[PATCH V1 22/32] char: qio_channel_socket_accept reuse fd

[Steve Sistare <steven.sistare@oracle.com>]

From: Mark Kanda <mark.kanda@oracle.com>

Add an fd argument to qio_channel_socket_accept.  If not -1, the channel
uses that fd instead of accepting a new socket connection.  All callers
pass -1 in this patch, so no functional change.

Signed-off-by: Mark Kanda <mark.kanda@oracle.com>
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/io/channel-socket.h    |  3 ++-
 io/channel-socket.c            | 12 +++++++++---
 io/net-listener.c              |  4 ++--
 scsi/qemu-pr-helper.c          |  2 +-
 tests/qtest/tpm-emu.c          |  2 +-
 tests/test-char.c              |  2 +-
 tests/test-io-channel-socket.c |  4 ++--
 7 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/include/io/channel-socket.h b/include/io/channel-socket.h
index 777ff59..0ffc560 100644
--- a/include/io/channel-socket.h
+++ b/include/io/channel-socket.h
@@ -248,6 +248,7 @@ qio_channel_socket_get_remote_address(QIOChannelSocket *ioc,
 /**
  * qio_channel_socket_accept:
  * @ioc: the socket channel object
+ * @reuse_fd: fd to reuse; -1 otherwise
  * @errp: pointer to a NULL-initialized error object
  *
  * If the socket represents a server, then this accepts
@@ -258,7 +259,7 @@ qio_channel_socket_get_remote_address(QIOChannelSocket *ioc,
  */
 QIOChannelSocket *
 qio_channel_socket_accept(QIOChannelSocket *ioc,
-                          Error **errp);
+                          int reuse_fd, Error **errp);
 
 
 #endif /* QIO_CHANNEL_SOCKET_H */
diff --git a/io/channel-socket.c b/io/channel-socket.c
index e1b4667..dde12bf 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -352,7 +352,7 @@ void qio_channel_socket_dgram_async(QIOChannelSocket *ioc,
 
 QIOChannelSocket *
 qio_channel_socket_accept(QIOChannelSocket *ioc,
-                          Error **errp)
+                          int reuse_fd, Error **errp)
 {
     QIOChannelSocket *cioc;
 
@@ -362,8 +362,14 @@ qio_channel_socket_accept(QIOChannelSocket *ioc,
 
  retry:
     trace_qio_channel_socket_accept(ioc);
-    cioc->fd = qemu_accept(ioc->fd, (struct sockaddr *)&cioc->remoteAddr,
-                           &cioc->remoteAddrLen);
+
+    if (reuse_fd != -1) {
+        cioc->fd = reuse_fd;
+    } else {
+        cioc->fd = qemu_accept(ioc->fd, (struct sockaddr *)&cioc->remoteAddr,
+                               &cioc->remoteAddrLen);
+    }
+
     if (cioc->fd < 0) {
         if (errno == EINTR) {
             goto retry;
diff --git a/io/net-listener.c b/io/net-listener.c
index 5d8a226..bbdea1e 100644
--- a/io/net-listener.c
+++ b/io/net-listener.c
@@ -45,7 +45,7 @@ static gboolean qio_net_listener_channel_func(QIOChannel *ioc,
     QIOChannelSocket *sioc;
 
     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
-                                     NULL);
+                                     -1, NULL);
     if (!sioc) {
         return TRUE;
     }
@@ -194,7 +194,7 @@ static gboolean qio_net_listener_wait_client_func(QIOChannel *ioc,
     QIOChannelSocket *sioc;
 
     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
-                                     NULL);
+                                     -1, NULL);
     if (!sioc) {
         return TRUE;
     }
diff --git a/scsi/qemu-pr-helper.c b/scsi/qemu-pr-helper.c
index 57ad830..0e6d683 100644
--- a/scsi/qemu-pr-helper.c
+++ b/scsi/qemu-pr-helper.c
@@ -800,7 +800,7 @@ static gboolean accept_client(QIOChannel *ioc, GIOCondition cond, gpointer opaqu
     PRHelperClient *prh;
 
     cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
-                                     NULL);
+                                     -1, NULL);
     if (!cioc) {
         return TRUE;
     }
diff --git a/tests/qtest/tpm-emu.c b/tests/qtest/tpm-emu.c
index 2e8eb7b..19e5dab 100644
--- a/tests/qtest/tpm-emu.c
+++ b/tests/qtest/tpm-emu.c
@@ -83,7 +83,7 @@ void *tpm_emu_ctrl_thread(void *data)
     g_cond_signal(&s->data_cond);
 
     qio_channel_wait(QIO_CHANNEL(lioc), G_IO_IN);
-    ioc = QIO_CHANNEL(qio_channel_socket_accept(lioc, &error_abort));
+    ioc = QIO_CHANNEL(qio_channel_socket_accept(lioc, -1, &error_abort));
     g_assert(ioc);
 
     {
diff --git a/tests/test-char.c b/tests/test-char.c
index 614bdac..1bb6ae0 100644
--- a/tests/test-char.c
+++ b/tests/test-char.c
@@ -884,7 +884,7 @@ char_socket_client_server_thread(gpointer data)
     QIOChannelSocket *cioc;
 
 retry:
-    cioc = qio_channel_socket_accept(ioc, &error_abort);
+    cioc = qio_channel_socket_accept(ioc, -1, &error_abort);
     g_assert_nonnull(cioc);
 
     if (char_socket_ping_pong(QIO_CHANNEL(cioc), NULL) != 0) {
diff --git a/tests/test-io-channel-socket.c b/tests/test-io-channel-socket.c
index d43083a..0d410cf 100644
--- a/tests/test-io-channel-socket.c
+++ b/tests/test-io-channel-socket.c
@@ -75,7 +75,7 @@ static void test_io_channel_setup_sync(SocketAddress *listen_addr,
     qio_channel_set_delay(*src, false);
 
     qio_channel_wait(QIO_CHANNEL(lioc), G_IO_IN);
-    *dst = QIO_CHANNEL(qio_channel_socket_accept(lioc, &error_abort));
+    *dst = QIO_CHANNEL(qio_channel_socket_accept(lioc, -1, &error_abort));
     g_assert(*dst);
 
     test_io_channel_set_socket_bufs(*src, *dst);
@@ -143,7 +143,7 @@ static void test_io_channel_setup_async(SocketAddress *listen_addr,
     g_assert(!data.err);
 
     qio_channel_wait(QIO_CHANNEL(lioc), G_IO_IN);
-    *dst = QIO_CHANNEL(qio_channel_socket_accept(lioc, &error_abort));
+    *dst = QIO_CHANNEL(qio_channel_socket_accept(lioc, -1, &error_abort));
     g_assert(*dst);
 
     qio_channel_set_delay(*src, false);
-- 
1.8.3.1