diff options
Diffstat (limited to 'src/backend/utils/adt/uuid.c')
| -rw-r--r-- | src/backend/utils/adt/uuid.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/backend/utils/adt/uuid.c b/src/backend/utils/adt/uuid.c index 09aa6b6daab..589c2d51dde 100644 --- a/src/backend/utils/adt/uuid.c +++ b/src/backend/utils/adt/uuid.c @@ -416,3 +416,23 @@ uuid_hash_extended(PG_FUNCTION_ARGS) return hash_any_extended(key->data, UUID_LEN, PG_GETARG_INT64(1)); } + +Datum +gen_random_uuid(PG_FUNCTION_ARGS) +{ + pg_uuid_t *uuid = palloc(UUID_LEN); + + if (!pg_strong_random(uuid, UUID_LEN)) + ereport(ERROR, + (errcode(ERRCODE_INTERNAL_ERROR), + errmsg("could not generate random values"))); + + /* + * Set magic numbers for a "version 4" (pseudorandom) UUID, see + * http://tools.ietf.org/html/rfc4122#section-4.4 + */ + uuid->data[6] = (uuid->data[6] & 0x0f) | 0x40; /* time_hi_and_version */ + uuid->data[8] = (uuid->data[8] & 0x3f) | 0x80; /* clock_seq_hi_and_reserved */ + + PG_RETURN_UUID_P(uuid); +} |