libxen 0.5.0

Safe bindings for Xen libraries
Documentation 
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

use xen_sys::{
    xenforeignmemory_close, xenforeignmemory_handle, xenforeignmemory_open, xentoollog_logger,
};

use crate::XenError;

#[derive(Debug, Clone)]
pub struct XenForeignMemoryHandle(pub(crate) *mut xenforeignmemory_handle);

impl XenForeignMemoryHandle {
    pub fn new() -> Result<Self, XenError> {
        Self::new_with_options(None, 0)
    }

    pub fn new_with_options(
        logger: Option<&mut xentoollog_logger>,
        flags: u32,
    ) -> Result<Self, XenError> {
        let handle = unsafe {
            xenforeignmemory_open(
                logger.map_or_else(std::ptr::null_mut, |p| p as *mut _),
                flags,
            )
        };

        if handle.is_null() {
            return Err(XenError::Other("Failed to open Xen event channel"));
        }

        Ok(Self(handle))
    }
}

impl Drop for XenForeignMemoryHandle {
    fn drop(&mut self) {
        tracing::trace!("closing Xen foreign memory handle");
        unsafe {
            xenforeignmemory_close(self.0);
        }
    }
}