s0)" 4
-.IX Item "Version 5 (name based, SHA-1)"
-These are UUIDs which are based on the 160\-bit \s-1SHA\-1\s0 message digest of the
-concatenation of a 128\-bit namespace \s-1UUID\s0 and a name string of arbitrary
-length. Version 5 UUIDs are usually used for non-unique but repeatable
-message digest identifiers.
-.Sh "\s-1UUID\s0 Uniqueness"
-.IX Subsection "UUID Uniqueness"
-Version 1 UUIDs are guaranteed to be unique through combinations of
-hardware addresses, time stamps and random seeds. There is a reference
-in the \s-1UUID\s0 to the hardware (\s-1MAC\s0) address of the first network interface
-card (\s-1NIC\s0) on the host which generated the \s-1UUID\s0 \*(-- this reference
-is intended to ensure the \s-1UUID\s0 will be unique in space as the \s-1MAC\s0
-address of every network card is assigned by a single global authority
-(\s-1IEEE\s0) and is guaranteed to be unique. The next component in a \s-1UUID\s0
-is a timestamp which, as clock always (should) move forward, will
-be unique in time. Just in case some part of the above goes wrong
-(the hardware address cannot be determined or the clock moved steps
-backward), there is a random clock sequence component placed into the
-\&\s-1UUID\s0 as a \*(L"catch-all\*(R" for uniqueness.
-.PP
-Version 3 and version 5 UUIDs are guaranteed to be inherently globally
-unique if the combination of namespace and name used to generate them is
-unique.
-.PP
-Version 4 UUIDs are not guaranteed to be globally unique, because they
-are generated out of locally gathered pseudo-random numbers only.
-Nevertheless there is still a high likelihood of uniqueness over space
-and time and that they are computationally difficult to guess.
-.Sh "Nil \s-1UUID\s0"
-.IX Subsection "Nil UUID"
-There is a special \fINil\fR \s-1UUID\s0 consisting of all octets set to zero in
-the binary representation. It can be used as a special \s-1UUID\s0 value which does
-not conflict with real UUIDs.
-.SH "APPLICATION PROGRAMMING INTERFACE"
-.IX Header "APPLICATION PROGRAMMING INTERFACE"
-The ISO-C Application Programming Interface (\s-1API\s0) of \fB\s-1OSSP\s0 uuid\fR
-consists of the following components.
-.Sh "\s-1CONSTANTS\s0"
-.IX Subsection "CONSTANTS"
-The following constants are provided:
-.IP "\fB\s-1UUID_VERSION\s0\fR" 4
-.IX Item "UUID_VERSION"
-The hexadecimal encoded \fB\s-1OSSP\s0 uuid\fR version. This allows compile-time
-checking of the \fB\s-1OSSP\s0 uuid\fR version. For run-time checking use
-\&\fBuuid_version\fR() instead.
-.Sp
-The hexadecimal encoding for a version "$\fIv\fR.$\fIr\fR$\fIt\fR$\fIl\fR" is
-calculated with the \fB\s-1GNU\s0 shtool\fR \fBversion\fR command and is (in
-Perl-style for concise description) "sprintf('0x%x%02x%d%02x', $\fIv\fR,
-$\fIr\fR, {qw(s 9 . 2 b 1 a 0)}\->{$\fIt\fR}, ($\fIt\fR eq 's' ? 99 : $\fIl\fR))\*(L",
-i.e., the version 0.9.6 is encoded as \*(R"0x009206".
-.IP "\fB\s-1UUID_LEN_BIN\s0\fR, \fB\s-1UUID_LEN_STR\s0\fR, \fB\s-1UUID_LEN_SIV\s0\fR" 4
-.IX Item "UUID_LEN_BIN, UUID_LEN_STR, UUID_LEN_SIV"
-The number of octets of the \s-1UUID\s0 binary and string representations.
-Notice that the lengths of the string representation (\fB\s-1UUID_LEN_STR\s0\fR)
-and the lengths of the single integer value representation
-(\fB\s-1UUID_LEN_SIV\s0\fR) does \fInot\fR include the necessary \f(CW\*(C`NUL\*(C'\fR termination
-character.
-.IP "\fB\s-1UUID_MAKE_V1\s0\fR, \fB\s-1UUID_MAKE_V3\s0\fR, \fB\s-1UUID_MAKE_V4\s0\fR, \fB\s-1UUID_MAKE_V5\s0\fR, \fB\s-1UUID_MAKE_MC\s0\fR" 4
-.IX Item "UUID_MAKE_V1, UUID_MAKE_V3, UUID_MAKE_V4, UUID_MAKE_V5, UUID_MAKE_MC"
-The \fImode\fR bits for use with \fBuuid_make\fR(). The \fB\s-1UUID_MAKE_V\s0\fR\fIN\fR
-specify which \s-1UUID\s0 version to generate. The \fB\s-1UUID_MAKE_MC\s0\fR forces the
-use of a random multi-cast \s-1MAC\s0 address instead of the real physical \s-1MAC\s0
-address in version 1 UUIDs.
-.IP "\fB\s-1UUID_RC_OK\s0\fR, \fB\s-1UUID_RC_ARG\s0\fR, \fB\s-1UUID_RC_MEM\s0\fR, \fB\s-1UUID_RC_SYS\s0\fR, \fB\s-1UUID_RC_INT\s0\fR, \fB\s-1UUID_RC_IMP\s0\fR" 4
-.IX Item "UUID_RC_OK, UUID_RC_ARG, UUID_RC_MEM, UUID_RC_SYS, UUID_RC_INT, UUID_RC_IMP"
-The possible numerical return-codes of \s-1API\s0 functions.
-The \f(CW\*(C`UUID_RC_OK\*(C'\fR indicates success, the others indicate errors.
-Use \fBuuid_error\fR() to translate them into string versions.
-.IP "\fB\s-1UUID_FMT_BIN\s0\fR, \fB\s-1UUID_FMT_STR\s0\fR, \fB\s-1UUID_FMT_SIV\s0\fR, \fB\s-1UUID_FMT_TXT\s0\fR" 4
-.IX Item "UUID_FMT_BIN, UUID_FMT_STR, UUID_FMT_SIV, UUID_FMT_TXT"
-The \fIfmt\fR formats for use with \fBuuid_import\fR() and \fBuuid_export\fR().
-The \fB\s-1UUID_FMT_BIN\s0\fR indicates the \s-1UUID\s0 binary representation (of
-length \fB\s-1UUID_LEN_BIN\s0\fR), the \fB\s-1UUID_FMT_STR\s0\fR indicates the \s-1UUID\s0 string
-representation (of length \fB\s-1UUID_LEN_STR\s0\fR), the \fB\s-1UUID_FMT_SIV\s0\fR
-indicates the \s-1UUID\s0 single integer value representation (of maximum
-length \fB\s-1UUID_LEN_SIV\s0\fR) and the \fB\s-1UUID_FMT_TXT\s0\fR indicates the textual
-description (of arbitrary length) of a \s-1UUID\s0.
-.Sh "\s-1FUNCTIONS\s0"
-.IX Subsection "FUNCTIONS"
-The following functions are provided:
-.IP "uuid_rc_t \fBuuid_create\fR(uuid_t **\fIuuid\fR);" 4
-.IX Item "uuid_rc_t uuid_create(uuid_t **uuid);"
-Create a new \s-1UUID\s0 object and store a pointer to it in \f(CW\*(C`*\*(C'\fR\fIuuid\fR.
-A \s-1UUID\s0 object consists of an internal representation of a \s-1UUID\s0, the
-internal \s-1PRNG\s0 and \s-1MD5\s0 generator contexts, and cached \s-1MAC\s0 address and
-timestamp information. The initial \s-1UUID\s0 is the \fINil\fR \s-1UUID\s0.
-.IP "uuid_rc_t \fBuuid_destroy\fR(uuid_t *\fIuuid\fR);" 4
-.IX Item "uuid_rc_t uuid_destroy(uuid_t *uuid);"
-Destroy \s-1UUID\s0 object \fIuuid\fR.
-.IP "uuid_rc_t \fBuuid_clone\fR(const uuid_t *\fIuuid\fR, uuid_t **\fIuuid_clone\fR);" 4
-.IX Item "uuid_rc_t uuid_clone(const uuid_t *uuid, uuid_t **uuid_clone);"
-Clone \s-1UUID\s0 object \fIuuid\fR and store new \s-1UUID\s0 object in \fIuuid_clone\fR.
-.IP "uuid_rc_t \fBuuid_isnil\fR(const uuid_t *\fIuuid\fR, int *\fIresult\fR);" 4
-.IX Item "uuid_rc_t uuid_isnil(const uuid_t *uuid, int *result);"
-Checks whether the \s-1UUID\s0 in \fIuuid\fR is the \fINil\fR \s-1UUID\s0.
-If this is the case, it returns \fItrue\fR in \f(CW\*(C`*\*(C'\fR\fIresult\fR.
-Else it returns \fIfalse\fR in \f(CW\*(C`*\*(C'\fR\fIresult\fR.
-.IP "uuid_rc_t \fBuuid_compare\fR(const uuid_t *\fIuuid\fR, const uuid_t *\fIuuid2\fR, int *\fIresult\fR);" 4
-.IX Item "uuid_rc_t uuid_compare(const uuid_t *uuid, const uuid_t *uuid2, int *result);"
-Compares the order of the two UUIDs in \fIuuid1\fR and \fIuuid2\fR
-and returns the result in \f(CW\*(C`*\*(C'\fR\fIresult\fR: \f(CW\*(C`\-1\*(C'\fR if \fIuuid1\fR is
-smaller than \fIuuid2\fR, \f(CW0\fR if \fIuuid1\fR is equal to \fIuuid2\fR
-and \f(CW+1\fR if \fIuuid1\fR is greater than \fIuuid2\fR.
-.IP "uuid_rc_t \fBuuid_import\fR(uuid_t *\fIuuid\fR, uuid_fmt_t \fIfmt\fR, const void *\fIdata_ptr\fR, size_t \fIdata_len\fR);" 4
-.IX Item "uuid_rc_t uuid_import(uuid_t *uuid, uuid_fmt_t fmt, const void *data_ptr, size_t data_len);"
-Imports a \s-1UUID\s0 \fIuuid\fR from an external representation of format \fIfmt\fR.
-The data is read from the buffer at \fIdata_ptr\fR which contains at least
-\&\fIdata_len\fR bytes.
-.Sp
-The format of the external representation is specified by \fIfmt\fR and the
-minimum expected length in \fIdata_len\fR depends on it. Valid values for
-\&\fIfmt\fR are \fB\s-1UUID_FMT_BIN\s0\fR, \fB\s-1UUID_FMT_STR\s0\fR and \fB\s-1UUID_FMT_SIV\s0\fR.
-.IP "uuid_rc_t \fBuuid_export\fR(const uuid_t *\fIuuid\fR, uuid_fmt_t \fIfmt\fR, void *\fIdata_ptr\fR, size_t *\fIdata_len\fR);" 4
-.IX Item "uuid_rc_t uuid_export(const uuid_t *uuid, uuid_fmt_t fmt, void *data_ptr, size_t *data_len);"
-Exports a \s-1UUID\s0 \fIuuid\fR into an external representation of format
-\&\fIfmt\fR. Valid values for \fIfmt\fR are \fB\s-1UUID_FMT_BIN\s0\fR, \fB\s-1UUID_FMT_STR\s0\fR,
-\&\fB\s-1UUID_FMT_SIV\s0\fR and \fB\s-1UUID_FMT_TXT\s0\fR.
-.Sp
-The data is written to the buffer whose location is obtained
-by dereferencing \fIdata_ptr\fR after a \*(L"cast\*(R" to the appropriate
-pointer-to-pointer type. Hence the generic pointer argument \fIdata_ptr\fR
-is expected to be a pointer to a \*(L"pointer of a particular type\*(R", i.e.,
-it has to be of type "\f(CW\*(C`unsigned char **\*(C'\fR" for \fB\s-1UUID_FMT_BIN\s0\fR and
-"\f(CW\*(C`char **\*(C'\fR" for \fB\s-1UUID_FMT_STR\s0\fR, \fB\s-1UUID_FMT_SIV\s0\fR and \fB\s-1UUID_FMT_TXT\s0\fR.
-.Sp
-The buffer has to be room for at least \f(CW\*(C`*\*(C'\fR\fIdata_len\fR bytes. If the
-value of the pointer after \*(L"casting\*(R" and dereferencing \fIdata_ptr\fR
-is \f(CW\*(C`NULL\*(C'\fR, \fIdata_len\fR is ignored as input and a new buffer is
-allocated and returned in the pointer after \*(L"casting\*(R" and dereferencing
-\&\fIdata_ptr\fR (the caller has to \fIfree\fR\|(3) it later on).
-.Sp
-If \fIdata_len\fR is not \f(CW\*(C`NULL\*(C'\fR, the number of available bytes in the
-buffer has to be provided in \f(CW\*(C`*\*(C'\fR\fIdata_len\fR and the number of actually
-written bytes are returned in \f(CW\*(C`*\*(C'\fR\fIdata_len\fR again. The minimum
-required buffer length depends on the external representation as
-specified by \fIfmt\fR and is at least \fB\s-1UUID_LEN_BIN\s0\fR for \fB\s-1UUID_FMT_BIN\s0\fR,
-\&\fB\s-1UUID_LEN_STR\s0\fR for \fB\s-1UUID_FMT_STR\s0\fR and \fB\s-1UUID_LEN_SIV\s0\fR for
-\&\fB\s-1UUID_FMT_SIV\s0\fR. For \fB\s-1UUID_FMT_TXT\s0\fR a buffer of unspecified length is
-required and hence it is recommended to allow \fB\s-1OSSP\s0 uuid\fR to allocate
-the buffer as necessary.
-.IP "uuid_rc_t \fBuuid_load\fR(uuid_t *\fIuuid\fR, const char *\fIname\fR);" 4
-.IX Item "uuid_rc_t uuid_load(uuid_t *uuid, const char *name);"
-Loads a pre-defined \s-1UUID\s0 value into the \s-1UUID\s0 object \fIuuid\fR. The
-following \fIname\fR arguments are currently known:
-.RS 4
-.IP "\fIname\fR      \fI\s-1UUID\s0\fR" 4
-.IX Item "name      UUID"
-.PD 0
-.IP "nil       00000000\-0000\-0000\-0000\-000000000000" 4
-.IX Item "nil       00000000-0000-0000-0000-000000000000"
-.IP "ns:DNS    6ba7b810\-9dad\-11d1\-80b4\-00c04fd430c8" 4
-.IX Item "ns:DNS    6ba7b810-9dad-11d1-80b4-00c04fd430c8"
-.IP "ns:URL    6ba7b811\-9dad\-11d1\-80b4\-00c04fd430c8" 4
-.IX Item "ns:URL    6ba7b811-9dad-11d1-80b4-00c04fd430c8"
-.IP "ns:OID    6ba7b812\-9dad\-11d1\-80b4\-00c04fd430c8" 4
-.IX Item "ns:OID    6ba7b812-9dad-11d1-80b4-00c04fd430c8"
-.IP "ns:X500   6ba7b814\-9dad\-11d1\-80b4\-00c04fd430c8" 4
-.IX Item "ns:X500   6ba7b814-9dad-11d1-80b4-00c04fd430c8"
-.RE
-.RS 4
-.PD
-.Sp
-The "\f(CW\*(C`ns:\*(C'\fR\fI\s-1XXX\s0\fR" are names of pre-defined name-space UUIDs for use in
-the generation of \s-1DCE\s0 1.1 version 3 and version 5 UUIDs.
-.RE
-.IP "uuid_rc_t \fBuuid_make\fR(uuid_t *\fIuuid\fR, unsigned int \fImode\fR, ...);" 4
-.IX Item "uuid_rc_t uuid_make(uuid_t *uuid, unsigned int mode, ...);"
-Generates a new \s-1UUID\s0 in \fIuuid\fR according to \fImode\fR and optional
-arguments (dependent on \fImode\fR).
-.Sp
-If \fImode\fR contains the \f(CW\*(C`UUID_MAKE_V1\*(C'\fR bit, a \s-1DCE\s0 1.1 variant \s-1UUID\s0 of
-version 1 is generated. Then optionally the bit \f(CW\*(C`UUID_MAKE_MC\*(C'\fR forces
-the use of random multi-cast \s-1MAC\s0 address instead of the real physical
-\&\s-1MAC\s0 address (the default). The \s-1UUID\s0 is generated out of the 60\-bit current
-system time, a 12\-bit clock sequence and the 48\-bit \s-1MAC\s0 address.
-.Sp
-If \fImode\fR contains the \f(CW\*(C`UUID_MAKE_V3\*(C'\fR or \f(CW\*(C`UUID_MAKE_V5\*(C'\fR bit, a \s-1DCE\s0
-1.1 variant \s-1UUID\s0 of version 3 or 5 is generated and two additional
-arguments are expected: first, a namespace \s-1UUID\s0 object (\f(CW\*(C`uuid_t *\*(C'\fR).
-Second, a name string of arbitrary length (\f(CW\*(C`const char *\*(C'\fR). The \s-1UUID\s0 is
-generated out of the 128\-bit \s-1MD5\s0 or 160\-bit \s-1SHA\-1\s0 from the concatenated
-octet stream of namespace \s-1UUID\s0 and name string.
-.Sp
-If \fImode\fR contains the \f(CW\*(C`UUID_MAKE_V4\*(C'\fR bit, a \s-1DCE\s0 1.1 variant \s-1UUID\s0
-of version 4 is generated. The \s-1UUID\s0 is generated out of 128\-bit random
-data.
-.IP "char *\fBuuid_error\fR(uuid_rc_t \fIrc\fR);" 4
-.IX Item "char *uuid_error(uuid_rc_t rc);"
-Returns a constant string representation corresponding to the
-return-code \fIrc\fR for use in displaying \fB\s-1OSSP\s0 uuid\fR errors.
-.IP "unsigned long \fBuuid_version\fR(void);" 4
-.IX Item "unsigned long uuid_version(void);"
-Returns the hexadecimal encoded \fB\s-1OSSP\s0 uuid\fR version as compiled into
-the library object files. This allows run-time checking of the \fB\s-1OSSP\s0
-uuid\fR version. For compile-time checking use \f(CW\*(C`UUID_VERSION\*(C'\fR instead.
-.SH "EXAMPLE"
-.IX Header "EXAMPLE"
-The following shows an example usage of the \s-1API\s0. Error handling is
-omitted for code simplification and has to be re-added for production
-code.
-.PP
-.Vb 5
-\& /* generate a DCE 1.1 v1 UUID from system environment */
-\& char *uuid_v1(void)
-\& {
-\&     uuid_t *uuid;
-\&     char *str;
-\&
-\&     uuid_create(&uuid);
-\&     uuid_make(uuid, UUID_MAKE_V1);
-\&     str = NULL;
-\&     uuid_export(uuid, UUID_FMT_STR, &str, NULL);
-\&     uuid_destroy(uuid);
-\&     return str;
-\& }
-\&
-\& /* generate a DCE 1.1 v3 UUID from an URL */
-\& char *uuid_v3(const char *url)
-\& {
-\&     uuid_t *uuid;
-\&     uuid_t *uuid_ns;
-\&     char *str;
-\&
-\&     uuid_create(&uuid);
-\&     uuid_create(&uuid_ns);
-\&     uuid_load(uuid_ns, "ns:URL");
-\&     uuid_make(uuid, UUID_MAKE_V3, uuid_ns, url);
-\&     str = NULL;
-\&     uuid_export(uuid, UUID_FMT_STR, &str, NULL);
-\&     uuid_destroy(uuid_ns);
-\&     uuid_destroy(uuid);
-\&     return str;
-\& }
-.Ve
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-The following are references to \fB\s-1UUID\s0\fR documentation and specifications:
-.IP "\(bu" 4
-\&\fBA Universally Unique IDentifier (\s-1UUID\s0) \s-1URN\s0 Namespace\fR,
-P. Leach, M. Mealling, R. Salz,
-\&\s-1IETF\s0 \s-1RFC\-4122\s0,
-July 2005, 32 pages,
-http://www.ietf.org/rfc/rfc4122.txt
-.IP "\(bu" 4
-Information Technology \*(-- Open Systems Interconnection (\s-1OSI\s0),
-\&\fBProcedures for the operation of \s-1OSI\s0 Registration Authorities:
-Generation and Registration of Universally Unique Identifiers (UUIDs)
-and their Use as \s-1ASN\s0.1 Object Identifier Components\fR,
-\&\s-1ISO/IEC\s0 9834\-8:2004 / ITU-T Rec. X.667, 2004,
-December 2004, 25 pages,
-http://www.itu.int/ITU\-T/studygroups/com17/oid/X.667\-E.pdf
-.IP "\(bu" 4
-\&\fB\s-1DCE\s0 1.1: Remote Procedure Call\fR,
-appendix \fBUniversally Unique Identifier\fR,
-Open Group Technical Standard
-Document Number C706, August 1997, 737 pages,
-(supersedes C309 \s-1DCE:\s0 Remote Procedure Call 8/1994,
-which was basis for \s-1ISO/IEC\s0 11578:1996 specification),
-http://www.opengroup.org/publications/catalog/c706.htm
-.IP "\(bu" 4
-Information technology \*(-- Open Systems Interconnection (\s-1OSI\s0),
-\&\fBRemote Procedure Call (\s-1RPC\s0)\fR,
-\&\s-1ISO/IEC\s0 11578:1996,
-August 2001, 570 pages, (\s-1CHF\s0 340,00),
-http://www.iso.ch/cate/d2229.html
-.IP "\(bu" 4
-\&\fB\s-1HTTP\s0 Extensions for Distributed Authoring (WebDAV)\fR,
-section \fB6.4.1 Node Field Generation Without the \s-1IEEE\s0 802 Address\fR,
-\&\s-1IETF\s0 \s-1RFC\-2518\s0,
-February 1999, 94 pages,
-http://www.ietf.org/rfc/rfc2518.txt
-.IP "\(bu" 4
-\&\fB\s-1DCE\s0 1.1 compliant \s-1UUID\s0 functions\fR,
-FreeBSD manual pages \fIuuid\fR\|(3) and \fIuuidgen\fR\|(2),
-http://www.freebsd.org/cgi/man.cgi?query=uuid&manpath=FreeBSD+6.0\-RELEASE
-.SH "HISTORY"
-.IX Header "HISTORY"
-\&\fB\s-1OSSP\s0 uuid\fR was implemented in January 2004 by Ralf S. Engelschall
-<rse@engelschall.com>. It was prompted by the use of UUIDs
-in the \fB\s-1OSSP\s0 as\fR and \fBOpenPKG\fR projects. It is a clean room
-implementation intended to be strictly standards compliant and maximum
-portable.
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-\&\fIuuid\fR\|(1), \fIuuid\-config\fR\|(1), \fIOSSP::uuid\fR\|(3).