NAME

       io_uring_prep_cmd_sock - prepare a command request for a socket

SYNOPSIS

       #include <liburing.h>

       void io_uring_prep_cmd_sock(struct io_uring_sqe *sqe,
                                   int cmd_op,
                                   int fd,
                                   int level,
                                   int optname,
                                   void *optval,
                                   int optlen);

DESCRIPTION

       The  io_uring_prep_cmd_sock(3)  function prepares an cmd request for a socket. The submission queue entry
       sqe is setup to use the socket file descriptor pointed to by fd to start an command operation defined  by
       cmd_op.

       This is a generic function, and each command has their own individual level, optname, optval values.  The
       optlen defines the size pointed by optval.

Available commands

       SOCKET_URING_OP_SIOCINQ
              Returns the amount of queued unread data in the receive buffer.  The socket must not be in  LISTEN
              state,  otherwise  an error -EINVAL is returned in the CQE res field.  The following arguments are
              not used for this command level, optname, optval and optlen.

              Negative return value means an error.

              For more information about this command, please check unix(7).

       SIOCOUTQ
              Returns the amount of unsent data in the socket send queue.  The socket  must  not  be  in  LISTEN
              state, otherwise an error -EINVAL is returned in the CQE res.  field.  The following arguments are
              not used for this command level, optname, optval and optlen.

              Negative return value means an error.

              For more information about this command, please check unix(7).

NOTES

       The memory block pointed by optval needs to be valid/live until the CQE returns.

RETURN VALUE

       Dependent on the command.

ERRORS

       The CQE res field will contain the result of the operation.

SEE ALSO

       io_uring_get_sqe(3), io_uring_submit(3), io_uring_register(2), unix(7)