src/w32.h

   1 #ifndef EMACS_W32_H
   2 #define EMACS_W32_H
   3
   4 /* Support routines for the NT version of Emacs.
   5    Copyright (C) 1994 Free Software Foundation, Inc.
   6
   7 This file is part of GNU Emacs.
   8
   9 GNU Emacs is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU Emacs is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU Emacs; see the file COPYING.  If not, write to
  21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24
  25 /* File descriptor set emulation.  */
  26
  27 /* MSVC runtime library has limit of 64 descriptors by default */
  28 #define FD_SETSIZE  64
  29 typedef struct {
  30   unsigned int bits[FD_SETSIZE / 32];
  31 } fd_set;
  32
  33 /* standard access macros */
  34 #define FD_SET(n, p) \
  35   do { \
  36     if ((n) < FD_SETSIZE) { \
  37       (p)->bits[(n)/32] |= (1 << (n)%32); \
  38     } \
  39   } while (0)
  40 #define FD_CLR(n, p) \
  41   do { \
  42     if ((n) < FD_SETSIZE) { \
  43       (p)->bits[(n)/32] &= ~(1 << (n)%32); \
  44     } \
  45   } while (0)
  46 #define FD_ISSET(n, p) ((n) < FD_SETSIZE ? ((p)->bits[(n)/32] & (1 << (n)%32)) : 0)
  47 #define FD_ZERO(p) memset((p), 0, sizeof(fd_set))
  48
  49 #define SELECT_TYPE fd_set
  50
  51 /* ------------------------------------------------------------------------- */
  52
  53 /* child_process.status values */
  54 enum {
  55   STATUS_READ_ERROR = -1,
  56   STATUS_READ_READY,
  57   STATUS_READ_IN_PROGRESS,
  58   STATUS_READ_FAILED,
  59   STATUS_READ_SUCCEEDED,
  60   STATUS_READ_ACKNOWLEDGED
  61 };
  62
  63 /* This structure is used for both pipes and sockets; for
  64    a socket, the process handle in pi is NULL. */
  65 typedef struct _child_process
  66 {
  67   int                   fd;
  68   int                   pid;
  69   HANDLE                char_avail;
  70   HANDLE                char_consumed;
  71   HANDLE                thrd;
  72   HWND                  hwnd;
  73   PROCESS_INFORMATION   procinfo;
  74   volatile int          status;
  75   char                  chr;
  76 } child_process;
  77
  78 #define MAXDESC FD_SETSIZE
  79 #define MAX_CHILDREN  MAXDESC/2
  80 #define CHILD_ACTIVE(cp) ((cp)->char_avail != NULL)
  81
  82 /* parallel array of private info on file handles */
  83 typedef struct
  84 {
  85   unsigned         flags;
  86   HANDLE           hnd;
  87   child_process *  cp;
  88 } filedesc;
  89
  90 extern filedesc fd_info [ MAXDESC ];
  91
  92 /* fd_info flag definitions */
  93 #define FILE_READ               0x0001
  94 #define FILE_WRITE              0x0002
  95 #define FILE_BINARY             0x0010
  96 #define FILE_LAST_CR            0x0020
  97 #define FILE_AT_EOF             0x0040
  98 #define FILE_SEND_SIGCHLD       0x0080
  99 #define FILE_PIPE               0x0100
 100 #define FILE_SOCKET             0x0200
 101
 102 extern child_process * new_child (void);
 103 extern void delete_child (child_process *cp);
 104
 105 /* ------------------------------------------------------------------------- */
 106
 107 /* Equivalent of strerror for W32 error codes.  */
 108 extern char * w32_strerror (int error_no);
 109
 110 /* Get long (aka "true") form of file name, if it exists.  */
 111 extern BOOL w32_get_long_filename (char * name, char * buf, int size);
 112
 113 /* Prepare our standard handles for proper inheritance by child processes.  */
 114 extern void prepare_standard_handles (int in, int out,
 115                                       int err, HANDLE handles[4]);
 116
 117 /* Reset our standard handles to their original state.  */
 118 extern void reset_standard_handles (int in, int out,
 119                                     int err, HANDLE handles[4]);
 120
 121 /* Return the string resource associated with KEY of type TYPE.  */
 122 extern LPBYTE w32_get_resource (char * key, LPDWORD type);
 123
 124 extern void init_ntproc ();
 125 extern void term_ntproc ();
 126
 127 #endif /* EMACS_W32_H */