Function nix::sys::sendfile::sendfile

pub fn sendfile(
    in_fd: RawFd, 
    out_sock: RawFd, 
    offset: off_t, 
    count: Option<off_t>, 
    headers: Option<&[&[u8]]>, 
    trailers: Option<&[&[u8]]>
) -> (Result<()>, off_t)

Read bytes from in_fd starting at offset and write up to count bytes to out_sock.

Returns a Result and a count of bytes written. Bytes written may be non-zero even if an error occurs.

in_fd must describe a regular file. out_sock must describe a stream socket.

If offset falls past the end of the file, the function returns success and zero bytes written.

If count is None or 0, bytes will be read from in_fd until reaching the end of file (EOF).

hdtr specifies an optional list of headers and trailers to be sent before and after the data read from in_fd, respectively. The length of headers and trailers sent is included in the returned count of bytes written. If any headers are specified and count is non-zero, the length of the headers will be counted in the limit of total bytes sent. Trailers do not count toward the limit of bytes sent and will always be sent regardless. The value of offset does not affect headers or trailers.

For more information, see the sendfile(2) man page.