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/* Copyright (c) 2016-2025. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include <cerrno>
#include <system_error>
#ifndef SIMGRID_MC_SYSTEM_ERROR_HPP
#define SIMGRID_MC_SYSTEM_ERROR_HPP
namespace simgrid::xbt {
/** A `error_category` suitable to be used with `errno`
*
* It is not clear which error we are supposed to generate
* when getting an errno:
*
* * `system_error` clearly cannot be used for this on Windows;
*
* * `generic_error` might not be used for non-standard `errno`.
*
* Let's just define a function which gives us the correct
* category.
*/
inline
const std::error_category& errno_category() noexcept
{
return std::generic_category();
}
/** Create a `error_code` from an `errno` value
*
* This is expected to to whatever is right to create a
* `error_code` from a given `errno` value.
*/
inline
std::error_code errno_code(int errnum)
{
return std::error_code(errnum, errno_category());
}
/** Create an `error_code` from `errno` (and clear it) */
inline
std::error_code errno_code()
{
int errnum = errno;
errno = 0;
return errno_code(errnum);
}
/** Create a `system_error` from an `errno` value
*
* This is expected to to whatever is right to create a
* `system_error` from a given `errno` value.
*/
inline
std::system_error errno_error(int errnum)
{
return std::system_error(errno_code(errnum));
}
inline
std::system_error errno_error(int errnum, const char* what)
{
return std::system_error(errno_code(errnum), what);
}
/** Create a `system_code` from `errno` (and clear it) */
inline
std::system_error errno_error()
{
return std::system_error(errno_code());
}
inline
std::system_error errno_error(const char* what)
{
return std::system_error(errno_code(), what);
}
} // namespace simgrid::xbt
#endif
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