使用libevent实现最简单的android http-server

其实就是把libevent sample 下的http-server.c 在android emulator 上跑起来
环境:
libevent: libevent-2.0.12-stable
sdk : android-sdk-linux_86 支持到2.01
ndk : android-ndk-r4b-linux-x86 1. 交叉编译
* 将libevent-2.0.12-stable 解压到home下libevent 目录
* 执行: ./configure --prefix=/home/liu/android-ndk-r4b/samples/libevent_install --host=arm-linux CC=~/tools/arm-2007q3/bin/arm-none-linux-gnueabi-gcc CXX=~/tools/arm-2007q3/bin/arm-none-linux-gnueabi-g++
make
make install
所有都安装到--prefix 所指定的目录中

* libevent 的maillist 上有直接用ndk toolchain 交叉编译成功的例子,
改成:
./configure --prefix=/home/liu/android-ndk-r4b/samples/libevent_install -host=arm-eabi CC=arm-linux-androideabi-gcc CPPFLAGS="-I$NDK_ROOT/platforms/android-8/arch-arm/usr/include/" CFLAGS="-nostdlib" LDFLAGS="-Wl,-rpath-link=$NDK_ROOT/platforms/android-8/arch-arm/usr/lib/ -L$NDK_ROOT/platforms/android-9/arch-arm/usr/lib/" LIBS="-lc"
听说也可以build成功libevent.so, 但是没弄成功

不过还好文件不多,还是按照ndk 下写andorid make file 2. NDK下编译
* 把libevent-2.0.12-stable 解压到home 目录下的libevent-ndk 目录下的jni 目录
* 把前面交叉编译生成的libevent/include/event2/event-config.h copy
到libevent-ndk/jin/include/event2/ 下
* 修改event-config.h 如下:

/*#undef _EVENT_HAVE_ARC4RANDOM*/
这句下面加上:
#define _EVENT_HAVE_ARC4RANDOM
//#define _EVENT_HAVE_FD_MASK 1 这句用//注掉

* 写android mk file
./configure 生成的makefile不是人写的,是机器生成的
所以参考makefile.am ,具体jni目录下Android.mk如下:

LOCAL_PATH := $(call my-dir)
#########################
# Build the libevent lib
include $(CLEAR_VARS)
LOCAL_MODULE := libevent
# devpoll.c kqueue.c evport.c
LOCAL_SRC_FILES := \
select.c \
poll.c \
epoll.c \
signal.c \
event.c evthread.c buffer.c \
bufferevent.c bufferevent_sock.c bufferevent_filter.c \
bufferevent_pair.c listener.c bufferevent_ratelim.c \
evmap.c log.c evutil.c evutil_rand.c strlcpy.c \
event_tagging.c http.c evdns.c evrpc.c
LOCAL_MODULE_TAGS := eng
#LOCAL_SYSTEM_SHARED_LIBRARIES := \
# libc
#LOCAL_SHARED_LIBRARIES := libc
LOCAL_LDLIBS := -lc
LOCAL_C_INCLUDES := $(LOCAL_PATH)/compat $(LOCAL_PATH)/include $(LOCAL_PATH)/
#$(LOCAL_PATH)/include/event2
LOCAL_CFLAGS := -O2 -g -W -Wall -DHAVE_CONFIG_H #-fno-strict-aliasing # liu -fno-strict-aliasing
LOCAL_PRELINK_MODULE := false
include $(BUILD_SHARED_LIBRARY)
#########################
# Build the test binary
include $(CLEAR_VARS)
LOCAL_SRC_FILES := test/test-init.c
LOCAL_MODULE := test_init
LOCAL_MODULE_TAGS := eng
#LOCAL_SYSTEM_SHARED_LIBRARIES := \
# libevent \
# libc
LOCAL_SHARED_LIBRARIES := libevent
LOCAL_LDLIBS := -lc
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
#LOCAL_CFLAGS := -O2 -g -W -Wall
include $(BUILD_EXECUTABLE)
#########################
# Build the httpd binary
include $(CLEAR_VARS)
LOCAL_SRC_FILES := sample/http-server.c
LOCAL_MODULE := test_httpd
LOCAL_MODULE_TAGS := eng
#LOCAL_SYSTEM_SHARED_LIBRARIES := \
# libevent \
# libc
LOCAL_SHARED_LIBRARIES := libevent
LOCAL_LDLIBS := -lc
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
#LOCAL_CFLAGS := -O2 -g -W -Wall
include $(BUILD_EXECUTABLE)

* jin下的 Application.mk
ndk emulator goodfish 是arm926的
支持armv5t就可以了
内容如下:

APP_ABI := armeabi

* 可以开始编译了
在ndk 安装目录下执行
./ndk-build -C ~/libevent-ndk/
成功之后在~/libevent-ndk/obj/local/armeabi目录下
生成3个文件:libevent.so ,test,test_httpd

3. 开始测试:
买不起真机也没关系,使用emulator
* 跑到sdk tools 目录下:
执行 android create avd -n ndk_test -t 1 然后配置

* 运行ndk_test emualtor
执行 emulator @ndk_test
跑起来后,缩到最小,以后不需要操作它了
* 运行adb push
将libevent.so ,test,test_httpd 3个
文件全部push 到 emulator下的data目录下

* 连到emualtor 下的httpd 为了能在emulator 上跑，需要做下面修改
修改jni\sample\http-server.c:

//handle=evhttp_bind_socket_with_handle(http,"0.0.0.0",port);
handle=evhttp_bind_socket_with_handle(http,"127.0.0.1",6060);

重新 ./ndk-build -C ~/libevent-ndk/
把新的test_httpd push 到emualtor data 目录下

执行 adb forward tcp:6060 tcp:6060 *adb shell 运行: cd data ./test_httpd /data 显示： listening on 127.0.0.1:6060

* 最后打开firefox 输入地址,可以看到：

4. 后续:
可以继续深入libevent ,cgi,sqllite,写一个有实际作用的http server
转自http://my.chinaunix.net/space.php?uid=20514606&do=blog&id=485808

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