[Qemu-devel] [PATCH v2 3/3] socket: unlink unix socket on remove

[marcandre.lureau@redhat.com]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

qemu leaves unix socket files behind when removing a listening chardev
or leaving. qemu could clean that up, even if doing so isn't race-free.

Fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=1347077

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 include/qemu/sockets.h         |  1 +
 io/channel-socket.c            | 10 ++++++++++
 tests/test-io-channel-socket.c |  2 +-
 util/qemu-sockets.c            | 18 ++++++++++++++++++
 4 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
index 1bd9218..5dd2648 100644
--- a/include/qemu/sockets.h
+++ b/include/qemu/sockets.h
@@ -51,6 +51,7 @@ SocketAddress *socket_parse(const char *str, Error **errp);
 int socket_connect(SocketAddress *addr, Error **errp,
                    NonBlockingConnectHandler *callback, void *opaque);
 int socket_listen(SocketAddress *addr, Error **errp);
+void socket_listen_cleanup(int fd, Error **errp);
 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp);
 
 /* Old, ipv4 only bits.  Don't use for new code. */
diff --git a/io/channel-socket.c b/io/channel-socket.c
index 1cd5848..6ec87f8 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -400,7 +400,17 @@ static void qio_channel_socket_init(Object *obj)
 static void qio_channel_socket_finalize(Object *obj)
 {
     QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
+
     if (ioc->fd != -1) {
+        if (QIO_CHANNEL(ioc)->features & QIO_CHANNEL_FEATURE_LISTEN) {
+            Error *err = NULL;
+
+            socket_listen_cleanup(ioc->fd, &err);
+            if (err) {
+                error_report_err(err);
+                err = NULL;
+            }
+        }
 #ifdef WIN32
         WSAEventSelect(ioc->fd, NULL, 0);
 #endif
diff --git a/tests/test-io-channel-socket.c b/tests/test-io-channel-socket.c
index 855306b..f73e063 100644
--- a/tests/test-io-channel-socket.c
+++ b/tests/test-io-channel-socket.c
@@ -383,7 +383,7 @@ static void test_io_channel_unix(bool async)
 
     qapi_free_SocketAddress(listen_addr);
     qapi_free_SocketAddress(connect_addr);
-    unlink(TEST_SOCKET);
+    g_assert(g_file_test(TEST_SOCKET, G_FILE_TEST_EXISTS) == FALSE);
 }
 
 
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 0d6cd1f..5d03695 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -997,6 +997,24 @@ int socket_listen(SocketAddress *addr, Error **errp)
     return fd;
 }
 
+void socket_listen_cleanup(int fd, Error **errp)
+{
+    SocketAddress *addr;
+
+    addr = socket_local_address(fd, errp);
+
+    if (addr->type == SOCKET_ADDRESS_KIND_UNIX
+        && addr->u.q_unix.data->path) {
+        if (unlink(addr->u.q_unix.data->path) < 0 && errno != ENOENT) {
+            error_setg_errno(errp, errno,
+                             "Failed to unlink socket %s",
+                             addr->u.q_unix.data->path);
+        }
+    }
+
+    g_free(addr);
+}
+
 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
 {
     int fd;
-- 
2.7.4