Index: subprocess.py
===================================================================
--- subprocess.py	(revision 77683)
+++ subprocess.py	(working copy)
@@ -948,7 +948,11 @@
 
             if self.stdin:
                 if input is not None:
-                    self.stdin.write(input)
+                    try:
+                        self.stdin.write(input)
+                    except (IOError, OSError), e:
+                        if e.errno != errno.EPIPE:
+                            raise
                 self.stdin.close()
 
             if self.stdout:
@@ -1292,7 +1296,12 @@
                 for fd, mode in ready:
                     if mode & select.POLLOUT:
                         chunk = input[input_offset : input_offset + _PIPE_BUF]
-                        input_offset += os.write(fd, chunk)
+                        try:
+                            input_offset += os.write(fd, chunk)
+                        except (IOError, OSError), e:
+                            if e.errno != errno.EPIPE:
+                                raise
+                            input_offset = len(input)
                         if input_offset >= len(input):
                             close_unregister_and_remove(fd)
                     elif mode & select_POLLIN_POLLPRI: