/*

  Copyright 2008 Nathan Phillip Brink, Ethan Zonca

  This file is a part of DistRen.

  DistRen is free software: you can redistribute it and/or modify

  it under the terms of the GNU Affero General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  DistRen 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License

  along with DistRen.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef _DISTREN_EXECIO_H

#define _DISTREN_EXECIO_H

/*

  This file tries to abstract away getting a socket/fd that talks to a spawned program

 */

#include <unistd.h>

enum execio_state

  {

    EXECIO_STATE_ERROR,

    EXECIO_STATE_EOF

  };

struct execio

{

  int pipe_write;

  int pipe_read;

  pid_t child;

};

/* nonzsero return on error */

/* 

   blocks, 

   returns 0 if len is 0. Otherwise, only returns 0 on error/EOF: use execio_state() to determine

*/

size_t execio_read(struct execio *eio, void *buf, size_t len);

size_t execio_write(struct execio *eio, void *buf, size_t len);

enum execio_state execio_state(struct execio *eio);

/* nonzero return on error */

int execio_close(struct execio *eio);

#endif