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FD_SET (sock, &select_inset);
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rc = select(sock + 1, (SELECT_ARG2_TYPE *)&select_inset, NULL, NULL, &tv);
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/* If some interrupt arrived, just retry. We presume this to be rare,
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but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes
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if (rc < 0 && errno == EINTR)