文件名称:
how the Android IPC system works
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文件大小: 92kb
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上传时间: 2011-04-13
详细说明： I will use call IAudioFlinger::setMode API as a sample scenario to show how the Android IPC system works. AudioFlinger is a service in the media_server program Service Manager Run service_manager provide service manager service to other process. It must be started before any other service gets running. int main(int argc, char **argv) { struct binder_state *bs; void *svcmgr = BINDER_SERVICE_MANAGER; bs = binder_open(128*1024); if (binder_become_context_manager(bs)) { LOGE("cannot become context manager (%s)\n", strerror (errno)); return -1; } svcmgr_handle = svcmgr; binder_loop(bs, svcmgr_handler); return 0; } It first open “/dev/binder” driver and then call BINDER_SET_CONTEXT_MGR ioctl to let binder kernel driver know it acts as a manager. Then it enters into a loop to wait for any data from other process. void binder_loop(struct binder_state *bs, binder_handler func) { int res; struct binder_write_read bwr; unsigned readbuf[32]; bwr.write_size = 0; bwr.write_consumed = 0; bwr.write_buffer = 0; readbuf[0] = BC_ENTER_LOOPER; binder_write(bs, readbuf, sizeof(unsigned)); for (;;) { bwr.read_size = sizeof(readbuf); bwr.read_consumed = 0; bwr.read_buffer = (unsigned) readbuf; ...展开收缩
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