Merge #18677: Multiprocess build support

e2bab2aa162ae38b2bf8195b577c982402fbee9d multiprocess: add multiprocess travis configuration (Russell Yanofsky) 603fd6a2e708c04ef6c9880f89d0a4cbaa6fc7c5 depends: add MULTIPROCESS depends option (Russell Yanofsky) 5d1377b52bfcd4edf8553aaf332bfeb92fc554cc build: multiprocess autotools changes (Russell Yanofsky) Pull request description: This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10). --- This PR consists of build changes only. It adds an `--enable-multiprocess` autoconf option (off by default and marked experimental), that builds new `bitcoin-node` and `bitcoin-gui` binaries. These currently function the same as existing `bitcoind` and `bitcoin-qt` binaries, but are extended in #10102 with IPC features to execute node, wallet, and gui functions in separate processes. In addition to adding the `--enable-multiprocess` config flag, it also adds a depends package and autoconf rules to build with the [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) library, and it adds new travis configuration to exercise the build code and run functional tests with the new binaries. The changes in this PR were originally part of #10102 but were moved into #16367 to be able to develop and review the multiprocess build changes independently of the code changes. #16367 was briefly merged and then reverted in #18588. Only change since #16367 has been dropping the `native_boost.mk` depends package which was pointed out to be no longer necessary in https://github.com/bitcoin/bitcoin/pull/16367#issuecomment-596484337 and https://github.com/bitcoin/bitcoin/pull/18588#pullrequestreview-391765649 ACKs for top commit: practicalswift: ACK e2bab2aa162ae38b2bf8195b577c982402fbee9d Sjors: tACK e2bab2aa162ae38b2bf8195b577c982402fbee9d on macOS 10.15.4 hebasto: ACK e2bab2aa162ae38b2bf8195b577c982402fbee9d, tested on Linux Mint 19.3 (x86_64): Tree-SHA512: b5a76eab5abf63d9d8b6d628cbdff4cc1888eef15cafa0a5d56369e2f9d02595fed623f4b74b2cf2830c42c05a774f0943e700f9c768a82d9d348cad199e135c
2024-12-24 19:42:46 +01:00 · 2020-05-21 15:10:52 +08:00 · 2020-05-21 15:10:52 +08:00 · 098d0fd430
commit 098d0fd430
parent 9d464558eb
23 changed files with 316 additions and 46 deletions
--- a/.gitignore
+++ b/.gitignore
@ -9,6 +9,8 @@ reset-files.bash
 src/dash
 src/dashd
 src/dash-cli
+src/dash-gui
+src/dash-node
 src/dash-tx
 src/dash-wallet
 src/test/fuzz/*
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@ -204,6 +204,16 @@ x86_64-pc-linux-gnu-nowallet:
    HOST: x86_64-pc-linux-gnu
    DEP_OPTS: "NO_WALLET=1"

+# TODO: # Skip on non-depends, non-multiprocess PRs
+# if: type != pull_request OR commit_message =~ /depends:|multiprocess:/
+x86_64-pc-linux-gnu-multiprocess:
+  extends:
+    - .build-depends-template
+    - .skip-in-fast-mode-template
+  variables:
+    HOST: x86_64-pc-linux-gnu
+    DEP_OPTS: "MULTIPROCESS=1"
+
 x86_64-apple-darwin:
  extends:
    - .build-depends-template
@ -299,6 +309,15 @@ linux64_nowallet-build:
  variables:
    BUILD_TARGET: linux64_nowallet

+linux64_multiprocess-build:
+  extends:
+    - .build-template
+    - .skip-in-fast-mode-template
+  needs:
+    - x86_64-pc-linux-gnu-multiprocess
+  variables:
+    BUILD_TARGET: linux64_multiprocess
+
 #linux64_valgrind-build:
 #  extends:
 #    - .build-template
@ -362,6 +381,15 @@ linux64_ubsan-test:
  variables:
    BUILD_TARGET: linux64_ubsan

+linux64_multiprocess-test:
+  extends:
+    - .test-template
+    - .skip-in-fast-mode-template
+  needs:
+    - linux64_multiprocess-build
+  variables:
+    BUILD_TARGET: linux64_multiprocess
+
 #linux64_valgrind-test:
 #  extends:
 #    - .test-template
--- a/.travis.yml
+++ b/.travis.yml
@ -250,6 +250,11 @@ after_success:
      env: >-
        FILE_ENV="./ci/test/00_setup_env_native_fuzz_with_valgrind.sh"

+    - stage: test
+      name: 'x86_64 Linux [GOAL: install]  [focal]  [multiprocess]'
+      env: >-
+        FILE_ENV="./ci/test/00_setup_env_native_multiprocess.sh"
+
    - stage: test
      name: 'x86_64 Linux  [GOAL: install]  [focal]  [no wallet]'
      env: >-
--- a/ci/dash/test_integrationtests.sh
+++ b/ci/dash/test_integrationtests.sh
@ -42,7 +42,7 @@ echo "Using socketevents mode: $SOCKETEVENTS"
 EXTRA_ARGS="--dashd-arg=-socketevents=$SOCKETEVENTS"

 set +e
-LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib ./test/functional/test_runner.py --ci --attempts=3 --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --failfast --nocleanup --tmpdir=$(pwd)/testdatadirs $PASS_ARGS $EXTRA_ARGS
+LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib ${TEST_RUNNER_ENV} ./test/functional/test_runner.py --ci --attempts=3 --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --failfast --nocleanup --tmpdir=$(pwd)/testdatadirs $PASS_ARGS $EXTRA_ARGS
 RESULT=$?
 set -e

--- a/ci/test/00_setup_env.sh
+++ b/ci/test/00_setup_env.sh
@ -39,6 +39,7 @@ export USE_BUSY_BOX=${USE_BUSY_BOX:-false}
 export RUN_UNIT_TESTS=${RUN_UNIT_TESTS:-true}
 export RUN_INTEGRATION_TESTS=${RUN_INTEGRATION_TESTS:-true}
 export RUN_SECURITY_TESTS=${RUN_SECURITY_TESTS:-false}
+export TEST_RUNNER_ENV=${TEST_RUNNER_ENV:-}
 export RUN_FUZZ_TESTS=${RUN_FUZZ_TESTS:-false}
 export RUN_SYMBOL_TESTS=${RUN_SYMBOL_TESTS:-true}
 export CONTAINER_NAME=${CONTAINER_NAME:-ci_unnamed}
--- a/ci/test/00_setup_env_native_multiprocess.sh
+++ b/ci/test/00_setup_env_native_multiprocess.sh
@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# 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.
+
+export LC_ALL=C.UTF-8
+
+export CONTAINER_NAME=ci_native_multiprocess
+export PACKAGES="cmake python3"
+export DEP_OPTS="MULTIPROCESS=1"
+export GOAL="install"
+export BITCOIN_CONFIG=""
+export TEST_RUNNER_ENV="BITCOIND=dash-node"
--- a/configure.ac
+++ b/configure.ac
@ -256,6 +256,24 @@ AC_ARG_ENABLE([zmq],
  [use_zmq=$enableval],
  [use_zmq=yes])

+AC_ARG_WITH([libmultiprocess],
+  [AS_HELP_STRING([--with-libmultiprocess=yes|no|auto],
+  [Build with libmultiprocess library. (default: auto, i.e. detect with pkg-config)])],
+  [with_libmultiprocess=$withval],
+  [with_libmultiprocess=auto])
+
+AC_ARG_WITH([mpgen],
+  [AS_HELP_STRING([--with-mpgen=yes|no|auto|PREFIX],
+  [Build with libmultiprocess codegen tool. Useful to specify different libmultiprocess host system library and build system codegen tool prefixes when cross-compiling (default is host system libmultiprocess prefix)])],
+  [with_mpgen=$withval],
+  [with_mpgen=auto])
+
+AC_ARG_ENABLE([multiprocess],
+  [AS_HELP_STRING([--enable-multiprocess],
+  [build multiprocess dash-node, dash-wallet, and dash-gui executables in addition to monolithic dashd and dash-qt executables. Requires libmultiprocess library. Experimental (default is no)])],
+  [enable_multiprocess=$enableval],
+  [enable_multiprocess=no])
+
 AC_ARG_ENABLE(man,
    [AS_HELP_STRING([--disable-man],
                    [do not install man pages (default is to install)])],,
@ -1530,6 +1548,50 @@ dnl check if libgmp is present
 AC_CHECK_HEADER([gmp.h],, AC_MSG_ERROR(libgmp headers missing))
 AC_CHECK_LIB([gmp],  [__gmpz_init],GMP_LIBS=-lgmp, AC_MSG_ERROR(libgmp missing))

+dnl libmultiprocess library check
+
+libmultiprocess_found=no
+if test "x$with_libmultiprocess" = xyes || test "x$with_libmultiprocess" = xauto; then
+  if test "x$use_pkgconfig" = xyes; then
+    m4_ifdef([PKG_CHECK_MODULES], [PKG_CHECK_MODULES([LIBMULTIPROCESS], [libmultiprocess], [
+       libmultiprocess_found=yes;
+       libmultiprocess_prefix=`$PKG_CONFIG --variable=prefix libmultiprocess`;
+    ], [true])])
+  fi
+elif test "x$with_libmultiprocess" != xno; then
+  AC_MSG_ERROR([--with-libmultiprocess=$with_libmultiprocess value is not yes, auto, or no])
+fi
+AC_SUBST(LIBMULTIPROCESS_CFLAGS)
+AC_SUBST(LIBMULTIPROCESS_LIBS)
+
+dnl Enable multiprocess check
+
+if test "x$enable_multiprocess" = xyes; then
+  if test "x$libmultiprocess_found" != xyes; then
+    AC_MSG_ERROR([--enable-multiprocess=yes option specified but libmultiprocess library was not found. May need to install libmultiprocess library, or specify install path with PKG_CONFIG_PATH environment variable. Running 'pkg-config --debug libmultiprocess' may be helpful for debugging.])
+  fi
+  build_multiprocess=yes
+elif test "x$enable_multiprocess" = xauto; then
+  build_multiprocess=$libmultiprocess_found
+else
+  build_multiprocess=no
+fi
+
+AM_CONDITIONAL([BUILD_MULTIPROCESS],[test "x$build_multiprocess" = xyes])
+AM_CONDITIONAL([BUILD_BITCOIN_NODE], [test "x$build_multiprocess" = xyes])
+AM_CONDITIONAL([BUILD_BITCOIN_GUI], [test "x$build_multiprocess" = xyes])
+
+dnl codegen tools check
+
+if test x$build_multiprocess != xno; then
+  if test "x$with_mpgen" = xyes || test "x$with_mpgen" = xauto; then
+    MPGEN_PREFIX="$libmultiprocess_prefix"
+  elif test "x$with_mpgen" != xno; then
+    MPGEN_PREFIX="$with_mpgen";
+  fi
+  AC_SUBST(MPGEN_PREFIX)
+fi
+
 AC_MSG_CHECKING([whether to build dashd])
 AM_CONDITIONAL([BUILD_BITCOIND], [test x$build_bitcoind = xyes])
 AC_MSG_RESULT($build_bitcoind)
@ -1853,6 +1915,7 @@ esac

 echo
 echo "Options used to compile and link:"
+echo "  multiprocess  = $build_multiprocess"
 echo "  with wallet         = $enable_wallet"
 echo "  with gui / qt       = $bitcoin_enable_qt"
 if test "x$enable_wallet" != "xno"; then
--- a/depends/Makefile
+++ b/depends/Makefile
@ -40,6 +40,7 @@ NO_WALLET ?=
 NO_ZMQ ?=
 NO_UPNP ?=
 NO_NATPMP ?=
+MULTIPROCESS ?=
 FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources

 BUILD = $(shell ./config.guess)
@ -152,6 +153,7 @@ upnp_packages_$(NO_UPNP) = $(upnp_packages)
 natpmp_packages_$(NO_NATPMP) = $(natpmp_packages)

 zmq_packages_$(NO_ZMQ) = $(zmq_packages)
+multiprocess_packages_$(MULTIPROCESS) = $(multiprocess_packages)

 packages += $($(host_arch)_$(host_os)_packages) $($(host_os)_packages) $(qt_packages_) $(wallet_packages_) $(upnp_packages_) $(natpmp_packages_)
 native_packages += $($(host_arch)_$(host_os)_native_packages) $($(host_os)_native_packages)
@ -160,6 +162,11 @@ ifneq ($(zmq_packages_),)
 packages += $(zmq_packages)
 endif

+ifeq ($(multiprocess_packages_),)
+packages += $(multiprocess_packages)
+native_packages += $(multiprocess_native_packages)
+endif
+
 all_packages = $(packages) $(native_packages)

 meta_depends = Makefile funcs.mk builders/default.mk hosts/default.mk hosts/$(host_os).mk builders/$(build_os).mk
@ -227,6 +234,7 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
            -e 's|@no_sqlite@|$(NO_SQLITE)|' \
            -e 's|@no_upnp@|$(NO_UPNP)|' \
            -e 's|@no_natpmp@|$(NO_NATPMP)|' \
+            -e 's|@multiprocess@|$(MULTIPROCESS)|' \
            -e 's|@debug@|$(DEBUG)|' \
            $< > $@
 	touch $@
--- a/depends/README.md
+++ b/depends/README.md
@ -107,6 +107,7 @@ The following can be set when running make: `make FOO=bar`
 - `NO_SQLITE`: Don't download/build/cache SQLite
 - `NO_UPNP`: Don't download/build/cache packages needed for enabling UPnP
 - `NO_NATPMP`: Don't download/build/cache packages needed for enabling NAT-PMP
+- `MULTIPROCESS`: build libmultiprocess (experimental, requires cmake)
 - `DEBUG`: Disable some optimizations and enable more runtime checking
 - `HOST_ID_SALT`: Optional salt to use when generating host package ids
 - `BUILD_ID_SALT`: Optional salt to use when generating build package ids
--- a/depends/config.site.in
+++ b/depends/config.site.in
@ -26,6 +26,9 @@ fi
 if test -z "$with_qt_bindir" && test -z "@no_qt@"; then
  with_qt_bindir="${depends_prefix}/native/bin"
 fi
+if test -z "$with_mpgen" && test -n "@multiprocess@"; then
+  with_mpgen="${depends_prefix}/native"
+fi

 if test -z "$with_qrencode" && test -n "@no_qr@"; then
  with_qrencode=no
@ -43,6 +46,10 @@ if test -z "$with_sqlite" && test -n "@no_sqlite@"; then
  with_sqlite=no
 fi

+if test -z "$enable_multiprocess" && test -n "@multiprocess@"; then
+  enable_multiprocess=yes
+fi
+
 if test -z "$with_miniupnpc" && test -n "@no_upnp@"; then
  with_miniupnpc=no
 fi
--- a/depends/funcs.mk
+++ b/depends/funcs.mk
@ -138,11 +138,11 @@ $(1)_config_env+=$($(1)_config_env_$(host_arch)_$(host_os)) $($(1)_config_env_$(

 $(1)_config_env+=PKG_CONFIG_LIBDIR=$($($(1)_type)_prefix)/lib/pkgconfig
 $(1)_config_env+=PKG_CONFIG_PATH=$($($(1)_type)_prefix)/share/pkgconfig
+$(1)_config_env+=CMAKE_MODULE_PATH=$($($(1)_type)_prefix)/lib/cmake
 $(1)_config_env+=PATH=$(build_prefix)/bin:$(PATH)
 $(1)_build_env+=PATH=$(build_prefix)/bin:$(PATH)
 $(1)_stage_env+=PATH=$(build_prefix)/bin:$(PATH)
 $(1)_autoconf=./configure --host=$($($(1)_type)_host) --prefix=$($($(1)_type)_prefix) $$($(1)_config_opts) CC="$$($(1)_cc)" CXX="$$($(1)_cxx)"
-
 ifneq ($($(1)_nm),)
 $(1)_autoconf += NM="$$($(1)_nm)"
 endif
@ -164,6 +164,15 @@ endif
 ifneq ($($(1)_ldflags),)
 $(1)_autoconf += LDFLAGS="$$($(1)_ldflags)"
 endif
+
+$(1)_cmake=cmake -DCMAKE_INSTALL_PREFIX=$($($(1)_type)_prefix)
+ifneq ($($(1)_type),build)
+ifneq ($(host),$(build))
+$(1)_cmake += -DCMAKE_SYSTEM_NAME=$($(host_os)_cmake_system) -DCMAKE_SYSROOT=$(host_prefix)
+$(1)_cmake += -DCMAKE_C_COMPILER_TARGET=$(host) -DCMAKE_C_COMPILER=$(firstword $($($(1)_type)_CC)) -DCMAKE_C_FLAGS="$(wordlist 2,1000,$($($(1)_type)_CC))"
+$(1)_cmake += -DCMAKE_CXX_COMPILER_TARGET=$(host) -DCMAKE_CXX_COMPILER=$(firstword $($($(1)_type)_CXX)) -DCMAKE_CXX_FLAGS="$(wordlist 2,1000,$($($(1)_type)_CXX))"
+endif
+endif
 endef

 define int_add_cmds
--- a/depends/hosts/android.mk
+++ b/depends/hosts/android.mk
@ -9,3 +9,4 @@ android_CXX=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang++
 android_CC=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang
 android_RANLIB=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)-ranlib
 endif
+android_cmake_system=Android
--- a/depends/hosts/darwin.mk
+++ b/depends/hosts/darwin.mk
@ -120,3 +120,5 @@ darwin_release_CXXFLAGS=$(darwin_release_CFLAGS)

 darwin_debug_CFLAGS=-O1
 darwin_debug_CXXFLAGS=$(darwin_debug_CFLAGS)
+
+darwin_cmake_system=Darwin
--- a/depends/hosts/linux.mk
+++ b/depends/hosts/linux.mk
@ -29,3 +29,4 @@ i686_linux_CXX=$(default_host_CXX) -m32
 x86_64_linux_CC=$(default_host_CC) -m64
 x86_64_linux_CXX=$(default_host_CXX) -m64
 endif
+linux_cmake_system=Linux
--- a/depends/hosts/mingw32.mk
+++ b/depends/hosts/mingw32.mk
@ -8,3 +8,5 @@ mingw32_debug_CFLAGS=-O1
 mingw32_debug_CXXFLAGS=$(mingw32_debug_CFLAGS)

 mingw32_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC
+
+mingw_cmake_system=Windows
--- a/depends/packages/capnp.mk
+++ b/depends/packages/capnp.mk
@ -0,0 +1,18 @@
+package=capnp
+$(package)_version=$(native_$(package)_version)
+$(package)_download_path=$(native_$(package)_download_path)
+$(package)_file_name=$(native_$(package)_file_name)
+$(package)_sha256_hash=$(native_$(package)_sha256_hash)
+$(package)_dependencies=native_$(package)
+
+define $(package)_config_cmds
+  $($(package)_autoconf) --with-external-capnp
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
--- a/depends/packages/libmultiprocess.mk
+++ b/depends/packages/libmultiprocess.mk
@ -0,0 +1,18 @@
+package=libmultiprocess
+$(package)_version=$(native_$(package)_version)
+$(package)_download_path=$(native_$(package)_download_path)
+$(package)_file_name=$(native_$(package)_file_name)
+$(package)_sha256_hash=$(native_$(package)_sha256_hash)
+$(package)_dependencies=native_$(package) boost capnp
+
+define $(package)_config_cmds
+  $($(package)_cmake)
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
--- a/depends/packages/native_capnp.mk
+++ b/depends/packages/native_capnp.mk
@ -0,0 +1,18 @@
+package=native_capnp
+$(package)_version=0.7.0
+$(package)_download_path=https://capnproto.org/
+$(package)_download_file=capnproto-c++-$($(package)_version).tar.gz
+$(package)_file_name=capnproto-cxx-$($(package)_version).tar.gz
+$(package)_sha256_hash=c9a4c0bd88123064d483ab46ecee777f14d933359e23bff6fb4f4dbd28b4cd41
+
+define $(package)_config_cmds
+  $($(package)_autoconf)
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
--- a/depends/packages/native_libmultiprocess.mk
+++ b/depends/packages/native_libmultiprocess.mk
@ -0,0 +1,18 @@
+package=native_libmultiprocess
+$(package)_version=5741d750a04e644a03336090d8979c6d033e32c0
+$(package)_download_path=https://github.com/chaincodelabs/libmultiprocess/archive
+$(package)_file_name=$($(package)_version).tar.gz
+$(package)_sha256_hash=ac848db49a6ed53e423c62d54bd87f1f08cbb0326254a8667e10bbfe5bf032a4
+$(package)_dependencies=native_capnp
+
+define $(package)_config_cmds
+  $($(package)_cmake)
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@ -19,6 +19,9 @@ zmq_packages=zeromq
 upnp_packages=miniupnpc
 natpmp_packages=libnatpmp

+multiprocess_packages = libmultiprocess capnp
+multiprocess_native_packages = native_libmultiprocess native_capnp
+
 darwin_native_packages = native_ds_store native_mac_alias

 $(host_arch)_$(host_os)_native_packages += native_b2
--- a/doc/multiprocess.md
+++ b/doc/multiprocess.md
@ -0,0 +1,35 @@
+# Multiprocess Dash
+
+On unix systems, the `--enable-multiprocess` build option can be passed to `./configure` to build new `dash-node`, `dash-wallet`, and `dash-gui` executables alongside existing `dashd` and `dash-qt` executables.
+
+`dash-node` is a drop-in replacement for `dashd`, and `dash-gui` is a drop-in replacement for `dash-qt`, and there are no differences in use or external behavior between the new and old executables. But internally (after backporting [bitcoin#10102](https://github.com/bitcoin/bitcoin/pull/10102)), `dash-gui` will spawn a `dash-node` process to run P2P and RPC code, communicating with it across a socket pair, and `dash-node` will spawn `dash-wallet` to run wallet code, also communicating over a socket pair. This will let node, wallet, and GUI code run in separate address spaces for better isolation, and allow future improvements like being able to start and stop components independently on different machines and environments.
+
+## Next steps
+
+Specific next steps after backporting [bitcoin#10102](https://github.com/bitcoin/bitcoin/pull/10102) will be:
+
+- [ ] Adding `-ipcbind` and `-ipcconnect` options to `dash-node`, `dash-wallet`, and `dash-gui` executables so they can listen and connect to TCP ports and unix socket paths. This will allow separate processes to be started and stopped any time and connect to each other.
+- [ ] Adding `-server` and `-rpcbind` options to the `dash-wallet` executable so wallet processes can handle RPC requests directly without going through the node.
+- [ ] Supporting windows, not just unix systems. The existing socket code is already cross-platform, so the only windows-specific code that needs to be written is code spawning a process and passing a socket descriptor. This can be implemented with `CreateProcess` and `WSADuplicateSocket`. Example: https://memset.wordpress.com/2010/10/13/win32-api-passing-socket-with-ipc-method/.
+- [ ] Adding sandbox features, restricting subprocess access to resources and data. See [https://eklitzke.org/multiprocess-bitcoin](https://eklitzke.org/multiprocess-bitcoin).
+
+## Debugging
+
+After backporting [bitcoin#10102](https://github.com/bitcoin/bitcoin/pull/10102), the `-debug=ipc` command line option can be used to see requests and responses between processes.
+
+## Installation
+
+The multiprocess feature requires [Cap'n Proto](https://capnproto.org/) and [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) as dependencies. A simple way to get starting using it without installing these dependencies manually is to use the [depends system](../depends) with the `MULTIPROCESS=1` [dependency option](../depends#dependency-options) passed to make:
+
+```
+cd <DASH_SOURCE_DIRECTORY>
+make -C depends NO_QT=1 MULTIPROCESS=1
+./configure --prefix=$PWD/depends/x86_64-pc-linux-gnu
+make
+src/dash-node -regtest -printtoconsole -debug=ipc
+DASHD=dash-node test/functional/test_runner.py
+```
+
+The configure script will pick up settings and library locations from the depends directory, so there is no need to pass `--enable-multiprocess` as a separate flag when using the depends system (it's controlled by the `MULTIPROCESS=1` option).
+
+Alternately, you can install [Cap'n Proto](https://capnproto.org/) and [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) packages on your system, and just run `./configure --enable-multiprocess` without using the depends system. The configure script will be able to locate the installed packages via [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/). See [Installation](https://github.com/chaincodelabs/libmultiprocess#installation) section of the libmultiprocess readme for install steps. See [build-unix.md](build-unix.md) and [build-osx.md](build-osx.md) for information about installing dependencies in general.
--- a/src/Makefile.am
+++ b/src/Makefile.am
@ -110,6 +110,10 @@ if BUILD_BITCOIND
  bin_PROGRAMS += dashd
 endif

+if BUILD_BITCOIN_NODE
+  bin_PROGRAMS += dash-node
+endif
+
 if BUILD_BITCOIN_CLI
  bin_PROGRAMS += dash-cli
 endif
@ -796,22 +800,21 @@ libbitcoin_cli_a_SOURCES = \
 nodist_libbitcoin_util_a_SOURCES = $(srcdir)/obj/build.h
 #

-# dashd binary #
-dashd_SOURCES = bitcoind.cpp
-dashd_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
-dashd_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
-dashd_LDFLAGS = $(LDFLAGS_WRAP_EXCEPTIONS) $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) $(PTHREAD_FLAGS)
+# dashd & dash-node binaries #
+bitcoin_daemon_sources = bitcoind.cpp
+bitcoin_bin_cppflags = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+bitcoin_bin_cxxflags = $(AM_CXXFLAGS) $(PIE_FLAGS)
+bitcoin_bin_ldflags = $(LDFLAGS_WRAP_EXCEPTIONS) $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) $(PTHREAD_FLAGS)

 if TARGET_WINDOWS
-dashd_SOURCES += dashd-res.rc
+bitcoin_daemon_sources += dashd-res.rc
 endif

-dashd_LDADD = \
-  $(LIBBITCOIN_SERVER) \
+bitcoin_bin_ldadd = \
  $(LIBBITCOIN_WALLET) \
  $(LIBBITCOIN_COMMON) \
-  $(LIBUNIVALUE) \
  $(LIBBITCOIN_UTIL) \
+  $(LIBUNIVALUE) \
  $(LIBBITCOIN_ZMQ) \
  $(LIBBITCOIN_CONSENSUS) \
  $(LIBBITCOIN_CRYPTO) \
@ -821,7 +824,19 @@ dashd_LDADD = \
  $(LIBMEMENV) \
  $(LIBSECP256K1)

-dashd_LDADD += $(BACKTRACE_LIB) $(BOOST_LIBS) $(BDB_LIBS) $(MINIUPNPC_LIBS) $(NATPMP_LIBS) $(SQLITE_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(ZMQ_LIBS) $(GMP_LIBS)
+bitcoin_bin_ldadd += $(BACKTRACE_LIB) $(BOOST_LIBS) $(BDB_LIBS) $(MINIUPNPC_LIBS) $(NATPMP_LIBS) $(SQLITE_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(ZMQ_LIBS) $(GMP_LIBS)
+
+dashd_SOURCES = $(bitcoin_daemon_sources)
+dashd_CPPFLAGS = $(bitcoin_bin_cppflags)
+dashd_CXXFLAGS = $(bitcoin_bin_cxxflags)
+dashd_LDFLAGS = $(bitcoin_bin_ldflags)
+dashd_LDADD = $(LIBBITCOIN_SERVER) $(bitcoin_bin_ldadd)
+
+dash_node_SOURCES = $(bitcoin_daemon_sources)
+dash_node_CPPFLAGS = $(bitcoin_bin_cppflags)
+dash_node_CXXFLAGS = $(bitcoin_bin_cxxflags)
+dash_node_LDFLAGS = $(bitcoin_bin_ldflags)
+dash_node_LDADD = $(LIBBITCOIN_SERVER) $(bitcoin_bin_ldadd)

 # dash-cli binary #
 dash_cli_SOURCES = bitcoin-cli.cpp
@ -865,32 +880,14 @@ dash_tx_LDADD += $(BACKTRACE_LIB) $(BOOST_LIBS) $(GMP_LIBS)

 # dash-wallet binary #
 dash_wallet_SOURCES = bitcoin-wallet.cpp
-dash_wallet_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
-dash_wallet_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
-dash_wallet_LDFLAGS = $(LDFLAGS_WRAP_EXCEPTIONS) $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) $(PTHREAD_FLAGS)
+dash_wallet_CPPFLAGS = $(bitcoin_bin_cppflags)
+dash_wallet_CXXFLAGS = $(bitcoin_bin_cxxflags)
+dash_wallet_LDFLAGS = $(bitcoin_bin_ldflags)
+dash_wallet_LDADD = $(LIBBITCOIN_WALLET_TOOL) $(bitcoin_bin_ldadd)

 if TARGET_WINDOWS
 dash_wallet_SOURCES += dash-wallet-res.rc
 endif
-
-# Libraries below may be listed more than once to resolve circular dependencies (see
-# https://eli.thegreenplace.net/2013/07/09/library-order-in-static-linking#circular-dependency)
-dash_wallet_LDADD = \
-  $(LIBBITCOIN_WALLET_TOOL) \
-  $(LIBBITCOIN_WALLET) \
-  $(LIBBITCOIN_COMMON) \
-  $(LIBBITCOIN_CONSENSUS) \
-  $(LIBBITCOIN_UTIL) \
-  $(LIBBITCOIN_CRYPTO) \
-  $(LIBBITCOIN_ZMQ) \
-  $(LIBDASHBLS) \
-  $(LIBLEVELDB) \
-  $(LIBLEVELDB_SSE42) \
-  $(LIBMEMENV) \
-  $(LIBSECP256K1) \
-  $(LIBUNIVALUE)
-
-dash_wallet_LDADD += $(BACKTRACE_LIB) $(BOOST_LIBS) $(BDB_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(MINIUPNPC_LIBS) $(NATPMP_LIBS) $(SQLITE_LIBS) $(ZMQ_LIBS) $(GMP_LIBS)
 #

 # dashconsensus library #
--- a/src/Makefile.qt.include
+++ b/src/Makefile.qt.include
@ -4,6 +4,11 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.

 bin_PROGRAMS += qt/dash-qt
+
+if BUILD_BITCOIN_GUI
+  bin_PROGRAMS += dash-gui
+endif
+
 EXTRA_LIBRARIES += qt/libbitcoinqt.a

 # dash qt core #
@ -371,29 +376,43 @@ QT_FORMS_H=$(join $(dir $(QT_FORMS_UI)),$(addprefix ui_, $(notdir $(QT_FORMS_UI:
 # Most files will depend on the forms and moc files as includes. Generate them
 # before anything else.
 $(QT_MOC): $(QT_FORMS_H)
-$(qt_libbitcoinqt_a_OBJECTS) $(qt_dash_qt_OBJECTS) : | $(QT_MOC)
+$(qt_libbitcoinqt_a_OBJECTS) $(qt_dash_qt_OBJECTS) $(dash_gui_OBJECTS): | $(QT_MOC)

-# dash-qt binary #
-qt_dash_qt_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BITCOIN_QT_INCLUDES) \
+# dash-qt binary and dash-gui binaries #
+bitcoin_qt_cppflags = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BITCOIN_QT_INCLUDES) \
  $(QT_INCLUDES) $(QR_CFLAGS)
-qt_dash_qt_CXXFLAGS = $(AM_CXXFLAGS) $(QT_PIE_FLAGS)
+bitcoin_qt_cxxflags = $(AM_CXXFLAGS) $(QT_PIE_FLAGS)

-qt_dash_qt_SOURCES = qt/main.cpp
+bitcoin_qt_sources = qt/main.cpp
 if TARGET_WINDOWS
-  qt_dash_qt_SOURCES += $(BITCOIN_RC)
+  bitcoin_qt_sources += $(BITCOIN_RC)
 endif
-qt_dash_qt_LDADD = qt/libbitcoinqt.a $(LIBBITCOIN_SERVER)
+bitcoin_qt_ldadd = qt/libbitcoinqt.a $(LIBBITCOIN_SERVER)
 if ENABLE_WALLET
-qt_dash_qt_LDADD += $(LIBBITCOIN_UTIL) $(LIBBITCOIN_WALLET)
+bitcoin_qt_ldadd += $(LIBBITCOIN_UTIL) $(LIBBITCOIN_WALLET)
 endif
 if ENABLE_ZMQ
-qt_dash_qt_LDADD += $(LIBBITCOIN_ZMQ) $(ZMQ_LIBS)
+bitcoin_qt_ldadd += $(LIBBITCOIN_ZMQ) $(ZMQ_LIBS)
 endif
-qt_dash_qt_LDADD += $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CONSENSUS) $(LIBBITCOIN_CRYPTO) $(LIBDASHBLS) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBLEVELDB_SSE42) $(LIBMEMENV) \
+bitcoin_qt_ldadd += $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CONSENSUS) $(LIBBITCOIN_CRYPTO) $(LIBDASHBLS) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBLEVELDB_SSE42) $(LIBMEMENV) \
  $(BACKTRACE_LIB) $(BOOST_LIBS) $(QT_LIBS) $(QT_DBUS_LIBS) $(QR_LIBS) $(BDB_LIBS) $(MINIUPNPC_LIBS) $(NATPMP_LIBS) $(SQLITE_LIBS) $(LIBSECP256K1) \
  $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(GMP_LIBS)
-qt_dash_qt_LDFLAGS = $(LDFLAGS_WRAP_EXCEPTIONS) $(RELDFLAGS) $(AM_LDFLAGS) $(QT_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) $(PTHREAD_FLAGS)
-qt_dash_qt_LIBTOOLFLAGS = $(AM_LIBTOOLFLAGS) --tag CXX
+bitcoin_qt_ldflags = $(LDFLAGS_WRAP_EXCEPTIONS) $(RELDFLAGS) $(AM_LDFLAGS) $(QT_LDFLAGS) $(LIBTOOL_APP_LDFLAGS) $(PTHREAD_FLAGS)
+bitcoin_qt_libtoolflags = $(AM_LIBTOOLFLAGS) --tag CXX
+
+qt_dash_qt_CPPFLAGS = $(bitcoin_qt_cppflags)
+qt_dash_qt_CXXFLAGS = $(bitcoin_qt_cxxflags)
+qt_dash_qt_SOURCES = $(bitcoin_qt_sources)
+qt_dash_qt_LDADD = $(bitcoin_qt_ldadd)
+qt_dash_qt_LDFLAGS = $(bitcoin_qt_ldflags)
+qt_dash_qt_LIBTOOLFLAGS = $(bitcoin_qt_libtoolflags)
+
+dash_gui_CPPFLAGS = $(bitcoin_qt_cppflags)
+dash_gui_CXXFLAGS = $(bitcoin_qt_cxxflags)
+dash_gui_SOURCES = $(bitcoin_qt_sources)
+dash_gui_LDADD = $(bitcoin_qt_ldadd)
+dash_gui_LDFLAGS = $(bitcoin_qt_ldflags)
+dash_gui_LIBTOOLFLAGS = $(bitcoin_qt_libtoolflags)

 #locale/foo.ts -> locale/foo.qm
 QT_QM=$(QT_TS:.ts=.qm)