now register both filenames in the exception on failure.
This required adding new C API functions allowing OSError exceptions
to reference two filenames instead of one.

error instead of returning -1.

Use also os.get_inheritable() instead of fcntl() to check the inheritable flag
(FD_CLOEXEC).

Do we need a fallback implementation of getcwd() from 1991 that claims to
support "really old Unix systems"? I don't think so.

deployment target prior to 10.6.

deployment target prior to 10.6.

when result of PyLong_AsLong() narrowed to int without checks.

sched_setscheduler() can fail with EINVAL if the process scheduling policy is
neither SCHED_FIFO nor SCHED_RR.

sched_setscheduler() can fail with EINVAL if the process scheduling policy is
neither SCHED_FIFO nor SCHED_RR.

file descriptor receive the incorrect type.

gives the same output as "id -G".

This is necessary for ZFS systems, which don't support UF_IMMUTABLE.
--
Kubilay Kocak (koobs) asked me on IRC to backport this fix to Python 2.7: done!

Patch from Serhiy Storchaka.

This is done by extending a previous fix for issue #9185 that was made for
Solaris and OpenBSD to NetBSD as well.

This is necessary for ZFS systems, which don't support UF_IMMUTABLE.

(Note: this commit is a manual merge of 78699:019a2390b014 as both
_test_chflags_regular_file and test_lchflags_symlink differ between
3.2 and default.)

This is necessary for ZFS systems, which don't support UF_IMMUTABLE.

os.sched_setaffinity now use regular sets of integers to represent the
CPUs a process is restricted to.

Skip test in freebsd entirely - Kernel bug in freebsd7/8/9 - #10142: Support for SEEK_HOLE/SEEK_DATA

of os.listdir().