/sys$common/syshlp/helplib.hlb
CRTL, readv, Arguments
 *Conan The Librarian 

 file_desc

    A file descriptor. A file descriptor that must refer to a file
    currently opened for reading.

 iov

    Array of iovec structures into which the input data is placed.

 iovcnt

    The number of buffers specified by the members of the iov array.
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