newlib/winsup/cygwin/release/2.1.0

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What's new:
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- Handle pthread stacksizes as in GLibc: Default to RLIMIT_STACK resource.
Allow to set RLIMIT_STACK via setrlimit. Default RLIMIT_STACK to value
from executable header as described on
https://msdn.microsoft.com/en-us/library/windows/desktop/ms686774.aspx
Default stacksize to 2 Megs in case RLIMIT_STACK is set to RLIM_INFINITY.
- First cut of an implementation to allow signal handlers running on an
alternate signal stack.
- New API sigaltstack, plus definitions for SA_ONSTACK, SS_ONSTACK, SS_DISABLE,
MINSIGSTKSZ, SIGSTKSZ.
- New API: sethostname.
What changed:
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Bug Fixes
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- Enable non-SA_RESTART behaviour on threads other than main thread.
Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00260.html
- Try to handle concurrent close on socket more gracefully
Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00235.html
- Fix fork failing after the parent recovered from a stack overflow.
Addresses: https://cygwin.com/ml/cygwin/2015-06/msg00384.html
- Fix a crash on 64 bit XP/2003 when opening /proc/$PID/maps.
- Apparently on some Windows systems timezones differ in case
from the standard. Fix the tzset tool to check case-insensitive.
Addresses: https://cygwin.com/ml/cygwin/2015-07/msg00113.html