fcntl adding few apple extensions (#2155)

Author: devnexen

changelog/2155.added.md

@@ -0,0 +1,2 @@
+Added `F_GETPATH_NOFIRMLINK` and `F_BARRIERFSYNC` FcntlFlags entry
+on Apple for `::nix::fcntl`.

src/fcntl.rs

@@ -504,6 +504,8 @@ pub enum FcntlArg<'a> {
     F_GET_SEALS,
     #[cfg(any(target_os = "macos", target_os = "ios"))]
     F_FULLFSYNC,
+    #[cfg(any(target_os = "macos", target_os = "ios"))]
+    F_BARRIERFSYNC,
     #[cfg(any(target_os = "linux", target_os = "android"))]
     F_GETPIPE_SZ,
     #[cfg(any(target_os = "linux", target_os = "android"))]
@@ -512,6 +514,8 @@ pub enum FcntlArg<'a> {
     F_GETPATH(&'a mut PathBuf),
     #[cfg(all(target_os = "freebsd", target_arch = "x86_64"))]
     F_KINFO(&'a mut PathBuf),
+    #[cfg(any(target_os = "macos", target_os = "ios"))]
+    F_GETPATH_NOFIRMLINK(&'a mut PathBuf),
     // TODO: Rest of flags
 }
 
@@ -568,6 +572,8 @@ pub fn fcntl(fd: RawFd, arg: FcntlArg) -> Result<c_int> {
             F_GET_SEALS => libc::fcntl(fd, libc::F_GET_SEALS),
             #[cfg(any(target_os = "macos", target_os = "ios"))]
             F_FULLFSYNC => libc::fcntl(fd, libc::F_FULLFSYNC),
+            #[cfg(any(target_os = "macos", target_os = "ios"))]
+            F_BARRIERFSYNC => libc::fcntl(fd, libc::F_BARRIERFSYNC),
             #[cfg(any(target_os = "linux", target_os = "android"))]
             F_GETPIPE_SZ => libc::fcntl(fd, libc::F_GETPIPE_SZ),
             #[cfg(any(target_os = "linux", target_os = "android"))]
@@ -593,6 +599,15 @@ pub fn fcntl(fd: RawFd, arg: FcntlArg) -> Result<c_int> {
                 *path = PathBuf::from(OsString::from(optr.to_str().unwrap()));
                 return Ok(ok_res)
             },
+            #[cfg(any(target_os = "macos", target_os = "ios"))]
+            F_GETPATH_NOFIRMLINK(path) => {
+                let mut buffer = vec![0; libc::PATH_MAX as usize];
+                let res = libc::fcntl(fd, libc::F_GETPATH_NOFIRMLINK, buffer.as_mut_ptr());
+                let ok_res = Errno::result(res)?;
+                let optr = CStr::from_bytes_until_nul(&buffer).unwrap();
+                *path = PathBuf::from(OsString::from(optr.to_str().unwrap()));
+                return Ok(ok_res)
+            },
         }
     };
 

test/test_fcntl.rs

@@ -585,6 +585,38 @@ fn test_f_get_path() {
     );
 }
 
+#[cfg(any(target_os = "macos", target_os = "ios"))]
+#[test]
+fn test_f_get_path_nofirmlink() {
+    use nix::fcntl::*;
+    use std::{os::unix::io::AsRawFd, path::PathBuf};
+
+    let tmp = NamedTempFile::new().unwrap();
+    let fd = tmp.as_raw_fd();
+    let mut path = PathBuf::new();
+    let res = fcntl(fd, FcntlArg::F_GETPATH_NOFIRMLINK(&mut path))
+        .expect("get path failed");
+    let mut tmpstr = String::from("/System/Volumes/Data");
+    tmpstr.push_str(
+        &tmp.path()
+            .canonicalize()
+            .unwrap()
+            .into_os_string()
+            .into_string()
+            .unwrap(),
+    );
+    assert_ne!(res, -1);
+    assert_eq!(
+        path.as_path()
+            .canonicalize()
+            .unwrap()
+            .into_os_string()
+            .into_string()
+            .unwrap(),
+        tmpstr
+    );
+}
+
 #[cfg(all(target_os = "freebsd", target_arch = "x86_64"))]
 #[test]
 fn test_f_kinfo() {