use std::fs::File; use std::io; // A stable alternative to https://doc.rust-lang.org/stable/std/primitive.never.html enum Never {} pub struct MmapInner { never: Never, } impl MmapInner { fn new() -> io::Result { Err(io::Error::new( io::ErrorKind::Other, "platform not supported", )) } pub fn map(_: usize, _: &File, _: u64, _: bool) -> io::Result { MmapInner::new() } pub fn map_exec(_: usize, _: &File, _: u64, _: bool) -> io::Result { MmapInner::new() } pub fn map_mut(_: usize, _: &File, _: u64, _: bool) -> io::Result { MmapInner::new() } pub fn map_copy(_: usize, _: &File, _: u64, _: bool) -> io::Result { MmapInner::new() } pub fn map_copy_read_only(_: usize, _: &File, _: u64, _: bool) -> io::Result { MmapInner::new() } pub fn map_anon(_: usize, _: bool, _: bool, _: Option) -> io::Result { MmapInner::new() } pub fn flush(&self, _: usize, _: usize) -> io::Result<()> { match self.never {} } pub fn flush_async(&self, _: usize, _: usize) -> io::Result<()> { match self.never {} } pub fn make_read_only(&mut self) -> io::Result<()> { match self.never {} } pub fn make_exec(&mut self) -> io::Result<()> { match self.never {} } pub fn make_mut(&mut self) -> io::Result<()> { match self.never {} } #[inline] pub fn ptr(&self) -> *const u8 { match self.never {} } #[inline] pub fn mut_ptr(&mut self) -> *mut u8 { match self.never {} } #[inline] pub fn len(&self) -> usize { match self.never {} } } pub fn file_len(file: &File) -> io::Result { Ok(file.metadata()?.len()) }