String HHVM_FUNCTION(uniqid, const String& prefix /* = null_string */,
bool more_entropy /* = false */) {
if (!more_entropy) {
Transport *transport = g_context->getTransport();
if (transport) {
transport->incuSleepTime(1);
}
usleep(1);
}
struct timeval tv;
gettimeofday((struct timeval *)&tv, NULL);
int sec = (int)tv.tv_sec;
int usec = (int)(tv.tv_usec % 0x100000);
String uniqid(prefix.size() + 64, ReserveString);
auto ptr = uniqid.mutableData();
// StringData::capacity() returns the buffer size without the null
// terminator. snprintf expects a the buffer capacity including room
// for the null terminator, writes the null termintor, and returns
// the full length not counting the null terminator.
auto capacity = uniqid.capacity() + 1;
int64_t len;
if (more_entropy) {
len = snprintf(ptr, capacity, "%s%08x%05x%.8F",
prefix.c_str(), sec, usec, math_combined_lcg() * 10);
} else {
len = snprintf(ptr, capacity, "%s%08x%05x",
prefix.c_str(), sec, usec);
}
uniqid.setSize(len);
return uniqid;
}
String HHVM_FUNCTION(uniqid, const String& prefix /* = null_string */,
bool more_entropy /* = false */) {
if (!more_entropy) {
Transport *transport = g_context->getTransport();
if (transport) {
transport->incuSleepTime(1);
}
usleep(1);
}
struct timeval tv;
gettimeofday((struct timeval *)&tv, NULL);
int sec = (int)tv.tv_sec;
int usec = (int)(tv.tv_usec % 0x100000);
String uniqid(prefix.size() + 64, ReserveString);
auto ptr = uniqid.bufferSlice().ptr;
auto capacity = uniqid.get()->capacity();
int64_t len;
if (more_entropy) {
len = snprintf(ptr, capacity, "%s%08x%05x%.8F",
prefix.c_str(), sec, usec, math_combined_lcg() * 10);
} else {
len = snprintf(ptr, capacity, "%s%08x%05x",
prefix.c_str(), sec, usec);
}
uniqid.setSize(len);
return uniqid;
}
String f_uniqid(const String& prefix /* = null_string */,
bool more_entropy /* = false */) {
if (!more_entropy) {
Transport *transport = g_context->getTransport();
if (transport) {
transport->incuSleepTime(1);
}
usleep(1);
}
struct timeval tv;
gettimeofday((struct timeval *)&tv, NULL);
int sec = (int)tv.tv_sec;
int usec = (int)(tv.tv_usec % 0x100000);
char uniqid[256];
if (more_entropy) {
snprintf(uniqid, sizeof(uniqid), "%s%08x%05x%.8F",
prefix.c_str(), sec, usec, math_combined_lcg() * 10);
} else {
snprintf(uniqid, sizeof(uniqid), "%s%08x%05x",
prefix.c_str(), sec, usec);
}
return String(uniqid, CopyString);
}
void HHVM_FUNCTION(usleep, int micro_seconds) {
IOStatusHelper io("usleep");
Transport *transport = g_context->getTransport();
if (transport) {
transport->incuSleepTime(micro_seconds);
}
usleep(micro_seconds);
}
