目录:
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Android : 跟我学Binder --- (1) 什么是Binder IPC?为何要使用Binder机制?
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Android : 跟我学Binder --- (2) AIDL分析及手动实现
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Android : 跟我学Binder --- (3) C程序示例
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Android : 跟我学Binder --- (4) 驱动情景分析
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Android : 跟我学Binder --- (5) C++实现
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Android : 跟我学Binder --- (6) JAVA实现
一、数据结构
首先基于之前的c程序代码再添加一个goodbye服务,引入以下几个概念:
- binder_ref
- binder_node
- binder_proc
- binder_thread
- binder_buffer
1.test_server.c中实现goodbye服务处理函数:
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 */ /* saygoodbye * saygoodbye_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(); bio_put_uint32(reply, 0); /* no exception */ return 0; case GOODBYE_SVR_CMD_SAYGOODBYE_TO: /* 从msg里取出字符串(16位转8位) */ s = bio_get_string16(msg, &len); //"IGoodbyeService" s = bio_get_string16(msg, &len); // name if (s == NULL) { return -1; } for (i = 0; i < len; i++) name[i] = s[i]; name[i] = '