reworked watchdog

bsp_q7s/core/WatchdogHandler.cpp

@@ -0,0 +1,84 @@
+#include "WatchdogHandler.h"
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <cerrno>
+#include <cstring>
+#include <filesystem>
+
+#include "fsfw/serviceinterface.h"
+#include "watchdog/definitions.h"
+
+WatchdogHandler::WatchdogHandler() {}
+
+void WatchdogHandler::periodicOperation() {
+  if (watchdogFifoFd != 0) {
+    if (watchdogFifoFd == RETRY_FIFO_OPEN) {
+      // Open FIFO write only and non-blocking
+      watchdogFifoFd = open(watchdog::FIFO_NAME.c_str(), O_WRONLY | O_NONBLOCK);
+      if (watchdogFifoFd < 0) {
+        if (errno == ENXIO) {
+          watchdogFifoFd = RETRY_FIFO_OPEN;
+          // No printout for now, would be spam
+          return;
+        } else {
+          sif::error << "Opening pipe " << watchdog::FIFO_NAME << " write-only failed with "
+                     << errno << ": " << strerror(errno) << std::endl;
+          return;
+        }
+      }
+      sif::info << "Opened " << watchdog::FIFO_NAME << " successfully" << std::endl;
+      performStartHandling();
+    } else if (watchdogFifoFd > 0) {
+      // Write to OBSW watchdog FIFO here
+      const char writeChar = watchdog::first::IDLE_CHAR;
+      ssize_t writtenBytes = write(watchdogFifoFd, &writeChar, 1);
+      if (writtenBytes < 0) {
+        sif::error << "Errors writing to watchdog FIFO, code " << errno << ": " << strerror(errno)
+                   << std::endl;
+      }
+    }
+  }
+}
+
+ReturnValue_t WatchdogHandler::initialize(bool enableWatchdogFunction) {
+  using namespace std::filesystem;
+  this->enableWatchFunction = enableWatchdogFunction;
+  if (not std::filesystem::exists(watchdog::FIFO_NAME)) {
+    // Still return returnvalue::OK for now
+    sif::info << "Watchdog FIFO " << watchdog::FIFO_NAME << " does not exist, can't initiate"
+              << " watchdog" << std::endl;
+    return returnvalue::OK;
+  }
+  // Open FIFO write only and non-blocking to prevent SW from killing itself.
+  watchdogFifoFd = open(watchdog::FIFO_NAME.c_str(), O_WRONLY | O_NONBLOCK);
+  if (watchdogFifoFd < 0) {
+    if (errno == ENXIO) {
+      watchdogFifoFd = RETRY_FIFO_OPEN;
+      sif::info << "eive-watchdog not running. FIFO can not be opened" << std::endl;
+    } else {
+      sif::error << "Opening pipe " << watchdog::FIFO_NAME << " write-only failed with " << errno
+                 << ": " << strerror(errno) << std::endl;
+      return returnvalue::FAILED;
+    }
+  }
+  return performStartHandling();
+}
+
+ReturnValue_t WatchdogHandler::performStartHandling() {
+  char startBuf[2];
+  size_t writeLen = 1;
+  startBuf[0] = watchdog::first::START_CHAR;
+  if (enableWatchFunction) {
+    writeLen += 1;
+    startBuf[1] = watchdog::second::WATCH_FLAG;
+  }
+  ssize_t writtenBytes = write(watchdogFifoFd, &startBuf, writeLen);
+  if (writtenBytes < 0) {
+    sif::error << "Errors writing to watchdog FIFO, code " << errno << ": " << strerror(errno)
+               << std::endl;
+    return returnvalue::FAILED;
+  }
+  return returnvalue::OK;
+}