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// Copyright (c) 2012 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/files/file.h"
#include "base/process/launch.h"
namespace content {
// FileDescriptorInfo is a collection of file descriptors which is
// needed to launch a process. You should tell FileDescriptorInfo
// which FD should be closed and which shouldn't so that it can take care
// of the lifetime of FDs.
// See base/process/launcher.h for more details about launching a
// process.
class FileDescriptorInfo {
virtual ~FileDescriptorInfo() {}
// Add an FD associated with an ID, without delegating the ownerhip
// of ID.
virtual void Share(int id, base::PlatformFile fd) = 0;
// Add an FD associated with an ID, passing the FD ownership to
// FileDescriptorInfo.
virtual void Transfer(int id, base::ScopedFD fd) = 0;
// A vecotr backed map of registered ID-FD pairs.
virtual const base::FileHandleMappingVector& GetMapping() const = 0;
// A GetMapping() variant what adjusts the ID value by |delta|.
// Some environments need this trick.
virtual base::FileHandleMappingVector GetMappingWithIDAdjustment(
int delta) const = 0;
// API for iterating registered ID-FD pairs.
virtual base::PlatformFile GetFDAt(size_t i) const = 0;
virtual int GetIDAt(size_t i) const = 0;
virtual size_t GetMappingSize() const = 0;
// True if |this| has an ownership of |file|.
virtual bool OwnsFD(base::PlatformFile file) const = 0;
// Assuming |OwnsFD(file)|, release the ownership.
virtual base::ScopedFD ReleaseFD(base::PlatformFile file) = 0;