gspawn-win32.c 41.8 KB
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/* gspawn-win32.c - Process launching on Win32
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 *
 *  Copyright 2000 Red Hat, Inc.
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 *  Copyright 2003 Tor Lillqvist
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 *
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 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
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 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, see <http://www.gnu.org/licenses/>.
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 */

/*
 * Implementation details on Win32.
 *
 * - There is no way to set the no-inherit flag for
 *   a "file descriptor" in the MS C runtime. The flag is there,
 *   and the dospawn() function uses it, but unfortunately
 *   this flag can only be set when opening the file.
 * - As there is no fork(), we cannot reliably change directory
 *   before starting the child process. (There might be several threads
 *   running, and the current directory is common for all threads.)
 *
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 * Thus, we must in many cases use a helper program to handle closing
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 * of (inherited) file descriptors and changing of directory. The
 * helper process is also needed if the standard input, standard
 * output, or standard error of the process to be run are supposed to
 * be redirected somewhere.
 *
 * The structure of the source code in this file is a mess, I know.
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 */

/* Define this to get some logging all the time */
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/* #define G_SPAWN_WIN32_DEBUG */
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#include "config.h"
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#include "glib.h"
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#include "glib-private.h"
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#include "gprintfint.h"
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#include "glibintl.h"
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#include "gspawn-private.h"
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#include "gthread.h"
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#include <string.h>
#include <stdlib.h>
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#include <stdio.h>
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#include <windows.h>
#include <errno.h>
#include <fcntl.h>
#include <io.h>
#include <process.h>
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#include <direct.h>
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#include <wchar.h>
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#ifndef GSPAWN_HELPER
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#ifdef G_SPAWN_WIN32_DEBUG
  static int debug = 1;
  #define SETUP_DEBUG() /* empty */
#else
  static int debug = -1;
  #define SETUP_DEBUG()					\
    G_STMT_START					\
      {							\
	if (debug == -1)				\
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	  {						\
	    if (getenv ("G_SPAWN_WIN32_DEBUG") != NULL)	\
	      debug = 1;				\
	    else					\
	      debug = 0;				\
	  }						\
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      }							\
    G_STMT_END
#endif
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#endif
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enum
{
  CHILD_NO_ERROR,
  CHILD_CHDIR_FAILED,
  CHILD_SPAWN_FAILED,
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  CHILD_SPAWN_NOENT,
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};

enum {
  ARG_CHILD_ERR_REPORT = 1,
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  ARG_HELPER_SYNC,
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  ARG_STDIN,
  ARG_STDOUT,
  ARG_STDERR,
  ARG_WORKING_DIRECTORY,
  ARG_CLOSE_DESCRIPTORS,
  ARG_USE_PATH,
  ARG_WAIT,
  ARG_PROGRAM,
  ARG_COUNT = ARG_PROGRAM
};

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static int
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reopen_noninherited (int fd,
		     int mode)
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{
  HANDLE filehandle;

  DuplicateHandle (GetCurrentProcess (), (LPHANDLE) _get_osfhandle (fd),
		   GetCurrentProcess (), &filehandle,
		   0, FALSE, DUPLICATE_SAME_ACCESS);
  close (fd);
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  return _open_osfhandle ((gintptr) filehandle, mode | _O_NOINHERIT);
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}

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#ifndef GSPAWN_HELPER

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#ifdef _WIN64
#define HELPER_PROCESS "gspawn-win64-helper"
#else
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#define HELPER_PROCESS "gspawn-win32-helper"
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#endif
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/* This logic has a copy for wchar_t in gspawn-win32-helper.c, protect_wargv() */
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static gchar *
protect_argv_string (const gchar *string)
{
  const gchar *p = string;
  gchar *retval, *q;
  gint len = 0;
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  gint pre_bslash = 0;
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  gboolean need_dblquotes = FALSE;
  while (*p)
    {
      if (*p == ' ' || *p == '\t')
	need_dblquotes = TRUE;
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      /* estimate max len, assuming that all escapable chracters will be escaped */
      if (*p == '"' || *p == '\\')
	len += 2;
      else
	len += 1;
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      p++;
    }
  
  q = retval = g_malloc (len + need_dblquotes*2 + 1);
  p = string;

  if (need_dblquotes)
    *q++ = '"';
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  /* Only quotes and backslashes preceeding quotes are escaped:
   * see "Parsing C Command-Line Arguments" at
   * https://docs.microsoft.com/en-us/cpp/c-language/parsing-c-command-line-arguments
   */
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  while (*p)
    {
      if (*p == '"')
	{
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	  /* Add backslash for escaping quote itself */
	  *q++ = '\\';
	  /* Add backslash for every preceeding backslash for escaping it */
	  for (;pre_bslash > 0; --pre_bslash)
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	    *q++ = '\\';
	}
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      /* Count length of continuous sequence of preceeding backslashes. */
      if (*p == '\\')
	++pre_bslash;
      else
	pre_bslash = 0;

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      *q++ = *p;
      p++;
    }
  
  if (need_dblquotes)
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    {
      /* Add backslash for every preceeding backslash for escaping it,
       * do NOT escape quote itself.
       */
      for (;pre_bslash > 0; --pre_bslash)
	*q++ = '\\';
      *q++ = '"';
    }
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  *q++ = '\0';

  return retval;
}

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static gint
protect_argv (gchar  **argv,
	      gchar ***new_argv)
{
  gint i;
  gint argc = 0;
  
  while (argv[argc])
    ++argc;
  *new_argv = g_new (gchar *, argc+1);

  /* Quote each argv element if necessary, so that it will get
   * reconstructed correctly in the C runtime startup code.  Note that
   * the unquoting algorithm in the C runtime is really weird, and
   * rather different than what Unix shells do. See stdargv.c in the C
   * runtime sources (in the Platform SDK, in src/crt).
   *
   * Note that an new_argv[0] constructed by this function should
   * *not* be passed as the filename argument to a spawn* or exec*
   * family function. That argument should be the real file name
   * without any quoting.
   */
  for (i = 0; i < argc; i++)
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    (*new_argv)[i] = protect_argv_string (argv[i]);
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  (*new_argv)[argc] = NULL;

  return argc;
}

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G_DEFINE_QUARK (g-exec-error-quark, g_spawn_error)
G_DEFINE_QUARK (g-spawn-exit-error-quark, g_spawn_exit_error)
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gboolean
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g_spawn_async (const gchar          *working_directory,
               gchar               **argv,
               gchar               **envp,
               GSpawnFlags           flags,
               GSpawnChildSetupFunc  child_setup,
               gpointer              user_data,
               GPid                 *child_handle,
               GError              **error)
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{
  g_return_val_if_fail (argv != NULL, FALSE);
  
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  return g_spawn_async_with_pipes (working_directory,
                                   argv, envp,
                                   flags,
                                   child_setup,
                                   user_data,
                                   child_handle,
                                   NULL, NULL, NULL,
                                   error);
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}

/* Avoids a danger in threaded situations (calling close()
 * on a file descriptor twice, and another thread has
 * re-opened it since the first close)
 */
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static void
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close_and_invalidate (gint *fd)
{
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  if (*fd < 0)
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    return;
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  close (*fd);
  *fd = -1;
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}

typedef enum
{
  READ_FAILED = 0, /* FALSE */
  READ_OK,
  READ_EOF
} ReadResult;

static ReadResult
read_data (GString     *str,
           GIOChannel  *iochannel,
           GError     **error)
{
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  GIOStatus giostatus;
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  gsize bytes;
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  gchar buf[4096];

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  giostatus = g_io_channel_read_chars (iochannel, buf, sizeof (buf), &bytes, NULL);
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  if (bytes == 0)
    return READ_EOF;
  else if (bytes > 0)
    {
      g_string_append_len (str, buf, bytes);
      return READ_OK;
    }
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  else if (giostatus == G_IO_STATUS_AGAIN)
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    goto again;
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  else if (giostatus == G_IO_STATUS_ERROR)
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    {
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      g_set_error_literal (error, G_SPAWN_ERROR, G_SPAWN_ERROR_READ,
                           _("Failed to read data from child process"));
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      return READ_FAILED;
    }
  else
    return READ_OK;
}

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static gboolean
make_pipe (gint     p[2],
           GError **error)
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{
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  if (_pipe (p, 4096, _O_BINARY) < 0)
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    {
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      int errsv = errno;

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      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
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                   _("Failed to create pipe for communicating with child process (%s)"),
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                   g_strerror (errsv));
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      return FALSE;
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    }
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  else
    return TRUE;
}
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/* The helper process writes a status report back to us, through a
 * pipe, consisting of two ints.
 */
static gboolean
read_helper_report (int      fd,
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		    gintptr  report[2],
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		    GError **error)
{
  gint bytes = 0;
  
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  while (bytes < sizeof(gintptr)*2)
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    {
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      gint chunk;
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      int errsv;
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      if (debug)
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	g_print ("%s:read_helper_report: read %" G_GSIZE_FORMAT "...\n",
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		 __FILE__,
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		 sizeof(gintptr)*2 - bytes);
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      chunk = read (fd, ((gchar*)report) + bytes,
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		    sizeof(gintptr)*2 - bytes);
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      errsv = errno;
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      if (debug)
	g_print ("...got %d bytes\n", chunk);
          
      if (chunk < 0)
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        {
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          /* Some weird shit happened, bail out */
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          g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
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                       _("Failed to read from child pipe (%s)"),
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                       g_strerror (errsv));
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          return FALSE;
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        }
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      else if (chunk == 0)
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	{
	  g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
		       _("Failed to read from child pipe (%s)"),
		       "EOF");
	  break; /* EOF */
	}
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      else
	bytes += chunk;
    }
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  if (bytes < sizeof(gintptr)*2)
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    return FALSE;
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  return TRUE;
}

static void
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set_child_error (gintptr      report[2],
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		 const gchar *working_directory,
		 GError     **error)
{
  switch (report[0])
    {
    case CHILD_CHDIR_FAILED:
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      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_CHDIR,
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		   _("Failed to change to directory “%s” (%s)"),
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		   working_directory,
		   g_strerror (report[1]));
      break;
    case CHILD_SPAWN_FAILED:
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      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
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		   _("Failed to execute child process (%s)"),
		   g_strerror (report[1]));
      break;
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    case CHILD_SPAWN_NOENT:
      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_NOENT,
                   _("Failed to execute child process (%s)"),
                   g_strerror (report[1]));
      break;
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    default:
      g_assert_not_reached ();
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    }
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}
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static gboolean
utf8_charv_to_wcharv (char     **utf8_charv,
		      wchar_t ***wcharv,
		      int       *error_index,
		      GError   **error)
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{
  wchar_t **retval = NULL;

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  *wcharv = NULL;
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  if (utf8_charv != NULL)
    {
      int n = 0, i;

      while (utf8_charv[n])
	n++;
      retval = g_new (wchar_t *, n + 1);

      for (i = 0; i < n; i++)
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	{
	  retval[i] = g_utf8_to_utf16 (utf8_charv[i], -1, NULL, NULL, error);
	  if (retval[i] == NULL)
	    {
	      if (error_index)
		*error_index = i;
	      while (i)
		g_free (retval[--i]);
	      g_free (retval);
	      return FALSE;
	    }
	}
	    
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      retval[n] = NULL;
    }
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  *wcharv = retval;
  return TRUE;
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}

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static gboolean
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do_spawn_directly (gint                 *exit_status,
		   gboolean		 do_return_handle,
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		   GSpawnFlags           flags,
		   gchar               **argv,
		   char                **envp,
		   char                **protected_argv,
		   GPid                 *child_handle,
		   GError              **error)     
{
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  const int mode = (exit_status == NULL) ? P_NOWAIT : P_WAIT;
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  char **new_argv;
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  gintptr rc = -1;
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  int errsv;
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  GError *conv_error = NULL;
  gint conv_error_index;
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  wchar_t *wargv0, **wargv, **wenvp;
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  new_argv = (flags & G_SPAWN_FILE_AND_ARGV_ZERO) ? protected_argv + 1 : protected_argv;
      
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  wargv0 = g_utf8_to_utf16 (argv[0], -1, NULL, NULL, &conv_error);
  if (wargv0 == NULL)
    {
      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
		   _("Invalid program name: %s"),
		   conv_error->message);
      g_error_free (conv_error);
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      return FALSE;
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    }
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  if (!utf8_charv_to_wcharv (new_argv, &wargv, &conv_error_index, &conv_error))
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    {
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      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
		   _("Invalid string in argument vector at %d: %s"),
		   conv_error_index, conv_error->message);
      g_error_free (conv_error);
      g_free (wargv0);
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      return FALSE;
    }
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  if (!utf8_charv_to_wcharv (envp, &wenvp, NULL, &conv_error))
    {
      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
		   _("Invalid string in environment: %s"),
		   conv_error->message);
      g_error_free (conv_error);
      g_free (wargv0);
      g_strfreev ((gchar **) wargv);
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      return FALSE;
    }
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  if (flags & G_SPAWN_SEARCH_PATH)
    if (wenvp != NULL)
      rc = _wspawnvpe (mode, wargv0, (const wchar_t **) wargv, (const wchar_t **) wenvp);
    else
      rc = _wspawnvp (mode, wargv0, (const wchar_t **) wargv);
  else
    if (wenvp != NULL)
      rc = _wspawnve (mode, wargv0, (const wchar_t **) wargv, (const wchar_t **) wenvp);
    else
      rc = _wspawnv (mode, wargv0, (const wchar_t **) wargv);
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  errsv = errno;

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  g_free (wargv0);
  g_strfreev ((gchar **) wargv);
  g_strfreev ((gchar **) wenvp);
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  if (rc == -1 && errsv != 0)
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    {
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      g_set_error (error, G_SPAWN_ERROR, _g_spawn_exec_err_to_g_error (errsv),
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		   _("Failed to execute child process (%s)"),
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		   g_strerror (errsv));
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      return FALSE;
    }

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  if (exit_status == NULL)
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    {
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      if (child_handle && do_return_handle)
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	*child_handle = (GPid) rc;
      else
	{
	  CloseHandle ((HANDLE) rc);
	  if (child_handle)
	    *child_handle = 0;
	}
    }
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  else
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    *exit_status = rc;

  return TRUE;
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}

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static gboolean
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do_spawn_with_fds (gint                 *exit_status,
		   gboolean		   do_return_handle,
		   const gchar          *working_directory,
		   gchar               **argv,
		   char                **envp,
		   GSpawnFlags           flags,
		   GSpawnChildSetupFunc  child_setup,
		   GPid                 *child_handle,
		   gint                  stdin_fd,
		   gint                  stdout_fd,
		   gint                  stderr_fd,
		   gint		  *err_report,
		   GError              **error)
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{
  char **protected_argv;
  char args[ARG_COUNT][10];
  char **new_argv;
  int i;
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  gintptr rc = -1;
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  int errsv;
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  int argc;
  int child_err_report_pipe[2] = { -1, -1 };
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  int helper_sync_pipe[2] = { -1, -1 };
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  gintptr helper_report[2];
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  static gboolean warned_about_child_setup = FALSE;
  GError *conv_error = NULL;
  gint conv_error_index;
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  gchar *helper_process;
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  wchar_t *whelper, **wargv, **wenvp;
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  gchar *glib_dll_directory;
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  if (child_setup && !warned_about_child_setup)
    {
      warned_about_child_setup = TRUE;
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      g_warning ("passing a child setup function to the g_spawn functions is pointless on Windows and it is ignored");
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    }

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  argc = protect_argv (argv, &protected_argv);
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  if (stdin_fd == -1 && stdout_fd == -1 && stderr_fd == -1 &&
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      (flags & G_SPAWN_CHILD_INHERITS_STDIN) &&
      !(flags & G_SPAWN_STDOUT_TO_DEV_NULL) &&
      !(flags & G_SPAWN_STDERR_TO_DEV_NULL) &&
      (working_directory == NULL || !*working_directory) &&
      (flags & G_SPAWN_LEAVE_DESCRIPTORS_OPEN))
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    {
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      /* We can do without the helper process */
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      gboolean retval =
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	do_spawn_directly (exit_status, do_return_handle, flags,
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			   argv, envp, protected_argv,
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			   child_handle, error);
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      g_strfreev (protected_argv);
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      return retval;
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    }

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  if (!make_pipe (child_err_report_pipe, error))
    goto cleanup_and_fail;
  
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  if (!make_pipe (helper_sync_pipe, error))
    goto cleanup_and_fail;
  
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  new_argv = g_new (char *, argc + 1 + ARG_COUNT);
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  if (GetConsoleWindow () != NULL)
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    helper_process = HELPER_PROCESS "-console.exe";
  else
    helper_process = HELPER_PROCESS ".exe";
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  glib_dll_directory = _glib_get_dll_directory ();
  if (glib_dll_directory != NULL)
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    {
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      helper_process = g_build_filename (glib_dll_directory, helper_process, NULL);
      g_free (glib_dll_directory);
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    }
  else
    helper_process = g_strdup (helper_process);
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  new_argv[0] = protect_argv_string (helper_process);
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  _g_sprintf (args[ARG_CHILD_ERR_REPORT], "%d", child_err_report_pipe[1]);
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  new_argv[ARG_CHILD_ERR_REPORT] = args[ARG_CHILD_ERR_REPORT];
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  /* Make the read end of the child error report pipe
   * noninherited. Otherwise it will needlessly be inherited by the
   * helper process, and the started actual user process. As such that
   * shouldn't harm, but it is unnecessary.
   */
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  child_err_report_pipe[0] = reopen_noninherited (child_err_report_pipe[0], _O_RDONLY);
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  if (flags & G_SPAWN_FILE_AND_ARGV_ZERO)
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    {
      /* Overload ARG_CHILD_ERR_REPORT to also encode the
       * G_SPAWN_FILE_AND_ARGV_ZERO functionality.
       */
      strcat (args[ARG_CHILD_ERR_REPORT], "#");
    }
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  _g_sprintf (args[ARG_HELPER_SYNC], "%d", helper_sync_pipe[0]);
  new_argv[ARG_HELPER_SYNC] = args[ARG_HELPER_SYNC];
  
  /* Make the write end of the sync pipe noninherited. Otherwise the
   * helper process will inherit it, and thus if this process happens
   * to crash before writing the sync byte to the pipe, the helper
   * process won't read but won't get any EOF either, as it has the
   * write end open itself.
   */
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  helper_sync_pipe[1] = reopen_noninherited (helper_sync_pipe[1], _O_WRONLY);
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  if (stdin_fd != -1)
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    {
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      _g_sprintf (args[ARG_STDIN], "%d", stdin_fd);
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      new_argv[ARG_STDIN] = args[ARG_STDIN];
    }
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  else if (flags & G_SPAWN_CHILD_INHERITS_STDIN)
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    {
      /* Let stdin be alone */
      new_argv[ARG_STDIN] = "-";
    }
  else
    {
      /* Keep process from blocking on a read of stdin */
      new_argv[ARG_STDIN] = "z";
    }
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657
  if (stdout_fd != -1)
658
    {
659
      _g_sprintf (args[ARG_STDOUT], "%d", stdout_fd);
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      new_argv[ARG_STDOUT] = args[ARG_STDOUT];
    }
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  else if (flags & G_SPAWN_STDOUT_TO_DEV_NULL)
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    {
      new_argv[ARG_STDOUT] = "z";
    }
  else
    {
      new_argv[ARG_STDOUT] = "-";
    }
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671
  if (stderr_fd != -1)
672
    {
673
      _g_sprintf (args[ARG_STDERR], "%d", stderr_fd);
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      new_argv[ARG_STDERR] = args[ARG_STDERR];
    }
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  else if (flags & G_SPAWN_STDERR_TO_DEV_NULL)
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    {
      new_argv[ARG_STDERR] = "z";
    }
  else
    {
      new_argv[ARG_STDERR] = "-";
    }
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685
  if (working_directory && *working_directory)
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    new_argv[ARG_WORKING_DIRECTORY] = protect_argv_string (working_directory);
687
  else
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    new_argv[ARG_WORKING_DIRECTORY] = g_strdup ("-");
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  if (!(flags & G_SPAWN_LEAVE_DESCRIPTORS_OPEN))
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    new_argv[ARG_CLOSE_DESCRIPTORS] = "y";
  else
    new_argv[ARG_CLOSE_DESCRIPTORS] = "-";

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  if (flags & G_SPAWN_SEARCH_PATH)
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    new_argv[ARG_USE_PATH] = "y";
  else
    new_argv[ARG_USE_PATH] = "-";

700
  if (exit_status == NULL)
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    new_argv[ARG_WAIT] = "-";
  else
    new_argv[ARG_WAIT] = "w";

  for (i = 0; i <= argc; i++)
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    new_argv[ARG_PROGRAM + i] = protected_argv[i];
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  SETUP_DEBUG();

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  if (debug)
    {
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      g_print ("calling %s with argv:\n", helper_process);
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      for (i = 0; i < argc + 1 + ARG_COUNT; i++)
	g_print ("argv[%d]: %s\n", i, (new_argv[i] ? new_argv[i] : "NULL"));
    }
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  if (!utf8_charv_to_wcharv (new_argv, &wargv, &conv_error_index, &conv_error))
    {
      if (conv_error_index == ARG_WORKING_DIRECTORY)
	g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_CHDIR,
		     _("Invalid working directory: %s"),
		     conv_error->message);
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      else
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	g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
		     _("Invalid string in argument vector at %d: %s"),
		     conv_error_index - ARG_PROGRAM, conv_error->message);
      g_error_free (conv_error);
      g_strfreev (protected_argv);
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      g_free (new_argv[0]);
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      g_free (new_argv[ARG_WORKING_DIRECTORY]);
      g_free (new_argv);
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      g_free (helper_process);
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      goto cleanup_and_fail;
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    }
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  if (!utf8_charv_to_wcharv (envp, &wenvp, NULL, &conv_error))
    {
      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
		   _("Invalid string in environment: %s"),
		   conv_error->message);
      g_error_free (conv_error);
      g_strfreev (protected_argv);
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      g_free (new_argv[0]);
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      g_free (new_argv[ARG_WORKING_DIRECTORY]);
      g_free (new_argv);
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      g_free (helper_process);
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      g_strfreev ((gchar **) wargv);
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      goto cleanup_and_fail;
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    }
752

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  whelper = g_utf8_to_utf16 (helper_process, -1, NULL, NULL, NULL);
  g_free (helper_process);

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  if (wenvp != NULL)
    rc = _wspawnvpe (P_NOWAIT, whelper, (const wchar_t **) wargv, (const wchar_t **) wenvp);
  else
    rc = _wspawnvp (P_NOWAIT, whelper, (const wchar_t **) wargv);
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  errsv = errno;
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  g_free (whelper);
  g_strfreev ((gchar **) wargv);
  g_strfreev ((gchar **) wenvp);
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  /* Close the other process's ends of the pipes in this process,
   * otherwise the reader will never get EOF.
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   */
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  close_and_invalidate (&child_err_report_pipe[1]);
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  close_and_invalidate (&helper_sync_pipe[0]);
772

773
  g_strfreev (protected_argv);
774

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  g_free (new_argv[0]);
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  g_free (new_argv[ARG_WORKING_DIRECTORY]);
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  g_free (new_argv);

779
  /* Check if gspawn-win32-helper couldn't be run */
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  if (rc == -1 && errsv != 0)
781
    {
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      g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
		   _("Failed to execute helper program (%s)"),
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		   g_strerror (errsv));
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      goto cleanup_and_fail;
    }

788
  if (exit_status != NULL)
789
    {
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      /* Synchronous case. Pass helper's report pipe back to caller,
       * which takes care of reading it after the grandchild has
       * finished.
       */
      g_assert (err_report != NULL);
      *err_report = child_err_report_pipe[0];
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      write (helper_sync_pipe[1], " ", 1);
      close_and_invalidate (&helper_sync_pipe[1]);
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    }
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  else
800
    {
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      /* Asynchronous case. We read the helper's report right away. */
      if (!read_helper_report (child_err_report_pipe[0], helper_report, error))
	goto cleanup_and_fail;
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      close_and_invalidate (&child_err_report_pipe[0]);
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      switch (helper_report[0])
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	{
809
	case CHILD_NO_ERROR:
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	  if (child_handle && do_return_handle)
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	    {
	      /* rc is our HANDLE for gspawn-win32-helper. It has
	       * told us the HANDLE of its child. Duplicate that into
	       * a HANDLE valid in this process.
	       */
	      if (!DuplicateHandle ((HANDLE) rc, (HANDLE) helper_report[1],
				    GetCurrentProcess (), (LPHANDLE) child_handle,
				    0, TRUE, DUPLICATE_SAME_ACCESS))
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		{
		  char *emsg = g_win32_error_message (GetLastError ());
		  g_print("%s\n", emsg);
		  *child_handle = 0;
		}
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	    }
	  else if (child_handle)
826
	    *child_handle = 0;
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	  write (helper_sync_pipe[1], " ", 1);
	  close_and_invalidate (&helper_sync_pipe[1]);
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	  break;
	  
	default:
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	  write (helper_sync_pipe[1], " ", 1);
	  close_and_invalidate (&helper_sync_pipe[1]);
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	  set_child_error (helper_report, working_directory, error);
	  goto cleanup_and_fail;
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	}
    }

  /* Success against all odds! return the information */
      
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  if (rc != -1)
    CloseHandle ((HANDLE) rc);
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  return TRUE;

 cleanup_and_fail:
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  if (rc != -1)
    CloseHandle ((HANDLE) rc);
  if (child_err_report_pipe[0] != -1)
    close (child_err_report_pipe[0]);
  if (child_err_report_pipe[1] != -1)
    close (child_err_report_pipe[1]);
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  if (helper_sync_pipe[0] != -1)
    close (helper_sync_pipe[0]);
  if (helper_sync_pipe[1] != -1)
    close (helper_sync_pipe[1]);
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  return FALSE;
}

static gboolean
do_spawn_with_pipes (gint                 *exit_status,
		     gboolean		   do_return_handle,
		     const gchar          *working_directory,
		     gchar               **argv,
		     char                **envp,
		     GSpawnFlags           flags,
		     GSpawnChildSetupFunc  child_setup,
		     GPid                 *child_handle,
		     gint                 *standard_input,
		     gint                 *standard_output,
		     gint                 *standard_error,
		     gint		  *err_report,
		     GError              **error)
{
  int stdin_pipe[2] = { -1, -1 };
  int stdout_pipe[2] = { -1, -1 };
  int stderr_pipe[2] = { -1, -1 };

  if (standard_input && !make_pipe (stdin_pipe, error))
    goto cleanup_and_fail;

  if (standard_output && !make_pipe (stdout_pipe, error))
    goto cleanup_and_fail;

  if (standard_error && !make_pipe (stderr_pipe, error))
    goto cleanup_and_fail;

  if (!do_spawn_with_fds (exit_status,
			  do_return_handle,
			  working_directory,
			  argv,
			  envp,
			  flags,
			  child_setup,
			  child_handle,
			  stdin_pipe[0],
			  stdout_pipe[1],
			  stderr_pipe[1],
			  err_report,
			  error))
    goto cleanup_and_fail;

  /* Close the other process's ends of the pipes in this process,
   * otherwise the reader will never get EOF.
   */
  close_and_invalidate (&stdin_pipe[0]);
  close_and_invalidate (&stdout_pipe[1]);
  close_and_invalidate (&stderr_pipe[1]);

  if (standard_input)
    *standard_input = stdin_pipe[1];
  if (standard_output)
    *standard_output = stdout_pipe[0];
  if (standard_error)
    *standard_error = stderr_pipe[0];

  return TRUE;

 cleanup_and_fail:

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  if (stdin_pipe[0] != -1)
    close (stdin_pipe[0]);
  if (stdin_pipe[1] != -1)
    close (stdin_pipe[1]);
  if (stdout_pipe[0] != -1)
    close (stdout_pipe[0]);
  if (stdout_pipe[1] != -1)
    close (stdout_pipe[1]);
  if (stderr_pipe[0] != -1)
    close (stderr_pipe[0]);
  if (stderr_pipe[1] != -1)
    close (stderr_pipe[1]);
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  return FALSE;
}

939
gboolean
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g_spawn_sync (const gchar          *working_directory,
              gchar               **argv,
              gchar               **envp,
              GSpawnFlags           flags,
              GSpawnChildSetupFunc  child_setup,
              gpointer              user_data,
              gchar               **standard_output,
              gchar               **standard_error,
              gint                 *exit_status,
              GError              **error)
950
{
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  gint outpipe = -1;
  gint errpipe = -1;
  gint reportpipe = -1;
  GIOChannel *outchannel = NULL;
  GIOChannel *errchannel = NULL;
  GPollFD outfd, errfd;
  GPollFD fds[2];
  gint nfds;
  gint outindex = -1;
  gint errindex = -1;
  gint ret;
  GString *outstr = NULL;
  GString *errstr = NULL;
  gboolean failed;
  gint status;
  
  g_return_val_if_fail (argv != NULL, FALSE);
  g_return_val_if_fail (!(flags & G_SPAWN_DO_NOT_REAP_CHILD), FALSE);
  g_return_val_if_fail (standard_output == NULL ||
                        !(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE);
  g_return_val_if_fail (standard_error == NULL ||
                        !(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE);
  
  /* Just to ensure segfaults if callers try to use
   * these when an error is reported.
   */
  if (standard_output)
    *standard_output = NULL;

  if (standard_error)
    *standard_error = NULL;
  
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  if (!do_spawn_with_pipes (&status,
			    FALSE,
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			    working_directory,
			    argv,
			    envp,
			    flags,
			    child_setup,
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			    NULL,
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			    NULL,
			    standard_output ? &outpipe : NULL,
			    standard_error ? &errpipe : NULL,
			    &reportpipe,
			    error))
    return FALSE;

  /* Read data from child. */
  
  failed = FALSE;

  if (outpipe >= 0)
1003
    {
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      outstr = g_string_new (NULL);
      outchannel = g_io_channel_win32_new_fd (outpipe);
      g_io_channel_set_encoding (outchannel, NULL, NULL);
1007
      g_io_channel_set_buffered (outchannel, FALSE);
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      g_io_channel_win32_make_pollfd (outchannel,
				      G_IO_IN | G_IO_ERR | G_IO_HUP,
				      &outfd);
1011
      if (debug)
1012
	g_print ("outfd=%p\n", (HANDLE) outfd.fd);
1013 1014 1015 1016 1017 1018 1019
    }
      
  if (errpipe >= 0)
    {
      errstr = g_string_new (NULL);
      errchannel = g_io_channel_win32_new_fd (errpipe);
      g_io_channel_set_encoding (errchannel, NULL, NULL);
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      g_io_channel_set_buffered (errchannel, FALSE);
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      g_io_channel_win32_make_pollfd (errchannel,
				      G_IO_IN | G_IO_ERR | G_IO_HUP,
				      &errfd);
1024
      if (debug)
1025
	g_print ("errfd=%p\n", (HANDLE) errfd.fd);
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    }

  /* Read data until we get EOF on all pipes. */
  while (!failed && (outpipe >= 0 || errpipe >= 0))
    {
      nfds = 0;
      if (outpipe >= 0)
	{
	  fds[nfds] = outfd;
	  outindex = nfds;
	  nfds++;
	}
      if (errpipe >= 0)
	{
	  fds[nfds] = errfd;
	  errindex = nfds;
	  nfds++;
	}

      if (debug)
	g_print ("g_spawn_sync: calling g_io_channel_win32_poll, nfds=%d\n",
		 nfds);

      ret = g_io_channel_win32_poll (fds, nfds, -1);

      if (ret < 0)
        {
          failed = TRUE;

1055 1056
          g_set_error_literal (error, G_SPAWN_ERROR, G_SPAWN_ERROR_READ,
                               _("Unexpected error in g_io_channel_win32_poll() reading data from a child process"));
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          break;
        }

      if (outpipe >= 0 && (fds[outindex].revents & G_IO_IN))
        {
          switch (read_data (outstr, outchannel, error))
            {
            case READ_FAILED:
	      if (debug)
		g_print ("g_spawn_sync: outchannel: READ_FAILED\n");
              failed = TRUE;
              break;
            case READ_EOF:
	      if (debug)
		g_print ("g_spawn_sync: outchannel: READ_EOF\n");
              g_io_channel_unref (outchannel);
	      outchannel = NULL;
              close_and_invalidate (&outpipe);
              break;
            default:
	      if (debug)
		g_print ("g_spawn_sync: outchannel: OK\n");
              break;
            }

          if (failed)
            break;
        }

      if (errpipe >= 0 && (fds[errindex].revents & G_IO_IN))
        {
          switch (read_data (errstr, errchannel, error))
            {
            case READ_FAILED:
	      if (debug)
		g_print ("g_spawn_sync: errchannel: READ_FAILED\n");
              failed = TRUE;
              break;
            case READ_EOF:
	      if (debug)
		g_print ("g_spawn_sync: errchannel: READ_EOF\n");
	      g_io_channel_unref (errchannel);
	      errchannel = NULL;
              close_and_invalidate (&errpipe);
              break;
            default:
	      if (debug)
		g_print ("g_spawn_sync: errchannel: OK\n");
              break;
            }

          if (failed)
            break;
        }
    }

  if (reportpipe == -1)
    {
      /* No helper process, exit status of actual spawned process
       * already available.
       */
      if (exit_status)
        *exit_status = status;
    }
  else
    {
      /* Helper process was involved. Read its report now after the
       * grandchild has finished.
       */
1127
      gintptr helper_report[2];
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      if (!read_helper_report (reportpipe, helper_report, error))
	failed = TRUE;
      else
	{
	  switch (helper_report[0])
	    {
	    case CHILD_NO_ERROR:
	      if (exit_status)
		*exit_status = helper_report[1];
	      break;
	    default:
	      set_child_error (helper_report, working_directory, error);
	      failed = TRUE;
	      break;
	    }
	}
      close_and_invalidate (&reportpipe);
    }


  /* These should only be open still if we had an error.  */
  
  if (outchannel != NULL)
    g_io_channel_unref (outchannel);
  if (errchannel != NULL)
    g_io_channel_unref (errchannel);
  if (outpipe >= 0)
    close_and_invalidate (&outpipe);
  if (errpipe >= 0)
    close_and_invalidate (&errpipe);
  
  if (failed)
    {
      if (outstr)
        g_string_free (outstr, TRUE);
      if (errstr)
        g_string_free (errstr, TRUE);

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      return FALSE;
    }
  else
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    {
      if (standard_output)        
        *standard_output = g_string_free (outstr, FALSE);

      if (standard_error)
        *standard_error = g_string_free (errstr, FALSE);

      return TRUE;
    }
}

gboolean
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g_spawn_async_with_pipes (const gchar          *working_directory,
                          gchar               **argv,
                          gchar               **envp,
                          GSpawnFlags           flags,
                          GSpawnChildSetupFunc  child_setup,
                          gpointer              user_data,
                          GPid                 *child_handle,
                          gint                 *standard_input,
                          gint                 *standard_output,
                          gint                 *standard_error,
                          GError              **error)
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
{
  g_return_val_if_fail (argv != NULL, FALSE);
  g_return_val_if_fail (standard_output == NULL ||
                        !(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE);
  g_return_val_if_fail (standard_error == NULL ||
                        !(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE);
  /* can't inherit stdin if we have an input pipe. */
  g_return_val_if_fail (standard_input == NULL ||
                        !(flags & G_SPAWN_CHILD_INHERITS_STDIN), FALSE);
  
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  return do_spawn_with_pipes (NULL,
			      (flags & G_SPAWN_DO_NOT_REAP_CHILD),
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			      working_directory,
			      argv,
			      envp,
			      flags,
			      child_setup,
			      child_handle,
			      standard_input,
			      standard_output,
			      standard_error,
			      NULL,
			      error);
1216
}
1217

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gboolean
g_spawn_async_with_fds (const gchar          *working_directory,
                        gchar               **argv,
                        gchar               **envp,
                        GSpawnFlags           flags,
                        GSpawnChildSetupFunc  child_setup,
                        gpointer              user_data,
                        GPid                 *child_handle,
                        gint                  stdin_fd,
                        gint                  stdout_fd,
                        gint                  stderr_fd,
                        GError              **error)
{
  g_return_val_if_fail (argv != NULL, FALSE);
  g_return_val_if_fail (stdin_fd == -1 ||
                        !(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE);
  g_return_val_if_fail (stderr_fd == -1 ||
                        !(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE);
  /* can't inherit stdin if we have an input pipe. */
  g_return_val_if_fail (stdin_fd == -1 ||
                        !(flags & G_SPAWN_CHILD_INHERITS_STDIN), FALSE);

  return do_spawn_with_fds (NULL,
			    (flags & G_SPAWN_DO_NOT_REAP_CHILD),
			    working_directory,
			    argv,
			    envp,
			    flags,
			    child_setup,
			    child_handle,
			    stdin_fd,
			    stdout_fd,
			    stderr_fd,
			    NULL,
			    error);
}

1255
gboolean
1256 1257 1258 1259 1260
g_spawn_command_line_sync (const gchar  *command_line,
                           gchar       **standard_output,
                           gchar       **standard_error,
                           gint         *exit_status,
                           GError      **error)
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
{
  gboolean retval;
  gchar **argv = 0;

  g_return_val_if_fail (command_line != NULL, FALSE);
  
  if (!g_shell_parse_argv (command_line,
                           NULL, &argv,
                           error))
    return FALSE;
  
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  retval = g_spawn_sync (NULL,
                         argv,
                         NULL,
                         G_SPAWN_SEARCH_PATH,
                         NULL,
                         NULL,
                         standard_output,
                         standard_error,
                         exit_status,
                         error);
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  g_strfreev (argv);

  return retval;
}

gboolean
1288 1289
g_spawn_command_line_async (const gchar *command_line,
                            GError     **error)
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
{
  gboolean retval;
  gchar **argv = 0;

  g_return_val_if_fail (command_line != NULL, FALSE);

  if (!g_shell_parse_argv (command_line,
                           NULL, &argv,
                           error))
    return FALSE;
  
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  retval = g_spawn_async (NULL,
                          argv,
                          NULL,
                          G_SPAWN_SEARCH_PATH,
                          NULL,
                          NULL,
                          NULL,
                          error);
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  g_strfreev (argv);

  return retval;
}

void
g_spawn_close_pid (GPid pid)
{
    CloseHandle (pid);
}

1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
gboolean
g_spawn_check_exit_status (gint      exit_status,
			   GError  **error)
{
  gboolean ret = FALSE;

  if (exit_status != 0)
    {
      g_set_error (error, G_SPAWN_EXIT_ERROR, exit_status,
		   _("Child process exited with code %ld"),
		   (long) exit_status);
      goto out;
    }

  ret = TRUE;
 out:
  return ret;
}

1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
#ifdef G_OS_WIN32

/* Binary compatibility versions. Not for newly compiled code. */

_GLIB_EXTERN gboolean g_spawn_async_utf8              (const gchar           *working_directory,
                                                       gchar                **argv,
                                                       gchar                **envp,
                                                       GSpawnFlags            flags,
                                                       GSpawnChildSetupFunc   child_setup,
                                                       gpointer               user_data,
                                                       GPid                  *child_pid,
                                                       GError               **error);
_GLIB_EXTERN gboolean g_spawn_async_with_pipes_utf8   (const gchar           *working_directory,
                                                       gchar                **argv,
                                                       gchar                **envp,
                                                       GSpawnFlags            flags,
                                                       GSpawnChildSetupFunc   child_setup,
                                                       gpointer               user_data,
                                                       GPid                  *child_pid,
                                                       gint                  *standard_input,
                                                       gint                  *standard_output,
                                                       gint                  *standard_error,
                                                       GError               **error);
_GLIB_EXTERN gboolean g_spawn_sync_utf8               (const gchar           *working_directory,
                                                       gchar                **argv,
                                                       gchar                **envp,
                                                       GSpawnFlags            flags,
                                                       GSpawnChildSetupFunc   child_setup,
                                                       gpointer               user_data,
                                                       gchar                **standard_output,
                                                       gchar                **standard_error,
                                                       gint                  *exit_status,
                                                       GError               **error);
_GLIB_EXTERN gboolean g_spawn_command_line_sync_utf8  (const gchar           *command_line,
                                                       gchar                **standard_output,
                                                       gchar                **standard_error,
                                                       gint                  *exit_status,
                                                       GError               **error);
_GLIB_EXTERN gboolean g_spawn_command_line_async_utf8 (const gchar           *command_line,
                                                       GError               **error);
1379 1380

gboolean
1381 1382 1383 1384 1385 1386 1387 1388
g_spawn_async_utf8 (const gchar          *working_directory,
                    gchar               **argv,
                    gchar               **envp,
                    GSpawnFlags           flags,
                    GSpawnChildSetupFunc  child_setup,
                    gpointer              user_data,
                    GPid                 *child_handle,
                    GError              **error)
1389
{
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  return g_spawn_async (working_directory,
                        argv,
                        envp,
                        flags,
                        child_setup,
                        user_data,
                        child_handle,
                        error);
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}

gboolean
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
g_spawn_async_with_pipes_utf8 (const gchar          *working_directory,
                               gchar               **argv,
                               gchar               **envp,
                               GSpawnFlags           flags,
                               GSpawnChildSetupFunc  child_setup,
                               gpointer              user_data,
                               GPid                 *child_handle,
                               gint                 *standard_input,
                               gint                 *standard_output,
                               gint                 *standard_error,
                               GError              **error)
1412 1413
{
  return g_spawn_async_with_pipes (working_directory,
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                                   argv,
                                   envp,
                                   flags,
                                   child_setup,
                                   user_data,
                                   child_handle,
                                   standard_input,
                                   standard_output,
                                   standard_error,
                                   error);
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}

gboolean
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g_spawn_sync_utf8 (const gchar          *working_directory,
                   gchar               **argv,
                   gchar               **envp,
                   GSpawnFlags           flags,
                   GSpawnChildSetupFunc  child_setup,
                   gpointer              user_data,
                   gchar               **standard_output,
                   gchar               **standard_error,
                   gint                 *exit_status,
                   GError              **error)
1437
{
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
  return g_spawn_sync (working_directory,
                       argv,
                       envp,
                       flags,
                       child_setup,
                       user_data,
                       standard_output,
                       standard_error,
                       exit_status,
                       error);
1448 1449
}

1450
gboolean
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g_spawn_command_line_sync_utf8 (const gchar  *command_line,
                                gchar       **standard_output,
                                gchar       **standard_error,
                                gint         *exit_status,
                                GError      **error)
1456
{
1457 1458 1459 1460 1461
  return g_spawn_command_line_sync (command_line,
                                    standard_output,
                                    standard_error,
                                    exit_status,
                                    error);
1462 1463 1464
}

gboolean
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g_spawn_command_line_async_utf8 (const gchar *command_line,
                                 GError     **error)
1467
{
1468
  return g_spawn_command_line_async (command_line, error);
1469 1470
}

1471 1472 1473
#endif /* G_OS_WIN32 */

#endif /* !GSPAWN_HELPER */