UnixDatagramSocket.cpp

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#include "UnixDatagramSocket.h"
#include "TempFailure.h"

#include <sys/socket.h>
#include <sys/un.h>
#include <poll.h>

using namespace NET;

UnixDatagramSocket::UnixDatagramSocket()
: UnixSocket( DATAGRAM, 0)
{}

void UnixDatagramSocket::sendTo( const void* buffer, size_t len, const std::string& foreignPath)
{
    sockaddr_un destAddr;
    fillAddress( foreignPath, destAddr);

    int sent = TEMP_FAILURE_RETRY (::sendto( m_socket, (const raw_type*)buffer, len, 0, (sockaddr*)&destAddr, sizeof(destAddr)));

    // Write out the whole buffer as a single message
    if( sent != (int)len)
        throw SocketException("Send failed (sendto)");
}

int UnixDatagramSocket::receiveFrom( void* buffer, size_t len, std::string& sourcePath)
{
    sockaddr_un clientAddr;
    socklen_t addr_len = sizeof(clientAddr);

    int ret = TEMP_FAILURE_RETRY (::recvfrom( m_socket, (raw_type*)buffer, len, 0, (sockaddr*)&clientAddr, &addr_len));
    if( ret < 0)
        throw SocketException("Receive failed (recvfrom)");

    sourcePath = extractPath( clientAddr, addr_len);
    return ret;
}

int UnixDatagramSocket::timedReceiveFrom( void* buffer, size_t len, std::string& sourcePath, int timeout)
{
    struct pollfd poll;
    poll.fd = m_socket;
    poll.events = POLLIN | POLLPRI | POLLRDHUP;

    int ret = TEMP_FAILURE_RETRY (::poll( &poll, 1, timeout));

    if( ret == 0) return 0;
    if( ret < 0)  throw SocketException("Receive failed (poll)");

    if( poll.revents & POLLRDHUP)
        m_peerDisconnected = true;

    if( poll.revents & POLLIN || poll.revents & POLLPRI)
        return receiveFrom( buffer, len, sourcePath);

    return 0;
}