I/O Vector is defined by including the file:
#include <sys/uio.h>
The functions readv and writev both use a concept of an I/O vector. The sys/uio.h include file defines the struct iovec, which is defined as follows:
struct iovec {
ptr_t iov_base; /* Starting address */
size_t iov_len; /* Length in bytes */
};
ptr_t iov_base; /* Starting address */
size_t iov_len; /* Length in bytes */
};
The
struct iovec defines one vector element. Normally, this structure is
used as an array of multiple elements. For each transfer element, the
pointer member iov_base points to a buffer that is receiving data for readv or is transmitting data for writev. The member iov_len in each case determines the maximum receive length and the actual write length, respectively.
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