io_uring_recvmsg_validate3

Usage

#include <liburing.h>

Overview

These functions are used to access data in the payload delivered by io_uring_prep_recvmsg_multishot(3).

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

io_uring_recvmsg_validate(3) will validate a buffer delivered by io_uring_prep_recvmsg_multishot(3) 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:

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.