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/* gspawn-win32-helper.c - Helper program for process launching on Win32.
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* Copyright 2000 Red Hat, Inc.
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* Copyright 2000 Tor Lillqvist
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* GLib is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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* GLib is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with GLib; see the file COPYING.LIB. If not, write
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* to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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#include "gspawn-win32.c" /* For shared definitions */
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write_err_and_exit (gint fd,
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write (fd, &msg, sizeof(msg));
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write (fd, &en, sizeof(en));
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# define _stdcall __attribute__((stdcall))
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/* We build gspawn-win32-helper.exe as a Windows GUI application
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* to avoid any temporarily flashing console windows in case
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* the gspawn function is invoked by a GUI program. Thus, no main()
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* but a WinMain(). We do, however, still use argc and argv tucked
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* away in the global __argc and __argv by the C runtime startup code.
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/* Info peeked from mingw runtime's source code. __wgetmainargs() is a
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* function to get the program's argv in wide char format.
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extern void __wgetmainargs(int *argc,
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_startupinfo *startupinfo);
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/* Copy of protect_argv that handles wchar_t strings */
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protect_wargv (wchar_t **wargv,
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*new_wargv = g_new (wchar_t *, argc+1);
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/* Quote each argv element if necessary, so that it will get
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* reconstructed correctly in the C runtime startup code. Note that
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* the unquoting algorithm in the C runtime is really weird, and
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* rather different than what Unix shells do. See stdargv.c in the C
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* runtime sources (in the Platform SDK, in src/crt).
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* Note that an new_wargv[0] constructed by this function should
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* *not* be passed as the filename argument to a _wspawn* or _wexec*
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* family function. That argument should be the real file name
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* without any quoting.
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for (i = 0; i < argc; i++)
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wchar_t *p = wargv[i];
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gboolean need_dblquotes = FALSE;
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if (*p == ' ' || *p == '\t')
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need_dblquotes = TRUE;
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while (*pp && *pp == '\\')
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q = (*new_wargv)[i] = g_new (wchar_t, len + need_dblquotes*2 + 1);
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while (*pp && *pp == '\\')
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(*new_wargv)[argc] = NULL;
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WinMain (struct HINSTANCE__ *hInstance,
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struct HINSTANCE__ *hPrevInstance,
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int child_err_report_fd;
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int no_error = CHILD_NO_ERROR;
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gint argv_zero_offset = ARG_PROGRAM;
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wchar_t **wargv, **wenvp;
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_startupinfo si = { 0 };
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g_assert (__argc >= ARG_COUNT);
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if (G_WIN32_HAVE_WIDECHAR_API ())
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/* Fetch the wide-char argument vector */
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__wgetmainargs (&argc, &wargv, &wenvp, 0, &si);
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/* We still have the system codepage args in __argv. We can look
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* at the first args in which gspawn-win32.c passes us flags and
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* fd numbers in __argv, as we know those are just ASCII anyway.
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g_assert (argc == __argc);
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/* argv[ARG_CHILD_ERR_REPORT] is the file descriptor number onto
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* which write error messages.
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child_err_report_fd = atoi (__argv[ARG_CHILD_ERR_REPORT]);
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/* Hack to implement G_SPAWN_FILE_AND_ARGV_ZERO. If
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* argv[ARG_CHILD_ERR_REPORT] is suffixed with a '#' it means we get
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* the program to run and its argv[0] separately.
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if (__argv[ARG_CHILD_ERR_REPORT][strlen (__argv[ARG_CHILD_ERR_REPORT]) - 1] == '#')
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/* argv[ARG_STDIN..ARG_STDERR] are the file descriptor numbers that
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* should be dup2'd to 0, 1 and 2. '-' if the corresponding fd
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* should be left alone, and 'z' if it should be connected to the
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if (__argv[ARG_STDIN][0] == '-')
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else if (__argv[ARG_STDIN][0] == 'z')
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fd = open ("NUL:", O_RDONLY);
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fd = atoi (__argv[ARG_STDIN]);
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if (__argv[ARG_STDOUT][0] == '-')
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else if (__argv[ARG_STDOUT][0] == 'z')
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fd = open ("NUL:", O_WRONLY);
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fd = atoi (__argv[ARG_STDOUT]);
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if (__argv[ARG_STDERR][0] == '-')
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else if (__argv[ARG_STDERR][0] == 'z')
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fd = open ("NUL:", O_WRONLY);
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fd = atoi (__argv[ARG_STDERR]);
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/* __argv[ARG_WORKING_DIRECTORY] is the directory in which to run the
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* process. If "-", don't change directory.
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if (__argv[ARG_WORKING_DIRECTORY][0] == '-' &&
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__argv[ARG_WORKING_DIRECTORY][1] == 0)
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else if ((G_WIN32_HAVE_WIDECHAR_API () &&
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_wchdir (wargv[ARG_WORKING_DIRECTORY]) < 0) ||
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(!G_WIN32_HAVE_WIDECHAR_API () &&
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chdir (__argv[ARG_WORKING_DIRECTORY]) < 0))
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write_err_and_exit (child_err_report_fd, CHILD_CHDIR_FAILED);
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/* __argv[ARG_CLOSE_DESCRIPTORS] is "y" if file descriptors from 3
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* upwards should be closed
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if (__argv[ARG_CLOSE_DESCRIPTORS][0] == 'y')
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for (i = 3; i < 1000; i++) /* FIXME real limit? */
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if (i != child_err_report_fd)
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/* __argv[ARG_WAIT] is "w" to wait for the program to exit */
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if (__argv[ARG_WAIT][0] == 'w')
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/* __argv[ARG_USE_PATH] is "y" to use PATH, otherwise not */
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/* __argv[ARG_PROGRAM] is executable file to run,
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* __argv[argv_zero_offset]... is its argv. argv_zero_offset equals
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* ARG_PROGRAM unless G_SPAWN_FILE_AND_ARGV_ZERO was used, in which
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* case we have a separate executable name and argv[0].
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/* For the program name passed to spawnv(), don't use the quoted
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if (G_WIN32_HAVE_WIDECHAR_API ())
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protect_wargv (wargv + argv_zero_offset, &new_wargv);
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if (__argv[ARG_USE_PATH][0] == 'y')
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handle = _wspawnvp (mode, wargv[ARG_PROGRAM], (const wchar_t **) new_wargv);
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handle = _wspawnv (mode, wargv[ARG_PROGRAM], (const wchar_t **) new_wargv);
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protect_argv (__argv + argv_zero_offset, &new_argv);
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if (__argv[ARG_USE_PATH][0] == 'y')
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handle = spawnvp (mode, __argv[ARG_PROGRAM], (const char **) new_argv);
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handle = spawnv (mode, __argv[ARG_PROGRAM], (const char **) new_argv);
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if (handle == -1 && saved_errno != 0)
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write_err_and_exit (child_err_report_fd, CHILD_SPAWN_FAILED);
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write (child_err_report_fd, &no_error, sizeof (no_error));
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if (mode == P_NOWAIT)
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write (child_err_report_fd, &handle, sizeof (handle));
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write (child_err_report_fd, &zero, sizeof (zero));