win32/socket: introduce qemu_socket_select() helper

This is a wrapper for WSAEventSelect, with Error handling. By default,
it will produce a warning, so callers don't have to be modified
now, and yet we can spot potential mis-use.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-Id: <20230221124802.4103554-7-marcandre.lureau@redhat.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 528c9ee..df752fc 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -180,7 +180,7 @@ static int socket_error(void)
 void qemu_socket_set_block(int fd)
 {
     unsigned long opt = 0;
-    WSAEventSelect(fd, NULL, 0);
+    qemu_socket_select(fd, NULL, 0, NULL);
     ioctlsocket(fd, FIONBIO, &opt);
 }
 
@@ -283,6 +283,21 @@ char *qemu_get_pid_name(pid_t pid)
 }
 
 
+bool qemu_socket_select(SOCKET s, WSAEVENT hEventObject,
+                        long lNetworkEvents, Error **errp)
+{
+    if (errp == NULL) {
+        errp = &error_warn;
+    }
+
+    if (WSAEventSelect(s, hEventObject, lNetworkEvents) != 0) {
+        error_setg_win32(errp, WSAGetLastError(), "failed to WSAEventSelect()");
+        return false;
+    }
+
+    return true;
+}
+
 #undef connect
 int qemu_connect_wrap(int sockfd, const struct sockaddr *addr,
                       socklen_t addrlen)