static CharDriverState *qmp_chardev_open_serial(const char *id, ChardevBackend *backend, ChardevReturn *ret, Error **errp) { ChardevHostdev *serial = backend->serial; int fd; fd = qmp_chardev_open_file_source(serial->device, O_RDWR, errp); if (fd < 0) { return NULL; } qemu_set_nonblock(fd); return qemu_chr_open_tty_fd(fd); }