--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/process-nt.c	Mon Aug 13 11:28:15 2007 +0200
@@ -0,0 +1,1033 @@
+/* Asynchronous subprocess implementation for Win32
+   Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995
+   Free Software Foundation, Inc.
+   Copyright (C) 1995 Sun Microsystems, Inc.
+   Copyright (C) 1995, 1996 Ben Wing.
+
+This file is part of XEmacs.
+
+XEmacs 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.
+
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Written by Kirill M. Katsnelson <kkm@kis.ru>, April 1998 */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "hash.h"
+#include "lstream.h"
+#include "process.h"
+#include "procimpl.h"
+#include "sysdep.h"
+
+#include <windows.h>
+#ifndef __MINGW32__
+#include <shellapi.h>
+#else
+#include <errno.h>
+#endif
+#include <signal.h>
+#ifdef HAVE_SOCKETS
+#include <winsock.h>
+#endif
+
+/* Arbitrary size limit for code fragments passed to run_in_other_process */
+#define FRAGMENT_CODE_SIZE 32
+
+/* Bound by winnt.el */
+Lisp_Object Qnt_quote_process_args;
+
+/* Implementation-specific data. Pointed to by Lisp_Process->process_data */
+struct nt_process_data
+{
+  HANDLE h_process;
+};
+
+#define NT_DATA(p) ((struct nt_process_data*)((p)->process_data))
+
+/*-----------------------------------------------------------------------*/
+/* Process helpers							 */
+/*-----------------------------------------------------------------------*/
+
+/* This one breaks process abstraction. Prototype is in console-msw.h,
+   used by select_process method in event-msw.c */
+HANDLE
+get_nt_process_handle (struct Lisp_Process *p)
+{
+  return (NT_DATA (p)->h_process);
+}
+
+/*-----------------------------------------------------------------------*/
+/* Running remote threads. See Microsoft Systems Journal 1994 Number 5	 */
+/* Jeffrey Richter, Load Your 32-bit DLL into Another Process's Address..*/
+/*-----------------------------------------------------------------------*/
+
+typedef struct
+{
+  HANDLE h_process;
+  HANDLE h_thread;
+  LPVOID address;
+} process_memory;
+
+/*
+ * Allocate SIZE bytes in H_PROCESS address space. Fill in PMC used
+ * further by other routines. Return nonzero if successful.
+ *
+ * The memory in other process is allocated by creating a suspended
+ * thread. Initial stack of that thread is used as the memory
+ * block. The thread entry point is the routine ExitThread in
+ * kernel32.dll, so the allocated memory is freed just by resuming the 
+ * thread, which immediately terminates after that.
+ */
+
+static int 
+alloc_process_memory (HANDLE h_process, size_t size,
+		      process_memory* pmc)
+{
+  LPTHREAD_START_ROUTINE adr_ExitThread =
+    (LPTHREAD_START_ROUTINE)
+    GetProcAddress (GetModuleHandle ("kernel32"), "ExitThread");
+  DWORD dw_unused;
+  CONTEXT context;
+  MEMORY_BASIC_INFORMATION mbi;
+
+  pmc->h_process = h_process;
+  pmc->h_thread = CreateRemoteThread (h_process, NULL, size,
+				     adr_ExitThread, NULL,
+				     CREATE_SUSPENDED, &dw_unused);
+  if (pmc->h_thread == NULL)
+    return 0;
+
+  /* Get context, for thread's stack pointer */
+  context.ContextFlags = CONTEXT_CONTROL;
+  if (!GetThreadContext (pmc->h_thread, &context))
+    goto failure;
+
+  /* Determine base address of the committed range */
+  if (sizeof(mbi) != VirtualQueryEx (h_process,
+#if defined (_X86_)
+				     (LPDWORD)context.Esp - 1,
+#elif defined (_ALPHA_)
+				     (LPDWORD)context.IntSp - 1,
+#else
+#error Unknown processor architecture
+#endif
+				     &mbi, sizeof(mbi)))
+    goto failure;
+
+  /* Change the page protection of the allocated memory to executable,
+     read, and write. */
+  if (!VirtualProtectEx (h_process, mbi.BaseAddress, size,
+			 PAGE_EXECUTE_READWRITE, &dw_unused))
+    goto failure;
+
+  pmc->address = mbi.BaseAddress;
+  return 1;
+
+ failure:
+  ResumeThread (pmc->h_thread);
+  pmc->address = 0;
+  return 0;
+}
+
+static void
+free_process_memory (process_memory* pmc)
+{
+  ResumeThread (pmc->h_thread);
+}
+
+/*
+ * Run ROUTINE in the context of process determined by H_PROCESS. The
+ * routine is passed the address of DATA as parameter. The ROUTINE must
+ * not be longer than ROUTINE_CODE_SIZE bytes. DATA_SIZE is the size of
+ * DATA structure.
+ *
+ * Note that the code must be positionally independent, and compiled
+ * without stack checks (they cause implicit calls into CRT so will
+ * fail). DATA should not refer any data in calling process, as both
+ * routine and its data are copied into remote process. Size of data
+ * and code together should not exceed one page (4K on x86 systems).
+ *
+ * Return the value returned by ROUTINE, or (DWORD)-1 if call failed.
+ */
+static DWORD
+run_in_other_process (HANDLE h_process,
+		      LPTHREAD_START_ROUTINE routine,
+		      LPVOID data, size_t data_size)
+{
+  process_memory pm;
+  CONST size_t code_size = FRAGMENT_CODE_SIZE;
+  /* Need at most 3 extra bytes of memory, for data alignment */
+  size_t total_size = code_size + data_size + 3;
+  LPVOID remote_data;
+  HANDLE h_thread;
+  DWORD dw_unused;
+
+  /* Allocate memory */
+  if (!alloc_process_memory (h_process, total_size, &pm))
+    return (DWORD)-1;
+
+  /* Copy code */
+  if (!WriteProcessMemory (h_process, pm.address, (LPVOID)routine,
+			   code_size, NULL))
+    goto failure;
+
+  /* Copy data */
+  if (data_size)
+    {
+      remote_data = (LPBYTE)pm.address + ((code_size + 4) & ~3);
+      if (!WriteProcessMemory (h_process, remote_data, data, data_size, NULL))
+	goto failure;
+    }
+  else
+    remote_data = NULL;
+
+  /* Execute the remote copy of code, passing it remote data */
+  h_thread = CreateRemoteThread (h_process, NULL, 0,
+				 (LPTHREAD_START_ROUTINE) pm.address,
+				 remote_data, 0, &dw_unused);
+  if (h_thread == NULL)
+    goto failure;
+
+  /* Wait till thread finishes */
+  WaitForSingleObject (h_thread, INFINITE);
+
+  /* Free remote memory */
+  free_process_memory (&pm);
+
+  /* Return thread's exit code */
+  {
+    DWORD exit_code;
+    GetExitCodeThread (h_thread, &exit_code);
+    CloseHandle (h_thread);
+    return exit_code;
+  }
+
+ failure:
+  free_process_memory (&pm);
+  return (DWORD)-1;
+}
+
+/*-----------------------------------------------------------------------*/
+/* Sending signals							 */
+/*-----------------------------------------------------------------------*/
+
+/*
+ * We handle the following signals:
+ *
+ * SIGKILL, SIGTERM, SIGQUIT, SIGHUP - These four translate to ExitProcess
+ *    executed by the remote process
+ * SIGINT - The remote process is sent CTRL_BREAK_EVENT
+ *
+ * The MSVC5.0 compiler feels free to re-order functions within a
+ * compilation unit, so we have no way of finding out the size of the
+ * following functions. Therefore these functions must not be larger than
+ * FRAGMENT_CODE_SIZE.
+ */
+
+/*
+ * Sending SIGKILL
+ */
+typedef struct
+{
+  void (WINAPI *adr_ExitProcess) (UINT);
+} sigkill_data;
+
+static DWORD WINAPI
+sigkill_proc (sigkill_data* data)
+{
+  (*data->adr_ExitProcess)(255);
+  return 1;
+}
+
+/*
+ * Sending break or control c
+ */
+typedef struct
+{
+  BOOL (WINAPI *adr_GenerateConsoleCtrlEvent) (DWORD, DWORD);
+  DWORD event;
+} sigint_data;
+
+static DWORD WINAPI
+sigint_proc (sigint_data* data)
+{
+  return (*data->adr_GenerateConsoleCtrlEvent) (data->event, 0);
+}
+
+/*
+ * Enabling signals
+ */
+typedef struct
+{
+  BOOL (WINAPI *adr_SetConsoleCtrlHandler) (LPVOID, BOOL);
+} sig_enable_data;
+
+static DWORD WINAPI
+sig_enable_proc (sig_enable_data* data)
+{
+  (*data->adr_SetConsoleCtrlHandler) (NULL, FALSE);
+  return 1;
+}
+
+/*
+ * Send signal SIGNO to process H_PROCESS.
+ * Return nonzero if successful.
+ */
+
+/* This code assigns a return value of GetProcAddress to function pointers
+   of many different types. Instead of heavy obscure casts, we just disable
+   warnings about assignments to different function pointer types. */
+#pragma warning (disable : 4113)
+
+static int
+send_signal (HANDLE h_process, int signo)
+{
+  HMODULE h_kernel = GetModuleHandle ("kernel32");
+  DWORD retval;
+  
+  assert (h_kernel != NULL);
+  
+  switch (signo)
+    {
+    case SIGKILL:
+    case SIGTERM:
+    case SIGQUIT:
+    case SIGHUP:
+      {
+	sigkill_data d;
+	d.adr_ExitProcess = GetProcAddress (h_kernel, "ExitProcess");
+	assert (d.adr_ExitProcess);
+	retval = run_in_other_process (h_process, 
+				       (LPTHREAD_START_ROUTINE)sigkill_proc,
+				       &d, sizeof (d));
+	break;
+      }
+    case SIGINT:
+      {
+	sigint_data d;
+	d.adr_GenerateConsoleCtrlEvent =
+	  GetProcAddress (h_kernel, "GenerateConsoleCtrlEvent");
+	assert (d.adr_GenerateConsoleCtrlEvent);
+	d.event = CTRL_C_EVENT;
+	retval = run_in_other_process (h_process, 
+				       (LPTHREAD_START_ROUTINE)sigint_proc,
+				       &d, sizeof (d));
+	break;
+      }
+    default:
+      assert (0);
+    }
+
+  return (int)retval > 0 ? 1 : 0;
+}
+
+/*
+ * Enable CTRL_C_EVENT handling in a new child process
+ */
+static void
+enable_child_signals (HANDLE h_process)
+{
+  HMODULE h_kernel = GetModuleHandle ("kernel32");
+  sig_enable_data d;
+  
+  assert (h_kernel != NULL);
+  d.adr_SetConsoleCtrlHandler =
+    GetProcAddress (h_kernel, "SetConsoleCtrlHandler");
+  assert (d.adr_SetConsoleCtrlHandler);
+  run_in_other_process (h_process, (LPTHREAD_START_ROUTINE)sig_enable_proc,
+			&d, sizeof (d));
+}
+  
+#pragma warning (default : 4113)
+
+/*
+ * Signal error if SIGNO is not supported
+ */
+static void
+validate_signal_number (int signo)
+{
+  if (signo != SIGKILL && signo != SIGTERM
+      && signo != SIGQUIT && signo != SIGINT
+      && signo != SIGHUP)
+    signal_simple_error ("Signal number not supported", make_int (signo));
+}
+  
+/*-----------------------------------------------------------------------*/
+/* Process methods							 */
+/*-----------------------------------------------------------------------*/
+
+/*
+ * Allocate and initialize Lisp_Process->process_data
+ */
+
+static void
+nt_alloc_process_data (struct Lisp_Process *p)
+{
+  p->process_data = xnew_and_zero (struct nt_process_data);
+}
+
+static void
+nt_finalize_process_data (struct Lisp_Process *p, int for_disksave)
+{
+  assert (!for_disksave);
+  if (NT_DATA(p)->h_process)
+    CloseHandle (NT_DATA(p)->h_process);
+}
+
+/*
+ * Initialize XEmacs process implementation once
+ */
+static void
+nt_init_process (void)
+{
+  /* Initialize winsock */
+  WSADATA wsa_data;
+  /* Request Winsock v1.1 Note the order: (minor=1, major=1) */
+  WSAStartup (MAKEWORD (1,1), &wsa_data);
+}
+
+/*
+ * Fork off a subprocess. P is a pointer to newly created subprocess
+ * object. If this function signals, the caller is responsible for
+ * deleting (and finalizing) the process object.
+ *
+ * The method must return PID of the new process, a (positive??? ####) number
+ * which fits into Lisp_Int. No return value indicates an error, the method
+ * must signal an error instead.
+ */
+
+static void
+signal_cannot_launch (Lisp_Object image_file, DWORD err)
+{
+  mswindows_set_errno (err);
+  signal_simple_error_2 ("Error starting", image_file, lisp_strerror (errno));
+}
+
+static int
+nt_create_process (struct Lisp_Process *p,
+		   Lisp_Object *argv, int nargv,
+		   Lisp_Object program, Lisp_Object cur_dir)
+{
+  HANDLE hmyshove, hmyslurp, hprocin, hprocout;
+  LPTSTR command_line;
+  BOOL do_io, windowed;
+  char *proc_env;
+
+  /* Find out whether the application is windowed or not */
+  {
+    /* SHGetFileInfo tends to return ERROR_FILE_NOT_FOUND on most
+       errors. This leads to bogus error message. */
+    DWORD image_type;
+    char *p = strrchr ((char *)XSTRING_DATA (program), '.');
+    if (p != NULL &&
+	(stricmp (p, ".exe") == 0 ||
+	 stricmp (p, ".com") == 0 ||
+	 stricmp (p, ".bat") == 0 ||
+	 stricmp (p, ".cmd") == 0))
+      {
+	image_type = SHGetFileInfo ((char *)XSTRING_DATA (program), 0,NULL,
+				    0, SHGFI_EXETYPE);
+      }
+    else
+      {
+	char progname[MAX_PATH];
+	sprintf (progname, "%s.exe", (char *)XSTRING_DATA (program));
+	image_type = SHGetFileInfo (progname, 0, NULL, 0, SHGFI_EXETYPE);
+      }
+    if (image_type == 0)
+      signal_cannot_launch (program, (GetLastError () == ERROR_FILE_NOT_FOUND
+				      ? ERROR_BAD_FORMAT : GetLastError ()));
+    windowed = HIWORD (image_type) != 0;
+  }
+
+  /* Decide whether to do I/O on process handles, or just mark the
+     process exited immediately upon successful launching. We do I/O if the
+     process is a console one, or if it is windowed but windowed_process_io
+     is non-zero */
+  do_io = !windowed || windowed_process_io ;
+  
+  if (do_io)
+    {
+      /* Create two unidirectional named pipes */
+      HANDLE htmp;
+      SECURITY_ATTRIBUTES sa;
+
+      sa.nLength = sizeof(sa);
+      sa.bInheritHandle = TRUE;
+      sa.lpSecurityDescriptor = NULL;
+
+      CreatePipe (&hprocin, &hmyshove, &sa, 0);
+      CreatePipe (&hmyslurp, &hprocout, &sa, 0);
+
+      /* Stupid Win32 allows to create a pipe with *both* ends either
+	 inheritable or not. We need process ends inheritable, and local
+	 ends not inheritable. */
+      DuplicateHandle (GetCurrentProcess(), hmyshove, GetCurrentProcess(), &htmp,
+		       0, FALSE, DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS);
+      hmyshove = htmp;
+      DuplicateHandle (GetCurrentProcess(), hmyslurp, GetCurrentProcess(), &htmp,
+		       0, FALSE, DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS);
+      hmyslurp = htmp;
+    }
+
+  /* Convert an argv vector into Win32 style command line by a call to
+     lisp function `nt-quote-process-args' which see (in winnt.el)*/
+  {
+    int i;
+    Lisp_Object args_or_ret = Qnil;
+    struct gcpro gcpro1;
+
+    GCPRO1 (args_or_ret);
+
+    for (i = 0; i < nargv; ++i)
+      args_or_ret = Fcons (*argv++, args_or_ret);
+    args_or_ret = Fnreverse (args_or_ret);
+    args_or_ret = Fcons (program, args_or_ret);
+
+    args_or_ret = call1 (Qnt_quote_process_args, args_or_ret);
+
+    if (!STRINGP (args_or_ret))
+      /* Luser wrote his/her own clever version */
+      error ("Bogus return value from `nt-quote-process-args'");
+
+    command_line = alloca_array (char, (XSTRING_LENGTH (program)
+					+ XSTRING_LENGTH (args_or_ret) + 2));
+    strcpy (command_line, XSTRING_DATA (program));
+    strcat (command_line, " ");
+    strcat (command_line, XSTRING_DATA (args_or_ret));
+
+    UNGCPRO; /* args_or_ret */
+  }
+
+  /* Set `proc_env' to a nul-separated array of the strings in
+     Vprocess_environment terminated by 2 nuls.  */
+ 
+  {
+    extern int compare_env (const char **strp1, const char **strp2);
+    char **env;
+    REGISTER Lisp_Object tem;
+    REGISTER char **new_env;
+    REGISTER int new_length = 0, i, new_space;
+    char *penv;
+    
+    for (tem = Vprocess_environment;
+ 	 (CONSP (tem)
+ 	  && STRINGP (XCAR (tem)));
+ 	 tem = XCDR (tem))
+      new_length++;
+    
+    /* new_length + 1 to include terminating 0.  */
+    env = new_env = alloca_array (char *, new_length + 1);
+ 
+    /* Copy the Vprocess_environment strings into new_env.  */
+    for (tem = Vprocess_environment;
+ 	 (CONSP (tem)
+ 	  && STRINGP (XCAR (tem)));
+ 	 tem = XCDR (tem))
+      {
+	char **ep = env;
+	char *string = (char *) XSTRING_DATA (XCAR (tem));
+	/* See if this string duplicates any string already in the env.
+	   If so, don't put it in.
+	   When an env var has multiple definitions,
+	   we keep the definition that comes first in process-environment.  */
+	for (; ep != new_env; ep++)
+	  {
+	    char *p = *ep, *q = string;
+	    while (1)
+	      {
+		if (*q == 0)
+		  /* The string is malformed; might as well drop it.  */
+		  goto duplicate;
+		if (*q != *p)
+		  break;
+		if (*q == '=')
+		  goto duplicate;
+		p++, q++;
+	      }
+	  }
+	*new_env++ = string;
+      duplicate: ;
+      }
+    *new_env = 0;
+    
+    /* Sort the environment variables */
+    new_length = new_env - env;
+    qsort (env, new_length, sizeof (char *), compare_env);
+    
+    /* Work out how much space to allocate */
+    new_space = 0;
+    for (i = 0; i < new_length; i++)
+      {
+ 	new_space += strlen(env[i]) + 1;
+      }
+    new_space++;
+    
+    /* Allocate space and copy variables into it */
+    penv = proc_env = alloca(new_space);
+    for (i = 0; i < new_length; i++)
+      {
+ 	strcpy(penv, env[i]);
+ 	penv += strlen(env[i]) + 1;
+      }
+    *penv = 0;
+  }
+  
+  /* Create process */
+  {
+    STARTUPINFO si;
+    PROCESS_INFORMATION pi;
+    DWORD err;
+
+    xzero (si);
+    si.dwFlags = STARTF_USESHOWWINDOW;
+    si.wShowWindow = windowed ? SW_SHOWNORMAL : SW_HIDE;
+    if (do_io)
+      {
+	si.hStdInput = hprocin;
+	si.hStdOutput = hprocout;
+	si.hStdError = hprocout;
+	si.dwFlags |= STARTF_USESTDHANDLES;
+      }
+
+    err = (CreateProcess (NULL, command_line, NULL, NULL, TRUE,
+			  CREATE_NEW_CONSOLE | CREATE_NEW_PROCESS_GROUP
+			  | CREATE_SUSPENDED,
+			  proc_env, (char *) XSTRING_DATA (cur_dir), &si, &pi)
+	   ? 0 : GetLastError ());
+
+    if (do_io)
+      {
+	/* These just have been inherited; we do not need a copy */
+	CloseHandle (hprocin);
+	CloseHandle (hprocout);
+      }
+    
+    /* Handle process creation failure */
+    if (err)
+      {
+	if (do_io)
+	  {
+	    CloseHandle (hmyshove);
+	    CloseHandle (hmyslurp);
+	  }
+	signal_cannot_launch (program, GetLastError ());
+      }
+
+    /* The process started successfully */
+    if (do_io)
+      {
+	NT_DATA(p)->h_process = pi.hProcess;
+	init_process_io_handles (p, (void*)hmyslurp, (void*)hmyshove, 0);
+      }
+    else
+      {
+	/* Indicate as if the process has exited immediately. */
+	p->status_symbol = Qexit;
+	CloseHandle (pi.hProcess);
+      }
+
+    if (!windowed)
+      enable_child_signals (pi.hProcess);
+
+    ResumeThread (pi.hThread);
+    CloseHandle (pi.hThread);
+
+    /* Hack to support Windows 95 negative pids */
+    return ((int)pi.dwProcessId < 0
+	    ? -(int)pi.dwProcessId : (int)pi.dwProcessId);
+  }
+}
+
+/* 
+ * This method is called to update status fields of the process
+ * structure. If the process has not existed, this method is expected
+ * to do nothing.
+ *
+ * The method is called only for real child processes.  
+ */
+
+static void
+nt_update_status_if_terminated (struct Lisp_Process* p)
+{
+  DWORD exit_code;
+  if (GetExitCodeProcess (NT_DATA(p)->h_process, &exit_code)
+      && exit_code != STILL_ACTIVE)
+    {
+      p->tick++;
+      p->core_dumped = 0;
+      /* The exit code can be a code returned by process, or an
+	 NTSTATUS value. We cannot accurately handle the latter since
+	 it is a full 32 bit integer */
+      if (exit_code & 0xC0000000)
+	{
+	  p->status_symbol = Qsignal;
+	  p->exit_code = exit_code & 0x1FFFFFFF;
+	}
+      else
+	{
+	  p->status_symbol = Qexit;
+	  p->exit_code = exit_code;
+	}
+    }
+}
+
+/*
+ * Stuff the entire contents of LSTREAM to the process output pipe
+ */
+
+/* #### If only this function could be somehow merged with
+   unix_send_process... */
+
+static void
+nt_send_process (Lisp_Object proc, struct lstream* lstream)
+{
+  struct Lisp_Process *p = XPROCESS (proc);
+
+  /* use a reasonable-sized buffer (somewhere around the size of the
+     stream buffer) so as to avoid inundating the stream with blocked
+     data. */
+  Bufbyte chunkbuf[128];
+  Bytecount chunklen;
+
+  while (1)
+    {
+      ssize_t writeret;
+
+      chunklen = Lstream_read (lstream, chunkbuf, 128);
+      if (chunklen <= 0)
+	break; /* perhaps should abort() if < 0?
+		  This should never happen. */
+
+      /* Lstream_write() will never successfully write less than the
+	 amount sent in.  In the worst case, it just buffers the
+	 unwritten data. */
+      writeret = Lstream_write (XLSTREAM (DATA_OUTSTREAM(p)), chunkbuf,
+				chunklen);
+      Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p)));
+      if (writeret < 0)
+	{
+	  p->status_symbol = Qexit;
+	  p->exit_code = ERROR_BROKEN_PIPE;
+	  p->core_dumped = 0;
+	  p->tick++;
+	  process_tick++;
+	  deactivate_process (proc);
+	  error ("Broken pipe error sending to process %s; closed it",
+		 XSTRING_DATA (p->name));
+	}
+
+      {
+	int wait_ms = 25;
+	while (Lstream_was_blocked_p (XLSTREAM (p->pipe_outstream)))
+	  {
+	    /* Buffer is full.  Wait, accepting input; that may allow
+	       the program to finish doing output and read more.  */
+	    Faccept_process_output (Qnil, Qzero, make_int (wait_ms));
+	    Lstream_flush (XLSTREAM (p->pipe_outstream));
+	    wait_ms = min (1000, 2 * wait_ms);
+	  }
+      }
+    }
+}
+
+/*
+ * Send a signal number SIGNO to PROCESS.
+ * CURRENT_GROUP means send to the process group that currently owns
+ * the terminal being used to communicate with PROCESS.
+ * This is used for various commands in shell mode.
+ * If NOMSG is zero, insert signal-announcements into process's buffers
+ * right away.
+ *
+ * If we can, we try to signal PROCESS by sending control characters
+ * down the pty.  This allows us to signal inferiors who have changed
+ * their uid, for which killpg would return an EPERM error.
+ *
+ * The method signals an error if the given SIGNO is not valid
+ */
+
+static void
+nt_kill_child_process (Lisp_Object proc, int signo,
+		       int current_group, int nomsg)
+{
+  struct Lisp_Process *p = XPROCESS (proc);
+
+  /* Signal error if SIGNO cannot be sent */
+  validate_signal_number (signo);
+
+  /* Send signal */
+  if (!send_signal (NT_DATA(p)->h_process, signo))
+    error ("Cannot send signal to process");
+}
+
+/*
+ * Kill any process in the system given its PID.
+ *
+ * Returns zero if a signal successfully sent, or
+ * negative number upon failure
+ */
+static int
+nt_kill_process_by_pid (int pid, int signo)
+{
+  HANDLE h_process;
+  int send_result;
+  
+  /* Signal error if SIGNO cannot be sent */
+  validate_signal_number (signo);
+
+  /* Try to open the process with required privileges */
+  h_process = OpenProcess (PROCESS_CREATE_THREAD
+			   | PROCESS_QUERY_INFORMATION 
+			   | PROCESS_VM_OPERATION
+			   | PROCESS_VM_WRITE,
+			   FALSE, pid);
+  if (h_process == NULL)
+    return -1;
+  
+  send_result = send_signal (h_process, signo);
+  
+  CloseHandle (h_process);
+
+  return send_result ? 0 : -1;
+}
+
+/*-----------------------------------------------------------------------*/
+/* Sockets connections							 */
+/*-----------------------------------------------------------------------*/
+#ifdef HAVE_SOCKETS
+
+/* #### Hey MS, how long Winsock 2 for '95 will be in beta? */
+
+#define SOCK_TIMER_ID 666
+#define XM_SOCKREPLY (WM_USER + 666)
+
+static int
+get_internet_address (Lisp_Object host, struct sockaddr_in *address,
+		      Error_behavior errb)
+{
+  char buf [MAXGETHOSTSTRUCT];
+  HWND hwnd;
+  HANDLE hasync;
+  int success = 0;
+
+  address->sin_family = AF_INET;
+
+  /* First check if HOST is already a numeric address */
+  {
+    unsigned long inaddr = inet_addr (XSTRING_DATA (host));
+    if (inaddr != INADDR_NONE)
+      {
+	address->sin_addr.s_addr = inaddr;
+	return 1;
+      }
+  }
+
+  /* Create a window which will receive completion messages */
+  hwnd = CreateWindow ("STATIC", NULL, WS_OVERLAPPED, 0, 0, 1, 1,
+		       NULL, NULL, NULL, NULL);
+  assert (hwnd);
+
+  /* Post name resolution request */
+  hasync = WSAAsyncGetHostByName (hwnd, XM_SOCKREPLY, XSTRING_DATA (host),
+				  buf, sizeof (buf));
+  if (hasync == NULL)
+    goto done;
+
+  /* Set a timer to poll for quit every 250 ms */
+  SetTimer (hwnd, SOCK_TIMER_ID, 250, NULL);
+
+  while (1)
+    {
+      MSG msg;
+      GetMessage (&msg, hwnd, 0, 0);
+      if (msg.message == XM_SOCKREPLY)
+	{
+	  /* Ok, got an answer */
+	  if (WSAGETASYNCERROR(msg.lParam) == NO_ERROR)
+	    success = 1;
+	  goto done;
+	}
+      else if (msg.message == WM_TIMER && msg.wParam == SOCK_TIMER_ID)
+	{
+	  if (QUITP)
+	    {
+	      WSACancelAsyncRequest (hasync);
+	      KillTimer (hwnd, SOCK_TIMER_ID);
+	      DestroyWindow (hwnd);
+	      REALLY_QUIT;
+	    }
+	}
+      DispatchMessage (&msg);
+    }
+
+ done:
+  KillTimer (hwnd, SOCK_TIMER_ID);
+  DestroyWindow (hwnd);
+  if (success)
+    {
+      /* BUF starts with struct hostent */
+      struct hostent* he = (struct hostent*) buf;
+      address->sin_addr.s_addr = *(unsigned long*)he->h_addr_list[0];
+    }
+  return success;
+}
+
+static Lisp_Object
+nt_canonicalize_host_name (Lisp_Object host)
+{
+  struct sockaddr_in address;
+
+  if (!get_internet_address (host, &address, ERROR_ME_NOT))
+    return host;
+
+  if (address.sin_family == AF_INET)
+    return build_string (inet_ntoa (address.sin_addr));
+  else
+    return host;
+}
+
+/* open a TCP network connection to a given HOST/SERVICE.  Treated
+   exactly like a normal process when reading and writing.  Only
+   differences are in status display and process deletion.  A network
+   connection has no PID; you cannot signal it.  All you can do is
+   deactivate and close it via delete-process */
+
+static void
+nt_open_network_stream (Lisp_Object name, Lisp_Object host, Lisp_Object service,
+			Lisp_Object protocol, void** vinfd, void** voutfd)
+{
+  struct sockaddr_in address;
+  SOCKET s;
+  int port;
+  int retval;
+
+  CHECK_STRING (host);
+
+  if (!EQ (protocol, Qtcp))
+    error ("Unsupported protocol \"%s\"",
+	   string_data (symbol_name (XSYMBOL (protocol))));
+
+  if (INTP (service))
+    port = htons ((unsigned short) XINT (service));
+  else
+    {
+      struct servent *svc_info;
+      CHECK_STRING (service);
+      svc_info = getservbyname ((char *) XSTRING_DATA (service), "tcp");
+      if (svc_info == 0)
+	error ("Unknown service \"%s\"", XSTRING_DATA (service));
+      port = svc_info->s_port;
+    }
+
+  get_internet_address (host, &address, ERROR_ME);
+  address.sin_port = port;
+
+  s = socket (address.sin_family, SOCK_STREAM, 0);
+  if (s < 0)
+    report_file_error ("error creating socket", list1 (name));
+
+  /* We don't want to be blocked on connect */
+  {
+    unsigned long nonblock = 1;
+    ioctlsocket (s, FIONBIO, &nonblock);
+  }
+  
+  retval = connect (s, (struct sockaddr *) &address, sizeof (address));
+  if (retval != NO_ERROR && WSAGetLastError() != WSAEWOULDBLOCK)
+    goto connect_failed;
+
+  /* Wait while connection is established */
+  while (1)
+    {
+      fd_set fdset;
+      struct timeval tv;
+      int nsel;
+
+      if (QUITP)
+	{
+	  closesocket (s);
+	  REALLY_QUIT;
+	}
+
+      /* Poll for quit every 250 ms */
+      tv.tv_sec = 0;
+      tv.tv_usec = 250 * 1000;
+
+      FD_ZERO (&fdset);
+      FD_SET (s, &fdset);
+      nsel = select (0, NULL, &fdset, &fdset, &tv);
+
+      if (nsel > 0)
+	{
+	  /* Check: was connection successful or not? */
+	  tv.tv_usec = 0;
+	  nsel = select (0, NULL, NULL, &fdset, &tv);
+	  if (nsel > 0)
+	    goto connect_failed;
+	  else
+	    break;
+	}
+    }
+
+  /* We are connected at this point */
+  *vinfd = (void*)s;
+  DuplicateHandle (GetCurrentProcess(), (HANDLE)s,
+		   GetCurrentProcess(), (LPHANDLE)voutfd,
+		   0, FALSE, DUPLICATE_SAME_ACCESS);
+  return;
+
+ connect_failed:  
+  closesocket (s);
+  report_file_error ("connection failed", list2 (host, name));
+}
+
+#endif
+
+/*-----------------------------------------------------------------------*/
+/* Initialization							 */
+/*-----------------------------------------------------------------------*/
+
+void
+process_type_create_nt (void)
+{
+  PROCESS_HAS_METHOD (nt, alloc_process_data);
+  PROCESS_HAS_METHOD (nt, finalize_process_data);
+  PROCESS_HAS_METHOD (nt, init_process);
+  PROCESS_HAS_METHOD (nt, create_process);
+  PROCESS_HAS_METHOD (nt, update_status_if_terminated);
+  PROCESS_HAS_METHOD (nt, send_process);
+  PROCESS_HAS_METHOD (nt, kill_child_process);
+  PROCESS_HAS_METHOD (nt, kill_process_by_pid);
+#ifdef HAVE_SOCKETS
+  PROCESS_HAS_METHOD (nt, canonicalize_host_name);
+  PROCESS_HAS_METHOD (nt, open_network_stream);
+#ifdef HAVE_MULTICAST
+#error I won't do this until '95 has winsock2
+  PROCESS_HAS_METHOD (nt, open_multicast_group);
+#endif
+#endif
+}
+
+void
+syms_of_process_nt (void)
+{
+  defsymbol (&Qnt_quote_process_args, "nt-quote-process-args");
+}
+
+void
+vars_of_process_nt (void)
+{
+}