Diff: libuavcan_drivers/linux/include/uavcan_linux/exception.hpp

Revision:

0:dfe6edabb8ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libuavcan_drivers/linux/include/uavcan_linux/exception.hpp	Sat Apr 14 10:25:32 2018 +0000
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
+ */
+
+#pragma once
+
+#include <cerrno>
+#include <cstring>
+#include <stdexcept>
+
+namespace uavcan_linux
+{
+/**
+ * This is the root exception class for all exceptions that can be thrown from the libuavcan Linux driver.
+ */
+class Exception : public std::runtime_error
+{
+    const int errno_;
+
+    static std::string makeErrorString(const std::string& descr, int use_errno)
+    {
+        return descr + " [errno " + std::to_string(use_errno) + " \"" + std::strerror(use_errno) + "\"]";
+    }
+
+public:
+    explicit Exception(const std::string& descr, int use_errno = errno)
+        : std::runtime_error(makeErrorString(descr, use_errno))
+        , errno_(use_errno)
+    { }
+
+    /**
+     * Returns standard UNIX errno value captured at the moment
+     * when this exception object was constructed.
+     */
+    int getErrno() const { return errno_; }
+};
+
+/**
+ * This type is thrown when a Libuavcan API method exits with error.
+ * The error code is stored in the exception object and is avialable via @ref getLibuavcanErrorCode().
+ */
+class LibuavcanErrorException : public Exception
+{
+    const std::int16_t error_;
+
+    static std::string makeErrorString(std::int16_t e)
+    {
+        return "Libuavcan error (" + std::to_string(e) + ")";
+    }
+
+public:
+    explicit LibuavcanErrorException(std::int16_t uavcan_error_code) :
+        Exception(makeErrorString(uavcan_error_code)),
+        error_(std::abs(uavcan_error_code))
+    { }
+
+    std::int16_t getLibuavcanErrorCode() const { return error_; }
+};
+
+/**
+ * This exception is thrown when all available interfaces become down.
+ */
+class AllIfacesDownException : public Exception
+{
+public:
+    AllIfacesDownException() : Exception("All ifaces are down", ENETDOWN) { }
+};
+
+}