fixup! Rework tail plateform module to tackle uutils#2873

src/uu/tail/src/platform/unix.rs

@@ -8,7 +8,7 @@
  * file that was distributed with this source code.
  */
 
-// spell-checker:ignore (ToDO) stdlib
+// spell-checker:ignore (ToDO) stdlib, ISCHR,ISREG,ISFIFO
 // spell-checker:ignore (options) GETFD EPERM ENOSYS
 
 use std::io::{stdin, Error};
@@ -17,7 +17,7 @@ use std::os::unix::prelude::AsRawFd;
 
 use nix::sys::stat::fstat;
 
-use libc::{S_IFIFO, S_IFSOCK};
+use libc::{S_IFIFO, S_IFREG, S_IFSOCK};
 
 pub type Pid = libc::pid_t;
 
@@ -58,7 +58,9 @@ pub fn stdin_is_pipe_or_fifo() -> bool {
             Ok(stat) => {
                 let mode = stat.st_mode as libc::mode_t;
                 // NOTE: This is probably not the most correct way to check this
-                (mode & S_IFIFO != 0) || (mode & S_IFSOCK != 0)
+                (mode & S_IFIFO != 0)
+                    || ((cfg!(target_os = "macos")) && (mode & S_IFSOCK != 0))
+                    || (!(cfg!(target_os = "macos")) && (mode & S_IFREG != 0))
             }
             Err(err) => panic!("{}", err),
         }