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UUID(3)                 NetBSD Library Functions Manual                UUID(3)


NAME

     uuid_compare, uuid_create, uuid_create_nil, uuid_equal, uuid_from_string,
     uuid_hash, uuid_is_nil, uuid_to_string, uuid_enc_le, uuid_dec_le,
     uuid_enc_be, uuid_dec_be -- Universally Unique Identifier routines


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <uuid.h>

     int32_t
     uuid_compare(const uuid_t *uuid1, const uuid_t *uuid2, uint32_t *status);

     void
     uuid_create(uuid_t *uuid, uint32_t *status);

     void
     uuid_create_nil(uuid_t *uuid, uint32_t *status);

     int32_t
     uuid_equal(const uuid_t *uuid1, const uuid_t *uuid2, uint32_t *status);

     void
     uuid_from_string(const char *str, uuid_t *uuid, uint32_t *status);

     uint16_t
     uuid_hash(const uuid_t *uuid, uint32_t *status);

     int32_t
     uuid_is_nil(const uuid_t *uuid, uint32_t *status);

     void
     uuid_to_string(const uuid_t *uuid, char **str, uint32_t *status);

     void
     uuid_enc_le(void *buf, const uuid_t *uuid);

     void
     uuid_dec_le(const void *buf, uuid_t *);

     void
     uuid_enc_be(void *buf, const uuid_t *uuid);

     void
     uuid_dec_be(const void *buf, uuid_t *);


DESCRIPTION

     These routines provide for the creation and manipulation of Universally
     Unique Identifiers (UUIDs), also referred to as Globally Unique Identi-
     fiers (GUIDs).

     The uuid_compare() function compares two UUIDs.  It returns -1 if uuid1
     precedes uuid2, 0 if they are equal, or 1 if uuid1 follows uuid2.

     The uuid_create() function creates a new UUID.  Storage for the new UUID
     must be pre-allocated by the caller.

     The uuid_create_nil() function creates a nil-valued UUID.  Storage for
     the new UUID must be pre-allocated by the caller.

     The 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.

     The uuid_from_string() function parses a 36-character string representa-
     tion of a UUID and converts it to binary representation.  Storage for the
     UUID must be pre-allocated by the caller.

     The 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.

     The uuid_is_nil() function returns 1 if the UUID is nil-valued and 0 if
     it is not.

     The uuid_to_string() function converts a UUID from binary representation
     to string representation.  Storage for the string is dynamically allo-
     cated and returned via the str argument.  This pointer should be passed
     to free(3) to release the allocated storage when it is no longer needed.

     The uuid_enc_le() and uuid_enc_be() functions encode a binary representa-
     tion 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.

     The uuid_dec_le() and uuid_dec_be() functions decode a UUID from an octet
     stream in little-endian and big-endian byte-order, respectively.


RETURN VALUES

     The uuid_compare(), uuid_create(), uuid_create_nil(), uuid_equal(),
     uuid_from_string(), uuid_hash(), uuid_is_nil(), and uuid_to_string()
     functions return successful or unsuccessful completion status in the
     status argument.  Possible values are:

     uuid_s_ok                   The function completed successfully.

     uuid_s_bad_version          The UUID does not have a known version.

     uuid_s_invalid_string_uuid  The string representation of a UUID is not
                                 valid.

     uuid_s_no_memory            Memory could not be allocated for the opera-
                                 tion.


SEE ALSO

     uuidgen(1), uuidgen(2)


STANDARDS

     The uuid_compare(), uuid_create(), uuid_create_nil(), uuid_equal(),
     uuid_from_string(), uuid_hash(), uuid_is_nil(), and uuid_to_string()
     functions are compatible with the DCE 1.1 RPC specification.


HISTORY

     The UUID functions first appeared in NetBSD 3.0.

NetBSD 10.99                    April 22, 2008                    NetBSD 10.99