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diff --git a/src/util/syscall_sandbox.h b/src/util/syscall_sandbox.h
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+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_SYSCALL_SANDBOX_H
+#define BITCOIN_UTIL_SYSCALL_SANDBOX_H
+
+enum class SyscallSandboxPolicy {
+    // 1. Initialization
+    INITIALIZATION,
+    INITIALIZATION_DNS_SEED,
+    INITIALIZATION_LOAD_BLOCKS,
+    INITIALIZATION_MAP_PORT,
+
+    // 2. Steady state (non-initialization, non-shutdown)
+    MESSAGE_HANDLER,
+    NET,
+    NET_ADD_CONNECTION,
+    NET_HTTP_SERVER,
+    NET_HTTP_SERVER_WORKER,
+    NET_OPEN_CONNECTION,
+    SCHEDULER,
+    TOR_CONTROL,
+    TX_INDEX,
+    VALIDATION_SCRIPT_CHECK,
+
+    // 3. Shutdown
+    SHUTOFF,
+};
+
+//! Force the current thread (and threads created from the current thread) into a restricted-service
+//! operating mode where only a subset of all syscalls are available.
+//!
+//! Subsequent calls to this function can reduce the abilities further, but abilities can never be
+//! regained.
+//!
+//! This function is a no-op unless SetupSyscallSandbox(...) has been called.
+//!
+//! SetupSyscallSandbox(...) is called during bitcoind initialization if Bitcoin Core was compiled
+//! with seccomp-bpf support (--with-seccomp) *and* the parameter -sandbox=<mode> was passed to
+//! bitcoind.
+//!
+//! This experimental feature is available under Linux x86_64 only.
+void SetSyscallSandboxPolicy(SyscallSandboxPolicy syscall_policy);
+
+#if defined(USE_SYSCALL_SANDBOX)
+//! Setup and enable the experimental syscall sandbox for the running process.
+//!
+//! SetSyscallSandboxPolicy(SyscallSandboxPolicy::INITIALIZATION) is called as part of
+//! SetupSyscallSandbox(...).
+[[nodiscard]] bool SetupSyscallSandbox(bool log_syscall_violation_before_terminating);
+
+//! Invoke a disallowed syscall. Use for testing purposes.
+void TestDisallowedSandboxCall();
+#endif // defined(USE_SYSCALL_SANDBOX)
+
+#endif // BITCOIN_UTIL_SYSCALL_SANDBOX_H