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#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_ */
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