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8edcf67b02
Harmonize a little the license headers. In most of the license headers in GLib, it is "This library". It is also what is explained at: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html#SEC4 "How to Apply These Terms to Your New Libraries" https://bugzilla.gnome.org/show_bug.cgi?id=776586
367 lines
9.7 KiB
C
367 lines
9.7 KiB
C
/* gspawn-win32-helper.c - Helper program for process launching on Win32.
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*
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* Copyright 2000 Red Hat, Inc.
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* Copyright 2000 Tor Lillqvist
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 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
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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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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <fcntl.h>
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/* For _CrtSetReportMode, we don't want Windows CRT (2005 and later)
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* to terminate the process if a bad file descriptor is passed into
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* _get_osfhandle(). This is necessary because we use _get_osfhandle()
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* to check the validity of the fd before we try to call close() on
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* it as attempting to close an invalid fd will cause the Windows CRT
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* to abort() this program internally.
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*
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* Please see http://msdn.microsoft.com/zh-tw/library/ks2530z6%28v=vs.80%29.aspx
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* for an explanation on this.
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*/
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#if (defined (_MSC_VER) && _MSC_VER >= 1400)
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#include <crtdbg.h>
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#endif
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#undef G_LOG_DOMAIN
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#include "glib.h"
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#define GSPAWN_HELPER
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#include "gspawn-win32.c" /* For shared definitions */
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static void
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write_err_and_exit (gint fd,
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gintptr msg)
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{
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gintptr en = errno;
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write (fd, &msg, sizeof(gintptr));
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write (fd, &en, sizeof(gintptr));
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_exit (1);
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}
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#ifdef __GNUC__
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# ifndef _stdcall
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# define _stdcall __attribute__((stdcall))
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# endif
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#endif
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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().
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*/
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/* Copy of protect_argv that handles wchar_t strings */
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static gint
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protect_wargv (gint argc,
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wchar_t **wargv,
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wchar_t ***new_wargv)
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{
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gint i;
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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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*
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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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*/
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for (i = 0; i < argc; i++)
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{
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wchar_t *p = wargv[i];
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wchar_t *q;
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gint len = 0;
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gboolean need_dblquotes = FALSE;
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while (*p)
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{
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if (*p == ' ' || *p == '\t')
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need_dblquotes = TRUE;
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else if (*p == '"')
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len++;
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else if (*p == '\\')
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{
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wchar_t *pp = p;
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while (*pp && *pp == '\\')
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pp++;
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if (*pp == '"')
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len++;
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}
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len++;
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p++;
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}
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q = (*new_wargv)[i] = g_new (wchar_t, len + need_dblquotes*2 + 1);
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p = wargv[i];
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if (need_dblquotes)
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*q++ = '"';
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while (*p)
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{
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if (*p == '"')
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*q++ = '\\';
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else if (*p == '\\')
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{
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wchar_t *pp = p;
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while (*pp && *pp == '\\')
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pp++;
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if (*pp == '"')
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*q++ = '\\';
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}
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*q++ = *p;
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p++;
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}
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if (need_dblquotes)
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*q++ = '"';
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*q++ = '\0';
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}
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(*new_wargv)[argc] = NULL;
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return argc;
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}
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#if (defined (_MSC_VER) && _MSC_VER >= 1400)
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/*
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* This is the (empty) invalid parameter handler
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* that is used for Visual C++ 2005 (and later) builds
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* so that we can use this instead of the system automatically
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* aborting the process.
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*
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* This is necessary as we use _get_oshandle() to check the validity
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* of the file descriptors as we close them, so when an invalid file
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* descriptor is passed into that function as we check on it, we get
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* -1 as the result, instead of the gspawn helper program aborting.
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*
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* Please see http://msdn.microsoft.com/zh-tw/library/ks2530z6%28v=vs.80%29.aspx
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* for an explanation on this.
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*/
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extern void
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myInvalidParameterHandler(const wchar_t *expression,
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const wchar_t *function,
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const wchar_t *file,
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unsigned int line,
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uintptr_t pReserved);
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#endif
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#ifndef HELPER_CONSOLE
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int _stdcall
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WinMain (struct HINSTANCE__ *hInstance,
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struct HINSTANCE__ *hPrevInstance,
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char *lpszCmdLine,
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int nCmdShow)
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#else
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int
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main (int ignored_argc, char **ignored_argv)
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#endif
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{
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int child_err_report_fd = -1;
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int helper_sync_fd = -1;
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int i;
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int fd;
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int mode;
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gintptr handle;
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int saved_errno;
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gintptr no_error = CHILD_NO_ERROR;
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gint argv_zero_offset = ARG_PROGRAM;
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wchar_t **new_wargv;
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int argc;
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char **argv;
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wchar_t **wargv;
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char c;
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#if (defined (_MSC_VER) && _MSC_VER >= 1400)
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/* set up our empty invalid parameter handler */
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_invalid_parameter_handler oldHandler, newHandler;
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newHandler = myInvalidParameterHandler;
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oldHandler = _set_invalid_parameter_handler(newHandler);
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/* Disable the message box for assertions. */
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_CrtSetReportMode(_CRT_ASSERT, 0);
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#endif
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/* Fetch the wide-char argument vector */
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wargv = CommandLineToArgvW (GetCommandLineW(), &argc);
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g_assert (argc >= ARG_COUNT);
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/* Convert unicode wargs to utf8 */
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argv = g_new(char *, argc + 1);
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for (i = 0; i < argc; i++)
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argv[i] = g_utf16_to_utf8(wargv[i], -1, NULL, NULL, NULL);
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argv[i] = NULL;
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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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*/
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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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*/
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if (argv[ARG_CHILD_ERR_REPORT][strlen (argv[ARG_CHILD_ERR_REPORT]) - 1] == '#')
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argv_zero_offset++;
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/* argv[ARG_HELPER_SYNC] is the file descriptor number we read a
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* byte that tells us it is OK to exit. We have to wait until the
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* parent allows us to exit, so that the parent has had time to
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* duplicate the process handle we sent it. Duplicating a handle
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* from another process works only if that other process exists.
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*/
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helper_sync_fd = atoi (argv[ARG_HELPER_SYNC]);
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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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* bit bucket NUL:.
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*/
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if (argv[ARG_STDIN][0] == '-')
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; /* Nothing */
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else if (argv[ARG_STDIN][0] == 'z')
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{
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fd = open ("NUL:", O_RDONLY);
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if (fd != 0)
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{
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dup2 (fd, 0);
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close (fd);
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}
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}
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else
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{
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fd = atoi (argv[ARG_STDIN]);
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if (fd != 0)
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{
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dup2 (fd, 0);
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close (fd);
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}
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}
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if (argv[ARG_STDOUT][0] == '-')
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; /* Nothing */
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else if (argv[ARG_STDOUT][0] == 'z')
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{
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fd = open ("NUL:", O_WRONLY);
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if (fd != 1)
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{
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dup2 (fd, 1);
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close (fd);
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}
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}
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else
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{
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fd = atoi (argv[ARG_STDOUT]);
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if (fd != 1)
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{
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dup2 (fd, 1);
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close (fd);
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}
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}
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if (argv[ARG_STDERR][0] == '-')
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; /* Nothing */
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else if (argv[ARG_STDERR][0] == 'z')
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{
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fd = open ("NUL:", O_WRONLY);
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if (fd != 2)
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{
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dup2 (fd, 2);
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close (fd);
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}
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}
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else
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{
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fd = atoi (argv[ARG_STDERR]);
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if (fd != 2)
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{
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dup2 (fd, 2);
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close (fd);
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}
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}
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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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*/
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if (argv[ARG_WORKING_DIRECTORY][0] == '-' &&
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argv[ARG_WORKING_DIRECTORY][1] == 0)
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; /* Nothing */
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else if (_wchdir (wargv[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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*/
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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 && i != helper_sync_fd)
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if (_get_osfhandle (i) != -1)
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close (i);
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/* We don't want our child to inherit the error report and
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* helper sync fds.
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*/
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child_err_report_fd = dup_noninherited (child_err_report_fd, _O_WRONLY);
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helper_sync_fd = dup_noninherited (helper_sync_fd, _O_RDONLY);
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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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mode = P_WAIT;
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else
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mode = P_NOWAIT;
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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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*/
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/* For the program name passed to spawnv(), don't use the quoted
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* version.
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*/
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protect_wargv (argc - argv_zero_offset, 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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else
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handle = _wspawnv (mode, wargv[ARG_PROGRAM], (const wchar_t **) new_wargv);
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saved_errno = errno;
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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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write (child_err_report_fd, &handle, sizeof (handle));
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read (helper_sync_fd, &c, 1);
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LocalFree (wargv);
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g_strfreev (argv);
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return 0;
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}
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