# Pastebin 2wnFtCOV
 * @qemu_chr_fe_write_all:
 *
 * Write data to a character backend from the front end.  This function will
 * send data from the front end to the back end.  Unlike @qemu_chr_fe_write,
 * this function will block if the back end cannot consume all of the data
 * attempted to be written.  This function is thread-safe.