--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libiberty/pex-win32.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,922 @@
+/* Utilities to execute a program in a subprocess (possibly linked by pipes
+   with other subprocesses), and wait for it.  Generic Win32 specialization.
+   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006
+   Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+#include "pex-common.h"
+
+#include <windows.h>
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#include <assert.h>
+#include <process.h>
+#include <io.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <ctype.h>
+
+/* mingw32 headers may not define the following.  */
+
+#ifndef _P_WAIT
+#  define _P_WAIT	0
+#  define _P_NOWAIT	1
+#  define _P_OVERLAY	2
+#  define _P_NOWAITO	3
+#  define _P_DETACH	4
+
+#  define WAIT_CHILD		0
+#  define WAIT_GRANDCHILD	1
+#endif
+
+#define MINGW_NAME "Minimalist GNU for Windows"
+#define MINGW_NAME_LEN (sizeof(MINGW_NAME) - 1)
+
+extern char *stpcpy (char *dst, const char *src);
+
+/* Ensure that the executable pathname uses Win32 backslashes. This
+   is not necessary on NT, but on W9x, forward slashes causes
+   failure of spawn* and exec* functions (and probably any function
+   that calls CreateProcess) *iff* the executable pathname (argv[0])
+   is a quoted string.  And quoting is necessary in case a pathname
+   contains embedded white space.  You can't win.  */
+static void
+backslashify (char *s)
+{
+  while ((s = strchr (s, '/')) != NULL)
+    *s = '\\';
+  return;
+}
+
+static int pex_win32_open_read (struct pex_obj *, const char *, int);
+static int pex_win32_open_write (struct pex_obj *, const char *, int);
+static pid_t pex_win32_exec_child (struct pex_obj *, int, const char *,
+				  char * const *, char * const *,
+                                  int, int, int, int,
+				  const char **, int *);
+static int pex_win32_close (struct pex_obj *, int);
+static int pex_win32_wait (struct pex_obj *, pid_t, int *,
+			   struct pex_time *, int, const char **, int *);
+static int pex_win32_pipe (struct pex_obj *, int *, int);
+static FILE *pex_win32_fdopenr (struct pex_obj *, int, int);
+static FILE *pex_win32_fdopenw (struct pex_obj *, int, int);
+
+/* The list of functions we pass to the common routines.  */
+
+const struct pex_funcs funcs =
+{
+  pex_win32_open_read,
+  pex_win32_open_write,
+  pex_win32_exec_child,
+  pex_win32_close,
+  pex_win32_wait,
+  pex_win32_pipe,
+  pex_win32_fdopenr,
+  pex_win32_fdopenw,
+  NULL /* cleanup */
+};
+
+/* Return a newly initialized pex_obj structure.  */
+
+struct pex_obj *
+pex_init (int flags, const char *pname, const char *tempbase)
+{
+  return pex_init_common (flags, pname, tempbase, &funcs);
+}
+
+/* Open a file for reading.  */
+
+static int
+pex_win32_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
+		     int binary)
+{
+  return _open (name, _O_RDONLY | (binary ? _O_BINARY : _O_TEXT));
+}
+
+/* Open a file for writing.  */
+
+static int
+pex_win32_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
+		      int binary)
+{
+  /* Note that we can't use O_EXCL here because gcc may have already
+     created the temporary file via make_temp_file.  */
+  return _open (name,
+		(_O_WRONLY | _O_CREAT | _O_TRUNC
+		 | (binary ? _O_BINARY : _O_TEXT)),
+		_S_IREAD | _S_IWRITE);
+}
+
+/* Close a file.  */
+
+static int
+pex_win32_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
+{
+  return _close (fd);
+}
+
+#ifdef USE_MINGW_MSYS
+static const char *mingw_keys[] = {"SOFTWARE", "Microsoft", "Windows", "CurrentVersion", "Uninstall", NULL};
+
+/* Tack the executable on the end of a (possibly slash terminated) buffer
+   and convert everything to \. */
+static const char *
+tack_on_executable (char *buf, const char *executable)
+{
+  char *p = strchr (buf, '\0');
+  if (p > buf && (p[-1] == '\\' || p[-1] == '/'))
+    p[-1] = '\0';
+  backslashify (strcat (buf, executable));
+  return buf;
+}
+
+/* Walk down a registry hierarchy until the end.  Return the key. */
+static HKEY
+openkey (HKEY hStart, const char *keys[])
+{
+  HKEY hKey, hTmp;
+  for (hKey = hStart; *keys; keys++)
+    {
+      LONG res;
+      hTmp = hKey;
+      res = RegOpenKey (hTmp, *keys, &hKey);
+
+      if (hTmp != HKEY_LOCAL_MACHINE)
+	RegCloseKey (hTmp);
+
+      if (res != ERROR_SUCCESS)
+	return NULL;
+    }
+  return hKey;
+}
+
+/* Return the "mingw root" as derived from the mingw uninstall information. */
+static const char *
+mingw_rootify (const char *executable)
+{
+  HKEY hKey, hTmp;
+  DWORD maxlen;
+  char *namebuf, *foundbuf;
+  DWORD i;
+  LONG res;
+
+  /* Open the uninstall "directory". */
+  hKey = openkey (HKEY_LOCAL_MACHINE, mingw_keys);
+
+  /* Not found. */
+  if (!hKey)
+    return executable;
+
+  /* Need to enumerate all of the keys here looking for one the most recent
+     one for MinGW. */
+  if (RegQueryInfoKey (hKey, NULL, NULL, NULL, NULL, &maxlen, NULL, NULL,
+		       NULL, NULL, NULL, NULL) != ERROR_SUCCESS)
+    {
+      RegCloseKey (hKey);
+      return executable;
+    }
+  namebuf = XNEWVEC (char, ++maxlen);
+  foundbuf = XNEWVEC (char, maxlen);
+  foundbuf[0] = '\0';
+  if (!namebuf || !foundbuf)
+    {
+      RegCloseKey (hKey);
+      if (namebuf)
+	free (namebuf);
+      if (foundbuf)
+	free (foundbuf);
+      return executable;
+    }
+
+  /* Look through all of the keys for one that begins with Minimal GNU...
+     Try to get the latest version by doing a string compare although that
+     string never really works with version number sorting. */
+  for (i = 0; RegEnumKey (hKey, i, namebuf, maxlen) == ERROR_SUCCESS; i++)
+    {
+      int match = strcasecmp (namebuf, MINGW_NAME);
+      if (match < 0)
+	continue;
+      if (match > 0 && strncasecmp (namebuf, MINGW_NAME, MINGW_NAME_LEN) > 0)
+	continue;
+      if (strcasecmp (namebuf, foundbuf) > 0)
+	strcpy (foundbuf, namebuf);
+    }
+  free (namebuf);
+
+  /* If foundbuf is empty, we didn't find anything.  Punt. */
+  if (!foundbuf[0])
+    {
+      free (foundbuf);
+      RegCloseKey (hKey);
+      return executable;
+    }
+
+  /* Open the key that we wanted */
+  res = RegOpenKey (hKey, foundbuf, &hTmp);
+  RegCloseKey (hKey);
+  free (foundbuf);
+
+  /* Don't know why this would fail, but you gotta check */
+  if (res != ERROR_SUCCESS)
+    return executable;
+
+  maxlen = 0;
+  /* Get the length of the value pointed to by InstallLocation */
+  if (RegQueryValueEx (hTmp, "InstallLocation", 0, NULL, NULL,
+		       &maxlen) != ERROR_SUCCESS || maxlen == 0)
+    {
+      RegCloseKey (hTmp);
+      return executable;
+    }
+
+  /* Allocate space for the install location */
+  foundbuf = XNEWVEC (char, maxlen + strlen (executable));
+  if (!foundbuf)
+    {
+      free (foundbuf);
+      RegCloseKey (hTmp);
+    }
+
+  /* Read the install location into the buffer */
+  res = RegQueryValueEx (hTmp, "InstallLocation", 0, NULL, (LPBYTE) foundbuf,
+			 &maxlen);
+  RegCloseKey (hTmp);
+  if (res != ERROR_SUCCESS)
+    {
+      free (foundbuf);
+      return executable;
+    }
+
+  /* Concatenate the install location and the executable, turn all slashes
+     to backslashes, and return that. */
+  return tack_on_executable (foundbuf, executable);
+}
+
+/* Read the install location of msys from it's installation file and
+   rootify the executable based on that. */
+static const char *
+msys_rootify (const char *executable)
+{
+  size_t bufsize = 64;
+  size_t execlen = strlen (executable) + 1;
+  char *buf;
+  DWORD res = 0;
+  for (;;)
+    {
+      buf = XNEWVEC (char, bufsize + execlen);
+      if (!buf)
+	break;
+      res = GetPrivateProfileString ("InstallSettings", "InstallPath", NULL,
+				     buf, bufsize, "msys.ini");
+      if (!res)
+	break;
+      if (strlen (buf) < bufsize)
+	break;
+      res = 0;
+      free (buf);
+      bufsize *= 2;
+      if (bufsize > 65536)
+	{
+	  buf = NULL;
+	  break;
+	}
+    }
+
+  if (res)
+    return tack_on_executable (buf, executable);
+
+  /* failed */
+  if (buf)
+    free (buf);
+  return executable;
+}
+#endif
+
+/* Return the number of arguments in an argv array, not including the null
+   terminating argument. */
+
+static int
+argv_to_argc (char *const *argv)
+{
+  char *const *i = argv;
+  while (*i)
+    i++;
+  return i - argv;
+}
+
+/* Return a Windows command-line from ARGV.  It is the caller's
+   responsibility to free the string returned.  */
+
+static char *
+argv_to_cmdline (char *const *argv)
+{
+  char *cmdline;
+  char *p;
+  size_t cmdline_len;
+  int i, j, k;
+
+  cmdline_len = 0;
+  for (i = 0; argv[i]; i++)
+    {
+      /* We quote every last argument.  This simplifies the problem;
+	 we need only escape embedded double-quotes and immediately
+	 preceeding backslash characters.  A sequence of backslach characters
+	 that is not follwed by a double quote character will not be
+	 escaped.  */
+      for (j = 0; argv[i][j]; j++)
+	{
+	  if (argv[i][j] == '"')
+	    {
+	      /* Escape preceeding backslashes.  */
+	      for (k = j - 1; k >= 0 && argv[i][k] == '\\'; k--)
+		cmdline_len++;
+	      /* Escape the qote character.  */
+	      cmdline_len++;
+	    }
+	}
+      /* Trailing backslashes also need to be escaped because they will be
+         followed by the terminating quote.  */
+      for (k = j - 1; k >= 0 && argv[i][k] == '\\'; k--)
+	cmdline_len++;
+      cmdline_len += j;
+      cmdline_len += 3;  /* for leading and trailing quotes and space */
+    }
+  cmdline = XNEWVEC (char, cmdline_len);
+  p = cmdline;
+  for (i = 0; argv[i]; i++)
+    {
+      *p++ = '"';
+      for (j = 0; argv[i][j]; j++)
+	{
+	  if (argv[i][j] == '"')
+	    {
+	      for (k = j - 1; k >= 0 && argv[i][k] == '\\'; k--)
+		*p++ = '\\';
+	      *p++ = '\\';
+	    }
+	  *p++ = argv[i][j];
+	}
+      for (k = j - 1; k >= 0 && argv[i][k] == '\\'; k--)
+	*p++ = '\\';
+      *p++ = '"';
+      *p++ = ' ';
+    }
+  p[-1] = '\0';
+  return cmdline;
+}
+
+/* We'll try the passed filename with all the known standard
+   extensions, and then without extension.  We try no extension
+   last so that we don't try to run some random extension-less
+   file that might be hanging around.  We try both extension
+   and no extension so that we don't need any fancy logic
+   to determine if a file has extension.  */
+static const char *const
+std_suffixes[] = {
+  ".com",
+  ".exe",
+  ".bat",
+  ".cmd",
+  "",
+  0
+};
+
+/* Returns the full path to PROGRAM.  If SEARCH is true, look for
+   PROGRAM in each directory in PATH.  */
+
+static char *
+find_executable (const char *program, BOOL search)
+{
+  char *full_executable;
+  char *e;
+  size_t fe_len;
+  const char *path = 0;
+  const char *const *ext;
+  const char *p, *q;
+  size_t proglen = strlen (program);
+  int has_slash = (strchr (program, '/') || strchr (program, '\\'));
+  HANDLE h;
+
+  if (has_slash)
+    search = FALSE;
+
+  if (search)
+    path = getenv ("PATH");
+  if (!path)
+    path = "";
+
+  fe_len = 0;
+  for (p = path; *p; p = q)
+    {
+      q = p;
+      while (*q != ';' && *q != '\0')
+	q++;
+      if ((size_t)(q - p) > fe_len)
+	fe_len = q - p;
+      if (*q == ';')
+	q++;
+    }
+  fe_len = fe_len + 1 + proglen + 5 /* space for extension */;
+  full_executable = XNEWVEC (char, fe_len);
+
+  p = path;
+  do
+    {
+      q = p;
+      while (*q != ';' && *q != '\0')
+	q++;
+
+      e = full_executable;
+      memcpy (e, p, q - p);
+      e += (q - p);
+      if (q - p)
+	*e++ = '\\';
+      strcpy (e, program);
+
+      if (*q == ';')
+	q++;
+
+      for (e = full_executable; *e; e++)
+	if (*e == '/')
+	  *e = '\\';
+
+      /* At this point, e points to the terminating NUL character for
+         full_executable.  */
+      for (ext = std_suffixes; *ext; ext++)
+	{
+	  /* Remove any current extension.  */
+	  *e = '\0';
+	  /* Add the new one.  */
+	  strcat (full_executable, *ext);
+
+	  /* Attempt to open this file.  */
+	  h = CreateFile (full_executable, GENERIC_READ,
+			  FILE_SHARE_READ | FILE_SHARE_WRITE,
+			  0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
+	  if (h != INVALID_HANDLE_VALUE)
+	    goto found;
+	}
+      p = q;
+    }
+  while (*p);
+  free (full_executable);
+  return 0;
+
+ found:
+  CloseHandle (h);
+  return full_executable;
+}
+
+/* Low-level process creation function and helper.  */
+
+static int
+env_compare (const void *a_ptr, const void *b_ptr)
+{
+  const char *a;
+  const char *b;
+  unsigned char c1;
+  unsigned char c2;
+
+  a = *(const char **) a_ptr;
+  b = *(const char **) b_ptr;
+
+  /* a and b will be of the form: VAR=VALUE
+     We compare only the variable name part here using a case-insensitive
+     comparison algorithm.  It might appear that in fact strcasecmp () can
+     take the place of this whole function, and indeed it could, save for
+     the fact that it would fail in cases such as comparing A1=foo and
+     A=bar (because 1 is less than = in the ASCII character set).
+     (Environment variables containing no numbers would work in such a
+     scenario.)  */
+
+  do
+    {
+      c1 = (unsigned char) tolower (*a++);
+      c2 = (unsigned char) tolower (*b++);
+
+      if (c1 == '=')
+        c1 = '\0';
+
+      if (c2 == '=')
+        c2 = '\0';
+    }
+  while (c1 == c2 && c1 != '\0');
+
+  return c1 - c2;
+}
+
+/* Execute a Windows executable as a child process.  This will fail if the
+ * target is not actually an executable, such as if it is a shell script. */
+
+static pid_t
+win32_spawn (const char *executable,
+	     BOOL search,
+	     char *const *argv,
+             char *const *env, /* array of strings of the form: VAR=VALUE */
+	     DWORD dwCreationFlags,
+	     LPSTARTUPINFO si,
+	     LPPROCESS_INFORMATION pi)
+{
+  char *full_executable;
+  char *cmdline;
+  char **env_copy;
+  char *env_block = NULL;
+
+  full_executable = NULL;
+  cmdline = NULL;
+
+  if (env)
+    {
+      int env_size;
+
+      /* Count the number of environment bindings supplied.  */
+      for (env_size = 0; env[env_size]; env_size++)
+        continue;
+    
+      /* Assemble an environment block, if required.  This consists of
+         VAR=VALUE strings juxtaposed (with one null character between each
+         pair) and an additional null at the end.  */
+      if (env_size > 0)
+        {
+          int var;
+          int total_size = 1; /* 1 is for the final null.  */
+          char *bufptr;
+    
+          /* Windows needs the members of the block to be sorted by variable
+             name.  */
+          env_copy = (char **) alloca (sizeof (char *) * env_size);
+          memcpy (env_copy, env, sizeof (char *) * env_size);
+          qsort (env_copy, env_size, sizeof (char *), env_compare);
+    
+          for (var = 0; var < env_size; var++)
+            total_size += strlen (env[var]) + 1;
+    
+          env_block = XNEWVEC (char, total_size);
+          bufptr = env_block;
+          for (var = 0; var < env_size; var++)
+            bufptr = stpcpy (bufptr, env_copy[var]) + 1;
+    
+          *bufptr = '\0';
+        }
+    }
+
+  full_executable = find_executable (executable, search);
+  if (!full_executable)
+    goto error;
+  cmdline = argv_to_cmdline (argv);
+  if (!cmdline)
+    goto error;
+    
+  /* Create the child process.  */  
+  if (!CreateProcess (full_executable, cmdline, 
+		      /*lpProcessAttributes=*/NULL,
+		      /*lpThreadAttributes=*/NULL,
+		      /*bInheritHandles=*/TRUE,
+		      dwCreationFlags,
+		      (LPVOID) env_block,
+		      /*lpCurrentDirectory=*/NULL,
+		      si,
+		      pi))
+    {
+      if (env_block)
+        free (env_block);
+
+      free (full_executable);
+
+      return (pid_t) -1;
+    }
+
+  /* Clean up.  */
+  CloseHandle (pi->hThread);
+  free (full_executable);
+  if (env_block)
+    free (env_block);
+
+  return (pid_t) pi->hProcess;
+
+ error:
+  if (env_block)
+    free (env_block);
+  if (cmdline)
+    free (cmdline);
+  if (full_executable)
+    free (full_executable);
+
+  return (pid_t) -1;
+}
+
+/* Spawn a script.  This simulates the Unix script execution mechanism.
+   This function is called as a fallback if win32_spawn fails. */
+
+static pid_t
+spawn_script (const char *executable, char *const *argv,
+              char* const *env,
+	      DWORD dwCreationFlags,
+	      LPSTARTUPINFO si,
+	      LPPROCESS_INFORMATION pi)
+{
+  pid_t pid = (pid_t) -1;
+  int save_errno = errno;
+  int fd = _open (executable, _O_RDONLY);
+
+  /* Try to open script, check header format, extract interpreter path,
+     and spawn script using that interpretter. */
+  if (fd >= 0)
+    {
+      char buf[MAX_PATH + 5];
+      int len = _read (fd, buf, sizeof (buf) - 1);
+      _close (fd);
+      if (len > 3)
+	{
+	  char *eol;
+	  buf[len] = '\0';
+	  eol = strchr (buf, '\n');
+	  if (eol && strncmp (buf, "#!", 2) == 0)
+	    {
+            
+	      /* Header format is OK. */
+	      char *executable1;
+              int new_argc;
+              const char **avhere;
+
+	      /* Extract interpreter path. */
+	      do
+		*eol = '\0';
+	      while (*--eol == '\r' || *eol == ' ' || *eol == '\t');
+	      for (executable1 = buf + 2; *executable1 == ' ' || *executable1 == '\t'; executable1++)
+		continue;
+	      backslashify (executable1);
+
+	      /* Duplicate argv, prepending the interpreter path. */
+	      new_argc = argv_to_argc (argv) + 1;
+	      avhere = XNEWVEC (const char *, new_argc + 1);
+	      *avhere = executable1;
+	      memcpy (avhere + 1, argv, new_argc * sizeof(*argv));
+	      argv = (char *const *)avhere;
+
+	      /* Spawn the child. */
+#ifndef USE_MINGW_MSYS
+	      executable = strrchr (executable1, '\\') + 1;
+	      if (!executable)
+		executable = executable1;
+	      pid = win32_spawn (executable, TRUE, argv, env,
+				 dwCreationFlags, si, pi);
+#else
+	      if (strchr (executable1, '\\') == NULL)
+		pid = win32_spawn (executable1, TRUE, argv, env,
+				   dwCreationFlags, si, pi);
+	      else if (executable1[0] != '\\')
+		pid = win32_spawn (executable1, FALSE, argv, env,
+				   dwCreationFlags, si, pi);
+	      else
+		{
+		  const char *newex = mingw_rootify (executable1);
+		  *avhere = newex;
+		  pid = win32_spawn (newex, FALSE, argv, env,
+				     dwCreationFlags, si, pi);
+		  if (executable1 != newex)
+		    free ((char *) newex);
+		  if ((long) pid < 0)
+		    {
+		      newex = msys_rootify (executable1);
+		      if (newex != executable1)
+			{
+			  *avhere = newex;
+			  pid = win32_spawn (newex, FALSE, argv, env,
+					     dwCreationFlags, si, pi);
+			  free ((char *) newex);
+			}
+		    }
+		}
+#endif
+	      free (avhere);
+	    }
+	}
+    }
+  if ((long) pid < 0)
+    errno = save_errno;
+  return pid;
+}
+
+/* Execute a child.  */
+
+static pid_t
+pex_win32_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED, int flags,
+		      const char *executable, char * const * argv,
+                      char* const* env,
+		      int in, int out, int errdes,
+		      int toclose ATTRIBUTE_UNUSED,
+		      const char **errmsg,
+		      int *err)
+{
+  pid_t pid;
+  HANDLE stdin_handle;
+  HANDLE stdout_handle;
+  HANDLE stderr_handle;
+  DWORD dwCreationFlags;
+  OSVERSIONINFO version_info;
+  STARTUPINFO si;
+  PROCESS_INFORMATION pi;
+
+  stdin_handle = INVALID_HANDLE_VALUE;
+  stdout_handle = INVALID_HANDLE_VALUE;
+  stderr_handle = INVALID_HANDLE_VALUE;
+
+  stdin_handle = (HANDLE) _get_osfhandle (in);
+  stdout_handle = (HANDLE) _get_osfhandle (out);
+  if (!(flags & PEX_STDERR_TO_STDOUT))
+    stderr_handle = (HANDLE) _get_osfhandle (errdes);
+  else
+    stderr_handle = stdout_handle;
+
+  /* Determine the version of Windows we are running on.  */
+  version_info.dwOSVersionInfoSize = sizeof (version_info); 
+  GetVersionEx (&version_info);
+  if (version_info.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
+    /* On Windows 95/98/ME the CREATE_NO_WINDOW flag is not
+       supported, so we cannot avoid creating a console window.  */
+    dwCreationFlags = 0;
+  else
+    {
+      HANDLE conout_handle;
+
+      /* Determine whether or not we have an associated console.  */
+      conout_handle = CreateFile("CONOUT$", 
+				 GENERIC_WRITE,
+				 FILE_SHARE_WRITE,
+				 /*lpSecurityAttributes=*/NULL,
+				 OPEN_EXISTING,
+				 FILE_ATTRIBUTE_NORMAL,
+				 /*hTemplateFile=*/NULL);
+      if (conout_handle == INVALID_HANDLE_VALUE)
+	/* There is no console associated with this process.  Since
+	   the child is a console process, the OS would normally
+	   create a new console Window for the child.  Since we'll be
+	   redirecting the child's standard streams, we do not need
+	   the console window.  */ 
+	dwCreationFlags = CREATE_NO_WINDOW;
+      else 
+	{
+	  /* There is a console associated with the process, so the OS
+	     will not create a new console.  And, if we use
+	     CREATE_NO_WINDOW in this situation, the child will have
+	     no associated console.  Therefore, if the child's
+	     standard streams are connected to the console, the output
+	     will be discarded.  */
+	  CloseHandle(conout_handle);
+	  dwCreationFlags = 0;
+	}
+    }
+
+  /* Since the child will be a console process, it will, by default,
+     connect standard input/output to its console.  However, we want
+     the child to use the handles specifically designated above.  In
+     addition, if there is no console (such as when we are running in
+     a Cygwin X window), then we must redirect the child's
+     input/output, as there is no console for the child to use.  */
+  memset (&si, 0, sizeof (si));
+  si.cb = sizeof (si);
+  si.dwFlags = STARTF_USESTDHANDLES;
+  si.hStdInput = stdin_handle;
+  si.hStdOutput = stdout_handle;
+  si.hStdError = stderr_handle;
+
+  /* Create the child process.  */  
+  pid = win32_spawn (executable, (flags & PEX_SEARCH) != 0,
+		     argv, env, dwCreationFlags, &si, &pi);
+  if (pid == (pid_t) -1)
+    pid = spawn_script (executable, argv, env, dwCreationFlags,
+                        &si, &pi);
+  if (pid == (pid_t) -1)
+    {
+      *err = ENOENT;
+      *errmsg = "CreateProcess";
+    }
+
+  /* Close the standard output and standard error handles in the
+     parent.  */ 
+  if (out != STDOUT_FILENO)
+    obj->funcs->close (obj, out);
+  if (errdes != STDERR_FILENO)
+    obj->funcs->close (obj, errdes);
+
+  return pid;
+}
+
+/* Wait for a child process to complete.  MS CRTDLL doesn't return
+   enough information in status to decide if the child exited due to a
+   signal or not, rather it simply returns an integer with the exit
+   code of the child; eg., if the child exited with an abort() call
+   and didn't have a handler for SIGABRT, it simply returns with
+   status == 3.  We fix the status code to conform to the usual WIF*
+   macros.  Note that WIFSIGNALED will never be true under CRTDLL. */
+
+static int
+pex_win32_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid,
+		int *status, struct pex_time *time, int done ATTRIBUTE_UNUSED,
+		const char **errmsg, int *err)
+{
+  DWORD termstat;
+  HANDLE h;
+
+  if (time != NULL)
+    memset (time, 0, sizeof *time);
+
+  h = (HANDLE) pid;
+
+  /* FIXME: If done is non-zero, we should probably try to kill the
+     process.  */
+  if (WaitForSingleObject (h, INFINITE) != WAIT_OBJECT_0)
+    {
+      CloseHandle (h);
+      *err = ECHILD;
+      *errmsg = "WaitForSingleObject";
+      return -1;
+    }
+
+  GetExitCodeProcess (h, &termstat);
+  CloseHandle (h);
+ 
+  /* A value of 3 indicates that the child caught a signal, but not
+     which one.  Since only SIGABRT, SIGFPE and SIGINT do anything, we
+     report SIGABRT.  */
+  if (termstat == 3)
+    *status = SIGABRT;
+  else
+    *status = (termstat & 0xff) << 8;
+
+  return 0;
+}
+
+/* Create a pipe.  */
+
+static int
+pex_win32_pipe (struct pex_obj *obj ATTRIBUTE_UNUSED, int *p,
+		int binary)
+{
+  return _pipe (p, 256, binary ? _O_BINARY : _O_TEXT);
+}
+
+/* Get a FILE pointer to read from a file descriptor.  */
+
+static FILE *
+pex_win32_fdopenr (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
+		   int binary)
+{
+  return fdopen (fd, binary ? "rb" : "r");
+}
+
+static FILE *
+pex_win32_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
+		   int binary)
+{
+  HANDLE h = (HANDLE) _get_osfhandle (fd);
+  if (h == INVALID_HANDLE_VALUE)
+    return NULL;
+  if (! SetHandleInformation (h, HANDLE_FLAG_INHERIT, 0))
+    return NULL;
+  return fdopen (fd, binary ? "wb" : "w");
+}
+
+#ifdef MAIN
+#include <stdio.h>
+
+int
+main (int argc ATTRIBUTE_UNUSED, char **argv)
+{
+  char const *errmsg;
+  int err;
+  argv++;
+  printf ("%ld\n", (long) pex_win32_exec_child (NULL, PEX_SEARCH, argv[0], argv, NULL, 0, 0, 1, 2, &errmsg, &err));
+  exit (0);
+}
+#endif