[PATCH 2/5] io/channel.c,io/channel-socket.c: Add yank feature

[Lukas Straub <lukasstraub2@web.de>]

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Add qio_channel_set_yank function to channel and to channel-socket,
which will register a yank function. The yank function calls
shutdown() on the socket.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
---
 Makefile.objs               |  1 +
 include/io/channel-socket.h |  1 +
 include/io/channel.h        | 12 ++++++++++++
 io/channel-socket.c         | 29 +++++++++++++++++++++++++++++
 io/channel.c                |  9 +++++++++
 5 files changed, 52 insertions(+)

diff --git a/Makefile.objs b/Makefile.objs
index a7c967633a..889115775c 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -24,6 +24,7 @@ block-obj-m = block/
 crypto-obj-y = crypto/
 
 io-obj-y = io/
+io-obj-y += yank.o
 
 endif # CONFIG_SOFTMMU or CONFIG_TOOLS
 
diff --git a/include/io/channel-socket.h b/include/io/channel-socket.h
index 777ff5954e..0fa7a364f3 100644
--- a/include/io/channel-socket.h
+++ b/include/io/channel-socket.h
@@ -48,6 +48,7 @@ struct QIOChannelSocket {
     socklen_t localAddrLen;
     struct sockaddr_storage remoteAddr;
     socklen_t remoteAddrLen;
+    bool yank;
 };
 
 
diff --git a/include/io/channel.h b/include/io/channel.h
index d4557f0930..782b618694 100644
--- a/include/io/channel.h
+++ b/include/io/channel.h
@@ -132,6 +132,8 @@ struct QIOChannelClass {
                         bool enabled);
     void (*io_set_delay)(QIOChannel *ioc,
                          bool enabled);
+    void (*io_set_yank)(QIOChannel *ioc,
+                        bool enabled);
     off_t (*io_seek)(QIOChannel *ioc,
                      off_t offset,
                      int whence,
@@ -550,6 +552,16 @@ int qio_channel_shutdown(QIOChannel *ioc,
 void qio_channel_set_delay(QIOChannel *ioc,
                            bool enabled);
 
+/**
+ * qio_channel_set_yank:
+ * @ioc: the channel object
+ * @enabled: the new flag state
+ *
+ * Controls wether this channel participates in yanking.
+ */
+void qio_channel_set_yank(QIOChannel *ioc,
+                          bool enabled);
+
 /**
  * qio_channel_set_cork:
  * @ioc: the channel object
diff --git a/io/channel-socket.c b/io/channel-socket.c
index b74f5b92a0..be03946d29 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -26,6 +26,7 @@
 #include "io/channel-watch.h"
 #include "trace.h"
 #include "qapi/clone-visitor.h"
+#include "yank.h"
 
 #define SOCKET_MAX_FDS 16
 
@@ -55,6 +56,7 @@ qio_channel_socket_new(void)
 
     sioc = QIO_CHANNEL_SOCKET(object_new(TYPE_QIO_CHANNEL_SOCKET));
     sioc->fd = -1;
+    sioc->yank = 0;
 
     ioc = QIO_CHANNEL(sioc);
     qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
@@ -395,10 +397,19 @@ qio_channel_socket_accept(QIOChannelSocket *ioc,
     return NULL;
 }
 
+static void qio_channel_socket_yank(void *opaque)
+{
+    QIOChannel *ioc = opaque;
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+
+    shutdown(sioc->fd, SHUT_RDWR);
+}
+
 static void qio_channel_socket_init(Object *obj)
 {
     QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
     ioc->fd = -1;
+    ioc->yank = 0;
 }
 
 static void qio_channel_socket_finalize(Object *obj)
@@ -422,6 +433,9 @@ static void qio_channel_socket_finalize(Object *obj)
         closesocket(ioc->fd);
         ioc->fd = -1;
     }
+    if (ioc->yank) {
+        yank_unregister_function(qio_channel_socket_yank, ioc);
+    }
 }
 
 
@@ -686,6 +700,20 @@ qio_channel_socket_set_delay(QIOChannel *ioc,
                     &v, sizeof(v));
 }
 
+static void
+qio_channel_socket_set_yank(QIOChannel *ioc,
+                            bool enabled)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
+
+    if (sioc->yank) {
+        yank_unregister_function(qio_channel_socket_yank, ioc);
+    }
+    sioc->yank = enabled;
+    if (sioc->yank) {
+        yank_register_function(qio_channel_socket_yank, ioc);
+    }
+}
 
 static void
 qio_channel_socket_set_cork(QIOChannel *ioc,
@@ -784,6 +812,7 @@ static void qio_channel_socket_class_init(ObjectClass *klass,
     ioc_klass->io_shutdown = qio_channel_socket_shutdown;
     ioc_klass->io_set_cork = qio_channel_socket_set_cork;
     ioc_klass->io_set_delay = qio_channel_socket_set_delay;
+    ioc_klass->io_set_yank = qio_channel_socket_set_yank;
     ioc_klass->io_create_watch = qio_channel_socket_create_watch;
     ioc_klass->io_set_aio_fd_handler = qio_channel_socket_set_aio_fd_handler;
 }
diff --git a/io/channel.c b/io/channel.c
index e4376eb0bc..0c4095e0e0 100644
--- a/io/channel.c
+++ b/io/channel.c
@@ -373,6 +373,15 @@ void qio_channel_set_delay(QIOChannel *ioc,
     }
 }
 
+void qio_channel_set_yank(QIOChannel *ioc,
+                          bool enabled)
+{
+    QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc);
+
+    if (klass->io_set_yank) {
+        klass->io_set_yank(ioc, enabled);
+    }
+}
 
 void qio_channel_set_cork(QIOChannel *ioc,
                           bool enabled)
-- 
2.20.1


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