Added O_CLOEXEC to the flags parameter of open() calls

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 09138cff1626fb4392bdeaa4652e06366e157412..fccd648d5cab8c8f9e15fa5c8fe023c156d378e4 100644
--- a/runtime/bin/file_macos.cc
+++ b/runtime/bin/file_macos.cc
@@ -116,6 +116,7 @@ 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;
@@ -147,7 +148,7 @@ bool File::Exists(const char* name) {
 
 
 bool File::Create(const char* name) {
-  int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CREAT, 0666));
+  int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CREAT | O_CLOEXEC, 0666));
   if (fd < 0) {
     return false;
   }