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Pointer to a set of socket file descriptors to:
- Check for available read operations.
- Returns the actual socket file descriptors ready for available read operations, if no errors;
- Returns the initial, non-modified set of socket file descriptors, on any errors;
- Returns a null-valued (i.e., zero-cleared) descriptor set, if any timeout expires.
psock_desc_wr
Pointer to a set of socket file descriptors to:
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