Patch by Mark Roseman.

This was triggering intermittent failures in unrelated tests.

internals regarding how fds_to_pass were passed to the child.  The bug
had no actual impact as subprocess.py already avoided it.

internals regarding how fds_to_pass were passed to the child.  The bug
had no actual impact as subprocess.py already avoided it.

not allow the send_signal(), terminate(), or kill() methods to do
anything as they could potentially signal a different process.

not allow the send_signal(), terminate(), or kill() methods to do
anything as they could potentially signal a different process.

not allow the send_signal(), terminate(), or kill() methods to do
anything as they could potentially signal a different process.

STRINGLIB(find_char) and STRINGLIB(rfind_char) that can be used independedly
without special preconditions.

with a null byte.

with a null byte.

with a null byte.

Patches by Jacek Kołodziej.