1 /** 2 * Copyright 2017 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <lpcsnoop/snoop_listen.hpp> 18 19 #include <cstdint> 20 #include <cstdio> 21 #include <filesystem> 22 #include <string> 23 24 namespace fs = std::filesystem; 25 26 static void DisplayDbusValue(FILE* f, postcode_t postcodes) 27 { 28 const auto& postcode = std::get<0>(postcodes); 29 // Uses cstdio instead of streams because the device file has 30 // very strict requirements about the data format and streaming 31 // abstractions tend to muck it up. 32 if (f && !postcode.empty()) 33 { 34 int rc = 35 std::fprintf(f, "%d%02x\n", postcode.size() > 1, postcode.back()); 36 if (rc < 0) 37 { 38 std::fprintf(stderr, "failed to write 7seg value: rc=%d\n", rc); 39 } 40 std::fflush(f); 41 } 42 } 43 44 /* 45 * This is the entry point for the application. 46 * 47 * This application simply creates an object that registers for incoming value 48 * updates for the POST code dbus object. 49 */ 50 int main(int argc, const char* argv[]) 51 { 52 if (argc != 2 || !fs::exists(argv[1])) 53 { 54 std::fprintf(stderr, "usage: %s <device_node>\n", argv[0]); 55 return -1; 56 } 57 58 static bool sig_recv = false; 59 FILE* f = std::fopen(argv[1], "r+"); 60 61 auto ListenBus = sdbusplus::bus::new_default(); 62 std::unique_ptr<lpcsnoop::SnoopListen> snoop = 63 std::make_unique<lpcsnoop::SnoopListen>(ListenBus, DisplayDbusValue, f); 64 65 signal(SIGINT, [](int signum) { 66 if (signum == SIGINT) 67 { 68 sig_recv = true; 69 } 70 }); 71 72 while (!sig_recv) 73 { 74 ListenBus.process_discard(); 75 ListenBus.wait(); 76 } 77 78 std::fclose(f); 79 return 0; 80 } 81