#ifndef EMACS_W32_H
#define EMACS_W32_H

/* Support routines for the NT version of Emacs.
   Copyright (C) 1994, 2001, 2002, 2003, 2004, 2005,
                 2006, 2007, 2008, 2009, 2010  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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */


/* 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;
  HANDLE                char_avail;
  HANDLE                char_consumed;
  HANDLE                thrd;
  HWND                  hwnd;
  PROCESS_INFORMATION   procinfo;
  volatile int          status;
  char                  chr;
  OVERLAPPED            ovl_read;
  OVERLAPPED            ovl_write;
} 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_LISTEN		0x0004
#define FILE_BINARY             0x0010
#define FILE_LAST_CR            0x0020
#define FILE_AT_EOF             0x0040
#define FILE_SEND_SIGCHLD       0x0080
#define FILE_PIPE               0x0100
#define FILE_SOCKET             0x0200
#define FILE_NDELAY             0x0400
#define FILE_SERIAL             0x0800

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

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

/* Equivalent of strerror for W32 error codes.  */
extern char * w32_strerror (int error_no);

/* Validate a pointer.  */
extern int w32_valid_pointer_p (void *, int);

/* Get long (aka "true") form of file name, if it exists.  */
extern BOOL w32_get_long_filename (char * name, char * buf, int size);

/* 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 (void);
extern void term_ntproc (void);
extern void globals_of_w32 (void);
extern void syms_of_w32term (void);
extern void syms_of_w32fns (void);
extern void globals_of_w32fns (void);
extern void syms_of_w32select (void);
extern void globals_of_w32select (void);
extern void term_w32select (void);
extern void syms_of_w32menu (void);
extern void globals_of_w32menu (void);
extern void syms_of_fontset (void);

extern int _sys_read_ahead (int fd);
extern int _sys_wait_accept (int fd);

#endif /* EMACS_W32_H */

/* arch-tag: 02c36b00-312b-4c4d-a1d9-f905c5e968f0
   (do not change this comment) */
