[Qemu-devel] [PATCH v1 RFC 23/34] io: add QIOChannelSocket class

["Daniel P. Berrange" <berrange@redhat.com>]

Implement a QIOChannel subclass that supports sockets I/O

TBD check errno handling of windows port & fix watch impl

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 include/io/channel-socket.h | 168 +++++++++++++
 io/Makefile.objs            |   1 +
 io/channel-socket.c         | 572 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 741 insertions(+)
 create mode 100644 include/io/channel-socket.h
 create mode 100644 io/channel-socket.c

diff --git a/include/io/channel-socket.h b/include/io/channel-socket.h
new file mode 100644
index 0000000..b95349b
--- /dev/null
+++ b/include/io/channel-socket.h
@@ -0,0 +1,168 @@
+/*
+ * QEMU I/O channels sockets driver
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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 GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef QIO_CHANNEL_SOCKET_H__
+#define QIO_CHANNEL_SOCKET_H__
+
+#include "io/channel.h"
+#include "qemu/sockets.h"
+
+#define TYPE_QIO_CHANNEL_SOCKET "qemu:io-channel-socket"
+#define QIO_CHANNEL_SOCKET(obj)                                     \
+    OBJECT_CHECK(QIOChannelSocket, (obj), TYPE_QIO_CHANNEL_SOCKET)
+
+typedef struct QIOChannelSocket QIOChannelSocket;
+
+/**
+ * QIOChannelSocket:
+ *
+ * The QIOChannelSocket class provides a channel implementation
+ * that can transport data over a UNIX socket or TCP socket.
+ * Beyond the core channel API, it also provides functionality
+ * for accepting client connections, tuning some socket
+ * parameters and getting socket address strings.
+ */
+
+struct QIOChannelSocket {
+    QIOChannel parent;
+    int fd;
+    struct sockaddr_storage localAddr;
+    socklen_t localAddrLen;
+    struct sockaddr_storage remoteAddr;
+    socklen_t remoteAddrLen;
+};
+
+
+/**
+ * qio_channel_socket_new_fd:
+ * @fd: the socket file descriptor
+ * @errp: pointer to an uninitialized error object
+ *
+ * Create a channel for performing I/O on the socket
+ * connection represented by the file descriptor @fd.
+ *
+ * Returns: the socket channel object, or NULL on error
+ */
+QIOChannelSocket *
+qio_channel_socket_new_fd(int fd,
+                          Error **errp);
+
+/**
+ * qio_channel_socket_get_local_addr_string:
+ * @ioc: the socket channel object
+ * @hostname: pointer to be filled with hostname string
+ * @servicename: pointer to be filled with servicename string
+ * @family: pointer to be filled with network address family
+ * @errp: pointer to an uninitialized error object
+ *
+ * Get the string representation of the local socket
+ * address. The address information will be stored in
+ * the @hostname, @servicename and @family parameters.
+ * The @hostname and @servicename strings will be
+ * allocated to the size required and should be free
+ * with g_free() when no longer required
+ *
+ * Returns: 0 on success, -1 on error
+ */
+int
+qio_channel_socket_get_local_addr_string(QIOChannelSocket *ioc,
+                                         char **hostname,
+                                         char **servicename,
+                                         NetworkAddressFamily *family,
+                                         Error **errp);
+
+/**
+ * qio_channel_socket_get_remote_addr_string:
+ * @ioc: the socket channel object
+ * @hostname: pointer to be filled with hostname string
+ * @servicename: pointer to be filled with servicename string
+ * @family: pointer to be filled with network address family
+ * @errp: pointer to an uninitialized error object
+ *
+ * Get the string representation of the remote socket
+ * address. The address information will be stored in
+ * the @hostname, @servicename and @family parameters.
+ * The @hostname and @servicename strings will be
+ * allocated to the size required and should be free
+ * with g_free() when no longer required
+ *
+ * Returns: 0 on success, -1 on error
+ */
+int
+qio_channel_socket_get_remote_addr_string(QIOChannelSocket *ioc,
+                                          char **hostname,
+                                          char **servicename,
+                                          NetworkAddressFamily *family,
+                                          Error **errp);
+
+/**
+ * qio_channel_socket_set_nodelay:
+ * @ioc: the socket channel object
+ * @enabled: the new flag state
+ *
+ * Set the state of the NODELAY socket flag. If the
+ * @enabled parameter is true, then NODELAY will be
+ * set and data will be transmitted immediately. If
+ * @enabled is false, then data may be temporarily
+ * held for transmission to enable writes to be
+ * coallesced.
+ */
+void
+qio_channel_socket_set_nodelay(QIOChannelSocket *ioc,
+                               bool enabled);
+
+/**
+ * qio_channel_socket_accept:
+ * @ioc: the socket channel object
+ * @errp: pointer to an uninitialized error object
+ *
+ * If the socket represents a server, then this accepts
+ * a new client connection. The returned channel will
+ * represent the connected client socket.
+ *
+ * Returns: the new client channel, or NULL on error
+ */
+QIOChannelSocket *
+qio_channel_socket_accept(QIOChannelSocket *ioc,
+                          Error **errp);
+
+typedef enum {
+    QIO_CHANNEL_SOCKET_SHUTDOWN_BOTH,
+    QIO_CHANNEL_SOCKET_SHUTDOWN_READ,
+    QIO_CHANNEL_SOCKET_SHUTDOWN_WRITE,
+} QIOChannelSocketShutdown;
+
+/**
+ * qio_channel_socket_shutdown:
+ * @ioc: the socket channel object
+ * @how: the direction to shutdown
+ * @errp: pointer to an uninitialized error object
+ *
+ * Shutdowns transmission or receiving on a socket
+ * without closing the socket file descriptor.
+ *
+ * Returns: 0 on success, -1 on error
+ */
+int
+qio_channel_socket_shutdown(QIOChannelSocket *ioc,
+                            QIOChannelSocketShutdown how,
+                            Error **errp);
+
+#endif /* QIO_CHANNEL_SOCKET_H__ */
diff --git a/io/Makefile.objs b/io/Makefile.objs
index a776676..4f5e276 100644
--- a/io/Makefile.objs
+++ b/io/Makefile.objs
@@ -1,2 +1,3 @@
 util-obj-y += channel.o
 util-obj-y += channel-unix.o
+util-obj-y += channel-socket.o
diff --git a/io/channel-socket.c b/io/channel-socket.c
new file mode 100644
index 0000000..5eacf38
--- /dev/null
+++ b/io/channel-socket.c
@@ -0,0 +1,572 @@
+/*
+ * QEMU I/O channels sockets driver
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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 GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <glib/gi18n.h>
+
+#include "io/channel-socket.h"
+#include "io/channel-unix.h"
+
+#define SOCKET_MAX_FDS 16
+
+static int
+qio_channel_socket_get_addr_string(struct sockaddr_storage *sa,
+                                   socklen_t salen,
+                                   char **hostname,
+                                   char **servicename,
+                                   NetworkAddressFamily *family,
+                                   Error **errp)
+{
+    char host[NI_MAXHOST];
+    char serv[NI_MAXSERV];
+    int ret;
+
+    ret = getnameinfo((struct sockaddr *)sa, salen,
+                      host, sizeof(host),
+                      serv, sizeof(serv),
+                      NI_NUMERICHOST | NI_NUMERICSERV);
+    if (ret != 0) {
+        error_setg(errp, "Cannot format numeric socket address: %s\n",
+                   gai_strerror(ret));
+        return -1;
+    }
+
+    *hostname = g_strdup(host);
+    *servicename = g_strdup(serv);
+    *family = inet_netfamily(sa->ss_family);
+    return 0;
+}
+
+int
+qio_channel_socket_get_local_addr_string(QIOChannelSocket *ioc,
+                                         char **hostname,
+                                         char **servicename,
+                                         NetworkAddressFamily *family,
+                                         Error **errp)
+{
+    return qio_channel_socket_get_addr_string(&ioc->localAddr,
+                                              ioc->localAddrLen,
+                                              hostname,
+                                              servicename,
+                                              family,
+                                              errp);
+}
+
+int
+qio_channel_socket_get_remote_addr_string(QIOChannelSocket *ioc,
+                                          char **hostname,
+                                          char **servicename,
+                                          NetworkAddressFamily *family,
+                                          Error **errp)
+{
+    return qio_channel_socket_get_addr_string(&ioc->remoteAddr,
+                                              ioc->remoteAddrLen,
+                                              hostname,
+                                              servicename,
+                                              family,
+                                              errp);
+}
+
+QIOChannelSocket *
+qio_channel_socket_new_fd(int fd,
+                          Error **errp)
+{
+    QIOChannelSocket *ioc;
+
+    ioc = QIO_CHANNEL_SOCKET(object_new(TYPE_QIO_CHANNEL_SOCKET));
+
+    ioc->fd = fd;
+    ioc->remoteAddrLen = sizeof(ioc->remoteAddr);
+    ioc->localAddrLen = sizeof(ioc->localAddr);
+
+    if (getpeername(fd, (struct sockaddr *)&ioc->remoteAddr,
+                    &ioc->remoteAddrLen) < 0) {
+        if (socket_error() == ENOTCONN) {
+            memset(&ioc->remoteAddr, 0, sizeof(ioc->remoteAddr));
+            ioc->remoteAddrLen = sizeof(ioc->remoteAddr);
+        } else {
+            error_setg_errno(errp, socket_error(), "%s",
+                             _("Unable to query remote socket address"));
+            goto error;
+        }
+    }
+
+    if (getsockname(fd, (struct sockaddr *)&ioc->localAddr,
+                    &ioc->localAddrLen) < 0) {
+        error_setg_errno(errp, socket_error(), "%s",
+                         _("Unable to query local socket address"));
+        goto error;
+    }
+
+    return ioc;
+
+ error:
+    ioc->fd = -1; /* Let the caller close FD on failure */
+    object_unref(OBJECT(ioc));
+    return NULL;
+}
+
+QIOChannelSocket *
+qio_channel_socket_accept(QIOChannelSocket *ioc,
+                          Error **errp)
+{
+    QIOChannelSocket *cioc;
+
+    cioc = QIO_CHANNEL_SOCKET(object_new(TYPE_QIO_CHANNEL_SOCKET));
+    cioc->fd = -1;
+    cioc->remoteAddrLen = sizeof(ioc->remoteAddr);
+    cioc->localAddrLen = sizeof(ioc->localAddr);
+
+ retry:
+    cioc->fd = accept(ioc->fd, (struct sockaddr *)&cioc->remoteAddr,
+                      &cioc->remoteAddrLen);
+    if (cioc->fd < 0) {
+        if (socket_error() == EINTR) {
+            goto retry;
+        }
+        goto error;
+    }
+
+    if (getsockname(cioc->fd, (struct sockaddr *)&ioc->localAddr,
+                    &ioc->localAddrLen) < 0) {
+        error_setg_errno(errp, socket_error(), "%s",
+                         _("Unable to query local socket address"));
+        goto error;
+    }
+
+    return cioc;
+
+ error:
+    object_unref(OBJECT(cioc));
+    return NULL;
+}
+
+static void qio_channel_socket_init(Object *obj)
+{
+    QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
+    ioc->fd = -1;
+}
+
+static void qio_channel_socket_finalize(Object *obj)
+{
+    QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
+    if (ioc->fd != -1) {
+        close(ioc->fd);
+        ioc->fd = -1;
+    }
+}
+
+static bool qio_channel_socket_has_feature(QIOChannel *ioc,
+                                           QIOChannelFeature feature)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+
+    switch (feature) {
+    case QIO_CHANNEL_FEATURE_FD_PASS:
+#ifndef WIN32
+        if (sioc->localAddr.ss_family == AF_UNIX) {
+            return true;
+        } else {
+#endif /* WIN32 */
+            return false;
+#ifndef WIN32
+        }
+#endif /* WIN32 */
+    default:
+        return false;
+    }
+}
+
+
+#ifndef WIN32
+static void qio_channel_socket_copy_fds(struct msghdr *msg,
+                                        int **fds, size_t *nfds)
+{
+    struct cmsghdr *cmsg;
+
+    *nfds = 0;
+    *fds = NULL;
+
+    for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+        int fd_size, i;
+        int gotfds;
+
+        if (cmsg->cmsg_len < CMSG_LEN(sizeof(int)) ||
+            cmsg->cmsg_level != SOL_SOCKET ||
+            cmsg->cmsg_type != SCM_RIGHTS) {
+            continue;
+        }
+
+        fd_size = cmsg->cmsg_len - CMSG_LEN(0);
+
+        if (!fd_size) {
+            continue;
+        }
+
+        gotfds = fd_size / sizeof(int);
+        *fds = g_renew(int, *fds, *nfds + gotfds);
+        memcpy(*fds + *nfds, CMSG_DATA(cmsg), fd_size);
+
+        for (i = 0; i < gotfds; i++) {
+            int fd = (*fds)[*nfds + i];
+            if (fd < 0) {
+                continue;
+            }
+
+            /* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
+            qemu_set_block(fd);
+
+#ifndef MSG_CMSG_CLOEXEC
+            qemu_set_cloexec(fd);
+#endif
+        }
+        *nfds += gotfds;
+    }
+}
+
+
+static ssize_t qio_channel_socket_readv(QIOChannel *ioc,
+                                        const struct iovec *iov,
+                                        size_t niov,
+                                        int **fds,
+                                        size_t *nfds,
+                                        int flags,
+                                        Error **errp)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+    ssize_t ret;
+    struct msghdr msg = { NULL, };
+    char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)];
+    int sflags = 0;
+
+    if (flags & ~QIO_CHANNEL_READ_PEEK) {
+        error_setg_errno(errp, EINVAL,
+                         _("Flags %x are not supported"),
+                         flags & ~QIO_CHANNEL_READ_PEEK);
+        return -1;
+    }
+
+#ifdef MSG_CMSG_CLOEXEC
+    sflags |= MSG_CMSG_CLOEXEC;
+#endif
+    if (flags & QIO_CHANNEL_READ_PEEK) {
+        sflags |= MSG_PEEK;
+    }
+
+    msg.msg_iov = (struct iovec *)iov;
+    msg.msg_iovlen = niov;
+    if (fds && nfds) {
+        msg.msg_control = control;
+        msg.msg_controllen = sizeof(control);
+    }
+
+ retry:
+    ret = recvmsg(sioc->fd, &msg, sflags);
+    if (ret < 0) {
+        if (socket_error() == EAGAIN) {
+            return -2;
+        }
+        if (socket_error() == EINTR) {
+            goto retry;
+        }
+
+        error_setg_errno(errp, socket_error(), "%s",
+                         _("Unable to read from socket"));
+        return -1;
+    }
+
+    if (fds && nfds) {
+        qio_channel_socket_copy_fds(&msg, fds, nfds);
+    }
+
+    return ret;
+}
+
+static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
+                                         const struct iovec *iov,
+                                         size_t niov,
+                                         int *fds,
+                                         size_t nfds,
+                                         int flags G_GNUC_UNUSED,
+                                         Error **errp)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+    ssize_t ret;
+    struct msghdr msg = { NULL, };
+
+    if (flags) {
+        error_setg_errno(errp, EINVAL,
+                         _("Flags %x are not supported"),
+                         flags);
+        return -1;
+    }
+
+    msg.msg_iov = (struct iovec *)iov;
+    msg.msg_iovlen = niov;
+
+    if (nfds) {
+        char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)];
+        size_t fdsize = sizeof(int) * nfds;
+        struct cmsghdr *cmsg;
+
+        if (nfds > SOCKET_MAX_FDS) {
+            error_setg_errno(errp, -EINVAL,
+                             _("Only %d FDs can be sent, got %zu"),
+                             SOCKET_MAX_FDS, nfds);
+            return -1;
+        }
+
+        msg.msg_control = control;
+        msg.msg_controllen = CMSG_SPACE(sizeof(int) * nfds);
+
+        cmsg = CMSG_FIRSTHDR(&msg);
+        cmsg->cmsg_len = CMSG_LEN(fdsize);
+        cmsg->cmsg_level = SOL_SOCKET;
+        cmsg->cmsg_type = SCM_RIGHTS;
+        memcpy(CMSG_DATA(cmsg), fds, fdsize);
+    }
+
+ retry:
+    ret = sendmsg(sioc->fd, &msg, 0);
+    if (ret <= 0) {
+        if (socket_error() == EAGAIN) {
+            return -2;
+        }
+        if (socket_error() == EINTR) {
+            goto retry;
+        }
+        error_setg_errno(errp, socket_error(), "%s",
+                         _("Unable to write to socket"));
+        return -1;
+    }
+    return ret;
+}
+#else /* WIN32 */
+static ssize_t qio_channel_socket_readv(QIOChannel *ioc,
+                                        const struct iovec *iov,
+                                        size_t niov,
+                                        int **fds,
+                                        size_t *nfds,
+                                        int flags,
+                                        Error **errp)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+    ssize_t done = 0;
+    ssize_t i;
+
+    if (flags) {
+        error_setg_errno(errp, EINVAL,
+                         _("Flags %x are not supported"),
+                         flags);
+        return -1;
+    }
+    if (fds || nfds) {
+        error_setg_errno(errp, EINVAL, "%s",
+                         _("Channel does not support file descriptor passing"));
+        return -1;
+    }
+
+    for (i = 0; i < niov; i++) {
+        ssize_t ret;
+    retry:
+        ret = recv(sioc->fd,
+                   iov[i].iov_base,
+                   iov[i].iov_len,
+                   0);
+        if (ret < 0) {
+            if (socket_error() == EAGAIN) {
+                if (done) {
+                    return done;
+                } else {
+                    return QIO_CHANNEL_ERR_BLOCK;
+                }
+            } else if (socket_error() == EINTR) {
+                goto retry;
+            } else {
+                error_setg_errno(errp, socket_error(), "%s",
+                                 _("Unable to write to socket"));
+                return -1;
+            }
+        }
+        done += ret;
+        if (ret < iov[i].iov_len) {
+            return done;
+        }
+    }
+
+    return done;
+}
+
+static ssize_t qio_channel_socket_writev(QIOChannel *ioc,
+                                         const struct iovec *iov,
+                                         size_t niov,
+                                         int *fds,
+                                         size_t nfds,
+                                         int flags G_GNUC_UNUSED,
+                                         Error **errp)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+    ssize_t done = 0;
+    ssize_t i;
+
+    if (flags) {
+        error_setg_errno(errp, EINVAL,
+                         _("Flags %x are not supported"),
+                         flags);
+        return -1;
+    }
+    if (fds || nfds) {
+        error_setg_errno(errp, EINVAL, "%s",
+                         _("Channel does not support file descriptor passing"));
+        return -1;
+    }
+
+    for (i = 0; i < niov; i++) {
+        ssize_t ret;
+    retry:
+        ret = send(sioc->fd,
+                   iov[i].iov_base,
+                   iov[i].iov_len,
+                   0);
+        if (ret < 0) {
+            if (socket_error() == EAGAIN) {
+                if (done) {
+                    return done;
+                } else {
+                    return QIO_CHANNEL_ERR_BLOCK;
+                }
+            } else if (socket_error() == EINTR) {
+                goto retry;
+            } else {
+                error_setg_errno(errp, socket_error(), "%s",
+                                 _("Unable to write to socket"));
+                return -1;
+            }
+        }
+        done += ret;
+        if (ret < iov[i].iov_len) {
+            return done;
+        }
+    }
+
+    return done;
+}
+#endif /* WIN32 */
+
+static void qio_channel_socket_set_blocking(QIOChannel *ioc,
+                                            bool enabled)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+
+    if (enabled) {
+        qemu_set_block(sioc->fd);
+    } else {
+        qemu_set_nonblock(sioc->fd);
+    }
+}
+
+void
+qio_channel_socket_set_nodelay(QIOChannelSocket *ioc,
+                               bool enabled)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+    int v = enabled ? 1 : 0;
+
+    qemu_setsockopt(sioc->fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v));
+}
+
+static int qio_channel_socket_close(QIOChannel *ioc,
+                                    Error **errp)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+
+    if (closesocket(sioc->fd) < 0) {
+        sioc->fd = -1;
+        error_setg_errno(errp, socket_error(), "%s",
+                         _("Unable to close socket"));
+        return -1;
+    }
+    sioc->fd = -1;
+    return 0;
+}
+
+int
+qio_channel_socket_shutdown(QIOChannelSocket *ioc,
+                            QIOChannelSocketShutdown how,
+                            Error **errp)
+{
+    int sockhow;
+    switch (how) {
+    case QIO_CHANNEL_SOCKET_SHUTDOWN_READ:
+        sockhow = SHUT_RD;
+        break;
+    case QIO_CHANNEL_SOCKET_SHUTDOWN_WRITE:
+        sockhow = SHUT_WR;
+        break;
+    case QIO_CHANNEL_SOCKET_SHUTDOWN_BOTH:
+    default:
+        sockhow = SHUT_RDWR;
+        break;
+    }
+
+    if (shutdown(ioc->fd, sockhow) < 0) {
+        error_setg_errno(errp, socket_error(), "%s",
+                         _("Unable to shutdown socket"));
+        return -1;
+    }
+    return 0;
+}
+
+static GSource *qio_channel_socket_create_watch(QIOChannel *ioc,
+                                                GIOCondition condition)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+    return qio_channel_unix_create_fd_watch(ioc,
+                                            sioc->fd,
+                                            condition);
+}
+
+static void qio_channel_socket_class_init(ObjectClass *klass,
+                                          void *class_data G_GNUC_UNUSED)
+{
+    QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
+
+    ioc_klass->io_has_feature = qio_channel_socket_has_feature;
+    ioc_klass->io_writev = qio_channel_socket_writev;
+    ioc_klass->io_readv = qio_channel_socket_readv;
+    ioc_klass->io_set_blocking = qio_channel_socket_set_blocking;
+    ioc_klass->io_close = qio_channel_socket_close;
+    ioc_klass->io_create_watch = qio_channel_socket_create_watch;
+}
+
+static const TypeInfo qio_channel_socket_info = {
+    .parent = TYPE_QIO_CHANNEL,
+    .name = TYPE_QIO_CHANNEL_SOCKET,
+    .instance_size = sizeof(QIOChannelSocket),
+    .instance_init = qio_channel_socket_init,
+    .instance_finalize = qio_channel_socket_finalize,
+    .class_init = qio_channel_socket_class_init,
+};
+
+static void qio_channel_socket_register_types(void)
+{
+    type_register_static(&qio_channel_socket_info);
+}
+
+type_init(qio_channel_socket_register_types);
-- 
2.1.0