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Date:	Thu, 21 Jul 2011 23:43:23 +0200
From:	Marco atzeri <marco DOT atzeri AT gmail DOT com>
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To:	cygwin <cygwin AT cygwin DOT com>
Subject:	SIGHUP on pty closure
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looking on the mc subshell issue, I found that mc
suppose that the subshell will receive a SIGHUP
when mc exit and close the master side of pty.

Is such assumption wrong or it is a missing piece of
cygwin pty implementation ?



------------- extract from subshell.c --------------
     /* Attach all our standard file descriptors to the pty */

     /* This is done just before the fork, because stderr must still      */
     /* be connected to the real tty during the above error messages; */
     /* otherwise the user will never see them.                   */

     dup2 (subshell_pty_slave, STDIN_FILENO);
     dup2 (subshell_pty_slave, STDOUT_FILENO);
     dup2 (subshell_pty_slave, STDERR_FILENO);

     close (subshell_pipe[READ]);
     close (subshell_pty_slave); /* These may be FD_CLOEXEC, but just in 
case... */
     /* Close master side of pty.  This is important; apart from */
     /* freeing up the descriptor for use in the subshell, it also       */
     /* means that when MC exits, the subshell will get a SIGHUP and     */
     /* exit too, because there will be no more descriptors pointing     */
     /* at the master side of the pty and so it will disappear.  */
     close (subshell_pty);

     /* Execute the subshell at last */

     switch (subshell_type)
     {
     case BASH:
         execl (shell, "bash", "-rcfile", init_file, (char *) NULL);
         break;
----------------------------------------------------------

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