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//
// Copyright © 2019 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "SocketProfilingConnection.hpp"
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <cerrno>
#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::Exception(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(m_Socket[0].fd);
throw armnn::Exception(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(m_Socket[0].fd);
throw armnn::Exception(std::string(": Failed to set socket as non blocking: ") + strerror(errno));
}
}
bool SocketProfilingConnection::IsOpen()
{
if (m_Socket[0].fd > 0)
{
return true;
}
return false;
}
void SocketProfilingConnection::Close()
{
if (0 == close(m_Socket[0].fd))
{
memset(m_Socket, 0, sizeof(m_Socket));
}
else
{
throw armnn::Exception(std::string(": Cannot close stream socket: ") + strerror(errno));
}
}
bool SocketProfilingConnection::WritePacket(const char* buffer, uint32_t length)
{
if (-1 == write(m_Socket[0].fd, buffer, length))
{
return false;
}
return true;
}
Packet SocketProfilingConnection::ReadPacket(uint32_t timeout)
{
// Poll for data on the socket or until timeout.
int pollResult = poll(m_Socket, 1, static_cast<int>(timeout));
if (pollResult > 0)
{
// Normal poll return but it could still contain an error signal.
if (m_Socket[0].revents & (POLLNVAL | POLLERR | POLLHUP))
{
throw armnn::Exception(std::string(": Read failure from socket: ") + strerror(errno));
}
else if (m_Socket[0].revents & (POLLIN)) // There is data to read.
{
// Read the header first.
char header[8];
if (8 != recv(m_Socket[0].fd, &header, sizeof header, 0))
{
// What do we do here if there's not a valid 8 byte header to read?
throw armnn::Exception(": Received packet did not contains a valid MIPE header. ");
}
// stream_metadata_identifier is the first 4 bytes.
uint32_t metadataIdentifier = static_cast<uint32_t>(header[0]) << 24 |
static_cast<uint32_t>(header[1]) << 16 |
static_cast<uint32_t>(header[2]) << 8 |
static_cast<uint32_t>(header[3]);
// data_length is the next 4 bytes.
uint32_t dataLength = static_cast<uint32_t>(header[4]) << 24 |
static_cast<uint32_t>(header[5]) << 16 |
static_cast<uint32_t>(header[6]) << 8 |
static_cast<uint32_t>(header[7]);
std::unique_ptr<char[]> packetData;
if (dataLength > 0)
{
packetData = std::make_unique<char[]>(dataLength);
}
if (dataLength != recv(m_Socket[0].fd, packetData.get(), dataLength, 0))
{
// What do we do here if we can't read in a full packet?
throw armnn::Exception(": Invalid MIPE packet.");
}
return {metadataIdentifier, dataLength, packetData};
}
else // Some unknown return signal.
{
throw armnn::Exception(": Poll returned an unexpected event." );
}
}
else if (pollResult == -1)
{
throw armnn::Exception(std::string(": Read failure from socket: ") + strerror(errno));
}
else // it's 0 so a timeout.
{
throw armnn::Exception(": Timeout while reading from socket.");
}
}
} // namespace profiling
} // namespace armnn
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