Remove unused methods on Hermit FileDesc

Author: thaliaarchi

library/std/src/sys/pal/hermit/fd.rs

@@ -2,9 +2,9 @@
 
 use super::hermit_abi;
 use crate::cmp;
-use crate::io::{self, IoSlice, IoSliceMut, Read};
+use crate::io::{self, IoSlice, IoSliceMut};
 use crate::os::hermit::io::{FromRawFd, OwnedFd, RawFd, *};
-use crate::sys::{cvt, unsupported};
+use crate::sys::cvt;
 use crate::sys_common::{AsInner, FromInner, IntoInner};
 
 const fn max_iov() -> usize {
@@ -39,11 +39,6 @@ impl FileDesc {
         true
     }
 
-    pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        let mut me = self;
-        (&mut me).read_to_end(buf)
-    }
-
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         let result =
             cvt(unsafe { hermit_abi::write(self.fd.as_raw_fd(), buf.as_ptr(), buf.len()) })?;
@@ -66,37 +61,12 @@ impl FileDesc {
         true
     }
 
-    pub fn duplicate(&self) -> io::Result<FileDesc> {
-        self.duplicate_path(&[])
-    }
-    pub fn duplicate_path(&self, _path: &[u8]) -> io::Result<FileDesc> {
-        unsupported()
-    }
-
-    pub fn nonblocking(&self) -> io::Result<bool> {
-        Ok(false)
-    }
-
-    pub fn set_cloexec(&self) -> io::Result<()> {
-        unsupported()
-    }
-
-    pub fn set_nonblocking(&self, _nonblocking: bool) -> io::Result<()> {
-        unsupported()
-    }
-
     pub fn fstat(&self, stat: *mut hermit_abi::stat) -> io::Result<()> {
         cvt(unsafe { hermit_abi::fstat(self.fd.as_raw_fd(), stat) })?;
         Ok(())
     }
 }
 
-impl<'a> Read for &'a FileDesc {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        (**self).read(buf)
-    }
-}
-
 impl IntoInner<OwnedFd> for FileDesc {
     fn into_inner(self) -> OwnedFd {
         self.fd