io_uring_recvmsg_out

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_recv_multishot(3)

io_uring_recvmsg_validate(3) will validate a buffer delivered by io_uring_prep_recv_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_recv_multishot(3)