sock_send_to()

Send a message on a socket to a specific address.

Description

The sock_send_to() function is used to send a message on a socket to a specific address. It is similar to the sendto function in POSIX, but it also supports writing the data from multiple buffers in the manner of writev.

The function sends a message using the provided scatter/gather vectors to the specified address. The number of bytes transmitted is returned.

Syntax

  ;;; the data from multiple buffers in the manner of `writev`.
  ;;; Note: This is similar to `sendto` in POSIX, though it also supports writing
  ;;; Send a message on a socket to a specific address.
  (@interface func (export "sock_send_to")
    (param $fd $fd)
    ;;; List of scatter/gather vectors to which to retrieve data
    (param $si_data $ciovec_array)
    ;;; Message flags.
    (param $si_flags $siflags)
    ;;; Address of the socket to send message to
    (param $addr (@witx const_pointer $addr_port))
    ;;; Number of bytes transmitted.
    (result $error (expected $size (error $errno)))
  )

Parameters

• ctx: A mutable reference to the function environment.
• sock: The file descriptor of the socket to send on.
• si_data: A list of scatter/gather vectors containing the data to be sent.
• si_data_len: The length of the scatter/gather vector list.
• _si_flags: Message flags.
• addr: The address of the socket to send the message to.
• ret_data_len: A pointer to store the number of bytes transmitted.

Return Value

The function returns a Result containing an Errno value. If the operation is successful, Errno::Success is returned. Otherwise, an appropriate Errno value indicating the error is returned.

Notes

• The sock_send_to() function sends a message on a socket to a specific address using the provided scatter/gather vectors.
• The function supports writing the data from multiple buffers.
• The si_data parameter represents a list of scatter/gather vectors, where each vector contains a buffer and its length.
• The si_data_len parameter specifies the length of the scatter/gather vector list.
• The data to be sent is retrieved from the buffers specified by the scatter/gather vectors.
• The addr parameter specifies the address of the socket to send the message to.
• The specific behavior of the sock_send_to() function may vary depending on the runtime environment and underlying networking implementation.