newlib/winsup/cygwin/release/1.7.33

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What's new:
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- /proc/cygdrive is a new 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.
- /proc/partitions now prints 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 severely
restricted: Windows only supports user block quotas on NTFS, no group
quotas, no inode quotas, no time constraints.
- New APIs: ffsl, ffsll (glibc extensions).
- New API: stime (SVr4).
What changed:
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- New internal exception handling based on SEH on 64 bit Cygwin.
- When exec'ing applications, check if $PATH exists and is non-empty. If not,
add PATH variable with Cygwin installation directory as content to Windows
environment to allow loading of Cygwin system DLLs.
- Disable CYGWIN "dosfilewarning" option by default.
- Improve various header files for C++- and standards-compliance.
- Doug Lea malloc implementation update from 2.8.3 to the latest 2.8.6.
- atexit is now exported as statically linked function from libcygwin.a.
This allows reliable access to the DSO handle of the caller for newly
built executables. The former atexit entry point into the DLL remains
for backward compatibility only.
Bug Fixes
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- Per POSIX, dirfd(3) now returns EINVAL rather than EBADF on invalid
directory stream.
- Fix a resource leak in rmdir(2).
- Fix fchmod(2)/fchown(2)/fsetxattr(2) in case the file got renamed after
open and before calling one of the affected functions.
Addresses: https://cygwin.com/ml/cygwin/2014-08/msg00517.html
- Handle Netapp-specific problem in statvfs(2)/fstatvfs(2).
Addresses: https://cygwin.com/ml/cygwin/2014-06/msg00425.html
- Fix chown(2) on ptys in a corner case.
- Generate correct error when a path is inaccessible due to missing permissions.
Addresses: https://cygwin.com/ml/cygwin-developers/2014-10/msg00010.html
- Don't hang in accept calls if socket is no listener. Set errno to EINVAL
instead.
- Don't allow seeking on serial lines and sockets. Set errno to ESPIPE
instead.
Addresses: https://cygwin.com/ml/cygwin/2014-08/msg00319.html
- Fix output of /proc/<PID>/statm.
- Fix a SEGV in cygcheck if the environment variable COMSPEC is not, or
incorrectly set.
Addresses: https://cygwin.com/ml/cygwin/2014-10/msg00292.html
- Fix a SEGV in some 64 bit applications explicitely dlclosing DLLs.
Addresses: https://cygwin.com/ml/cygwin/2014-10/msg00402.html
- Fix -fuse-cxa-atexit handling where dlclose fails to trigger calling
global dtors in dynamically loaded modules in C++ applications (and
thus another potential SEGV).