tests: Add gsocketclient test for slow connections

gio/tests/slow-connect-preload.c

@@ -0,0 +1,43 @@
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright (C) 2018 Igalia S.L.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <dlfcn.h>
+
+/* This is used in gsocketclient-slow.c used to test
+ * and get coverage on how GSocketClient reacts to
+ * slow connections.
+ */
+int
+connect (int                    sockfd,
+         const struct sockaddr *addr,
+         socklen_t              addrlen)
+{
+  static int (*real_connect)(int, const struct sockaddr *, socklen_t);
+
+  if (real_connect == NULL)
+    real_connect = dlsym (RTLD_NEXT, "connect");
+
+  /* This is long enough for multiple connection attempts to be done
+   * in parallel given that their timeout is 250ms */
+  usleep (600 * 1000);
+  return real_connect (sockfd, addr, addrlen);
+}