* Don't call the garbage collector with an exception set: it causes an
  assertion to fail in debug mode.
* Enhance also error handling if allocating an array for the executable list
  failed.
* Add an unit test for 4 different errors in the _posixsubprocess module.

when we have a way to get an actual list of all open fds from the OS.

Fixes issue #21618: The subprocess module would ignore fds that were
inherited by the calling process and already higher than POSIX resource
limits would otherwise allow.  On systems with a functioning /proc/self/fd
or /dev/fd interface the max is now ignored and all fds are closed.

Fixes issue20307.  No Misc/NEWS entry because frankly this is an
esoteric platform for anyone to be figuring out how to cross compile
CPython for.

descriptor 0, 1 or 2 is closed.
The errpipe_write fd will always be >= 3.

causing test_multiprocessing_forkserver and test_multiprocessing_spawn
failures on head (3.4).

descriptor 0, 1 or 2 is closed.

are now created non-inheritable; add functions os.get/set_inheritable(),
os.get/set_handle_inheritable() and socket.socket.get/set_inheritable().

preexec_fn callback, which may open file descriptors.

the subprocess module on Linux.

odd rare errors coming from the subprocess module.

misleading error message stating that args[0] did not exist when
either the cwd or executable keyword arguments specified a path that
did not exist.

It now keeps track of if the child got as far as preexec and reports it if
not back to the parent via a special "noexec" error message value in
the error pipe so that the cwd can be blamed for a failed chdir
instead of the exec of the executable being blamed instead.

The executable is also always reported accurately when exec fails.

Unittests enhanced to cover these cases.

It was exposed by 03c98d05b140 and dbbf3ccf72e8.

Patch by Serhiy Storchaka.

Based on patch from Hervé Coatanhay.

Based on patch from Hervé Coatanhay.

"oops" while rearranging the #defines.

Many lack readdir64, use readdir.  Only use readdir64 on solaris where
it is required to work around a solaris bug.

suboptimal by closing all possible file descriptors rather than just
the open ones in the child process before exec().

It now closes only the open fds when it is possible to safely determine what
those are.

Thanks to Konrad Schöbel and Jasper Schulz for helping with the mass-editing.

given as a low fd, it gets overwritten.

in the _posixsubprocess C extension module it would unintentionally close the fds and raise
an error.

in the _posixsubprocess C extension module it would unintentionally close the fds and raise
an error.

file descriptors (0, 1, 2) are closed in the parent process.  Initial
patch by Ross Lagerwall.

Issue #7213: Change the close_fds default on Windows to better match the new
default on POSIX.  True when possible (False if stdin/stdout/stderr are
supplied).

Update the documentation to reflect all of the above.

the C code, using pipe2() when available.  Adds unittests for close_fds and
cloexec behaviors.

to list exactly which file descriptors should be kept open.

you have to convert your bytearray filenames to bytes