Changes:

• Localization support has been much improved.
• Support open(2) flags O_CLOEXEC and O_TTY_INIT flags. Support fcntl flag F_DUPFD_CLOEXEC. Support socket flags SOCK_CLOEXEC and SOCK_NONBLOCK. Add new Linux-compatible API calls accept4, dup3, and pipe2. Support the signal SIGPWR.
• Enhanced Windows console support.
• Handle native DOS paths always as if mounted with "posix=0,noacl".
• Handle UNC paths starting with slashes identical to /cygdrive paths. In other words, use the /cygdrive mount flags for these paths as well.
• Recognize NWFS filesystem and workaround broken OS call.
• New support for eXtensible Data Record (XDR) encoding and decoding, as defined by RFCs 1014, 1832, and 4506. The XDR protocol and functions are useful for cross-platfrom data exchange, and are commonly used as the core data interchange format for Remote Procedure Call (RPC) and NFS.
• Add a few CPU flags for newer CPUs in /proc/cpuinfo.

Bugfixes:

• Fix a security problem in the execvp, execlp, exexvlp functions which erroneously allowed to start an application from the current working directory, even if that directory was not in $PATH.
• Handle file attributes for drive root directories correctly, even if the drive is inaccessible by the current user.
• Avoid incorrect results of access(2) function in some cases after switching the user context.
• Relax access permissons when opening directories via opendir() to allow successful usage of dirfd() from applications.
• Avoid overly agressive appending of .exe suffix when renaming Windows executables.
• Make cygdrive directory readable for everyone in fstat() call.
• Fix some hangs and a potential crash using pipes and FIFOs.
• Fix various problems with pthreads.
• Make sure execption handler chain is still functional after calling dlopen().
• Fix an allocation bug in regtool which made the tool mostly disfunctional.
• Fix multiple socket problems.
• Fix multiple problems in process startup.
• Fix multiple problems in setuid/seteuid.