- #LINUX UUID GENERATOR GENERATOR#
- #LINUX UUID GENERATOR MANUAL#
- #LINUX UUID GENERATOR OFFLINE#
- #LINUX UUID GENERATOR MAC#
I don't know if it's a peculiarity of my machine's network configuration or not - but even so it seems to me that this tcllib package should avoid calls that may take such a relatively long time. The delay seems to occur in a call to 'fconfigure -sockname'. This makes the function impractical for most uses. On one of my windows machines - UUID version 1.0.0 calls to take around 4.5 seconds to complete. This proc, by no means, conforms to the standards discussed in the above document, but it does produce unique* identifiers that are good enough for me. Windows provides an API for generating GUIDs and some extensions make use of this, but I needed a pure- Tcl UUID generator. Alternatives to the Tcllib UUID package Damon Courtney's This package turned out to be the culprit.
#LINUX UUID GENERATOR OFFLINE#
I was once offline and a program of mine was hanging. PYK : Warning: This implementation uses info hostname, or exec ipconfig on Windows.
#LINUX UUID GENERATOR GENERATOR#
The uuid package in Tcllib provides a generator of universally unique identifiers (UUID) also known as globally unique identifiers (GUID). Uuid(3), uuidgen(1), uuid_clear(3), uuid_compare(3), uuid_copy(3), uuid_is_null(3), uuid_parse(3), uuid_unparse(3) 1.UUIDs (Universally Unique Identifiers) or GUIDs (Globally Unique Identifiers) are defined in this document: The UUID is 16 bytes (128 bits) long, which gives approximately 3.4x10^38 unique values (there are approximately 10^80 elemntary particles May compromise the uniqueness of UUID's generated in this fashion. Note that the use of a pseudo-random generator dev/urandom) is not available, in which case a pseudo-random generator will be subsituted.
#LINUX UUID GENERATOR MANUAL#
Uuid(3), uuidgen(1), uuid_clear(3), uuid_compare(3), uuid_copy(3), uuid_is_null(3), uuid_parse(3), uuid_time(3), uuid_unparse(3) util-linux May 2009 UUID_GENERATE(3)Ĭheck Out this Related Man Page UUID_GENERATE(3) Library Functions Manual UUID_GENERATE(3) NAME Libuuid is part of the util-linux package since version 2.15.1 and is available from. The newly created UUID is returned in the memory location pointed to by out.
System, and among UUIDs created on other systems in the past and in the future. The new UUID can reasonably be considered unique among all UUIDs created on the local In the universe according to Carl Sagan's Cosmos). The UUID is 16 bytes (128 bits) long, which gives approximately 3.4x10^38 unique values (there are approximately 10^80 elementary particles This can cause privacy problems in some applications, so the uuid_gener-Īte function only uses this algorithm if a high-quality source of randomness is not available.
#LINUX UUID GENERATOR MAC#
This algorithm used to be the default one used to generate UUID, but because of the use of the ethernet MAC address, itĬan leak information about when and where the UUID was generated. The uuid_generate_time function forces the use of the alternative algorithm which uses the current time and the local ethernet MAC address Tor may compromise the uniqueness of UUIDs generated in this fashion. Note that the use of a pseudo-random genera. dev/urandom) is not available, in which case a pseudo-random generator will be substituted. The uuid_generate_random function forces the use of the all-random UUID format, even if a high-quality random number generator (i.e., The local ethernet MAC address (if available), and random data generated using a pseudo-random generator.
If it is not available, then uuid_generate will use an alternative algorithm which uses the current time, The uuid will be generated based on high-quality randomnessįrom /dev/urandom, if available. The uuid_generate function creates a new universally unique identifier (UUID). Uuid_generate, uuid_generate_random, uuid_generate_time - create a new unique UUID value UUID_GENERATE(3) Libuuid API UUID_GENERATE(3) NAME