+/**
+ * Closes all file descriptors except the first three (i.e. stdin,
+ * stdout, stderr).
+ */
+void
+_dbus_close_all (void)
+{
+ int maxfds, i;
+
+#ifdef __linux__
+ DIR *d;
+
+ /* On Linux we can optimize this a bit if /proc is available. If it
+ isn't available, fall back to the brute force way. */
+
+ d = opendir ("/proc/self/fd");
+ if (d)
+ {
+ for (;;)
+ {
+ struct dirent buf, *de;
+ int k, fd;
+ long l;
+ char *e = NULL;
+
+ k = readdir_r (d, &buf, &de);
+ if (k != 0 || !de)
+ break;
+
+ if (de->d_name[0] == '.')
+ continue;
+
+ errno = 0;
+ l = strtol (de->d_name, &e, 10);
+ if (errno != 0 || e == NULL || *e != '\0')
+ continue;
+
+ fd = (int) l;
+ if (fd < 3)
+ continue;
+
+ if (fd == dirfd (d))
+ continue;
+
+ close (fd);
+ }
+
+ closedir (d);
+ return;
+ }
+#endif
+
+ maxfds = sysconf (_SC_OPEN_MAX);
+
+ /* Pick something reasonable if for some reason sysconf says
+ * unlimited.
+ */
+ if (maxfds < 0)
+ maxfds = 1024;
+
+ /* close all inherited fds */
+ for (i = 3; i < maxfds; i++)
+ close (i);
+}
+