#ifndef _NT_H_
#define _NT_H_

/* Support routines for the NT version of Emacs.
   Copyright (C) 1994 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs 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, or (at your option)
any later version.

GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* #define FULL_DEBUG */
#define EMACSDEBUG

#ifdef EMACSDEBUG
#define DebPrint(stuff) _DebPrint stuff
#else
#define DebPrint(stuff)
#endif

/* File descriptor set emulation.  */

/* MSVC runtime library has limit of 64 descriptors by default */
#define FD_SETSIZE  64
typedef struct {
  unsigned int bits[FD_SETSIZE / 32];
} fd_set;

/* standard access macros */
#define FD_SET(n, p) \
  do { \
    if ((n) < FD_SETSIZE) { \
      (p)->bits[(n)/32] |= (1 << (n)%32); \
    } \
  } while (0)
#define FD_CLR(n, p) \
  do { \
    if ((n) < FD_SETSIZE) { \
      (p)->bits[(n)/32] &= ~(1 << (n)%32); \
    } \
  } while (0)
#define FD_ISSET(n, p) ((n) < FD_SETSIZE ? ((p)->bits[(n)/32] & (1 << (n)%32)) : 0)
#define FD_ZERO(p) memset((p), 0, sizeof(fd_set))

#define SELECT_TYPE fd_set

/* ------------------------------------------------------------------------- */

/* child_process.status values */
enum {
  STATUS_READ_ERROR = -1,
  STATUS_READ_READY,
  STATUS_READ_IN_PROGRESS,
  STATUS_READ_FAILED,
  STATUS_READ_SUCCEEDED,
  STATUS_READ_ACKNOWLEDGED
};

/* This structure is used for both pipes and sockets; for
   a socket, the process handle in pi is NULL. */
typedef struct _child_process
{
  int                   fd;
  int                   pid;
  int                   is_dos_process;
  HANDLE                char_avail;
  HANDLE                char_consumed;
  HANDLE                thrd;
  PROCESS_INFORMATION   procinfo;
  volatile int          status;
  char                  chr;
} child_process;

#define MAXDESC FD_SETSIZE
#define MAX_CHILDREN  MAXDESC/2
#define CHILD_ACTIVE(cp) ((cp)->char_avail != NULL)

/* parallel array of private info on file handles */
typedef struct
{
  unsigned         flags;
  HANDLE           hnd;
  child_process *  cp;
} filedesc;

extern filedesc fd_info [ MAXDESC ];

/* fd_info flag definitions */
#define FILE_READ    0x0001
#define FILE_WRITE   0x0002
#define FILE_BINARY  0x0010
#define FILE_PIPE    0x0100
#define FILE_SOCKET  0x0200

extern child_process * new_child (void);
extern void delete_child (child_process *cp);

/* ------------------------------------------------------------------------- */


/* Prepare our standard handles for proper inheritance by child processes.  */
extern void prepare_standard_handles (int in, int out, 
				      int err, HANDLE handles[4]);

/* Reset our standard handles to their original state.  */
extern void reset_standard_handles (int in, int out, 
				    int err, HANDLE handles[4]);

/* Return the string resource associated with KEY of type TYPE.  */
extern LPBYTE w32_get_resource (char * key, LPDWORD type);

extern void init_ntproc ();
extern void term_ntproc ();

#endif /* _NT_H_ */