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
DisplayDbusValue(FILE * f,postcode_t postcodes)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 */
main(int argc,const char * argv[])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