NNG_IOV(5) NNG Reference Manual NNG_IOV(5)

nng_iov - scatter/gather element

#include <nng/nng.h>
typedef struct {
    void * iov_buf;
    size_t iov_len;
} nng_iov;

An nng_iov structure represents a single element in a scatter/gather array. Some operations can use arrays of these to access different regions of memory in a single operation. For example, it may be useful to send a message with header data from one part of memory, and a user payload from another.

The operations that do this typically store an array of these in an nng_aio structure using the nng_aio_set_iov() function.

The following structure members are present:

iov_buf

This is a pointer to the first byte within the memory being referenced by this scatter/gather element.

iov_len

This is the size in bytes of this scatter/gather element.

nng_aio_set_iov(3), nng_aio(5), nng(7)

2025-01-05