Convert more Pal methods to Result.

src/header/sys_stat/mod.rs

@@ -110,19 +110,19 @@ pub unsafe extern "C" fn lstat(path: *const c_char, buf: *mut stat) -> c_int {
 #[no_mangle]
 pub unsafe extern "C" fn mkdir(path: *const c_char, mode: mode_t) -> c_int {
     let path = CStr::from_ptr(path);
-    Sys::mkdir(path, mode)
+    Sys::mkdir(path, mode).map(|()| 0).or_minus_one_errno()
 }
 
 #[no_mangle]
 pub unsafe extern "C" fn mkfifo(path: *const c_char, mode: mode_t) -> c_int {
     let path = CStr::from_ptr(path);
-    Sys::mkfifo(path, mode)
+    Sys::mkfifo(path, mode).map(|()| 0).or_minus_one_errno()
 }
 
 #[no_mangle]
 pub unsafe extern "C" fn mknod(path: *const c_char, mode: mode_t, dev: dev_t) -> c_int {
     let path = CStr::from_ptr(path);
-    Sys::mknod(path, mode, dev)
+    Sys::mknod(path, mode, dev).map(|()| 0).or_minus_one_errno()
 }
 
 #[no_mangle]
@@ -134,6 +134,8 @@ pub unsafe extern "C" fn mknodat(
 ) -> c_int {
     let path = CStr::from_ptr(path);
     Sys::mknodat(dirfd, path, mode, dev)
+        .map(|()| 0)
+        .or_minus_one_errno()
 }
 
 #[no_mangle]