throw_error.cpp

#include "throw_error.h"

#include "errno.h"
#include <cstring>
#include <sstream>
#include <stdexcept>

namespace
{
 char const* error_enum_name(int err)
 {
 switch (err)
 {
 case EBADF:
 return "EBADF";
 case EAGAIN:
 return "EAGAIN";
 case EACCES:
 return "EACCES";
 case EINVAL:
 return "EINVAL";
 case EMFILE:
 return "EMFILE";
 case EPIPE:
 return "EPIPE";
 case EADDRINUSE:
 return "EADDRINUSE";
 case EADDRNOTAVAIL:
 return "EADDRNOTAVAIL";
 case ECONNRESET:
 return "ECONNRESET";
 case ECONNREFUSED:
 return "ECONNREFUSED";
 }

 return "<unknown error>";
 }
}

void throw_error [[noreturn]] (int err, char const* action)
{
 std::stringstream ss;
 ss << action << " failed, error: " << error_enum_name(err);
 char tmp[2048];
 char const* err_msg = strerror_r(err, tmp, sizeof tmp);
 ss << " (" << err << ", " << err_msg << ")";
 throw std::runtime_error(ss.str());
}