fs::get_mode enable getting the data via fcntl/F_GETFL on major BSD

supporting this flag.

Author: devnexen

library/std/src/sys/unix/fs.rs

@@ -1260,7 +1260,14 @@ impl fmt::Debug for File {
             None
         }
 
-        #[cfg(any(target_os = "linux", target_os = "macos", target_os = "vxworks"))]
+        #[cfg(any(
+            target_os = "linux",
+            target_os = "macos",
+            target_os = "freebsd",
+            target_os = "netbsd",
+            target_os = "openbsd",
+            target_os = "vxworks"
+        ))]
         fn get_mode(fd: c_int) -> Option<(bool, bool)> {
             let mode = unsafe { libc::fcntl(fd, libc::F_GETFL) };
             if mode == -1 {
@@ -1274,7 +1281,14 @@ impl fmt::Debug for File {
             }
         }
 
-        #[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "vxworks")))]
+        #[cfg(not(any(
+            target_os = "linux",
+            target_os = "macos",
+            target_os = "freebsd",
+            target_os = "netbsd",
+            target_os = "openbsd",
+            target_os = "vxworks"
+        )))]
         fn get_mode(_fd: c_int) -> Option<(bool, bool)> {
             // FIXME(#24570): implement this for other Unix platforms
             None