1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
#[cfg(not(io_safety_is_in_std))]
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
use crate::BorrowedFd;
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
use crate::OwnedFd;
#[cfg(not(io_safety_is_in_std))]
#[cfg(windows)]
use crate::{BorrowedHandle, BorrowedSocket};
#[cfg(windows)]
use crate::{OwnedHandle, OwnedSocket};

/// A trait to borrow the file descriptor from an underlying object.
///
/// This is only available on unix platforms and must be imported in order to
/// call the method. Windows platforms have a corresponding `AsHandle` and
/// `AsSocket` set of traits.
#[cfg(not(io_safety_is_in_std))]
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
pub trait AsFd {
    /// Borrows the file descriptor.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{AsFd, BorrowedFd};
    ///
    /// let mut f = File::open("foo.txt")?;
    /// let borrowed_fd: BorrowedFd<'_> = f.as_fd();
    /// # Ok::<(), io::Error>(())
    /// ```
    fn as_fd(&self) -> BorrowedFd<'_>;
}

/// A trait to borrow the handle from an underlying object.
#[cfg(not(io_safety_is_in_std))]
#[cfg(windows)]
pub trait AsHandle {
    /// Borrows the handle.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{AsHandle, BorrowedHandle};
    ///
    /// let mut f = File::open("foo.txt")?;
    /// let borrowed_handle: BorrowedHandle<'_> = f.as_handle();
    /// # Ok::<(), io::Error>(())
    /// ```
    fn as_handle(&self) -> BorrowedHandle<'_>;
}

/// A trait to borrow the socket from an underlying object.
#[cfg(not(io_safety_is_in_std))]
#[cfg(windows)]
pub trait AsSocket {
    /// Borrows the socket.
    fn as_socket(&self) -> BorrowedSocket<'_>;
}

/// A trait to express the ability to consume an object and acquire ownership
/// of its file descriptor.
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
#[deprecated(
    since = "1.0.0",
    note = "`IntoFd` is replaced by `From<...> for OwnedFd` or `Into<OwnedFd>`"
)]
pub trait IntoFd {
    /// Consumes this object, returning the underlying file descriptor.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{IntoFd, OwnedFd};
    ///
    /// let f = File::open("foo.txt")?;
    /// let owned_fd: OwnedFd = f.into_fd();
    /// # Ok::<(), io::Error>(())
    /// ```
    fn into_fd(self) -> OwnedFd;
}

/// A trait to express the ability to consume an object and acquire ownership
/// of its handle.
#[cfg(windows)]
#[deprecated(
    since = "1.0.0",
    note = "`IntoHandle` is replaced by `From<...> for OwnedHandle` or `Into<OwnedHandle>`"
)]
pub trait IntoHandle {
    /// Consumes this object, returning the underlying handle.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{IntoHandle, OwnedHandle};
    ///
    /// let f = File::open("foo.txt")?;
    /// let owned_handle: OwnedHandle = f.into_handle();
    /// # Ok::<(), io::Error>(())
    /// ```
    fn into_handle(self) -> OwnedHandle;
}

/// A trait to express the ability to consume an object and acquire ownership
/// of its socket.
#[cfg(windows)]
#[deprecated(
    since = "1.0.0",
    note = "`IntoSocket` is replaced by `From<...> for OwnedSocket` or `Into<OwnedSocket>`"
)]
pub trait IntoSocket {
    /// Consumes this object, returning the underlying socket.
    fn into_socket(self) -> OwnedSocket;
}

/// A trait to express the ability to construct an object from a file
/// descriptor.
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
pub trait FromFd {
    /// Constructs a new instance of `Self` from the given file descriptor.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{FromFd, IntoFd, OwnedFd};
    ///
    /// let f = File::open("foo.txt")?;
    /// let owned_fd: OwnedFd = f.into_fd();
    /// let f = File::from_fd(owned_fd);
    /// # Ok::<(), io::Error>(())
    /// ```
    #[deprecated(
        since = "1.0.0",
        note = "`FromFd::from_fd` is replaced by `From<OwnedFd>::from`"
    )]
    fn from_fd(owned: OwnedFd) -> Self;

    /// Constructs a new instance of `Self` from the given file descriptor
    /// converted from `into_owned`.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{FromFd, IntoFd};
    ///
    /// let f = File::open("foo.txt")?;
    /// let f = File::from_into_fd(f);
    /// # Ok::<(), io::Error>(())
    /// ```
    #[inline]
    fn from_into_fd<Owned: Into<OwnedFd>>(into_owned: Owned) -> Self
    where
        Self: Sized + From<OwnedFd>,
    {
        Self::from(into_owned.into())
    }
}

/// A trait to express the ability to construct an object from a handle.
#[cfg(windows)]
pub trait FromHandle {
    /// Constructs a new instance of `Self` from the given handle.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{FromHandle, IntoHandle, OwnedHandle};
    ///
    /// let f = File::open("foo.txt")?;
    /// let owned_handle: OwnedHandle = f.into_handle();
    /// let f = File::from_handle(owned_handle);
    /// # Ok::<(), io::Error>(())
    /// ```
    #[deprecated(
        since = "1.0.0",
        note = "`FromHandle::from_handle` is replaced by `From<OwnedHandle>::from`"
    )]
    fn from_handle(owned: OwnedHandle) -> Self;

    /// Constructs a new instance of `Self` from the given handle converted
    /// from `into_owned`.
    ///
    /// # Example
    ///
    /// ```rust,no_run
    /// use std::fs::File;
    /// # use std::io;
    /// use io_lifetimes::{FromHandle, IntoHandle};
    ///
    /// let f = File::open("foo.txt")?;
    /// let f = File::from_into_handle(f);
    /// # Ok::<(), io::Error>(())
    /// ```
    #[inline]
    fn from_into_handle<Owned: Into<OwnedHandle>>(into_owned: Owned) -> Self
    where
        Self: Sized + From<OwnedHandle>,
    {
        Self::from(into_owned.into())
    }
}

/// A trait to express the ability to construct an object from a socket.
#[cfg(windows)]
pub trait FromSocket {
    /// Constructs a new instance of `Self` from the given socket.
    #[deprecated(
        since = "1.0.0",
        note = "`FromSocket::from_socket` is replaced by `From<OwnedSocket>::from`"
    )]
    fn from_socket(owned: OwnedSocket) -> Self;

    /// Constructs a new instance of `Self` from the given socket converted
    /// from `into_owned`.
    #[inline]
    fn from_into_socket<Owned: Into<OwnedSocket>>(into_owned: Owned) -> Self
    where
        Self: Sized + From<OwnedSocket>,
    {
        Self::from(into_owned.into())
    }
}

#[cfg(not(io_safety_is_in_std))]
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
impl<T: AsFd> AsFd for &T {
    #[inline]
    fn as_fd(&self) -> BorrowedFd<'_> {
        T::as_fd(self)
    }
}

#[cfg(not(io_safety_is_in_std))]
#[cfg(any(unix, target_os = "wasi", target_os = "hermit"))]
impl<T: AsFd> AsFd for &mut T {
    #[inline]
    fn as_fd(&self) -> BorrowedFd<'_> {
        T::as_fd(self)
    }
}

#[cfg(not(io_safety_is_in_std))]
#[cfg(windows)]
impl<T: AsHandle> AsHandle for &T {
    #[inline]
    fn as_handle(&self) -> BorrowedHandle<'_> {
        T::as_handle(self)
    }
}

#[cfg(not(io_safety_is_in_std))]
#[cfg(windows)]
impl<T: AsHandle> AsHandle for &mut T {
    #[inline]
    fn as_handle(&self) -> BorrowedHandle<'_> {
        T::as_handle(self)
    }
}

#[cfg(not(io_safety_is_in_std))]
#[cfg(windows)]
impl<T: AsSocket> AsSocket for &T {
    #[inline]
    fn as_socket(&self) -> BorrowedSocket<'_> {
        T::as_socket(self)
    }
}

#[cfg(not(io_safety_is_in_std))]
#[cfg(windows)]
impl<T: AsSocket> AsSocket for &mut T {
    #[inline]
    fn as_socket(&self) -> BorrowedSocket<'_> {
        T::as_socket(self)
    }
}