/*

 * lftp - file transfer program

 *

 * Copyright (c) 1996-2012 by Alexander V. Lukyanov (lav@yars.free.net)

 *

 * 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/>.

 */

#include <config.h>

#include <signal.h>

#include <unistd.h>

#include "trio.h"

#include "fg.h"

void FgData::cont()

{

   if(!pg)

      return;

   if(kill(-pg,SIGCONT)==-1)

      kill(pg,SIGCONT);

}

FgData::FgData(pid_t npg,bool fg)

{

   old_pgrp=0;

   pg=npg;

   if(!pg)

      return;

   if(fg)

      Fg();

   else

      cont();

}

FgData::~FgData()

{

   if(old_pgrp)

      Bg();

}

void FgData::Fg()

{

   if(!pg)

      return;

   pid_t tc_grp=tcgetpgrp(0);

   if(tc_grp==-1 || tc_grp==getpgrp())

   {

      old_pgrp=getpgrp();

#ifdef FG_DEBUG

      printf("fg: tcsetpgrp(%d)\n",(int)pg);

#endif

      tcsetpgrp(0,pg);

   }

   cont();

}

void FgData::Bg()

{

   if(old_pgrp)

   {

#ifdef FG_DEBUG

      printf("bg: tcsetpgrp(%d)\n",(int)old_pgrp);

#endif

      tcsetpgrp(0,old_pgrp);

      old_pgrp=0;

   }

}