54 // This class is used to generate random GUID.
55 // Currently use random number to generate a GUID since Linux has
56 // no native GUID generator. This should be OK since we don't expect
75   static bool CreateGUID(GUID *guid) {  in CreateGUID()  argument
77     CreateGuidFromArc4Random(guid);  in CreateGUID()
82     success = CreateGUIDFromGetrandom(guid);  in CreateGUID()
85       success = CreateGUIDFromDevUrandom(guid);  in CreateGUID()
89       CreateGUIDFromRand(guid);  in CreateGUID()
95     guid->data3 &= 0x0fff;  in CreateGUID()
96     guid->data3 |= 0x4000;  in CreateGUID()
99     guid->data4[0] &= 0x3f;  in CreateGUID()
100     guid->data4[0] |= 0x80;  in CreateGUID()
107   static void CreateGuidFromArc4Random(GUID *guid) {  in CreateGuidFromArc4Random()  argument
108     char *buf = reinterpret_cast<char *>(guid);  in CreateGuidFromArc4Random()
110     for (size_t i = 0; i < sizeof(GUID); i += sizeof(uint32_t)) {  in CreateGuidFromArc4Random()
131   static bool CreateGUIDFromGetrandom(GUID *guid) {
132     char *buf = reinterpret_cast<char *>(guid);
133     int read_bytes = getrandom(buf, sizeof(GUID), GRND_NONBLOCK);
135     return (read_bytes == static_cast<int>(sizeof(GUID)));
139   // Populate the GUID using random bytes read from /dev/urandom, returns false
140   // if the GUID wasn't fully populated with random data.
141   static bool CreateGUIDFromDevUrandom(GUID *guid) {
142     char *buf = reinterpret_cast<char *>(guid);
149     ssize_t read_bytes = HANDLE_EINTR(read(fd, buf, sizeof(GUID)));
152     return (read_bytes == static_cast<ssize_t>(sizeof(GUID)));
155   // Populate the GUID using a stream of random bytes obtained from rand().
156   static void CreateGUIDFromRand(GUID *guid) {
157     char *buf = reinterpret_cast<char *>(guid);
161     for (size_t i = 0; i < sizeof(GUID); i++) {
172 bool CreateGUID(GUID *guid) {  in CreateGUID()  argument
173   return GUIDGenerator::CreateGUID(guid);  in CreateGUID()
176 // Parse guid to string.
177 bool GUIDToString(const GUID *guid, char *buf, int buf_len) {  in GUIDToString()  argument
178   // Should allow more space the the max length of GUID.  in GUIDToString()
181                      guid->data1, guid->data2, guid->data3,  in GUIDToString()
182                      GUIDGenerator::BytesToUInt32(&(guid->data4[0])),  in GUIDToString()
183                      GUIDGenerator::BytesToUInt32(&(guid->data4[4])));  in GUIDToString()