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 <cstdint> 18 #include <cstdio> 19 #include <filesystem> 20 #include <lpcsnoop/snoop_listen.hpp> 21 #include <string> 22 23 namespace fs = std::filesystem; 24 25 static void DisplayDbusValue(FILE* f, postcode_t postcodes) 26 { 27 auto postcode = std::get<primary_post_code_t>(postcodes); 28 // Uses cstdio instead of streams because the device file has 29 // very strict requirements about the data format and streaming 30 // abstractions tend to muck it up. 31 if (f) 32 { 33 int rc = std::fprintf(f, "%d%02x\n", (postcode > 0xff), 34 static_cast<uint8_t>(postcode & 0xff)); 35 if (rc < 0) 36 { 37 std::fprintf(stderr, "failed to write 7seg value: rc=%d\n", rc); 38 } 39 std::fflush(f); 40 } 41 } 42 43 /* 44 * This is the entry point for the application. 45 * 46 * This application simply creates an object that registers for incoming value 47 * updates for the POST code dbus object. 48 */ 49 int main(int argc, const char* argv[]) 50 { 51 if (argc != 2 || !fs::exists(argv[1])) 52 { 53 std::fprintf(stderr, "usage: %s <device_node>\n", argv[0]); 54 return -1; 55 } 56 57 static bool sig_recv = false; 58 FILE* f = std::fopen(argv[1], "r+"); 59 60 auto ListenBus = sdbusplus::bus::new_default(); 61 std::unique_ptr<lpcsnoop::SnoopListen> snoop = 62 std::make_unique<lpcsnoop::SnoopListen>(ListenBus, DisplayDbusValue, f); 63 64 signal(SIGINT, [](int signum) { 65 if (signum == SIGINT) 66 { 67 sig_recv = true; 68 } 69 }); 70 71 while (!sig_recv) 72 { 73 ListenBus.process_discard(); 74 ListenBus.wait(); 75 } 76 77 std::fclose(f); 78 return 0; 79 } 80