Expose mknodat/mkfifoat on Apple targets

src/backend/libc/fs/syscalls.rs

@@ -52,7 +52,6 @@ use crate::fs::StatFs;
 #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
 use crate::fs::Timestamps;
 #[cfg(not(any(
-    apple,
     target_os = "espidf",
     target_os = "redox",
     target_os = "vita",
@@ -1196,7 +1195,6 @@ pub(crate) fn chownat(
 }
 
 #[cfg(not(any(
-    apple,
     target_os = "espidf",
     target_os = "horizon",
     target_os = "redox",
@@ -1210,13 +1208,30 @@ pub(crate) fn mknodat(
     mode: Mode,
     dev: Dev,
 ) -> io::Result<()> {
+    let mode = (mode.bits() | file_type.as_raw_mode()) as c::mode_t;
+    let dev = dev.try_into().map_err(|_e| io::Errno::PERM)?;
+
+    // Older Apple platforms lack `mknodat`.
+    #[cfg(apple)]
     unsafe {
-        ret(c::mknodat(
-            borrowed_fd(dirfd),
-            c_str(path),
-            (mode.bits() | file_type.as_raw_mode()) as c::mode_t,
-            dev.try_into().map_err(|_e| io::Errno::PERM)?,
-        ))
+        weak! {
+            fn mknodat(
+                c::c_int,
+                *const ffi::c_char,
+                c::mode_t,
+                c::dev_t
+            ) -> c::c_int
+        }
+        // If we have `mknodat`, use it.
+        if let Some(libc_mknodat) = mknodat.get() {
+            return ret(libc_mknodat(borrowed_fd(dirfd), c_str(path), mode, dev));
+        }
+        Err(io::Errno::NOSYS)
+    }
+
+    #[cfg(not(apple))]
+    unsafe {
+        ret(c::mknodat(borrowed_fd(dirfd), c_str(path), mode, dev))
     }
 }
 

src/fs/at.rs

@@ -20,7 +20,7 @@ use crate::fs::CloneFlags;
 use crate::fs::RenameFlags;
 #[cfg(not(target_os = "espidf"))]
 use crate::fs::Stat;
-#[cfg(not(any(apple, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
 use crate::fs::{Dev, FileType};
 #[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
 use crate::fs::{Gid, Uid};
@@ -460,11 +460,12 @@ pub fn fclonefileat<Fd: AsFd, DstFd: AsFd, P: path::Arg>(
 /// # References
 ///  - [POSIX]
 ///  - [Linux]
+///  - [Apple]
 ///
 /// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/mknodat.html
 /// [Linux]: https://man7.org/linux/man-pages/man2/mknodat.2.html
+/// [Apple]: https://github.com/apple-oss-distributions/xnu/blob/main/bsd/man/man2/mknodat.2
 #[cfg(not(any(
-    apple,
     target_os = "espidf",
     target_os = "horizon",
     target_os = "vita",
@@ -488,10 +489,11 @@ pub fn mknodat<P: path::Arg, Fd: AsFd>(
 ///
 /// # References
 ///  - [POSIX]
+///  - [Apple]
 ///
 /// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/mkfifoat.html
+/// [Apple]: https://github.com/apple-oss-distributions/xnu/blob/main/bsd/man/man2/mkfifoat.2
 #[cfg(not(any(
-    apple,
     target_os = "espidf",
     target_os = "horizon",
     target_os = "vita",