NAME¶

io_uring_recvmsg_out - access data from multishot recvmsg

SYNOPSIS¶

#include <liburing.h>

struct io_uring_recvmsg_out *io_uring_recvmsg_validate(void *buf,
                                                       int buf_len,
                                                       struct msghdr *msgh);

void *io_uring_recvmsg_name(struct io_uring_recvmsg_out *o);

struct cmsghdr *io_uring_recvmsg_cmsg_firsthdr(struct io_uring_recvmsg_out *o,
                                               struct msghdr *msgh);
struct cmsghdr *io_uring_recvmsg_cmsg_nexthdr(struct io_uring_recvmsg_out *o,
                                              struct msghdr *msgh,
                                              struct cmsghdr *cmsg);

void *io_uring_recvmsg_payload(struct io_uring_recvmsg_out *o,
                               struct msghdr *msgh);
unsigned int io_uring_recvmsg_payload_length(struct io_uring_recvmsg_out *o,
                                             int buf_len,
                                             struct msghdr *msgh);

DESCRIPTION¶

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.
      

SEE ALSO¶

io_uring_prep_recvmsg_multishot(3)