Issue #10826: Prevent sporadic failure in test_subprocess on Solaris due

to open door files.

Lib/test/subprocessdata/fd_status.py

@@ -3,22 +3,22 @@ file descriptors on stdout."""
 
 import errno
 import os
-import fcntl
 
 try:
     _MAXFD = os.sysconf("SC_OPEN_MAX")
 except:
     _MAXFD = 256
 
-def isopen(fd):
-    """Return True if the fd is open, and False otherwise"""
-    try:
-        fcntl.fcntl(fd, fcntl.F_GETFD, 0)
-    except IOError as e:
-        if e.errno == errno.EBADF:
-            return False
-        raise
-    return True
-
 if __name__ == "__main__":
-    print(','.join(str(fd) for fd in range(0, _MAXFD) if isopen(fd)))
+    fds = []
+    for fd in range(0, _MAXFD):
+        try:
+            st = os.fstat(fd)
+        except OSError as e:
+            if e.errno == errno.EBADF:
+                continue
+            raise
+        # Ignore Solaris door files
+        if st.st_mode & 0xF000 != 0xd000:
+            fds.append(fd)
+    print(','.join(map(str, fds)))