service.cpp(查看服务)

https://blog.csdn.net/a572423926/article/details/126551079
源码位置：frameworks/native/cmds/service/service.cpp

main方法

 94     sp<IServiceManager> sm = defaultServiceManager();
 ...

104         if (strcmp(argv[optind], "check") == 0) {
105             optind++;
106             if (optind < argc) {
107                 sp<IBinder> service = sm->checkService(String16(argv[optind]));
108                 aout << "Service " << argv[optind] <<
109                     (service == nullptr ? ": not found" : ": found") << endl;
110             } else {
111                 aerr << "service: No service specified for check" << endl;
112                 wantsUsage = true;
113                 result = 10;
114             }
115         }
116         else if (strcmp(argv[optind], "list") == 0) {
117             Vector<String16> services = sm->listServices();
118             aout << "Found " << services.size() << " services:" << endl;
119             for (unsigned i = 0; i < services.size(); i++) {
120                 String16 name = services[i];
121                 sp<IBinder> service = sm->checkService(name);
122                 aout << i
123                      << "\t" << good_old_string(name)
124                      << ": [" << good_old_string(get_interface_name(service)) << "]"
125                      << endl;
126             }
127         }
...

→defaultServiceManager()
见https://blog.csdn.net/tkwxty/article/details/103034523
源码位置：frameworks/native/libs/binder/IServiceManager.cpp

最终获取的其实是：
gDefaultServiceManager = new BpServiceManager(new BpBinder(0));