posix: Add ScopedDIR for managing open directories

Change-Id: I9f1453db5e33e714c12ebeaaab25813a2b099de8
Reviewed-on: https://chromium-review.googlesource.com/468271
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>

util/posix/close_multiple.cc

@@ -24,7 +24,6 @@
 #include <unistd.h>
 
 #include <algorithm>
-#include <memory>
 
 #include "base/files/scoped_file.h"
 #include "base/logging.h"
@@ -32,6 +31,7 @@
 #include "build/build_config.h"
 #include "util/misc/implicit_cast.h"
 #include "util/numeric/safe_assignment.h"
+#include "util/posix/scoped_dir.h"
 
 #if defined(OS_MACOSX)
 #include <sys/sysctl.h>
@@ -69,18 +69,6 @@ void CloseNowOrOnExec(int fd, bool ebadf_ok) {
   }
 }
 
-struct ScopedDIRCloser {
-  void operator()(DIR* dir) const {
-    if (dir) {
-      if (closedir(dir) < 0) {
-        PLOG(ERROR) << "closedir";
-      }
-    }
-  }
-};
-
-using ScopedDIR = std::unique_ptr<DIR, ScopedDIRCloser>;
-
 // This function implements CloseMultipleNowOrOnExec() using an operating
 // system-specific FD directory to determine which file descriptors are open.
 // This is an advantage over looping over all possible file descriptors, because

util/posix/scoped_dir.cc

@@ -0,0 +1,30 @@
+// Copyright 2017 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/posix/scoped_dir.h"
+
+#include "base/logging.h"
+#include "base/posix/eintr_wrapper.h"
+
+namespace crashpad {
+namespace internal {
+
+void ScopedDIRCloser::operator()(DIR* dir) const {
+  if (dir && IGNORE_EINTR(closedir(dir)) != 0) {
+    PLOG(ERROR) << "closedir";
+  }
+}
+
+}  // namespace internal
+}  // namespace crashpad

util/posix/scoped_dir.h

@@ -0,0 +1,38 @@
+// Copyright 2017 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_POSIX_SCOPED_DIR_H_
+#define CRASHPAD_UTIL_POSIX_SCOPED_DIR_H_
+
+#include <dirent.h>
+
+#include <memory>
+
+namespace crashpad {
+namespace internal {
+
+struct ScopedDIRCloser {
+  void operator()(DIR* dir) const;
+};
+
+}  // namespace internal
+
+//! \brief Maintains a directory opened by `opendir`.
+//!
+//! On destruction, the directory will be closed by calling `closedir`.
+using ScopedDIR = std::unique_ptr<DIR, internal::ScopedDIRCloser>;
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_POSIX_SCOPED_DIR_H_

util/util.gyp

@@ -146,6 +146,8 @@
         'posix/process_info.h',
         'posix/process_info_linux.cc',
         'posix/process_info_mac.cc',
+        'posix/scoped_dir.cc',
+        'posix/scoped_dir.h',
         'posix/scoped_mmap.cc',
         'posix/scoped_mmap.h',
         'posix/signals.cc',