From 8cb64eaaf38aecea67901dc4ecb2149805356a99 Mon Sep 17 00:00:00 2001
From: Gustavo Niemeyer <gustavo@niemeyer.net>
Date: Wed, 6 Sep 2006 01:58:52 +0000
Subject: Fixing #1531862: Do not close standard file descriptors in the
 subprocess module.

---
 Lib/subprocess.py           | 12 ++++--------
 Lib/test/test_subprocess.py | 42 ++++++++++++++++++++++++++++++++++++++++++
 Misc/NEWS                   |  2 ++
 3 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 5438f15..7c229dc 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -1000,14 +1000,10 @@ class Popen(object):
                     if errwrite:
                         os.dup2(errwrite, 2)
 
-                    # Close pipe fds.  Make sure we doesn't close the same
-                    # fd more than once.
-                    if p2cread:
-                        os.close(p2cread)
-                    if c2pwrite and c2pwrite not in (p2cread,):
-                        os.close(c2pwrite)
-                    if errwrite and errwrite not in (p2cread, c2pwrite):
-                        os.close(errwrite)
+                    # Close pipe fds.  Make sure we don't close the same
+                    # fd more than once, or standard fds.
+                    for fd in set((p2cread, c2pwrite, errwrite))-set((0,1,2)):
+                        if fd: os.close(fd)
 
                     # Close all other fds, if asked for
                     if close_fds:
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index 8c8ac40..62b1e75 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -234,6 +234,48 @@ class ProcessTestCase(unittest.TestCase):
         stripped = remove_stderr_debug_decorations(output)
         self.assertEqual(stripped, "appleorange")
 
+    def test_stdout_filedes_of_stdout(self):
+        # stdout is set to sys.stdout.fileno() (#1531862).
+        cmd = r"import sys, os; sys.exit(os.write(sys.stderr.fileno(), '.\n'))"
+        rc = subprocess.call([sys.executable, "-c", cmd],
+                             stdout=sys.stdout.fileno())
+        self.assertEquals(rc, 2)
+
+    def test_stdout_fileobj_of_stdout(self):
+        # stdout is set to sys.stdout (#1531862).
+        cmd = r"import sys, os; sys.exit(os.write(sys.stderr.fileno(), '.\n'))"
+        rc = subprocess.call([sys.executable, "-c", cmd],
+                             stdout=sys.stdout)
+        self.assertEquals(rc, 2)
+
+    def test_stdout_fileobj_of_stderr(self):
+        # stdout is set to sys.stderr (#1531862).
+        cmd = r"import sys, os; sys.exit(os.write(sys.stderr.fileno(), '.\n'))"
+        rc = subprocess.call([sys.executable, "-c", cmd],
+                             stdout=sys.stderr)
+        self.assertEquals(rc, 2)
+
+    def test_stderr_filedes_of_stderr(self):
+        # stderr is set to sys.stderr.fileno() (#1531862).
+        cmd = r"import sys, os; sys.exit(os.write(sys.stderr.fileno(), '.\n'))"
+        rc = subprocess.call([sys.executable, "-c", cmd],
+                             stderr=sys.stderr.fileno())
+        self.assertEquals(rc, 2)
+
+    def test_stderr_fileobj_of_stderr(self):
+        # stderr is set to sys.stderr (#1531862).
+        cmd = r"import sys, os; sys.exit(os.write(sys.stderr.fileno(), '.\n'))"
+        rc = subprocess.call([sys.executable, "-c", cmd],
+                             stderr=sys.stderr)
+        self.assertEquals(rc, 2)
+
+    def test_stderr_fileobj_of_stdout(self):
+        # stderr is set to sys.stdout (#1531862).
+        cmd = r"import sys, os; sys.exit(os.write(sys.stderr.fileno(), '.\n'))"
+        rc = subprocess.call([sys.executable, "-c", cmd],
+                             stderr=sys.stdout)
+        self.assertEquals(rc, 2)
+
     def test_cwd(self):
         tmpdir = os.getenv("TEMP", "/tmp")
         # We cannot use os.path.realpath to canonicalize the path,
diff --git a/Misc/NEWS b/Misc/NEWS
index c0649ae..2571769 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -37,6 +37,8 @@ Library
 - Bug #1541863: uuid.uuid1 failed to generate unique identifiers
   on systems with low clock resolution.
 
+- Bug #1531862: Do not close standard file descriptors in subprocess.
+
 
 Extension Modules
 -----------------
-- 
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