call_usermodehelper()函数

static int umh_test( void )
{
  char *argv[] = { "/usr/bin/logger", "help!", NULL };
  static char *[] = {
        "HOME=/",
        "TERM=linux",
        "PATH=/sbin:/bin:/usr/sbin:/usr/bin", NULL };

  return call_usermodehelper( argv[0], argv, envp, UMH_WAIT_PROC );
}