Enforce handle ownership in base::Process

base/process/process_linux.cc

 // Copyright (c) 2011 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 "base/process/process.h"
 
 #include <errno.h>
 #include <sys/resource.h>
 
 #include "base/files/file_util.h"
@@ skipping 116 matching lines @@
 #if defined(OS_CHROMEOS)
   if (cgroups.Get().enabled)
     return true;
 #endif
 
   static LazyInstance<CheckForNicePermission> check_for_nice_permission =
       LAZY_INSTANCE_INITIALIZER;
   return check_for_nice_permission.Get().can_reraise_priority;
 }
 
+// TODO(rvargas) crbug.com/417532: Remove Process::*
+// -----------------------------------------------------------------------------
+
+// static
+bool ProcessObject::CanBackgroundProcesses() {
+#if defined(OS_CHROMEOS)
+  if (cgroups.Get().enabled)
+    return true;
+#endif
+
+  static LazyInstance<CheckForNicePermission> check_for_nice_permission =
+      LAZY_INSTANCE_INITIALIZER;
+  return check_for_nice_permission.Get().can_reraise_priority;
+}
+
+bool ProcessObject::IsProcessBackgrounded() const {
+  DCHECK(IsValid());
+
+#if defined(OS_CHROMEOS)
+  if (cgroups.Get().enabled) {
+    std::string proc;
+    if (base::ReadFileToString(
+            base::FilePath(StringPrintf(kProcPath, process_)),
+            &proc)) {
+      std::vector<std::string> proc_parts;
+      base::SplitString(proc, ':', &proc_parts);
+      DCHECK(proc_parts.size() == 3);
+      bool ret = proc_parts[2] == std::string(kBackground);
+      return ret;
+    } else {
+      return false;
+    }
+  }
+#endif
+  return GetPriority() == kBackgroundPriority;
+}
+
+bool ProcessObject::SetProcessBackgrounded(bool background) {
+  DCHECK(IsValid());
+
+#if defined(OS_CHROMEOS)
+  if (cgroups.Get().enabled) {
+    std::string pid = StringPrintf("%d", process_);
+    const base::FilePath file =
+        background ?
+            cgroups.Get().background_file : cgroups.Get().foreground_file;
+    return base::WriteFile(file, pid.c_str(), pid.size()) > 0;
+  }
+#endif // OS_CHROMEOS
+
+  if (!CanBackgroundProcesses())
+    return false;
+
+  int priority = background ? kBackgroundPriority : kForegroundPriority;
+  int result = setpriority(PRIO_PROCESS, process_, priority);
+  DPCHECK(result == 0);
+  return result == 0;
+}
+
 }  // namespace base