small fixes:
fix xstrdup to not grossly overallocate memory use xopen instean of xopen3 in several places etc.
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@ -263,7 +263,7 @@ int rx_main(int argc, char **argv)
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fn = argv[1];
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ttyfd = xopen(CURRENT_TTY, O_RDWR);
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filefd = xopen3(fn, O_RDWR|O_CREAT|O_TRUNC, 0666);
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filefd = xopen(fn, O_RDWR|O_CREAT|O_TRUNC);
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if (tcgetattr(ttyfd, &tty) < 0)
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bb_perror_msg_and_die("tcgetattr");
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