library/std/src/os/fd/tests.rs

   1 #[cfg(any(unix, target_os = "wasi"))]
   2 #[test]
   3 fn test_raw_fd() {
   4     #[cfg(unix)]
   5     use crate::os::unix::io::{AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd};
   6     #[cfg(target_os = "wasi")]
   7     use crate::os::wasi::io::{AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd};
   8
   9     let raw_fd: RawFd = crate::io::stdin().as_raw_fd();
  10
  11     let stdin_as_file = unsafe { crate::fs::File::from_raw_fd(raw_fd) };
  12     assert_eq!(stdin_as_file.as_raw_fd(), raw_fd);
  13     assert_eq!(unsafe { BorrowedFd::borrow_raw(raw_fd).as_raw_fd() }, raw_fd);
  14     assert_eq!(stdin_as_file.into_raw_fd(), 0);
  15 }
  16
  17 #[cfg(any(unix, target_os = "wasi"))]
  18 #[test]
  19 fn test_fd() {
  20     #[cfg(unix)]
  21     use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
  22     #[cfg(target_os = "wasi")]
  23     use crate::os::wasi::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
  24
  25     let stdin = crate::io::stdin();
  26     let fd: BorrowedFd<'_> = stdin.as_fd();
  27     let raw_fd: RawFd = fd.as_raw_fd();
  28     let owned_fd: OwnedFd = unsafe { OwnedFd::from_raw_fd(raw_fd) };
  29
  30     let stdin_as_file = crate::fs::File::from(owned_fd);
  31
  32     assert_eq!(stdin_as_file.as_fd().as_raw_fd(), raw_fd);
  33     assert_eq!(Into::<OwnedFd>::into(stdin_as_file).into_raw_fd(), raw_fd);
  34 }
  35
  36 #[cfg(any(unix, target_os = "wasi"))]
  37 #[test]
  38 fn test_niche_optimizations() {
  39     use crate::mem::size_of;
  40     #[cfg(unix)]
  41     use crate::os::unix::io::{BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
  42     #[cfg(target_os = "wasi")]
  43     use crate::os::wasi::io::{BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
  44
  45     assert_eq!(size_of::<Option<OwnedFd>>(), size_of::<RawFd>());
  46     assert_eq!(size_of::<Option<BorrowedFd<'static>>>(), size_of::<RawFd>());
  47     unsafe {
  48         assert_eq!(OwnedFd::from_raw_fd(RawFd::MIN).into_raw_fd(), RawFd::MIN);
  49         assert_eq!(OwnedFd::from_raw_fd(RawFd::MAX).into_raw_fd(), RawFd::MAX);
  50         assert_eq!(Some(OwnedFd::from_raw_fd(RawFd::MIN)).unwrap().into_raw_fd(), RawFd::MIN);
  51         assert_eq!(Some(OwnedFd::from_raw_fd(RawFd::MAX)).unwrap().into_raw_fd(), RawFd::MAX);
  52     }
  53 }