// $Id$
//
// Copyright (C) 2006
-// Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
-// Kompetenzzentrum fuer Satelitenkommunikation (SatCom)
-// Stefan Bund <stefan.bund@fokus.fraunhofer.de>
+// Fraunhofer Institute for Open Communication Systems (FOKUS)
+// Competence Center NETwork research (NET), St. Augustin, GERMANY
+// Stefan Bund <g0dil@berlios.de>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// Custom includes
#include <exception>
#include <string>
+#include <iostream>
+#include <sstream>
#include <boost/preprocessor/repeat.hpp>
#include <boost/preprocessor/cat.hpp>
+#include <boost/utility.hpp>
//#include "Exception.mpp"
///////////////////////////////hh.p////////////////////////////////////////
/** \brief Exception handling standard UNIX errors (errno)
- This exception is thrown to signal generic \c errno failures. In addition to the \c errno
- number (the code()), this class manages optional origin information. This parameter should
- be provided to further describe, in what context the exception was created.
+ This exception is thrown to signal generic \c errno failures.
- This exception should not be used directly. Instead the derived class ErrnoException should
- be thrown via one of the senf::throwErrno() helpers.
+ This exception cannot be thrown directly. Instead the derived class ErrnoException should be
+ thrown via one of the senf::throwErrno helpers.
+
+ The error message associated with the SystemException may be extended arbitrarily by using
+ the exception like a stream:
+ \code
+ try {
+ // This throw would normally be within some function called from here.
+ senf::throwErrno("::open()");
+
+ // Or you may want to use a more descriptive argument string:
+ senf::throwErrno("::open(\"" + filename + "\")");
+
+ // Or even use boost::format here
+ senf::throwErrno((boost::format("::open(\"%s\")") % filename).str());
+ }
+ catch (SystemException & e) {
+ // You can add further error information later by catching and re-throwing the exception
+ e << " [while operating on user '" << user << "']";
+ throw;
+ }
+ \endcode
\see ErrnoException
\ingroup exception
*/
- class SystemException : public std::exception
+ class SystemException : public std::exception, public std::stringstream
{
public:
- SystemException(); ///< SystemException without error location infor
- /**< The error code is taken from the current value of the
- global \c errno variable */
-
- explicit SystemException(int code); ///< SystemException without error location info
- /**< \param[in] code error number (the \c errno value) */
-
- explicit SystemException(char const * where); ///< SystemException with error location info
- /**< The error code is taken from the current value of the
- global \c errno variable
- \param[in] where description of error origin */
-
- SystemException(char const * where, int code); ///< SystemException with error location info
- /**< \param[in] where description of error origin
- \param[in] code error number (the \c errno value) */
-
virtual char const * what() const throw(); ///< Return verbose error description
- char const * where() const; ///< Error origin
- int code() const; ///< Error code (\c errno number)
+ int errorNumber() const; ///< Error code (\c errno number)
char const * description() const; ///< Error description (strerror() value)
bool anyOf(int c0, int c1=0, int c2=0, int c3=0, int c4=0, int c5=0,
int c6=0, int c7=0, int c8=0, int c9=0);
- ///< \c true, if code() is one of \a c0 ... \a c9
+ ///< \c true, if errorNumber() is one of \a c0 ... \a c9
virtual ~SystemException() throw();
- private:
- void init();
+ protected:
+ SystemException(std::string const & where, int code);
+ SystemException(SystemException const & other);
- char const * const where_;
+ private:
int const code_; // This must be const to make the derived ErrnoException
// class a valid derived class.
- std::string buffer_;
+ mutable std::string buffer_;
+
+ friend void throwErrno(std::string const &, int);
};
/** \brief Error specific system exception
if ((fd = ::open(filename, O_RDWR)) < 0)
senf::throwErrno("open()");
\endcode
+
+ \see SystemException
+
\ingroup exception
*/
template <int Code>
public:
static int const fixed_code = Code;
- ErrnoException(); ///< ErrnoException without error location information
- explicit ErrnoException(char const * where);
+ explicit ErrnoException(std::string const & where);
///< ErrnoException with error location information
+
+ ErrnoException(ErrnoException const & other);
};
/** \brief Throw ErrnoException based on current \c errno value (with location info)
\ingroup exception
*/
- void throwErrno(char const * where);
+ void throwErrno(std::string const & where);
/** \brief Throw ErrnoException based on given \c errno value
\ingroup exception
/** \brief Throw ErrnoException based on given \c errno value (with location info)
\ingroup exception
*/
- void throwErrno(char const * where, int code);
-
- enum NoThrow_t { nothrow };
+ void throwErrno(std::string const & where, int code);
}
projects / senf.git / blobdiff