Fixed missing O_CLOEXEC in Mac OS

runtime/bin/file_macos.cc

Index: runtime/bin/file_macos.cc
diff --git a/runtime/bin/file_macos.cc b/runtime/bin/file_macos.cc
index fccd648d5cab8c8f9e15fa5c8fe023c156d378e4..b5bc95a9c43c7c217aa56329e5c37f4be6d581a8 100644
--- a/runtime/bin/file_macos.cc
+++ b/runtime/bin/file_macos.cc
@@ -12,6 +12,7 @@
 #include <limits.h>
 
 #include "bin/builtin.h"
+#include "bin/fdutils.h"
 
 class FileHandle {
  public:
@@ -116,11 +117,11 @@ File* File::Open(const char* name, FileOpenMode mode) {
   if ((mode & kTruncate) != 0) {
     flags = flags | O_TRUNC;
   }
-  flags |= O_CLOEXEC;
   int fd = TEMP_FAILURE_RETRY(open(name, flags, 0666));
   if (fd < 0) {
     return NULL;
   }
+  FDUtils::SetCloseOnExec(fd);
   if (((mode & kWrite) != 0) && ((mode & kTruncate) == 0)) {
     int position = TEMP_FAILURE_RETRY(lseek(fd, 0, SEEK_END));
     if (position < 0) {
@@ -148,7 +149,7 @@ bool File::Exists(const char* name) {
 
 
 bool File::Create(const char* name) {
-  int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CREAT | O_CLOEXEC, 0666));
+  int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CREAT, 0666));
   if (fd < 0) {
     return false;
   }