newlib-cygwin/winsup/cygwin/release/1.7.33

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What's new:
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- Introduce reading passwd/group entries directly from SAM/AD, thus allowing
to do without /etc/passwd and /etc/group files. Introduce /etc/nsswitch.conf
file to configure passwd/group handling.
- /proc/cygdrive as a symlink pointing to the current cygdrive prefix. This
can be utilized in scripts to access paths via cygdrive prefix, even if the
cygdrive prefix has been changed by the user.
- Extend /proc/partitions to print the windows mount points the device is
mounted on. This allows to recognize the underlying Windows devices of the
Cygwin raw device names.
- New API: quotactl, designed after the Linux/BSD function, but severly
restricted: Windows only supports user block quotas on NTFS, no group
quotas, no inode quotas, no time constraints.
- New APIs: ffsl, ffsll.
What changed:
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Bug Fixes
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- Don't hang in accept calls if socket is no listener. Set errno to EINVAL
instead. Don't hang in read/recv/recvfrom/recvmsg calls if socket is
connection oriented and not connected. Set errno to ENOTCONN instead.
- Don't claim serial line is a tty. Don't allow seeking on serial lines and
sockets. Set errno to ESPIPE instead.
Addresses: https://cygwin.com/ml/cygwin/2014-08/msg00319.html