axboe-liburing 2.15.2

Low-level io_uring interface, transliterated from Jens Axboe's liburing.
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Access data from multishot recvmsg

# DESCRIPTION

These functions are used to access data in the payload delivered by
[io_uring_prep_recvmsg_multishot].

*msgh* should point to the *struct msghdr* submitted with the request.

[io_uring_recvmsg_validate] will validate a buffer delivered by
[io_uring_prep_recvmsg_multishot] and extract the
*io_uring_recvmsg_out* if it is valid, returning a pointer to it or else
NULL.

The structure is defined as follows:

``` c

struct io_uring_recvmsg_out {
        __u32 namelen;    /* Name byte count as would have been populated
                           * by recvmsg(2) */
        __u32 controllen; /* Control byte count */
        __u32 payloadlen; /* Payload byte count as would have been returned
                           * by recvmsg(2) */
        __u32 flags;      /* Flags result as would have been populated
                           * by recvmsg(2) */
};

io_uring_recvmsg_name(3)
returns a pointer to the name in the buffer.
io_uring_recvmsg_cmsg_firsthdr(3)
returns a pointer to the first cmsg in the buffer, or NULL.
io_uring_recvmsg_cmsg_nexthdr(3)
returns a pointer to the next cmsg in the buffer, or NULL.
io_uring_recvmsg_payload(3)
returns a pointer to the payload in the buffer.
io_uring_recvmsg_payload_length(3)
Calculates the usable payload length in bytes.

```

# SEE ALSO

[io_uring_prep_recvmsg_multishot]