Fix ProcessUtilTest.FDRemapping hang on x86_64 by counting open fds in child ...

base/process_util_unittest.cc

 // Copyright (c) 2009 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.
 
 #define _CRT_SECURE_NO_WARNINGS
 
 #include "base/command_line.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_path.h"
 #include "base/multiprocess_test.h"
@@ skipping 180 matching lines @@
 
 const int kChildPipe = 20;  // FD # for write end of pipe in child process.
 MULTIPROCESS_TEST_MAIN(ProcessUtilsLeakFDChildProcess) {
   // This child process counts the number of open FDs, it then writes that
   // number out to a pipe connected to the parent.
   int num_open_files = 0;
   int write_pipe = kChildPipe;
   int max_files = GetMaxFilesOpenInProcess();
   for (int i = STDERR_FILENO + 1; i < max_files; i++) {
     if (i != kChildPipe) {
-      if (HANDLE_EINTR(close(i)) != -1) {
+      int fd;
+      if ((fd = HANDLE_EINTR(dup(i))) != -1) {
+        close(fd);
         num_open_files += 1;
       }
     }
   }
 
   int written = HANDLE_EINTR(write(write_pipe, &num_open_files,
                                    sizeof(num_open_files)));
   DCHECK_EQ(static_cast<size_t>(written), sizeof(num_open_files));
   HANDLE_EINTR(close(write_pipe));
 
@@ skipping 82 matching lines @@
       "16 0 1 0 1676099790 2957312 114 4294967295 134512640 134528148 "
       "3221224832 3221224344 3086339742 0 0 0 0 0 0 0 17 0 0 0";
 
   EXPECT_EQ(0, ParseProcStatCPU(kSelfStat));
 }
 #endif
 
 #endif  // defined(OS_POSIX)
 
 }  // namespace base