diff options
| -rw-r--r-- | hw/serial.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/hw/serial.c b/hw/serial.c index c409659562..3cf43f4d16 100644 --- a/hw/serial.c +++ b/hw/serial.c @@ -123,10 +123,12 @@ static void serial_ioport_write(void *opaque, uint32_t addr, uint32_t val) s->lsr &= ~UART_LSR_THRE; serial_update_irq(s); - ch = val; - do { - ret = write(s->out_fd, &ch, 1); - } while (ret != 1); + if (s->out_fd >= 0) { + ch = val; + do { + ret = write(s->out_fd, &ch, 1); + } while (ret != 1); + } s->thr_ipending = 1; s->lsr |= UART_LSR_THRE; s->lsr |= UART_LSR_TEMT; @@ -267,7 +269,10 @@ SerialState *serial_init(int base, int irq, int fd) register_ioport_write(base, 8, 1, serial_ioport_write, s); register_ioport_read(base, 8, 1, serial_ioport_read, s); - if (fd != 0) { + if (fd < 0) { + /* no associated device */ + s->out_fd = -1; + } else if (fd != 0) { qemu_add_fd_read_handler(fd, serial_can_receive1, serial_receive1, s); s->out_fd = fd; } else { |