[PATCH v2] server: add log message when client connection is destroyed due to an error

[Mathias Fiedler]

The client connection is destroyed by the server in several
circumstances. This patch adds log messages in case the connection is
destroyed due to an error other than normal hangup.

Signed-off-by: Mathias Fiedler <mathias_fiedler at mentor.com>
---
 src/wayland-server.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/src/wayland-server.c b/src/wayland-server.c
index 82a3b01..ebdd695 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -300,6 +300,13 @@ wl_resource_post_error(struct wl_resource *resource,
 	client->error = 1;
 }
 
+static void
+destroy_client_with_error(struct wl_client *client, const char *reason)
+{
+	wl_log("%s (pid %u)\n", reason, client->ucred.pid);
+	wl_client_destroy(client);
+}
+
 static int
 wl_client_connection_data(int fd, uint32_t mask, void *data)
 {
@@ -314,15 +321,21 @@ wl_client_connection_data(int fd, uint32_t mask, void *data)
 	int opcode, size, since;
 	int len;
 
-	if (mask & (WL_EVENT_ERROR | WL_EVENT_HANGUP)) {
+	if (mask & WL_EVENT_HANGUP) {
 		wl_client_destroy(client);
 		return 1;
 	}
 
+	if (mask & WL_EVENT_ERROR) {
+		destroy_client_with_error(client, "socket error");
+		return 1;
+	}
+
 	if (mask & WL_EVENT_WRITABLE) {
 		len = wl_connection_flush(connection);
 		if (len < 0 && errno != EAGAIN) {
-			wl_client_destroy(client);
+			destroy_client_with_error(
+			    client, "failed to flush client connection");
 			return 1;
 		} else if (len >= 0) {
 			wl_event_source_fd_update(client->source,
@@ -334,7 +347,8 @@ wl_client_connection_data(int fd, uint32_t mask, void *data)
 	if (mask & WL_EVENT_READABLE) {
 		len = wl_connection_read(connection);
 		if (len == 0 || (len < 0 && errno != EAGAIN)) {
-			wl_client_destroy(client);
+			destroy_client_with_error(
+			    client, "failed to read client connection");
 			return 1;
 		}
 	}
@@ -418,8 +432,10 @@ wl_client_connection_data(int fd, uint32_t mask, void *data)
 		len = wl_connection_pending_input(connection);
 	}
 
-	if (client->error)
-		wl_client_destroy(client);
+	if (client->error) {
+		destroy_client_with_error(client,
+					  "error in client communication");
+	}
 
 	return 1;
 }
-- 
2.7.4