1 /** 2 * Copyright © 2016 IBM Corporation 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 "argument.hpp" 18 #include "monitor.hpp" 19 20 #include <systemd/sd-event.h> 21 22 #include <iostream> 23 #include <phosphor-logging/log.hpp> 24 #include <string> 25 26 using namespace phosphor::logging; 27 static void exitWithError(const char* err, char** argv) 28 { 29 phosphor::gpio::ArgumentParser::usage(argv); 30 std::cerr << "ERROR: " << err << "\n"; 31 exit(EXIT_FAILURE); 32 } 33 34 int main(int argc, char** argv) 35 { 36 // Read arguments. 37 auto options = phosphor::gpio::ArgumentParser(argc, argv); 38 39 // Parse out path argument. 40 auto path = (options)["path"]; 41 if (path == phosphor::gpio::ArgumentParser::emptyString) 42 { 43 exitWithError("path not specified.", argv); 44 } 45 46 // Parse out key number that we are interested in 47 // Its integer mapping to the GPIO key configured by the kernel 48 auto key = (options)["key"]; 49 if (key == phosphor::gpio::ArgumentParser::emptyString) 50 { 51 exitWithError("Key not specified.", argv); 52 } 53 54 // Parse out assertion polarity interested in 55 // Its either 1 or 0 for press / release 56 auto polarity = (options)["polarity"]; 57 if (polarity == phosphor::gpio::ArgumentParser::emptyString) 58 { 59 exitWithError("Polarity not specified.", argv); 60 } 61 62 // Parse out target argument. It is fine if the caller does not 63 // pass this if they are not interested in calling into any target 64 // on meeting a condition. 65 auto target = (options)["target"]; 66 67 bool continueRun = 68 (options["continue"] == phosphor::gpio::ArgumentParser::trueString); 69 70 sd_event* event = nullptr; 71 auto r = sd_event_default(&event); 72 if (r < 0) 73 { 74 log<level::ERR>("Error creating a default sd_event handler"); 75 return r; 76 } 77 phosphor::gpio::EventPtr eventP{event}; 78 event = nullptr; 79 80 // Create a monitor object and let it do all the rest 81 phosphor::gpio::Monitor monitor(path, std::stoi(key), std::stoi(polarity), 82 target, eventP, continueRun); 83 84 // Wait for client requests until this application has processed 85 // at least one expected GPIO state change 86 while (!monitor.completed()) 87 { 88 // -1 denotes wait for ever 89 r = sd_event_run(eventP.get(), (uint64_t)-1); 90 if (r < 0) 91 { 92 log<level::ERR>("Failure in processing request", 93 entry("ERROR=%s", strerror(-r))); 94 break; 95 } 96 } 97 98 return 0; 99 } 100