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use std::os::unix::io::RawFd;
use std::ptr;
use libc::{self, off_t};
use Result;
use errno::Errno;
#[cfg(any(target_os = "android", target_os = "linux"))]
pub fn sendfile(
out_fd: RawFd,
in_fd: RawFd,
offset: Option<&mut off_t>,
count: usize,
) -> Result<usize> {
let offset = offset
.map(|offset| offset as *mut _)
.unwrap_or(ptr::null_mut());
let ret = unsafe { libc::sendfile(out_fd, in_fd, offset, count) };
Errno::result(ret).map(|r| r as usize)
}
cfg_if! {
if #[cfg(any(target_os = "freebsd",
target_os = "ios",
target_os = "macos"))] {
use sys::uio::IoVec;
#[allow(missing_debug_implementations)]
struct SendfileHeaderTrailer<'a>(
libc::sf_hdtr,
Option<Vec<IoVec<&'a [u8]>>>,
Option<Vec<IoVec<&'a [u8]>>>,
);
impl<'a> SendfileHeaderTrailer<'a> {
fn new(
headers: Option<&'a [&'a [u8]]>,
trailers: Option<&'a [&'a [u8]]>
) -> SendfileHeaderTrailer<'a> {
let header_iovecs: Option<Vec<IoVec<&[u8]>>> =
headers.map(|s| s.iter().map(|b| IoVec::from_slice(b)).collect());
let trailer_iovecs: Option<Vec<IoVec<&[u8]>>> =
trailers.map(|s| s.iter().map(|b| IoVec::from_slice(b)).collect());
SendfileHeaderTrailer(
libc::sf_hdtr {
headers: {
header_iovecs
.as_ref()
.map_or(ptr::null(), |v| v.as_ptr()) as *mut libc::iovec
},
hdr_cnt: header_iovecs.as_ref().map(|v| v.len()).unwrap_or(0) as i32,
trailers: {
trailer_iovecs
.as_ref()
.map_or(ptr::null(), |v| v.as_ptr()) as *mut libc::iovec
},
trl_cnt: trailer_iovecs.as_ref().map(|v| v.len()).unwrap_or(0) as i32
},
header_iovecs,
trailer_iovecs,
)
}
}
}
}
cfg_if! {
if #[cfg(target_os = "freebsd")] {
use libc::c_int;
libc_bitflags!{
pub struct SfFlags: c_int {
SF_NODISKIO;
SF_SYNC;
SF_USER_READAHEAD;
SF_NOCACHE;
}
}
pub fn sendfile(
in_fd: RawFd,
out_sock: RawFd,
offset: off_t,
count: Option<usize>,
headers: Option<&[&[u8]]>,
trailers: Option<&[&[u8]]>,
flags: SfFlags,
readahead: u16
) -> (Result<()>, off_t) {
let flags: u32 = ((readahead as u32) << 16) | (flags.bits() as u32);
let mut bytes_sent: off_t = 0;
let hdtr = headers.or(trailers).map(|_| SendfileHeaderTrailer::new(headers, trailers));
let hdtr_ptr = hdtr.as_ref().map_or(ptr::null(), |s| &s.0 as *const libc::sf_hdtr);
let return_code = unsafe {
libc::sendfile(in_fd,
out_sock,
offset,
count.unwrap_or(0),
hdtr_ptr as *mut libc::sf_hdtr,
&mut bytes_sent as *mut off_t,
flags as c_int)
};
(Errno::result(return_code).and(Ok(())), bytes_sent)
}
} else if #[cfg(any(target_os = "ios", target_os = "macos"))] {
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) {
let mut len = count.unwrap_or(0);
let hdtr = headers.or(trailers).map(|_| SendfileHeaderTrailer::new(headers, trailers));
let hdtr_ptr = hdtr.as_ref().map_or(ptr::null(), |s| &s.0 as *const libc::sf_hdtr);
let return_code = unsafe {
libc::sendfile(in_fd,
out_sock,
offset,
&mut len as *mut off_t,
hdtr_ptr as *mut libc::sf_hdtr,
0)
};
(Errno::result(return_code).and(Ok(())), len)
}
}
}