Iovec
WASI Preview1 type $iovec
A region of memory for scatter/gather reads.
Parameters
buf
The address of the buffer to be filled.
bufLen 
The length of the buffer to be filled.
Definition:
(typename $iovec
  (record
    ;;; The address of the buffer to be filled.
    (field $buf (@witx pointer u8))
    ;;; The length of the buffer to be filled.
    (field $buf_len $size)
  )
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