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diff --git a/src/libgamma-error.hh b/src/libgamma-error.hh
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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>
+
+extern "C"
+{
+# include <libgamma-config.h>
+# include <libgamma-error.h>
+}
+
+
+namespace libgamma
+{
+  /**
+   * 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);
+  
+  
+  /* TODO libgamma_group_gid */
+  /* TODO libgamma_group_name */
+  
+}
+
+
+#endif
+