Issue #18571: Merge duplicate test code

Merge test/subprocessdata/inherited.py into test/subprocessdata/fd_status.py

Lib/test/subprocessdata/fd_status.py

@@ -1,18 +1,27 @@
 """When called as a script, print a comma-separated list of the open
-file descriptors on stdout."""
+file descriptors on stdout.
+
+Usage:
+fd_stats.py: check all file descriptors
+fd_status.py fd1 fd2 ...: check only specified file descriptors
+"""
 
 import errno
 import os
 import stat
-
-try:
-    _MAXFD = os.sysconf("SC_OPEN_MAX")
-except:
-    _MAXFD = 256
+import sys
 
 if __name__ == "__main__":
     fds = []
-    for fd in range(0, _MAXFD):
+    if len(sys.argv) == 1:
+        try:
+            _MAXFD = os.sysconf("SC_OPEN_MAX")
+        except:
+            _MAXFD = 256
+        test_fds = range(0, _MAXFD)
+    else:
+        test_fds = map(int, sys.argv[1:])
+    for fd in test_fds:
         try:
             st = os.fstat(fd)
         except OSError as e: