/* Write buffered data to program stdin. */
if (fdin != -1 && FD_ISSET(fdin, writeset)) {
len = write(fdin, buffer_ptr(&stdin_buffer),
/* Write buffered data to program stdin. */
if (fdin != -1 && FD_ISSET(fdin, writeset)) {
len = write(fdin, buffer_ptr(&stdin_buffer),