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//
// Copyright © 2019 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "SocketProfilingConnection.hpp"
#include <cerrno>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <string>
namespace armnn
{
namespace profiling
{
SocketProfilingConnection::SocketProfilingConnection()
{
memset(m_Socket, 0, sizeof(m_Socket));
// Note: we're using Linux specific SOCK_CLOEXEC flag.
m_Socket[0].fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (m_Socket[0].fd == -1)
{
throw armnn::RuntimeException(std::string("Socket construction failed: ") + strerror(errno));
}
// Connect to the named unix domain socket.
struct sockaddr_un server{};
memset(&server, 0, sizeof(sockaddr_un));
// As m_GatorNamespace begins with a null character we need to ignore that when getting its length.
memcpy(server.sun_path, m_GatorNamespace, strlen(m_GatorNamespace + 1) + 1);
server.sun_family = AF_UNIX;
if (0 != connect(m_Socket[0].fd, reinterpret_cast<const sockaddr*>(&server), sizeof(sockaddr_un)))
{
Close();
throw armnn::RuntimeException(std::string("Cannot connect to stream socket: ") + strerror(errno));
}
// Our socket will only be interested in polling reads.
m_Socket[0].events = POLLIN;
// Make the socket non blocking.
const int currentFlags = fcntl(m_Socket[0].fd, F_GETFL);
if (0 != fcntl(m_Socket[0].fd, F_SETFL, currentFlags | O_NONBLOCK))
{
Close();
throw armnn::RuntimeException(std::string("Failed to set socket as non blocking: ") + strerror(errno));
}
}
bool SocketProfilingConnection::IsOpen() const
{
return m_Socket[0].fd > 0;
}
void SocketProfilingConnection::Close()
{
if (close(m_Socket[0].fd) != 0)
{
throw armnn::RuntimeException(std::string("Cannot close stream socket: ") + strerror(errno));
}
memset(m_Socket, 0, sizeof(m_Socket));
}
bool SocketProfilingConnection::WritePacket(const unsigned char* buffer, uint32_t length)
{
if (buffer == nullptr || length == 0)
{
return false;
}
return write(m_Socket[0].fd, buffer, length) != -1;
}
Packet SocketProfilingConnection::ReadPacket(uint32_t timeout)
{
// Is there currently at least a header worth of data waiting to be read?
int bytes_available = 0;
ioctl(m_Socket[0].fd, FIONREAD, &bytes_available);
if (bytes_available >= 8)
{
// Yes there is. Read it:
return ReceivePacket();
}
// Poll for data on the socket or until timeout occurs
int pollResult = poll(m_Socket, 1, static_cast<int>(timeout));
switch (pollResult)
{
case -1: // Error
throw armnn::RuntimeException(std::string("Read failure from socket: ") + strerror(errno));
case 0: // Timeout
throw TimeoutException("Timeout while reading from socket");
default: // Normal poll return but it could still contain an error signal
// Check if the socket reported an error
if (m_Socket[0].revents & (POLLNVAL | POLLERR | POLLHUP))
{
if (m_Socket[0].revents == POLLNVAL)
{
// This is an unrecoverable error.
Close();
throw armnn::RuntimeException(std::string("Error while polling receiving socket: POLLNVAL"));
}
if (m_Socket[0].revents == POLLERR)
{
throw armnn::RuntimeException(std::string("Error while polling receiving socket: POLLERR: ") +
strerror(errno));
}
if (m_Socket[0].revents == POLLHUP)
{
// This is an unrecoverable error.
Close();
throw armnn::RuntimeException(std::string("Connection closed by remote client: POLLHUP"));
}
}
// Check if there is data to read
if (!(m_Socket[0].revents & (POLLIN)))
{
// This is a corner case. The socket as been woken up but not with any data.
// We'll throw a timeout exception to loop around again.
throw armnn::TimeoutException("File descriptor was polled but no data was available to receive.");
}
return ReceivePacket();
}
}
Packet SocketProfilingConnection::ReceivePacket()
{
char header[8] = {};
ssize_t receiveResult = recv(m_Socket[0].fd, &header, sizeof(header), 0);
// We expect 8 as the result here. 0 means EOF, socket is closed. -1 means there been some other kind of error.
switch( receiveResult )
{
case 0:
// Socket has closed.
Close();
throw armnn::RuntimeException("Remote socket has closed the connection.");
case -1:
// There's been a socket error. We will presume it's unrecoverable.
Close();
throw armnn::RuntimeException(std::string("Error occured on recv: ") + strerror(errno));
default:
if (receiveResult < 8)
{
throw armnn::RuntimeException("The received packet did not contains a valid MIPE header");
}
break;
}
// stream_metadata_identifier is the first 4 bytes
uint32_t metadataIdentifier = 0;
std::memcpy(&metadataIdentifier, header, sizeof(metadataIdentifier));
// data_length is the next 4 bytes
uint32_t dataLength = 0;
std::memcpy(&dataLength, header + 4u, sizeof(dataLength));
std::unique_ptr<unsigned char[]> packetData;
if (dataLength > 0)
{
packetData = std::make_unique<unsigned char[]>(dataLength);
ssize_t receivedLength = recv(m_Socket[0].fd, packetData.get(), dataLength, 0);
if (receivedLength < 0)
{
throw armnn::RuntimeException(std::string("Error occured on recv: ") + strerror(errno));
}
if (dataLength != static_cast<uint32_t>(receivedLength))
{
// What do we do here if we can't read in a full packet?
throw armnn::RuntimeException("Invalid MIPE packet");
}
}
return Packet(metadataIdentifier, dataLength, packetData);
}
} // namespace profiling
} // namespace armnn
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