Android系统--Binder系统具体框架分析（一）补充

补充：对Binder驱动分析一的代码补充，添加saygoobye和saygoodbye_to服务

test_server.h

#ifndef _TEST_SERVER_H#define _TEST_SERVER_H#define HELLO_SVR_CMD_SAYHELLO 0#define HELLO_SVR_CMD_SAYHELLO_TO 1#define GOODBYE_SVR_CMD_SAYGOODBYE 0#define GOODBYE_SVR_CMD_SAYGOODBYE_TO 1#endif // _TEST_SERVER_H

test_server.c

/* Copyright 2008 The Android Open Source Project*/#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <linux/types.h>#include<stdbool.h>#include <string.h>#include <private/android_filesystem_config.h>#include "binder.h"#include "test_server.h"int svcmgr_publish(struct binder_state *bs, uint32_t target, const char *name, void *ptr){int status;unsigned iodata[512/4];struct binder_io msg, reply;bio_init(&msg, iodata, sizeof(iodata), 4);  //分配binder_io结构体空间bio_put_uint32(&msg, 0);  // strict mode headerbio_put_string16_x(&msg, SVC_MGR_NAME);bio_put_string16_x(&msg, name);  bio_put_obj(&msg, ptr);  //构造结构体if (binder_call(bs, &msg, &reply, target, SVC_MGR_ADD_SERVICE))  //添加注册Binder服务return -1;status = bio_get_uint32(&reply);  //获得返回值binder_done(bs, &msg, &reply);   //结束标志return status;}void sayhello(void){static int cnt = 0;fprintf(stderr, "say hello : %d\n", cnt++);}int sayhello_to(char *name){static int cnt = 0;fprintf(stderr, "say hello to %s : %d\n", name, cnt++);return cnt;}void saygoodbye(void){static int cnt = 0;fprintf(stderr, "say goodbye : %d\n", cnt++);}int saygoodbye_to(char *name){static int cnt = 0;fprintf(stderr, "say goodbye to %s : %d\n", name, cnt++);return cnt;}int hello_service_handler(struct binder_state *bs,struct binder_transaction_data *txn,struct binder_io *msg,struct binder_io *reply){/* 根据txn->code知道要调用哪一个函数* 如果需要参数, 可以从msg取出* 如果要返回结果, 可以把结果放入reply*//* sayhello* sayhello_to*/uint16_t *s;char name[512];size_t len;uint32_t handle;uint32_t strict_policy;int i;// Equivalent to Parcel::enforceInterface(), reading the RPC// header with the strict mode policy mask and the interface name.// Note that we ignore the strict_policy and don't propagate it// further (since we do no outbound RPCs anyway).strict_policy = bio_get_uint32(msg);//获得处理函数标志，并调用处理函数switch(txn->code) {case HELLO_SVR_CMD_SAYHELLO:sayhello();return 0;case HELLO_SVR_CMD_SAYHELLO_TO:/* 从msg里取出字符串 */s = bio_get_string16(msg, &len);if (s == NULL) {return -1;}for (i = 0; i < len; i++)name[i] = s[i];name[i] = '\0';/* 处理 */i = sayhello_to(name);/* 把结果放入reply */bio_put_uint32(reply, i);break;default:fprintf(stderr, "unknown code %d\n", txn->code);return -1;}return 0;}int goodbye_service_handler(struct binder_state *bs,struct binder_transaction_data *txn,struct binder_io *msg,struct binder_io *reply){/* 根据txn->code知道要调用哪一个函数* 如果需要参数, 可以从msg取出* 如果要返回结果, 可以把结果放入reply*//* sayhello* sayhello_to*/uint16_t *s;char name[512];size_t len;uint32_t handle;uint32_t strict_policy;int i;// Equivalent to Parcel::enforceInterface(), reading the RPC// header with the strict mode policy mask and the interface name.// Note that we ignore the strict_policy and don't propagate it// further (since we do no outbound RPCs anyway).strict_policy = bio_get_uint32(msg);switch(txn->code) {case GOODBYE_SVR_CMD_SAYGOODBYE:saygoodbye();return 0;case GOODBYE_SVR_CMD_SAYGOODBYE_TO:/* 从msg里取出字符串 */s = bio_get_string16(msg, &len);if (s == NULL) {return -1;}for (i = 0; i < len; i++)name[i] = s[i];name[i] = '\0';/* 处理 */i = saygoodbye_to(name);/* 把结果放入reply */bio_put_uint32(reply, i);break;default:fprintf(stderr, "unknown code %d\n", txn->code);return -1;}return 0;}int test_server_handler(struct binder_state *bs,struct binder_transaction_data *txn,struct binder_io *msg,struct binder_io *reply){int (*handler)(struct binder_state *bs,struct binder_transaction_data *txn,struct binder_io *msg,struct binder_io *reply);  //构造处理方法handler = (int (*)(struct binder_state *bs,struct binder_transaction_data *txn,struct binder_io *msg,struct binder_io *reply))txn->target.ptr;  //根据txn->target.ptr返回处理相应方法return handler(bs, txn, msg, reply);  //返回所调用的处理方法}int main(int argc, char **argv){int fd;struct binder_state *bs;uint32_t svcmgr = BINDER_SERVICE_MANAGER;uint32_t handle;int ret;bs = binder_open(128*1024);  //打开Binder驱动设备if (!bs) {fprintf(stderr, "failed to open binder driver\n");return -1;}/* add service */ret = svcmgr_publish(bs, svcmgr, "hello", hello_service_handler);  //注册if (ret) {fprintf(stderr, "failed to publish hello service\n");return -1;}ret = svcmgr_publish(bs, svcmgr, "goodbye", goodbye_service_handler);if (ret) {fprintf(stderr, "failed to publish goodbye service\n");}#if 0while (1){/* read data *//* parse data, and process *//* reply */}#endifbinder_loop(bs, test_server_handler);  //从队列中取出响应的处理函数return 0;}

server.c

/* Copyright 2008 The Android Open Source Project*/#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <linux/types.h>#include<stdbool.h>#include <string.h>#include <private/android_filesystem_config.h>#include "binder.h"#include "test_server.h"uint32_t svcmgr_lookup(struct binder_state *bs, uint32_t target, const char *name){uint32_t handle;unsigned iodata[512/4];struct binder_io msg, reply;bio_init(&msg, iodata, sizeof(iodata), 4);bio_put_uint32(&msg, 0);  // strict mode headerbio_put_string16_x(&msg, SVC_MGR_NAME);bio_put_string16_x(&msg, name);if (binder_call(bs, &msg, &reply, target, SVC_MGR_CHECK_SERVICE))return 0;handle = bio_get_ref(&reply);if (handle)binder_acquire(bs, handle);binder_done(bs, &msg, &reply);return handle;}struct binder_state *g_bs;uint32_t g_hello_handle;uint32_t g_goodbye_handle;void sayhello(void){unsigned iodata[512/4];struct binder_io msg, reply;/* 构造binder_io */bio_init(&msg, iodata, sizeof(iodata), 4);bio_put_uint32(&msg, 0);  // strict mode header/* 放入参数 *//* 调用binder_call */if (binder_call(g_bs, &msg, &reply, g_hello_handle, HELLO_SVR_CMD_SAYHELLO))return ;/* 从reply中解析出返回值 */binder_done(g_bs, &msg, &reply);}int sayhello_to(char *name){unsigned iodata[512/4];struct binder_io msg, reply;int ret;/* 构造binder_io */bio_init(&msg, iodata, sizeof(iodata), 4);bio_put_uint32(&msg, 0);  // strict mode header/* 放入参数 */bio_put_string16_x(&msg, name);/* 调用binder_call */if (binder_call(g_bs, &msg, &reply, g_hello_handle, HELLO_SVR_CMD_SAYHELLO_TO))return 0;/* 从reply中解析出返回值 */ret = bio_get_uint32(&reply);binder_done(g_bs, &msg, &reply);return ret;}void saygoodbye(void){unsigned iodata[512/4];struct binder_io msg, reply;/* 构造binder_io */bio_init(&msg, iodata, sizeof(iodata), 4);bio_put_uint32(&msg, 0);  // strict mode header/* 放入参数 *//* 调用binder_call */if (binder_call(g_bs, &msg, &reply, g_goodbye_handle, GOODBYE_SVR_CMD_SAYGOODBYE))return ;/* 从reply中解析出返回值 */binder_done(g_bs, &msg, &reply);}int saygoodbye_to(char *name){unsigned iodata[512/4];struct binder_io msg, reply;int ret;/* 构造binder_io */bio_init(&msg, iodata, sizeof(iodata), 4);bio_put_uint32(&msg, 0);  // strict mode header/* 放入参数 */bio_put_string16_x(&msg, name);/* 调用binder_call */if (binder_call(g_bs, &msg, &reply, g_goodbye_handle, GOODBYE_SVR_CMD_SAYGOODBYE_TO))return 0;/* 从reply中解析出返回值 */ret = bio_get_uint32(&reply);binder_done(g_bs, &msg, &reply);return ret;}/* ./test_client hello* ./test_client hello <name>*/int main(int argc, char **argv){int fd;struct binder_state *bs;uint32_t svcmgr = BINDER_SERVICE_MANAGER;uint32_t handle;int ret;if (argc < 2){fprintf(stderr, "Usage:\n");fprintf(stderr, "%s <hello|goodbye>\n", argv[0]);fprintf(stderr, "%s <hello|goodbye> <name>\n", argv[0]);return -1;}bs = binder_open(128*1024);  //打开Binder驱动设备if (!bs) {fprintf(stderr, "failed to open binder driver\n");return -1;}g_bs = bs;/* get service */handle = svcmgr_lookup(bs, svcmgr, "goodbye");  //查找获取服务的引用if (!handle) {fprintf(stderr, "failed to get goodbye service\n");return -1;}g_goodbye_handle = handle;fprintf(stderr, "Handle for goodbye service = %d\n", g_goodbye_handle);handle = svcmgr_lookup(bs, svcmgr, "hello");if (!handle) {fprintf(stderr, "failed to get hello service\n");return -1;}g_hello_handle = handle;fprintf(stderr, "Handle for hello service = %d\n", g_hello_handle);/* send data to server */if (!strcmp(argv[1], "hello")){if (argc == 2) {sayhello();} else if (argc == 3) {ret = sayhello_to(argv[2]);fprintf(stderr, "get ret of sayhello_to = %d\n", ret);      }} else if (!strcmp(argv[1], "goodbye")){if (argc == 2) {saygoodbye();} else if (argc == 3) {ret = saygoodbye_to(argv[2]);fprintf(stderr, "get ret of sayhello_to = %d\n", ret);      }}binder_release(bs, handle);  //释放binder_acquire(bs, handle);return 0;}