Use non-blocking sockets for client communication

This approach is better than using blocking sockets and select() since
there's no guarantee that send() doesn't block. Plus we're using poll()
anyway so send() and recv() will only be called if the socket is actually
ready for writing/reading.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index b1f4eeb..2e4439c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -82,6 +82,15 @@ static int create_socket(void) {
 		return -1;
 	}
 
+	int flags = fcntl(listenfd, F_GETFL, 0);
+	if (flags < 0) {
+		usbmuxd_log(LL_FATAL, "ERROR: Could not get flags for socket");
+	} else {
+		if (fcntl(listenfd, F_SETFL, flags | O_NONBLOCK) < 0) {
+			usbmuxd_log(LL_FATAL, "ERROR: Could not set socket to non-blocking");
+		}
+	}
+
 	bzero(&bind_addr, sizeof(bind_addr));
 	bind_addr.sun_family = AF_UNIX;
 	strcpy(bind_addr.sun_path, socket_path);