path: root/src/mds-echo.h

/**
 * mds — A micro-display server
 * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
 * 
 * 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
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef MDS_MDS_ECHO_H
#define MDS_MDS_ECHO_H


#include "mds-base.h"


/**
 * Echo the received message
 * 
 * @return  Non-zero on error or interruption, errno will be
 *          set accordingly. Destroy the message on error,
 *          be aware that the reading could have been
 *          interrupted by a signal rather than canonical error.
 *          If -2 is returned errno will not have been set,
 *          -2 indicates that the message is malformated,
 *          which is a state that cannot be recovered from.
 */
int echo_message(void);


#endif