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
|
//! Raw Unix-like file descriptors.
#![stable(feature = "rust1", since = "1.0.0")]
use crate::fs;
use crate::io;
#[cfg(target_os = "hermit")]
use crate::os::hermit::io::OwnedFd;
#[cfg(not(target_os = "hermit"))]
use crate::os::raw;
#[cfg(all(doc, not(target_arch = "wasm32")))]
use crate::os::unix::io::AsFd;
#[cfg(unix)]
use crate::os::unix::io::OwnedFd;
#[cfg(target_os = "wasi")]
use crate::os::wasi::io::OwnedFd;
use crate::sys_common::{AsInner, IntoInner};
#[cfg(target_os = "hermit")]
use hermit_abi as libc;
/// Raw file descriptors.
#[rustc_allowed_through_unstable_modules]
#[stable(feature = "rust1", since = "1.0.0")]
#[cfg(not(target_os = "hermit"))]
pub type RawFd = raw::c_int;
#[rustc_allowed_through_unstable_modules]
#[stable(feature = "rust1", since = "1.0.0")]
#[cfg(target_os = "hermit")]
pub type RawFd = i32;
/// A trait to extract the raw file descriptor from an underlying object.
///
/// This is only available on unix and WASI platforms and must be imported in
/// order to call the method. Windows platforms have a corresponding
/// `AsRawHandle` and `AsRawSocket` set of traits.
#[rustc_allowed_through_unstable_modules]
#[stable(feature = "rust1", since = "1.0.0")]
pub trait AsRawFd {
/// Extracts the raw file descriptor.
///
/// This function is typically used to **borrow** an owned file descriptor.
/// When used in this way, this method does **not** pass ownership of the
/// raw file descriptor to the caller, and the file descriptor is only
/// guaranteed to be valid while the original object has not yet been
/// destroyed.
///
/// However, borrowing is not strictly required. See [`AsFd::as_fd`]
/// for an API which strictly borrows a file descriptor.
///
/// # Example
///
/// ```no_run
/// use std::fs::File;
/// # use std::io;
/// #[cfg(any(unix, target_os = "wasi"))]
/// use std::os::fd::{AsRawFd, RawFd};
///
/// let mut f = File::open("foo.txt")?;
/// // Note that `raw_fd` is only valid as long as `f` exists.
/// #[cfg(any(unix, target_os = "wasi"))]
/// let raw_fd: RawFd = f.as_raw_fd();
/// # Ok::<(), io::Error>(())
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
fn as_raw_fd(&self) -> RawFd;
}
/// A trait to express the ability to construct an object from a raw file
/// descriptor.
#[rustc_allowed_through_unstable_modules]
#[stable(feature = "from_raw_os", since = "1.1.0")]
pub trait FromRawFd {
/// Constructs a new instance of `Self` from the given raw file
/// descriptor.
///
/// This function is typically used to **consume ownership** of the
/// specified file descriptor. When used in this way, the returned object
/// will take responsibility for closing it when the object goes out of
/// scope.
///
/// However, consuming ownership is not strictly required. Use a
/// [`From<OwnedFd>::from`] implementation for an API which strictly
/// consumes ownership.
///
/// # Safety
///
/// The `fd` passed in must be an [owned file descriptor][io-safety];
/// in particular, it must be open.
///
/// [io-safety]: io#io-safety
///
/// # Example
///
/// ```no_run
/// use std::fs::File;
/// # use std::io;
/// #[cfg(any(unix, target_os = "wasi"))]
/// use std::os::fd::{FromRawFd, IntoRawFd, RawFd};
///
/// let f = File::open("foo.txt")?;
/// # #[cfg(any(unix, target_os = "wasi"))]
/// let raw_fd: RawFd = f.into_raw_fd();
/// // SAFETY: no other functions should call `from_raw_fd`, so there
/// // is only one owner for the file descriptor.
/// # #[cfg(any(unix, target_os = "wasi"))]
/// let f = unsafe { File::from_raw_fd(raw_fd) };
/// # Ok::<(), io::Error>(())
/// ```
#[stable(feature = "from_raw_os", since = "1.1.0")]
unsafe fn from_raw_fd(fd: RawFd) -> Self;
}
/// A trait to express the ability to consume an object and acquire ownership of
/// its raw file descriptor.
#[rustc_allowed_through_unstable_modules]
#[stable(feature = "into_raw_os", since = "1.4.0")]
pub trait IntoRawFd {
/// Consumes this object, returning the raw underlying file descriptor.
///
/// This function is typically used to **transfer ownership** of the underlying
/// file descriptor to the caller. When used in this way, callers are then the unique
/// owners of the file descriptor and must close it once it's no longer needed.
///
/// However, transferring ownership is not strictly required. Use a
/// [`Into<OwnedFd>::into`] implementation for an API which strictly
/// transfers ownership.
///
/// # Example
///
/// ```no_run
/// use std::fs::File;
/// # use std::io;
/// #[cfg(any(unix, target_os = "wasi"))]
/// use std::os::fd::{IntoRawFd, RawFd};
///
/// let f = File::open("foo.txt")?;
/// #[cfg(any(unix, target_os = "wasi"))]
/// let raw_fd: RawFd = f.into_raw_fd();
/// # Ok::<(), io::Error>(())
/// ```
#[stable(feature = "into_raw_os", since = "1.4.0")]
fn into_raw_fd(self) -> RawFd;
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl AsRawFd for RawFd {
#[inline]
fn as_raw_fd(&self) -> RawFd {
*self
}
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl IntoRawFd for RawFd {
#[inline]
fn into_raw_fd(self) -> RawFd {
self
}
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl FromRawFd for RawFd {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> RawFd {
fd
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl AsRawFd for fs::File {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.as_inner().as_raw_fd()
}
}
#[stable(feature = "from_raw_os", since = "1.1.0")]
impl FromRawFd for fs::File {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> fs::File {
unsafe { fs::File::from(OwnedFd::from_raw_fd(fd)) }
}
}
#[stable(feature = "into_raw_os", since = "1.4.0")]
impl IntoRawFd for fs::File {
#[inline]
fn into_raw_fd(self) -> RawFd {
self.into_inner().into_inner().into_raw_fd()
}
}
#[stable(feature = "asraw_stdio", since = "1.21.0")]
impl AsRawFd for io::Stdin {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDIN_FILENO
}
}
#[stable(feature = "asraw_stdio", since = "1.21.0")]
impl AsRawFd for io::Stdout {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDOUT_FILENO
}
}
#[stable(feature = "asraw_stdio", since = "1.21.0")]
impl AsRawFd for io::Stderr {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDERR_FILENO
}
}
#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
impl<'a> AsRawFd for io::StdinLock<'a> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDIN_FILENO
}
}
#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
impl<'a> AsRawFd for io::StdoutLock<'a> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDOUT_FILENO
}
}
#[stable(feature = "asraw_stdio_locks", since = "1.35.0")]
impl<'a> AsRawFd for io::StderrLock<'a> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
libc::STDERR_FILENO
}
}
/// This impl allows implementing traits that require `AsRawFd` on Arc.
/// ```
/// # #[cfg(any(unix, target_os = "wasi"))] mod group_cfg {
/// # #[cfg(target_os = "wasi")]
/// # use std::os::wasi::io::AsRawFd;
/// # #[cfg(unix)]
/// # use std::os::unix::io::AsRawFd;
/// use std::net::UdpSocket;
/// use std::sync::Arc;
/// trait MyTrait: AsRawFd {
/// }
/// impl MyTrait for Arc<UdpSocket> {}
/// impl MyTrait for Box<UdpSocket> {}
/// # }
/// ```
#[stable(feature = "asrawfd_ptrs", since = "1.63.0")]
impl<T: AsRawFd> AsRawFd for crate::sync::Arc<T> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
(**self).as_raw_fd()
}
}
#[stable(feature = "asfd_rc", since = "1.69.0")]
impl<T: AsRawFd> AsRawFd for crate::rc::Rc<T> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
(**self).as_raw_fd()
}
}
#[stable(feature = "asrawfd_ptrs", since = "1.63.0")]
impl<T: AsRawFd> AsRawFd for Box<T> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
(**self).as_raw_fd()
}
}
|