rutabaga_gfx/rutabaga_os/
shm.rs

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
// Copyright 2020 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use std::ffi::CString;

use crate::rutabaga_os::sys::platform::SharedMemory as SysUtilSharedMemory;
use crate::rutabaga_os::AsRawDescriptor;
use crate::rutabaga_os::FromRawDescriptor;
use crate::rutabaga_os::IntoRawDescriptor;
use crate::rutabaga_os::RawDescriptor;
use crate::rutabaga_os::SafeDescriptor;
use crate::rutabaga_utils::RutabagaResult;

pub struct SharedMemory(pub(crate) SysUtilSharedMemory);
impl SharedMemory {
    /// Creates a new shared memory object of the given size.
    ///
    /// |name| is purely for debugging purposes. It does not need to be unique, and it does
    /// not affect any non-debugging related properties of the constructed shared memory.
    pub fn new<T: Into<Vec<u8>>>(debug_name: T, size: u64) -> RutabagaResult<SharedMemory> {
        let debug_name = CString::new(debug_name)?;
        SysUtilSharedMemory::new(&debug_name, size).map(SharedMemory)
    }

    pub fn size(&self) -> u64 {
        self.0.size()
    }
}

impl AsRawDescriptor for SharedMemory {
    fn as_raw_descriptor(&self) -> RawDescriptor {
        self.0.as_raw_descriptor()
    }
}

impl IntoRawDescriptor for SharedMemory {
    fn into_raw_descriptor(self) -> RawDescriptor {
        self.0.into_raw_descriptor()
    }
}

impl From<SharedMemory> for SafeDescriptor {
    fn from(sm: SharedMemory) -> SafeDescriptor {
        // SAFETY:
        // Safe because we own the SharedMemory at this point.
        unsafe { SafeDescriptor::from_raw_descriptor(sm.into_raw_descriptor()) }
    }
}