Index: Misc/ACKS
===================================================================
--- Misc/ACKS	(revision 87629)
+++ Misc/ACKS	(working copy)
@@ -131,6 +131,7 @@
 Daniel Calvelo
 Tony Campbell
 Brett Cannon
+Justin Cappos
 Mike Carlton
 Terry Carroll
 Lorenzo M. Catucci
Index: Misc/NEWS
===================================================================
--- Misc/NEWS	(revision 87629)
+++ Misc/NEWS	(working copy)
@@ -20,6 +20,10 @@
 Library
 -------
 
+- Issue #7995: Fix on Unix systems except Linux that the socket
+  returned from socket.accept() must not inherit the listening socket's file
+  status flags. Patch by Ross Lagerwall.
+
 - Issue #10801: In zipfile, support different encodings for the header and
   the filenames.
 
Index: Lib/test/test_socket.py
===================================================================
--- Lib/test/test_socket.py	(revision 87629)
+++ Lib/test/test_socket.py	(working copy)
@@ -976,6 +976,21 @@
         def _testInitNonBlocking(self):
             pass
 
+    def testInheritFlags(self):
+        self.serv.settimeout(10)
+        try:
+            conn, addr = self.serv.accept()
+            message = conn.recv(len(MSG))
+        finally:
+            conn.close()
+            self.serv.settimeout(None)
+
+    def _testInheritFlags(self):
+        time.sleep(0.1)
+        self.cli.connect((HOST, self.port))
+        time.sleep(0.5)
+        self.cli.send(MSG)
+
     def testAccept(self):
         # Testing non-blocking accept
         self.serv.setblocking(0)
Index: Modules/socketmodule.c
===================================================================
--- Modules/socketmodule.c	(revision 87629)
+++ Modules/socketmodule.c	(working copy)
@@ -1700,6 +1700,13 @@
     if (newfd == INVALID_SOCKET)
         return s->errorhandler();
 
+#if defined(HAVE_FCNTL_H) && defined(O_NONBLOCK) && !defined(__Linux__)
+    /* Try unset O_NONBLOCK if it's inherited. */
+    int st_flag = fcntl(newfd, F_GETFL, 0);
+    if (st_flag != -1)
+        fcntl(newfd, F_SETFL, st_flag & ~O_NONBLOCK);
+#endif
+
     sock = PyLong_FromSocket_t(newfd);
     if (sock == NULL) {
         SOCKETCLOSE(newfd);