+/* gspawn-win32-helper.c - Helper program for process launching on Win32.
+ *
+ * Copyright 2000 Red Hat, Inc.
+ * Copyright 2000 Tor Lillqvist
+ *
+ * GLib 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 version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * GLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GLib; see the file COPYING.LIB. If not, write
+ * to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#define GSPAWN_HELPER
+#include "gspawn-win32.c" /* For shared definitions */
+
+static void
+write_err_and_exit (gint fd,
+ gint msg)
+{
+ gint en = errno;
+
+ write (fd, &msg, sizeof(msg));
+ write (fd, &en, sizeof(en));
+
+ _exit (1);
+}
+
+static void
+write_no_error (gint fd)
+{
+ gint msg = CHILD_NO_ERROR;
+ gint en = 0;
+
+ write (fd, &msg, sizeof(msg));
+ write (fd, &en, sizeof(en));
+}
+
+#ifdef __GNUC__
+# ifndef _stdcall
+# define _stdcall __attribute__((stdcall))
+# endif
+#endif
+
+/* We build gspawn-win32-helper.exe as a Windows GUI application
+ * to avoid any temporarily flashing console windows in case
+ * the gspawn function is invoked by a GUI program. Thus, no main()
+ * but a WinMain(). We do, however, still use argc and argv tucked
+ * away in the global __argc and __argv by the C runtime startup code.
+ */
+
+int _stdcall
+WinMain (struct HINSTANCE__ *hInstance,
+ struct HINSTANCE__ *hPrevInstance,
+ char *lpszCmdLine,
+ int nCmdShow)
+{
+ int child_err_report_fd;
+ int i;
+ int fd;
+ int mode;
+ GString *debugstring;
+
+ SETUP_DEBUG();
+
+ if (debug)
+ {
+ debugstring = g_string_new ("");
+
+ g_string_append (debugstring,
+ g_strdup_printf ("g-spawn-win32-helper: "
+ "argc = %d, argv: ",
+ __argc));
+ for (i = 0; i < __argc; i++)
+ {
+ if (i > 0)
+ g_string_append (debugstring, " ");
+ g_string_append (debugstring, __argv[i]);
+ }
+
+ MessageBox (NULL, debugstring->str, "gspawn-win32-helper", 0);
+ }
+
+ g_assert (__argc >= ARG_COUNT);
+
+ /* argv[ARG_CHILD_ERR_REPORT] is the file descriptor onto which
+ * write error messages.
+ */
+ child_err_report_fd = atoi (__argv[ARG_CHILD_ERR_REPORT]);
+
+ /* argv[ARG_STDIN..ARG_STDERR] are the file descriptors that should
+ * be dup2'd to stdin, stdout and stderr, '-' if the corresponding
+ * std* should be let alone, and 'z' if it should be connected to
+ * the bit bucket NUL:.
+ */
+ if (__argv[ARG_STDIN][0] == '-')
+ ; /* Nothing */
+ else if (__argv[ARG_STDIN][0] == 'z')
+ {
+ fd = open ("NUL:", O_RDONLY);
+ if (fd != 0)
+ {
+ dup2 (fd, 0);
+ close (fd);
+ }
+ }
+ else
+ {
+ fd = atoi (__argv[ARG_STDIN]);
+ if (fd != 0)
+ {
+ dup2 (fd, 0);
+ close (fd);
+ }
+ }
+
+ if (__argv[ARG_STDOUT][0] == '-')
+ ; /* Nothing */
+ else if (__argv[ARG_STDOUT][0] == 'z')
+ {
+ fd = open ("NUL:", O_WRONLY);
+ if (fd != 1)
+ {
+ dup2 (fd, 1);
+ close (fd);
+ }
+ }
+ else
+ {
+ fd = atoi (__argv[ARG_STDOUT]);
+ if (fd != 1)
+ {
+ dup2 (fd, 1);
+ close (fd);
+ }
+ }
+
+ if (__argv[ARG_STDERR][0] == '-')
+ ; /* Nothing */
+ else if (__argv[ARG_STDERR][0] == 'z')
+ {
+ fd = open ("NUL:", O_WRONLY);
+ if (fd != 2)
+ {
+ dup2 (fd, 2);
+ close (fd);
+ }
+ }
+ else
+ {
+ fd = atoi (__argv[ARG_STDERR]);
+ if (fd != 2)
+ {
+ dup2 (fd, 2);
+ close (fd);
+ }
+ }
+
+ /* __argv[ARG_WORKING_DIRECTORY] is the directory in which to run the
+ * process. If "-", don't change directory.
+ */
+ if (__argv[ARG_WORKING_DIRECTORY][0] == '-' &&
+ __argv[ARG_WORKING_DIRECTORY][1] == 0)
+ ; /* Nothing */
+ else if (chdir (__argv[ARG_WORKING_DIRECTORY]) < 0)
+ write_err_and_exit (child_err_report_fd,
+ CHILD_CHDIR_FAILED);
+
+ /* __argv[ARG_CLOSE_DESCRIPTORS] is "y" if file descriptors from 3
+ * upwards should be closed
+ */
+
+ if (__argv[ARG_CLOSE_DESCRIPTORS][0] == 'y')
+ for (i = 3; i < 1000; i++) /* FIXME real limit? */
+ if (i != child_err_report_fd)
+ close (i);
+
+ /* __argv[ARG_WAIT] is "w" to wait for the program to exit */
+
+ if (__argv[ARG_WAIT][0] == 'w')
+ mode = P_WAIT;
+ else
+ mode = P_NOWAIT;
+
+ /* __argv[ARG_USE_PATH] is "y" to use PATH, otherwise not */
+
+ /* __argv[ARG_PROGRAM] is program file to run,
+ * __argv[ARG_PROGRAM+1]... is its __argv.
+ */
+
+ if (debug)
+ {
+ debugstring = g_string_new ("");
+ g_string_append (debugstring,
+ g_strdup_printf ("calling %s on program %s, __argv: ",
+ (__argv[ARG_USE_PATH][0] == 'y' ?
+ "spawnvp" : "spawnv"),
+ __argv[ARG_PROGRAM]));
+ i = ARG_PROGRAM+1;
+ while (__argv[i])
+ g_string_append (debugstring, __argv[i++]);
+ MessageBox (NULL, debugstring->str, "gspawn-win32-helper", 0);
+ }
+
+ if (__argv[ARG_USE_PATH][0] == 'y')
+ {
+ if (spawnvp (mode, __argv[ARG_PROGRAM], __argv+ARG_PROGRAM) < 0)
+ write_err_and_exit (child_err_report_fd, CHILD_SPAWN_FAILED);
+ }
+ else
+ {
+ if (spawnv (mode, __argv[ARG_PROGRAM], __argv+ARG_PROGRAM) < 0)
+ write_err_and_exit (child_err_report_fd, CHILD_SPAWN_FAILED);
+ }
+
+ return 0;
+}
+