Don't wait for the http server forever.

subprocess_unittest.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <string>
 #include <vector>
 #include "base/string_util.h"
 #include <glib.h>
@@ skipping 48 matching lines @@
 
 gboolean StartAndCancelInRunLoop(gpointer data) {
   CancelTestData* cancel_test_data = reinterpret_cast<CancelTestData*>(data);
   vector<string> cmd;
   cmd.push_back("./test_http_server");
   uint32_t tag = Subprocess::Get().Exec(cmd, CallbackBad, NULL);
   EXPECT_NE(0, tag);
   cancel_test_data->spawned = true;
   printf("spawned\n");
   // Wait for server to be up and running
+  useconds_t total_wait_time = 0;
+  const useconds_t kMaxWaitTime = 3 * 1000000;  // 3 seconds
   for (;;) {
     int status =
         System(StringPrintf("wget -O /dev/null http://127.0.0.1:%d/foo",
                             kLocalHttpPort));
     EXPECT_NE(-1, status) << "system() failed";
     EXPECT_TRUE(WIFEXITED(status))
         << "command failed to run or died abnormally";
     if (0 == WEXITSTATUS(status))
       break;
-    usleep(100 * 1000);  // 100 ms
+
+    const useconds_t kSleepTime = 100 * 1000;  // 100ms
+    usleep(kSleepTime);  // 100 ms
+    total_wait_time += kSleepTime;
+    CHECK_LT(total_wait_time, kMaxWaitTime);
   }
   Subprocess::Get().CancelExec(tag);
   return FALSE;
 }
 }  // namespace {}
 
 gboolean ExitWhenDone(gpointer data) {
   CancelTestData* cancel_test_data = reinterpret_cast<CancelTestData*>(data);
   if (cancel_test_data->spawned && !Subprocess::Get().SubprocessInFlight()) {
     // tear down the sub process
@@ skipping 16 matching lines @@
   cancel_test_data.spawned = false;
   cancel_test_data.loop = loop;
   g_timeout_add(100, &StartAndCancelInRunLoop, &cancel_test_data);
   g_timeout_add(10, &ExitWhenDone, &cancel_test_data);
   g_main_loop_run(loop);
   g_main_loop_unref(loop);
   printf("here\n");
 }
 
 }  // namespace chromeos_update_engine