From b3fa71dc1be5269620f1663fb7d5da5b1ce3ff31 Mon Sep 17 00:00:00 2001
From: Geoff Voelker <voelker@cs.washington.edu>
Date: Fri, 3 May 1996 18:33:20 +0000
Subject: [PATCH] Check to see if already included. (fd_set, filedesc): New
 structures. (child_process, MAX_CHILDREN, CHILD_ACTIVE): Definitions moved
 from ntproc.c. (FD_SET, FD_CLR, FD_ISSET, FD_ZERO): Operate on fd_set
 structures. (SELECT_TYPE): New macro. New child process status enumeration.
 (FILE_READ, FILE_WRITE, FILE_BINARY, FILE_PIPE, FILE_SOCKET): New macros.
 (fd_info, new_child, delete_child): Declared.

---
 src/w32.h | 108 +++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 90 insertions(+), 18 deletions(-)

diff --git a/src/w32.h b/src/w32.h
index 1512d7c12ce..3a185018cfc 100644
--- a/src/w32.h
+++ b/src/w32.h
@@ -1,3 +1,6 @@
+#ifndef _NT_H_
+#define _NT_H_
+
 /* Support routines for the NT version of Emacs.
    Copyright (C) 1994 Free Software Foundation, Inc.
 
@@ -18,28 +21,93 @@ 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.  */
 
-/* File descriptor set emulation.  */
+/* #define FULL_DEBUG */
+#define EMACSDEBUG
 
-#ifdef FD_SET
-/* We could get this from param.h, but better not to depend on finding that.
-   And better not to risk that it might define other symbols used in this
-   file.  */
-#ifdef FD_SETSIZE
-#define MAXDESC FD_SETSIZE
+#ifdef EMACSDEBUG
+#define DebPrint(stuff) _DebPrint stuff
 #else
-#define MAXDESC 64
+#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
-#else /* no FD_SET */
-#define MAXDESC 32
-#define SELECT_TYPE int
 
-/* Define the macros to access a single-int bitmap of descriptors.  */
-#define FD_SET(n, p) (*(p) |= (1 << (n)))
-#define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
-#define FD_ISSET(n, p) (*(p) & (1 << (n)))
-#define FD_ZERO(p) (*(p) = 0)
-#endif /* no 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;
+  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, 
@@ -50,5 +118,9 @@ 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 nt_get_resource (char *key, LPDWORD type);
+extern LPBYTE nt_get_resource (char * key, LPDWORD type);
+
+extern void init_ntproc ();
+extern void term_ntproc ();
 
+#endif /* _NT_H_ */
-- 
2.39.2