| // |
| // 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 |