sock_send_file()
Sends the entire contents of a file down a socket.
Description
The sock_send_file()
function is used to send the entire contents of a file down a socket. It reads the data from the file and transmits it over the socket. The function returns the number of bytes transmitted.
Syntax
;;; Sends the entire contents of a file down a socket
(@interface func (export "sock_send_file")
(param $out_fd $fd)
;;; Open file that has the data to be transmitted
(param $in_fd $fd)
;;; Offset into the file to start reading at
(param $offset $filesize)
;;; Number of bytes to be sent
(param $count $filesize)
;;; Number of bytes transmitted.
(result $error (expected $filesize (error $errno)))
)
Parameters
ctx
: A mutable reference to the function environment.sock
: The file descriptor of the socket to send on.in_fd
: The file descriptor of the open file that has the data to be transmitted.offset
: The offset into the file to start reading at.count
: The number of bytes to be sent.ret_sent
: 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_file()
function sends the entire contents of a file down a socket. - It starts reading from the specified offset within the file.
- The
count
parameter specifies the number of bytes to be sent. It is decremented as data is transmitted. - The function enters a loop to process the data in chunks. Each chunk is read from the file and sent over the socket.
- The function supports reading data from different types of files, including regular files, standard input, and pipes.
- The specific behavior of the
sock_send_file()
function may vary depending on the runtime environment and underlying networking implementation.