Android ADB 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. https://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 \

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 :=