You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
52 lines
1.4 KiB
52 lines
1.4 KiB
// 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 "ipc/ipc_channel.h"
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include <limits>
|
|
|
|
#include "base/atomic_sequence_num.h"
|
|
#include "base/rand_util.h"
|
|
#include "base/strings/stringprintf.h"
|
|
#include "build/build_config.h"
|
|
|
|
namespace {
|
|
|
|
// Global atomic used to guarantee channel IDs are unique.
|
|
base::AtomicSequenceNumber g_last_id;
|
|
|
|
} // namespace
|
|
|
|
namespace IPC {
|
|
|
|
// static
|
|
constexpr size_t Channel::kMaximumMessageSize;
|
|
|
|
// static
|
|
std::string Channel::GenerateUniqueRandomChannelID() {
|
|
// Note: the string must start with the current process id, this is how
|
|
// some child processes determine the pid of the parent.
|
|
//
|
|
// This is composed of a unique incremental identifier, the process ID of
|
|
// the creator, an identifier for the child instance, and a strong random
|
|
// component. The strong random component prevents other processes from
|
|
// hijacking or squatting on predictable channel names.
|
|
#if defined(OS_NACL_NONSFI)
|
|
// The seccomp sandbox disallows use of getpid(), so we provide a
|
|
// dummy PID.
|
|
int process_id = -1;
|
|
#else
|
|
int process_id = base::GetCurrentProcId();
|
|
#endif
|
|
return base::StringPrintf("%d.%u.%d",
|
|
process_id,
|
|
g_last_id.GetNext(),
|
|
base::RandInt(0, std::numeric_limits<int32_t>::max()));
|
|
}
|
|
|
|
} // namespace IPC
|