src/libstd/sys/vxworks/ext/io.rs

   1 //! Unix-specific extensions to general I/O primitives
   2
   3 #![stable(feature = "rust1", since = "1.0.0")]
   4
   5 use crate::fs;
   6 use crate::os::raw;
   7 use crate::sys;
   8 use crate::io;
   9 use crate::sys_common::{AsInner, FromInner, IntoInner};
  10
  11 /// Raw file descriptors.
  12 #[stable(feature = "rust1", since = "1.0.0")]
  13 pub type RawFd = raw::c_int;
  14
  15 /// A trait to extract the raw unix file descriptor from an underlying
  16 /// object.
  17 ///
  18 /// This is only available on unix platforms and must be imported in order
  19 /// to call the method. Windows platforms have a corresponding `AsRawHandle`
  20 /// and `AsRawSocket` set of traits.
  21 #[stable(feature = "rust1", since = "1.0.0")]
  22 pub trait AsRawFd {
  23     /// Extracts the raw file descriptor.
  24     ///
  25     /// This method does **not** pass ownership of the raw file descriptor
  26     /// to the caller. The descriptor is only guaranteed to be valid while
  27     /// the original object has not yet been destroyed.
  28     #[stable(feature = "rust1", since = "1.0.0")]
  29     fn as_raw_fd(&self) -> RawFd;
  30 }
  31
  32 /// A trait to express the ability to construct an object from a raw file
  33 /// descriptor.
  34 #[stable(feature = "from_raw_os", since = "1.1.0")]
  35 pub trait FromRawFd {
  36     /// Constructs a new instance of `Self` from the given raw file
  37     /// descriptor.
  38     ///
  39     /// This function **consumes ownership** of the specified file
  40     /// descriptor. The returned object will take responsibility for closing
  41     /// it when the object goes out of scope.
  42     ///
  43     /// This function is also unsafe as the primitives currently returned
  44     /// have the contract that they are the sole owner of the file
  45     /// descriptor they are wrapping. Usage of this function could
  46     /// accidentally allow violating this contract which can cause memory
  47     /// unsafety in code that relies on it being true.
  48     #[stable(feature = "from_raw_os", since = "1.1.0")]
  49     unsafe fn from_raw_fd(fd: RawFd) -> Self;
  50 }
  51
  52 /// A trait to express the ability to consume an object and acquire ownership of
  53 /// its raw file descriptor.
  54 #[stable(feature = "into_raw_os", since = "1.4.0")]
  55 pub trait IntoRawFd {
  56     /// Consumes this object, returning the raw underlying file descriptor.
  57     ///
  58     /// This function **transfers ownership** of the underlying file descriptor
  59     /// to the caller. Callers are then the unique owners of the file descriptor
  60     /// and must close the descriptor once it's no longer needed.
  61     #[stable(feature = "into_raw_os", since = "1.4.0")]
  62     fn into_raw_fd(self) -> RawFd;
  63 }
  64
  65 #[stable(feature = "rust1", since = "1.0.0")]
  66 impl AsRawFd for fs::File {
  67     fn as_raw_fd(&self) -> RawFd {
  68         self.as_inner().fd().raw()
  69     }
  70 }
  71 #[stable(feature = "from_raw_os", since = "1.1.0")]
  72 impl FromRawFd for fs::File {
  73     unsafe fn from_raw_fd(fd: RawFd) -> fs::File {
  74         fs::File::from_inner(sys::fs::File::from_inner(fd))
  75     }
  76 }
  77 #[stable(feature = "into_raw_os", since = "1.4.0")]
  78 impl IntoRawFd for fs::File {
  79     fn into_raw_fd(self) -> RawFd {
  80         self.into_inner().into_fd().into_raw()
  81     }
  82 }
  83
  84 #[stable(feature = "asraw_stdio", since = "1.21.0")]
  85 impl AsRawFd for io::Stdin {
  86     fn as_raw_fd(&self) -> RawFd { libc::STDIN_FILENO }
  87 }
  88
  89 #[stable(feature = "asraw_stdio", since = "1.21.0")]
  90 impl AsRawFd for io::Stdout {
  91     fn as_raw_fd(&self) -> RawFd { libc::STDOUT_FILENO }
  92 }
  93
  94 #[stable(feature = "asraw_stdio", since = "1.21.0")]
  95 impl AsRawFd for io::Stderr {
  96     fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO }
  97 }
  98
  99 #[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
 100 impl<'a> AsRawFd for io::StdinLock<'a> {
 101     fn as_raw_fd(&self) -> RawFd { libc::STDIN_FILENO }
 102 }
 103
 104 #[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
 105 impl<'a> AsRawFd for io::StdoutLock<'a> {
 106     fn as_raw_fd(&self) -> RawFd { libc::STDOUT_FILENO }
 107 }
 108
 109 #[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
 110 impl<'a> AsRawFd for io::StderrLock<'a> {
 111     fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO }
 112 }