/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "pg_config.h"
#include "socket.h"
#include <stdio.h>
#include <syslog.h>

/*
 * Open a pipe to a shell command. The command should have the
 * same uid/gid as the process writing onto the slave side.
 * Since we store the pipe's FILE structure pointer in a static
 * variable, there can't be more than one pipe open at the same
 * time.
 */

static  FILE *pipef= NULL;

int
connect_pipe(const char *address)
{
  DBG(syslog(LOG_DEBUG, "opening pipe to '%s'", address));
  
  if( pipef != NULL )
    {
      syslog(LOG_ERR, "another pipe is already open");
      return FAIL;
    }

  pipef = popen(address, "w");
  if (pipef == NULL)
    {
      syslog(LOG_ERR, "popen: %m");
      return FAIL;
    }
  
  /*
   * Since I don't need stream semantics extract the file
   * descriptor of the pipe here.
   */
  return fileno(pipef);
}

result
shutdown_pipe(int pfd)
{
  if(pipef == NULL)
    {
      syslog(LOG_WARNING, "no pipe to shut down");		  
      return SUCCESS;
    }

  if (pclose(pipef) == FAIL)
    {
      syslog(LOG_ERR, "pclose: %m");		  
      pipef = NULL;
      return FAIL;
    }

  pipef = NULL;
  return SUCCESS;
}