Refactor the setuid sandbox client code to its own class.

sandbox/linux/suid/common/sandbox.h

+// 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.
+
+#ifndef SANDBOX_LINUX_SUID_SANDBOX_H_
+#define SANDBOX_LINUX_SUID_SANDBOX_H_
+
+#if defined(__cplusplus)
+namespace sandbox {
+#endif
+
+// These are command line switches that may be used by other programs
+// (e.g. Chrome) to construct a command line for the sandbox.
+static const char kAdjustOOMScoreSwitch[] = "--adjust-oom-score";
+#if defined(OS_CHROMEOS)
+static const char kAdjustLowMemMarginSwitch[] = "--adjust-low-mem";
+#endif
+
+static const char kSandboxDescriptorEnvironmentVarName[] = "SBX_D";
+static const char kSandboxHelperPidEnvironmentVarName[] = "SBX_HELPER_PID";
+
+static const long kSUIDSandboxApiNumber = 1;
+static const char kSandboxEnvironmentApiRequest[] = "SBX_CHROME_API_RQ";
+static const char kSandboxEnvironmentApiProvides[] = "SBX_CHROME_API_PRV";
+
+// This number must be kept in sync with common/zygote_commands_linux.h
+static const int kZygoteIdFd = 7;
+
+// These are the magic byte values which the sandboxed process uses to request
+// that it be chrooted.
+static const char kMsgChrootMe = 'C';
+static const char kMsgChrootSuccessful = 'O';
+
+// These are set if we have respectively switched to a new PID or NET namespace
+// by going through the setuid binary helper.
+static const char kSandboxPIDNSEnvironmentVarName[] = "SBX_PID_NS";
+static const char kSandboxNETNSEnvironmentVarName[] = "SBX_NET_NS";
+
+#if defined(__cplusplus)
+}  // namespace sandbox
+#endif
+
+#endif  // SANDBOX_LINUX_SUID_SANDBOX_H_