Revision b6855851 vl.c

b/vl.c
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    int fd;
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    TFR(fd = open(filename, O_RDWR | O_NONBLOCK));
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    fcntl(fd, F_SETFL, O_NONBLOCK);
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    tty_serial_init(fd, 115200, 'N', 8, 1);
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    chr = qemu_chr_open_fd(fd, fd);
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    if (!chr) {

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