在函数里面：
int handle_host_request(char service, transport_type ttype, char serial, int reply_fd, asocket *s)
处理devices命令的代码：
// return a list of all connected devices
if (!strncmp(service, "devices", 7)) {
bool long_listing = (strcmp(service+7, "-l") == 0);
if (long_listing || service[7] == 0) {
D("Getting device list...\n");
std::string device_list = list_transports(long_listing);
D("Sending device list...\n");
SendOkay(reply_fd);
SendProtocolString(reply_fd, device_list);
return 0;
}
return 1;
}

给你打个调用栈：

#0 handle_host_request (service=0x5555556b8389 "devices", ttype=kTransportAny, serial=0x0, reply_fd=9, s=0x5555556b8020) at system/core/adb/adb.cpp:801
#1 0x000055555558598c in smart_socket_enqueue (s=0x5555556b8020, p=) at system/core/adb/sockets.cpp:771
#2 0x000055555558411f in local_socket_event_func (fd=, ev=1, _s=0x5555556b7f80) at system/core/adb/sockets.cpp:362
#3 0x000055555558c1d4 in fdevent_call_fdfunc (fde=) at system/core/adb/fdevent.cpp:510
#4 fdevent_loop () at system/core/adb/fdevent.cpp:692
#5 0x0000555555574225 in adb_main (is_daemon=, server_port=) at system/core/adb/adb_main.cpp:343
#6 0x0000555555574e35 in adb_commandline (argc=, argv=) at system/core/adb/commandline.cpp:1076
#7 0x00007ffff6ee6830 in __libc_start_main (main=0x555555574320 , argc=5, argv=0x7fffffffd838, init=, fini=,
rtld_fini=, stack_end=0x7fffffffd828) at ../csu/libc-start.c:291
#8 0x0000555555573c59 in _start ()

！！！！望采纳！！！！