| #![unstable(reason = "not public", issue = "none", feature = "fd")] |
| |
| use crate::io::{self, ErrorKind, Read}; |
| use crate::mem; |
| use crate::sys::cvt; |
| use crate::sys::hermit::abi; |
| use crate::sys_common::AsInner; |
| |
| #[derive(Debug)] |
| pub struct FileDesc { |
| fd: i32, |
| } |
| |
| impl FileDesc { |
| pub fn new(fd: i32) -> FileDesc { |
| FileDesc { fd } |
| } |
| |
| pub fn raw(&self) -> i32 { |
| self.fd |
| } |
| |
| /// Extracts the actual file descriptor without closing it. |
| pub fn into_raw(self) -> i32 { |
| let fd = self.fd; |
| mem::forget(self); |
| fd |
| } |
| |
| pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> { |
| let result = unsafe { abi::read(self.fd, buf.as_mut_ptr(), buf.len()) }; |
| cvt(result as i32) |
| } |
| |
| 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 = unsafe { abi::write(self.fd, buf.as_ptr(), buf.len()) }; |
| cvt(result as i32) |
| } |
| |
| pub fn duplicate(&self) -> io::Result<FileDesc> { |
| self.duplicate_path(&[]) |
| } |
| pub fn duplicate_path(&self, _path: &[u8]) -> io::Result<FileDesc> { |
| Err(io::Error::new(ErrorKind::Other, "duplicate isn't supported")) |
| } |
| |
| pub fn nonblocking(&self) -> io::Result<bool> { |
| Ok(false) |
| } |
| |
| pub fn set_cloexec(&self) -> io::Result<()> { |
| Err(io::Error::new(ErrorKind::Other, "cloexec isn't supported")) |
| } |
| |
| pub fn set_nonblocking(&self, _nonblocking: bool) -> io::Result<()> { |
| Err(io::Error::new(ErrorKind::Other, "nonblocking isn't supported")) |
| } |
| } |
| |
| impl<'a> Read for &'a FileDesc { |
| fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> { |
| (**self).read(buf) |
| } |
| } |
| |
| impl AsInner<i32> for FileDesc { |
| fn as_inner(&self) -> &i32 { |
| &self.fd |
| } |
| } |
| |
| impl Drop for FileDesc { |
| fn drop(&mut self) { |
| // Note that errors are ignored when closing a file descriptor. The |
| // reason for this is that if an error occurs we don't actually know if |
| // the file descriptor was closed or not, and if we retried (for |
| // something like EINTR), we might close another valid file descriptor |
| // (opened after we closed ours. |
| let _ = unsafe { abi::close(self.fd) }; |
| } |
| } |