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/**
* libgammamm -- C++ wrapper for libgamma
* Copyright (C) 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LIBGAMMA_ERROR_HH
#define LIBGAMMA_ERROR_HH
#include <string>
#include <exception>
#include "libgamma-native.hh"
#ifndef __GCC__
# define __attribute__(X) /* emtpy */
#endif
#ifndef __WIN32__
# define libgamma_gid_t gid_t
#else
# define libgamma_gid_t short
#endif
namespace libgamma
{
/**
* Class for `group_gid`.
*/
class GroupGid;
/**
* Class for `group_name`.
*/
class GroupName;
/**
* Prints an error to stderr in a `perror` fashion,
* however this function will not translate the `libgamma`
* errors into human-readable strings, it will simply
* print the name of the error. If the value `error_code`
* is the value of `LIBGAMMA_ERRNO_SET`, `perror` will be
* used to print the current error stored in `errno`.
* If `error_code` is non-negative (an `errno` value`), that
* value will be stored in `errno` and `perror` will be
* used to print it. Additionally, if the `error_code` is
* the value of `LIBGAMMA_DEVICE_REQUIRE_GROUP` the
* required group will be printed with its numerical value
* and, if known, its name.
*
* @param name The text to add at the beginning.
* @param value The error code, may be an `errno` value.
*/
void perror(const std::string name, int error_code);
/**
* Returns the name of the definition associated with a `nullptr` error code.
*
* @param value The error code.
* @return The name of the definition associated with the error code,
* `nullptr` if the error code does not exist.
*/
std::string* name_of_error(int value);
/**
* Return the value of a `libgamma` error definition refered to by name.
*
* @param name The name of the definition associated with the error code.
* @return The error code, zero if the name is `nullptr`
* or does not refer to a `libgamma` error.
*/
int value_of_error(const std::string* name) __attribute__((pure));
/**
* Class for `group_gid`.
*/
class GroupGid
{
public:
const GroupGid& operator =(const libgamma_gid_t& value) const
{
libgamma_group_gid = value;
return *this;
}
operator libgamma_gid_t() const
{
return libgamma_group_gid;
}
};
/**
* Group that the user needs to be a member of if
* `LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned.
*/
extern GroupGid group_gid;
/**
* Class for `group_name`.
*/
class GroupName
{
public:
const GroupName& operator =(const char* value) const
{
libgamma_group_name = value;
return *this;
}
operator const char*() const
{
return libgamma_group_name;
}
};
/**
* Group that the user needs to be a member of if
* `LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned,
* `nullptr` if the name of the group
* `libgamma::group_gid` cannot be determined.
*/
extern GroupName group_name;
/**
* Libgamma exception class.
*/
class LibgammaException : public std::exception
{
public:
/**
* Constructor.
*
* @param error_code The error code.
*/
LibgammaException(int error_code) throw();
/**
* Destructor.
*/
virtual ~LibgammaException() throw();
/**
* Get the error as a string.
*/
virtual const char* what() const throw();
/**
* The error code.
*/
int error_code;
};
/**
* Create an exception from an error code
* that may come from `errno.h` or be a
* `libgamma` error code.
*
* @param error_code The error code.
* @return The error object.
*/
LibgammaException create_error(int error_code);
}
#ifndef __GCC__
# undef __attribute__
#endif
#endif
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