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Uuid_unparse() doesn't allocate it's own memory to avoid a segmentation fault upon execution you must do that with manually with uuid = malloc(37) (you can also store the UUID in a char array of that length: char uuid ). Equivalent of printf("%s\n", uuid) - just my personal preference * whose case depends on the system's locale. * Produces a UUID string at uuid consisting of letters * Produces a UUID string at uuid consisting of lower-case letters. * Produces a UUID string at uuid consisting of capital letters.
C UUID GENERATOR PLUS
37 is the length of a UUID (36 characters), plus '\0'. GUID - generate Globally Unique Identifier based on random UUID. * uuid_unparse() doesn't allocate memory for itself, so do that with UUID - Universally Unique IDentifier - 128 bits unique number. * binuuid to get a usable 36-character string. * for the UUID generated is in binary format * in the 'unparsed' UUID will depend on your system's locale). * Don't uncomment either if you don't care (the case of the letters * Uncomment to always generate lower-case UUIDs. * Uncomment to always generate capital UUIDs. If digit M is 1 then the UUID is version-1, if M is 3 then the UUID is. The version is straight forward to decode. The version and variant are encoding within UUIDs. The variant is represented in the 17th digit ('N' in the diagram below).
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* For uuid_generate() and uuid_unparse() */ The UUID version is represented by the 13th digit of a hexadecimal UUID string ('M' in the diagram below). This is a simple program that generates an entropy-based (random) UUID and writes it to stdout, then exits with status 0. The uuid will be generated based on high-quality randomness from /dev/urandom. (Packages libuuid1 and uuid-dev on Debian.) The uuidgenerate function creates a new universally unique identifier (UUID). This functionality is provided by libuuid.