AndroidADB源码分析总结Android之ADB总结
本⽂内容如下：
1. makefile分析及总结
2. adb框架介绍
3. adbd源码分析
3.1 adbd初始化流程分析
3.2 adb shell流程分析
3.3 adb root流程分析
4. adb常⽤命令
⼀、makefile分析及总结
// 以下内容摘录⾃android/system/core/adb/Android.mk
# Copyright 2005 The Android Open Source Project
#
# Android.mk for adb
#
LOCAL_PATH:= $(call my-dir)
// 使⽤HOST_OS这个宏兼容不同的PC操作系统，⽐如windows，linux，mac等。
ifeq ($(HOST_OS),windows)
adb_host_clang := false # libc++ for mingw not ready yet.
else
adb_host_clang := true
endif
adb_version := $(shell git -C $(LOCAL_PATH) rev-parse --short=12 HEAD 2>/dev/null)-android
ADB_COMMON_CFLAGS := \
-Wall -Werror \
-Wno-unused-parameter \
-DADB_REVISION='"$(adb_version)"' \
# libadb
# =========================================================
# Much of adb is duplicated in bootable/recovery/minadb and fastboot. Changes
# made to adb rarely get ported to the other two, so the trees have diverged a
# bit. We'd like to stop this because it is a maintenance nightmare, but the
# divergence makes this difficult to do all at once. For now, we will start
# small by moving common files into a static library. Hopefully some day we can
# get enough of adb in here that we no longer need minadb. b/17626262
LIBADB_SRC_FILES := \
adb.cpp \
adb_auth.cpp \
adb_io.cpp \
adb_listeners.cpp \
adb_utils.cpp \
sockets.cpp \
transport.cpp \
transport_local.cpp \
transport_usb.cpp \
LIBADB_TEST_SRCS := \
adb_io_test.cpp \
adb_utils_test.cpp \
transport_test.cpp \
制作android软件流程
LIBADB_CFLAGS := \
$(ADB_COMMON_CFLAGS) \
-Wno-missing-field-initializers \
-fvisibility=hidden \
LIBADB_darwin_SRC_FILES := \
fdevent.cpp \
get_my_path_darwin.cpp \
usb_osx.cpp \
LIBADB_linux_SRC_FILES := \
fdevent.cpp \
get_my_path_linux.cpp \
usb_linux.cpp \
LIBADB_windows_SRC_FILES := \
get_my_path_windows.cpp \
sysdeps_win32.cpp \
usb_windows.cpp \
include $(CLEAR_VARS)
LOCAL_CLANG := true
// 编译⽣成libadbd静态库，供adbd deamon进程使⽤
LOCAL_MODULE := libadbd
LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=0
LOCAL_SRC_FILES := \
$(LIBADB_SRC_FILES) \
adb_auth_client.cpp \
fdevent.cpp \
jdwp_service.cpp \
qemu_tracing.cpp \
usb_linux_client.cpp \
LOCAL_SHARED_LIBRARIES := libbase
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_CLANG := $(adb_host_clang)
// 编译⽣成libadb动态库，供pc端adb可执⾏⽂件使⽤
LOCAL_MODULE := libadb
LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=1
LOCAL_SRC_FILES := \
$(LIBADB_SRC_FILES) \
$(LIBADB_$(HOST_OS)_SRC_FILES) \
adb_auth_host.cpp \
LOCAL_SHARED_LIBRARIES := libbase
# Even though we're building a static library (and thus there's no link step for # this to take effect), this adds the SSL includes to our path.
LOCAL_STATIC_LIBRARIES := libcrypto_static
ifeq ($(HOST_OS),windows)
LOCAL_C_INCLUDES += development/host/windows/usb/api/
endif
include $(BUILD_HOST_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_CLANG := true
// 编译⽣成adbd的测试程序
LOCAL_MODULE := adbd_test
LOCAL_CFLAGS := -DADB_HOST=0 $(LIBADB_CFLAGS)
LOCAL_SRC_FILES := $(LIBADB_TEST_SRCS)
LOCAL_STATIC_LIBRARIES := libadbd
LOCAL_SHARED_LIBRARIES := liblog libbase libcutils
include $(BUILD_NATIVE_TEST)
include $(CLEAR_VARS)
LOCAL_CLANG := $(adb_host_clang)
// 编译⽣成adb的测试程序
LOCAL_MODULE := adb_test
LOCAL_CFLAGS := -DADB_HOST=1 $(LIBADB_CFLAGS)
LOCAL_SRC_FILES := $(LIBADB_TEST_SRCS) services.cpp
LOCAL_SHARED_LIBRARIES := liblog libbase
LOCAL_STATIC_LIBRARIES := \
libadb \
libcrypto_static \
libcutils \
ifeq ($(HOST_OS),linux)
LOCAL_LDLIBS += -lrt -ldl -lpthread
endif
ifeq ($(HOST_OS),darwin)
LOCAL_LDLIBS += -framework CoreFoundation -framework IOKit
endif
include $(BUILD_HOST_NATIVE_TEST)
# adb device tracker (used by ddms) test tool
# =========================================================
ifeq ($(HOST_OS),linux)
include $(CLEAR_VARS)
LOCAL_CLANG := $(adb_host_clang)
// 编译⽣成adb_device_tracker服务的测试程序
LOCAL_MODULE := adb_device_tracker_test
LOCAL_CFLAGS := -DADB_HOST=1 $(LIBADB_CFLAGS)
LOCAL_SRC_FILES := test_track_devices.cpp
LOCAL_SHARED_LIBRARIES := liblog libbase
LOCAL_STATIC_LIBRARIES := libadb libcrypto_static libcutils
LOCAL_LDLIBS += -lrt -ldl -lpthread
include $(BUILD_HOST_EXECUTABLE)
endif
# adb host tool
# =========================================================
include $(CLEAR_VARS)
ifeq ($(HOST_OS),linux)
LOCAL_LDLIBS += -lrt -ldl -lpthread
LOCAL_CFLAGS += -DWORKAROUND_BUG6558362
endif
ifeq ($(HOST_OS),darwin)
LOCAL_LDLIBS += -lpthread -framework CoreFoundation -framework IOKit -framework Carbon LOCAL_CFLAGS += -Wno-sizeof-pointer-memaccess -Wno-unused-parameter
endif
ifeq ($(HOST_OS),windows)
ifeq ($(HOST_OS),windows)
LOCAL_LDLIBS += -lws2_32 -lgdi32
EXTRA_STATIC_LIBS := AdbWinApi
endif
LOCAL_CLANG := $(adb_host_clang)
LOCAL_SRC_FILES := \
adb_main.cpp \
console.cpp \
commandline.cpp \
adb_client.cpp \
services.cpp \
file_sync_client.cpp \
LOCAL_CFLAGS += \
$(ADB_COMMON_CFLAGS) \
-D_GNU_SOURCE \
-DADB_HOST=1 \
// 编译⽣成PC端的adb可执⾏⽂件，位于sdk/platform-tools/adb⽬录下LOCAL_MODULE := adb
LOCAL_MODULE_TAGS := debug
LOCAL_STATIC_LIBRARIES := \
libadb \
libbase \
libcrypto_static \
libcutils \
liblog \
$(EXTRA_STATIC_LIBS) \
# libc++ not available on windows yet
ifneq ($(HOST_OS),windows)
LOCAL_CXX_STL := libc++_static
endif
# Don't add anything here, we don't want additional shared dependencies # on the host adb tool, and shared libraries that link against libc++
# will violate ODR
LOCAL_SHARED_LIBRARIES :=
include $(BUILD_HOST_EXECUTABLE)
$(call dist-for-goals,dist_files sdk,$(LOCAL_BUILT_MODULE))
ifeq ($(HOST_OS),windows)
$(LOCAL_INSTALLED_MODULE): \
$(HOST_OUT_EXECUTABLES)/AdbWinApi.dll \
$(HOST_OUT_EXECUTABLES)/AdbWinUsbApi.dll
endif
# adbd device daemon
# ========================================================= include $(CLEAR_VARS)
LOCAL_CLANG := true
LOCAL_SRC_FILES := \
adb_main.cpp \
services.cpp \
file_sync_service.cpp \
framebuffer_service.cpp \
remount_service.cpp \
set_verity_enable_state_service.cpp \
set_verity_enable_state_service.cpp \
LOCAL_CFLAGS := \
$(ADB_COMMON_CFLAGS) \
-DADB_HOST=0 \
-D_GNU_SOURCE \
-Wno-deprecated-declarations \
// engineer模式下⽆需AUTH认证
LOCAL_CFLAGS += -DALLOW_ADBD_NO_AUTH=$(if $(filter userdebug eng,$(TARGET_BUILD_VARIANT)),1,0)
ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
LOCAL_CFLAGS += -DALLOW_ADBD_DISABLE_VERITY=1
LOCAL_CFLAGS += -DALLOW_ADBD_ROOT=1
endif
// 编译⽣成设备端或模拟器端的adbd deamon进程
LOCAL_MODULE := adbd
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT_SBIN)
LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED)
LOCAL_C_INCLUDES += system/extras/ext4_utils
LOCAL_STATIC_LIBRARIES := \
libadbd \
libbase \
libfs_mgr \
liblog \
libcutils \
libc \
libmincrypt \
libselinux \
libext4_utils_static \
include $(BUILD_EXECUTABLE)
关键点总结：
所有的adb程序（PC端和设备端）共⽤⼀套代码，只是借助于HOST_OS这个宏进⾏隔离，编译时会⽣成两个可执⾏⽂件：
1．：运⾏于PC端(包括Windows、Linux、MacOS等操作系统之上)，位于platform/tools/adb⽬录下，透过adb命令可以唤起。2．adbd：运⾏于Android设备上，开机时⾃动启动。
相应的，源码中也会由ADB_HOST宏⽤来区分本地主机(adb)和⽬标机(adbd)。
Engineer模式下会定义ALLOW_ADBD_NO_AUTH，源码中会使⽤到。
⼆、adb框架介绍

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