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c4161c8784
At devicemodel/hw/uart_core.c, struct ttyfd has only one file descriptor for uart backend device, that is OK if DM uart open a tty characteor device under /dev/ for reading, writing and terminal operating. When use stdio as backend tty device, there are 2 fds, stdin/stdout. DM should read from 'stdin' and output to 'stdout'. But ttyfd just has one fd, and is only for 'stdin', so dm has to output to stdin, too, not to stdout. That cause a problem: if use stdio for uart backend, you can't redirect UOS console to any other files. Because stdout is not used. We hope to store information from VM console to system journal, when UOS is launched by Acrnd automatically. The systemd need to redirect stdout of dm to system journal files, but it can't be done. So we can split the 'fd' of struct ttyfd to 'fd_in' & 'fd_out'. they are same when use tty device; And they are different when use stdio, 'fd_in' is for stdin and 'fd_out' is for stdout. Tracked-On: #1759 Acked-by: Yin Fengwei <fengwei.yin@intel.com> Reviewed-by: Like Yan <like.yan@intel.com> Signed-off-by: Tao Yuhong <yuhong.tao@intel.com> |
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| .. | ||
| pci | ||
| platform | ||
| block_if.c | ||
| uart_core.c | ||
| usb_core.c | ||