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/*
Copyright (c) 2007-2010 iMatix Corporation
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "fd_signaler.hpp"
#include "platform.hpp"
#include "err.hpp"
#include "fd.hpp"
#include "ip.hpp"
#if defined ZMQ_HAVE_OPENVMS
#include <netinet/tcp.h>
#elif defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <unistd.h>
#include <fcntl.h>
#endif
#if defined ZMQ_HAVE_EVENTFD
#include <sys/eventfd.h>
zmq::fd_signaler_t::fd_signaler_t ()
{
// Create eventfd object.
fd = eventfd (0, 0);
errno_assert (fd != -1);
// Set to non-blocking mode.
int flags = fcntl (fd, F_GETFL, 0);
if (flags == -1)
flags = 0;
int rc = fcntl (fd, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
}
zmq::fd_signaler_t::~fd_signaler_t ()
{
int rc = close (fd);
errno_assert (rc != -1);
}
void zmq::fd_signaler_t::signal (int signal_)
{
zmq_assert (signal_ >= 0 && signal_ < 64);
uint64_t inc = 1;
inc <<= signal_;
ssize_t sz = write (fd, &inc, sizeof (uint64_t));
errno_assert (sz == sizeof (uint64_t));
}
uint64_t zmq::fd_signaler_t::poll ()
{
// Set to blocking mode.
int flags = fcntl (fd, F_GETFL, 0);
if (flags == -1)
flags = 0;
int rc = fcntl (fd, F_SETFL, flags & ~O_NONBLOCK);
errno_assert (rc != -1);
uint64_t signals;
ssize_t sz;
while (true) {
sz = read (fd, &signals, sizeof (uint64_t));
if (sz == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
errno_assert (false);
}
break;
}
// Set to non-blocking mode.
rc = fcntl (fd, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
return signals;
}
uint64_t zmq::fd_signaler_t::check ()
{
uint64_t signals;
ssize_t sz = read (fd, &signals, sizeof (uint64_t));
if (sz == -1 && (errno == EAGAIN || errno == EINTR))
return 0;
errno_assert (sz != -1);
return signals;
}
zmq::fd_t zmq::fd_signaler_t::get_fd ()
{
return fd;
}
#elif defined ZMQ_HAVE_WINDOWS
zmq::fd_signaler_t::fd_signaler_t ()
{
// Windows have no 'socketpair' function. CreatePipe is no good as pipe
// handles cannot be polled on. Here we create the socketpair by hand.
struct sockaddr_in addr;
SOCKET listener;
int addrlen = sizeof (addr);
w = INVALID_SOCKET;
r = INVALID_SOCKET;
fd_t rcs = (listener = socket (AF_INET, SOCK_STREAM, 0));
wsa_assert (rcs != INVALID_SOCKET);
memset (&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
addr.sin_port = 0;
int rc = bind (listener, (const struct sockaddr*) &addr, sizeof (addr));
wsa_assert (rc != SOCKET_ERROR);
rc = getsockname (listener, (struct sockaddr*) &addr, &addrlen);
wsa_assert (rc != SOCKET_ERROR);
// Listen for incomming connections.
rc = listen (listener, 1);
wsa_assert (rc != SOCKET_ERROR);
// Create the socket.
w = WSASocket (AF_INET, SOCK_STREAM, 0, NULL, 0, 0);
wsa_assert (w != INVALID_SOCKET);
// Connect to the remote peer.
rc = connect (w, (sockaddr *) &addr, sizeof (addr));
wsa_assert (rc != SOCKET_ERROR);
// Accept connection from w.
r = accept (listener, NULL, NULL);
wsa_assert (r != INVALID_SOCKET);
// Set the read site of the pair to non-blocking mode.
unsigned long argp = 1;
rc = ioctlsocket (r, FIONBIO, &argp);
wsa_assert (rc != SOCKET_ERROR);
// We don't need the listening socket anymore. Close it.
rc = closesocket (listener);
wsa_assert (rc != SOCKET_ERROR);
}
zmq::fd_signaler_t::~fd_signaler_t ()
{
int rc = closesocket (w);
wsa_assert (rc != SOCKET_ERROR);
rc = closesocket (r);
wsa_assert (rc != SOCKET_ERROR);
}
void zmq::fd_signaler_t::signal (int signal_)
{
// TODO: Note that send is a blocking operation.
// How should we behave if the signal cannot be written to the signaler?
zmq_assert (signal_ >= 0 && signal_ < 64);
char c = (char) signal_;
int rc = send (w, &c, 1, 0);
win_assert (rc != SOCKET_ERROR);
}
uint64_t zmq::fd_signaler_t::poll ()
{
// Switch to blocking mode.
unsigned long argp = 0;
int rc = ioctlsocket (r, FIONBIO, &argp);
wsa_assert (rc != SOCKET_ERROR);
// Get the signals. Given that we are in the blocking mode now,
// there should be at least a single signal returned.
uint64_t signals = check ();
zmq_assert (signals);
// Switch back to non-blocking mode.
argp = 1;
rc = ioctlsocket (r, FIONBIO, &argp);
wsa_assert (rc != SOCKET_ERROR);
return signals;
}
uint64_t zmq::fd_signaler_t::check ()
{
unsigned char buffer [32];
int nbytes = recv (r, (char*) buffer, 32, 0);
if (nbytes == -1 && WSAGetLastError () == WSAEWOULDBLOCK)
return 0;
wsa_assert (nbytes != -1);
uint64_t signals = 0;
for (int pos = 0; pos != nbytes; pos++) {
zmq_assert (buffer [pos] < 64);
signals |= (uint64_t (1) << (buffer [pos]));
}
return signals;
}
zmq::fd_t zmq::fd_signaler_t::get_fd ()
{
return r;
}
#elif defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX
#include <sys/types.h>
#include <sys/socket.h>
zmq::fd_signaler_t::fd_signaler_t ()
{
int sv [2];
int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
errno_assert (rc == 0);
w = sv [0];
r = sv [1];
// Set the reader to non-blocking mode.
int flags = fcntl (r, F_GETFL, 0);
if (flags == -1)
flags = 0;
rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
}
zmq::fd_signaler_t::~fd_signaler_t ()
{
close (w);
close (r);
}
void zmq::fd_signaler_t::signal (int signal_)
{
zmq_assert (signal_ >= 0 && signal_ < 64);
unsigned char c = (unsigned char) signal_;
ssize_t nbytes = send (w, &c, 1, 0);
errno_assert (nbytes == 1);
}
uint64_t zmq::fd_signaler_t::poll ()
{
// Set the reader to blocking mode.
int flags = fcntl (r, F_GETFL, 0);
if (flags == -1)
flags = 0;
int rc = fcntl (r, F_SETFL, flags & ~O_NONBLOCK);
errno_assert (rc != -1);
// Poll for events.
uint64_t signals = check ();
// Set the reader to non-blocking mode.
flags = fcntl (r, F_GETFL, 0);
if (flags == -1)
flags = 0;
rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
return signals;
}
uint64_t zmq::fd_signaler_t::check ()
{
unsigned char buffer [64];
ssize_t nbytes = recv (r, buffer, 64, 0);
if (nbytes == -1 && errno == EAGAIN)
return 0;
zmq_assert (nbytes != -1);
uint64_t signals = 0;
for (int pos = 0; pos != nbytes; pos ++) {
zmq_assert (buffer [pos] < 64);
signals |= (uint64_t (1) << (buffer [pos]));
}
return signals;
}
zmq::fd_t zmq::fd_signaler_t::get_fd ()
{
return r;
}
#else
#include <sys/types.h>
#include <sys/socket.h>
zmq::fd_signaler_t::fd_signaler_t ()
{
int sv [2];
int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
errno_assert (rc == 0);
w = sv [0];
r = sv [1];
}
zmq::fd_signaler_t::~fd_signaler_t ()
{
close (w);
close (r);
}
void zmq::fd_signaler_t::signal (int signal_)
{
// TODO: Note that send is a blocking operation.
// How should we behave if the signal cannot be written to the signaler?
zmq_assert (signal_ >= 0 && signal_ < 64);
unsigned char c = (unsigned char) signal_;
ssize_t nbytes = send (w, &c, 1, 0);
errno_assert (nbytes == 1);
}
uint64_t zmq::fd_signaler_t::poll ()
{
unsigned char buffer [64];
ssize_t nbytes = recv (r, buffer, 64, 0);
zmq_assert (nbytes != -1);
uint64_t signals = 0;
for (int pos = 0; pos != nbytes; pos ++) {
zmq_assert (buffer [pos] < 64);
signals |= (uint64_t (1) << (buffer [pos]));
}
return signals;
}
uint64_t zmq::fd_signaler_t::check ()
{
unsigned char buffer [64];
ssize_t nbytes = recv (r, buffer, 64, MSG_DONTWAIT);
if (nbytes == -1 && errno == EAGAIN)
return 0;
zmq_assert (nbytes != -1);
uint64_t signals = 0;
for (int pos = 0; pos != nbytes; pos ++) {
zmq_assert (buffer [pos] < 64);
signals |= (uint64_t (1) << (buffer [pos]));
}
return signals;
}
zmq::fd_t zmq::fd_signaler_t::get_fd ()
{
return r;
}
#endif
#if defined ZMQ_HAVE_OPENVMS
int zmq::fd_signaler_t::socketpair (int domain_, int type_, int protocol_,
int sv_ [2])
{
int listener;
sockaddr_in lcladdr;
socklen_t lcladdr_len;
int rc;
int on = 1;
zmq_assert (type_ == SOCK_STREAM);
// Fill in the localhost address (127.0.0.1).
memset (&lcladdr, 0, sizeof (lcladdr));
lcladdr.sin_family = AF_INET;
lcladdr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
lcladdr.sin_port = 0;
listener = socket (AF_INET, SOCK_STREAM, 0);
errno_assert (listener != -1);
rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
errno_assert (rc != -1);
rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
errno_assert (rc != -1);
rc = bind(listener, (struct sockaddr*) &lcladdr, sizeof (lcladdr));
errno_assert (rc != -1);
lcladdr_len = sizeof (lcladdr);
rc = getsockname (listener, (struct sockaddr*) &lcladdr, &lcladdr_len);
errno_assert (rc != -1);
rc = listen (listener, 1);
errno_assert (rc != -1);
sv_ [0] = socket (AF_INET, SOCK_STREAM, 0);
errno_assert (rc != -1);
rc = setsockopt (sv_ [0], IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
errno_assert (rc != -1);
rc = setsockopt (sv_ [0], IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
errno_assert (rc != -1);
rc = connect (sv_ [0], (struct sockaddr*) &lcladdr, sizeof (lcladdr));
errno_assert (rc != -1);
sv_ [1] = accept (listener, NULL, NULL);
errno_assert (sv_ [1] != -1);
close (listener);
return 0;
}
#endif
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