backtrace/symbolize/gimli/
mmap_unix.rs

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1use super::mystd::fs::File;
2use super::mystd::os::unix::prelude::*;
3use core::ops::Deref;
4use core::ptr;
5use core::slice;
6
7#[cfg(not(all(target_os = "linux", target_env = "gnu")))]
8use libc::mmap as mmap64;
9#[cfg(all(target_os = "linux", target_env = "gnu"))]
10use libc::mmap64;
11
12pub struct Mmap {
13    ptr: *mut libc::c_void,
14    len: usize,
15}
16
17impl Mmap {
18    pub unsafe fn map(file: &File, len: usize, offset: u64) -> Option<Mmap> {
19        let ptr = unsafe {
20            mmap64(
21                ptr::null_mut(),
22                len,
23                libc::PROT_READ,
24                libc::MAP_PRIVATE,
25                file.as_raw_fd(),
26                offset.try_into().ok()?,
27            )
28        };
29        if ptr == libc::MAP_FAILED {
30            return None;
31        }
32        Some(Mmap { ptr, len })
33    }
34}
35
36impl Deref for Mmap {
37    type Target = [u8];
38
39    fn deref(&self) -> &[u8] {
40        unsafe { slice::from_raw_parts(self.ptr as *const u8, self.len) }
41    }
42}
43
44impl Drop for Mmap {
45    fn drop(&mut self) {
46        unsafe {
47            let r = libc::munmap(self.ptr, self.len);
48            debug_assert_eq!(r, 0);
49        }
50    }
51}
backtrace/symbolize/gimli/mmap_unix.rs

backtrace/symbolize/gimli/
mmap_unix.rs
