<p></p>
<p>Hi shaping.  That’s a misreading. The first argument is the number of file descriptors in the various fds arguments:</p>
<p>The nfds argument specifies the range of descriptors to be tested. The first nfds descriptors shall be checked in each set; that is, the descriptors from zero through nfds-1 in the descriptor sets shall be examined.</p>

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