/*

    mtr  --  a network diagnostic tool

    Copyright (C) 2016  Matt Kimball

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License version 2 as

    published by the Free Software Foundation.

    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.

*/

#ifndef COMMAND_CYGWIN_H

#define COMMAND_CYGWIN_H

/*

    Though Cygwin supports the usual Unix non-blocking reads on

    the command stream, we've got to use Overlapped I/O instead because

    ICMP.DLL's support for sending probes requires Overlapped I/O

    and alertable waits for notification of replies.  Since we need

    alertable waits, we can't use Cygwin's select to determine when

    command stream data is available, but Overlapped I/O completion

    will work.

*/

/*  Overlapped I/O manament for Windows command buffer reads  */

struct command_buffer_platform_t {

    /*  true if an overlapped I/O read is active  */

    bool read_active;

    /*  true if the command pipe is still open  */

    bool pipe_open;

    /*  Windows OVERLAPPED I/O data  */

    OVERLAPPED overlapped;

    /*  The buffer which active OVERLAPPED reads read into  */

    char overlapped_buffer[COMMAND_BUFFER_SIZE];

};

struct command_buffer_t;

void start_read_command(

    struct command_buffer_t *buffer);

#endif