posix: better launchapp error message

base/process_util_posix.cc

 // Copyright (c) 2006-2008 The Chromium 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 <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/resource.h>
@@ skipping 256 matching lines @@
     // off chance that it's already set.
     unsetenv("SBX_D");
 
     CloseSuperfluousFds(fd_shuffle);
 
     scoped_array<char*> argv_cstr(new char*[argv.size() + 1]);
     for (size_t i = 0; i < argv.size(); i++)
       argv_cstr[i] = const_cast<char*>(argv[i].c_str());
     argv_cstr[argv.size()] = NULL;
     execvp(argv_cstr[0], argv_cstr.get());
-    LOG(ERROR) << "LaunchApp: exec failed!, argv_cstr[0] " << argv_cstr[0]
-        << ", errno " << errno;
+    LOG(ERROR) << "LaunchApp: execvp(" << argv_cstr[0] << ") failed: "
+               << strerror(errno);
     _exit(127);
   } else {
     // Parent process
     if (wait)
       HANDLE_EINTR(waitpid(pid, 0, 0));
 
     if (process_handle)
       *process_handle = pid;
   }
 
@@ skipping 346 matching lines @@
                       const ProcessFilter* filter) {
   bool exited_cleanly =
       WaitForProcessesToExit(executable_name, wait_milliseconds,
                              filter);
   if (!exited_cleanly)
     KillProcesses(executable_name, exit_code, filter);
   return exited_cleanly;
 }
 
 }  // namespace base