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Unified FFI setup for for readdir() on macOS (#857)

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Unified FFI setup for for readdir() on macOS.
This commit is contained in:
Victor Costan 2023-06-23 06:48:18 -07:00 committed by GitHub
parent 525ed90084
commit 0b4891fb1f
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1 changed files with 22 additions and 19 deletions
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41
src/exercises/day-3/safe-ffi-wrapper.rs
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@ -16,7 +16,7 @@
mod ffi {
use std::os::raw::{c_char, c_int};
#[cfg(not(target_os = "macos"))]
use std::os::raw::{c_long, c_ulong, c_ushort};
use std::os::raw::{c_long, c_ulong, c_ushort, c_uchar};
// Opaque type. See https://doc.rust-lang.org/nomicon/ffi.html.
#[repr(C)]
@ -25,22 +25,24 @@ mod ffi {
_marker: core::marker::PhantomData<(*mut u8, core::marker::PhantomPinned)>,
}
// Layout as per readdir(3) and definitions in /usr/include/x86_64-linux-gnu.
// Layout according to the Linux man page for readdir(3), where ino_t and
// off_t are resolved according to the definitions in
// /usr/include/x86_64-linux-gnu/{sys/types.h, bits/typesizes.h}.
#[cfg(not(target_os = "macos"))]
#[repr(C)]
pub struct dirent {
pub d_ino: c_long,
pub d_off: c_ulong,
pub d_ino: c_ulong,
pub d_off: c_long,
pub d_reclen: c_ushort,
pub d_type: c_char,
pub d_type: c_uchar,
pub d_name: [c_char; 256],
}
// Layout as per man entry for dirent
#[cfg(all(target_os = "macos", target_arch = "aarch64"))]
// Layout according to the macOS man page for dir(5).
#[cfg(all(target_os = "macos"))]
#[repr(C)]
pub struct dirent {
pub d_ino: u64,
pub d_fileno: u64,
pub d_seekoff: u64,
pub d_reclen: u16,
pub d_namlen: u16,
@ -48,20 +50,21 @@ mod ffi {
pub d_name: [c_char; 1024],
}
// Layout according to <https://github.com/rust-lang/libc/issues/414>
#[cfg(all(target_os = "macos", target_arch = "x86_64"))]
#[repr(C)]
pub struct dirent {
pub d_fileno: u32,
pub d_reclen: u16,
pub d_type: u8,
pub d_namlen: u8,
pub d_name: [c_char; 256],
}
extern "C" {
pub fn opendir(s: *const c_char) -> *mut DIR;
#[cfg(not(all(target_os = "macos", target_arch = "x86_64")))]
pub fn readdir(s: *mut DIR) -> *const dirent;
// See https://github.com/rust-lang/libc/issues/414 and the section on
// _DARWIN_FEATURE_64_BIT_INODE in the macOS man page for stat(2).
//
// "Platforms that existed before these updates were available" refers
// to macOS (as opposed to iOS / wearOS / etc.) on Intel and PowerPC.
#[cfg(all(target_os = "macos", target_arch = "x86_64"))]
#[link_name = "readdir$INODE64"]
pub fn readdir(s: *mut DIR) -> *const dirent;
pub fn closedir(s: *mut DIR) -> c_int;
}
}