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
|
#![unstable(reason = "not public", issue = "none", feature = "fd")]
use crate::cmp;
use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, Read, SeekFrom};
use crate::os::hermit::hermit_abi;
use crate::os::hermit::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
use crate::sys::{cvt, unsupported};
use crate::sys_common::{AsInner, FromInner, IntoInner};
const fn max_iov() -> usize {
hermit_abi::IOV_MAX
}
#[derive(Debug)]
pub struct FileDesc {
fd: OwnedFd,
}
impl FileDesc {
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
let result =
cvt(unsafe { hermit_abi::read(self.fd.as_raw_fd(), buf.as_mut_ptr(), buf.len()) })?;
Ok(result as usize)
}
pub fn read_buf(&self, mut buf: BorrowedCursor<'_>) -> io::Result<()> {
// SAFETY: The `read` syscall does not read from the buffer, so it is
// safe to use `&mut [MaybeUninit<u8>]`.
let result = cvt(unsafe {
hermit_abi::read(
self.fd.as_raw_fd(),
buf.as_mut().as_mut_ptr() as *mut u8,
buf.capacity(),
)
})?;
// SAFETY: Exactly `result` bytes have been filled.
unsafe { buf.advance_unchecked(result as usize) };
Ok(())
}
pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
let ret = cvt(unsafe {
hermit_abi::readv(
self.as_raw_fd(),
bufs.as_mut_ptr() as *mut hermit_abi::iovec as *const hermit_abi::iovec,
cmp::min(bufs.len(), max_iov()),
)
})?;
Ok(ret as usize)
}
#[inline]
pub fn is_read_vectored(&self) -> bool {
true
}
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 =
cvt(unsafe { hermit_abi::write(self.fd.as_raw_fd(), buf.as_ptr(), buf.len()) })?;
Ok(result as usize)
}
pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
let ret = cvt(unsafe {
hermit_abi::writev(
self.as_raw_fd(),
bufs.as_ptr() as *const hermit_abi::iovec,
cmp::min(bufs.len(), max_iov()),
)
})?;
Ok(ret as usize)
}
#[inline]
pub fn is_write_vectored(&self) -> bool {
true
}
pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> {
let (whence, pos) = match pos {
// Casting to `i64` is fine, too large values will end up as
// negative which will cause an error in `lseek`.
SeekFrom::Start(off) => (hermit_abi::SEEK_SET, off as i64),
SeekFrom::End(off) => (hermit_abi::SEEK_END, off),
SeekFrom::Current(off) => (hermit_abi::SEEK_CUR, off),
};
let n = cvt(unsafe { hermit_abi::lseek(self.as_raw_fd(), pos as isize, whence) })?;
Ok(n as u64)
}
pub fn tell(&self) -> io::Result<u64> {
self.seek(SeekFrom::Current(0))
}
pub fn duplicate(&self) -> io::Result<FileDesc> {
self.duplicate_path(&[])
}
pub fn duplicate_path(&self, _path: &[u8]) -> io::Result<FileDesc> {
unsupported()
}
pub fn nonblocking(&self) -> io::Result<bool> {
Ok(false)
}
pub fn set_cloexec(&self) -> io::Result<()> {
unsupported()
}
pub fn set_nonblocking(&self, _nonblocking: bool) -> io::Result<()> {
unsupported()
}
pub fn fstat(&self, stat: *mut hermit_abi::stat) -> io::Result<()> {
cvt(unsafe { hermit_abi::fstat(self.fd.as_raw_fd(), stat) })?;
Ok(())
}
}
impl<'a> Read for &'a FileDesc {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
(**self).read(buf)
}
}
impl IntoInner<OwnedFd> for FileDesc {
fn into_inner(self) -> OwnedFd {
self.fd
}
}
impl FromInner<OwnedFd> for FileDesc {
fn from_inner(owned_fd: OwnedFd) -> Self {
Self { fd: owned_fd }
}
}
impl FromRawFd for FileDesc {
unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
let fd = unsafe { OwnedFd::from_raw_fd(raw_fd) };
Self { fd }
}
}
impl AsInner<OwnedFd> for FileDesc {
#[inline]
fn as_inner(&self) -> &OwnedFd {
&self.fd
}
}
impl AsFd for FileDesc {
fn as_fd(&self) -> BorrowedFd<'_> {
self.fd.as_fd()
}
}
impl AsRawFd for FileDesc {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.fd.as_raw_fd()
}
}
impl IntoRawFd for FileDesc {
fn into_raw_fd(self) -> RawFd {
self.fd.into_raw_fd()
}
}
|
