diff options
Diffstat (limited to 'vendor/backtrace/src/symbolize/gimli/mmap_unix.rs')
-rw-r--r-- | vendor/backtrace/src/symbolize/gimli/mmap_unix.rs | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/vendor/backtrace/src/symbolize/gimli/mmap_unix.rs b/vendor/backtrace/src/symbolize/gimli/mmap_unix.rs new file mode 100644 index 000000000..5806c9f7e --- /dev/null +++ b/vendor/backtrace/src/symbolize/gimli/mmap_unix.rs @@ -0,0 +1,44 @@ +use super::mystd::fs::File; +use super::mystd::os::unix::prelude::*; +use core::ops::Deref; +use core::ptr; +use core::slice; + +pub struct Mmap { + ptr: *mut libc::c_void, + len: usize, +} + +impl Mmap { + pub unsafe fn map(file: &File, len: usize) -> Option<Mmap> { + let ptr = libc::mmap( + ptr::null_mut(), + len, + libc::PROT_READ, + libc::MAP_PRIVATE, + file.as_raw_fd(), + 0, + ); + if ptr == libc::MAP_FAILED { + return None; + } + Some(Mmap { ptr, len }) + } +} + +impl Deref for Mmap { + type Target = [u8]; + + fn deref(&self) -> &[u8] { + unsafe { slice::from_raw_parts(self.ptr as *const u8, self.len) } + } +} + +impl Drop for Mmap { + fn drop(&mut self) { + unsafe { + let r = libc::munmap(self.ptr, self.len); + debug_assert_eq!(r, 0); + } + } +} |