newlib/winsup/cygwin/release/2.5.0

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What's new:
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- First implementation of pthread_barrier/pthread_barrierattr functions.
New APIs: pthread_barrierattr_init, pthread_barrierattr_setpshared,
pthread_barrierattr_getpshared, pthread_barrierattr_destroy,
pthread_barrier_init, pthread_barrier_destroy, pthread_barrier_wait.
What changed:
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- In calls to chmod treat ACLs with extra ACEs *only* for Admins and
SYSTEM like a trivial ACL.
- Bump POSIX option macros to POSIX.1-2008.
Bug Fixes
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- Fix potential hang when using LoadLibraryEx(LOAD_LIBRARY_SEARCH_SYSTEM32).
Reported and tested via IRC.
- Fix a bug in ACL handling which might result in a spurious extra entry
for the primary group. Self-observed.
- printf(3): Handle multibyte decimal point in field size computation.
Addresses: https://cygwin.com/ml/cygwin/2016-02/msg00014.html
- cygwin_conv_path: Always preserve trailing backslashes in conversion
to POSIX paths.
Addresses: https://cygwin.com/ml/cygwin/2016-01/msg00480.html
- Make buffered console characters visible to select().
Addresses: https://cygwin.com/ml/cygwin/2014-12/msg00118.html
- Always report relocation problems, not only in debug DLL.
Addresses: https://cygwin.com/ml/cygwin/2016-02/msg00147.html
- Don't spill network credentials of privileged user changing the user
context via setuid method 1
(https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-nopasswd1) into
user session