The nng_aio_set_iov() function sets a scatter/gather vector iov on the handle aio.
The iov is a pointer to an array of niov nng_iov
structures, which have the following definition:
typedef struct nng_iov {
void * iov_buf;
size_t iov_len;
};The iov is copied into storage in the aio itself, so that callers may use stack allocated nng_iov structures.
The values pointed to by the iov_buf members are not copied by this function though.
A maximum of eight (8) nng_iov members may be supplied.
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Note
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Earlier versions of the library could accept longer scatter-gather lists. However, no known consumers have ever needed a scatter-gather list longer than 4 vectors. As a result, the implementation limit was reduced, and heap allocations which could fail were removed. |