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[ANNOUNCEMENT] Public Cygwin 1.7 test starts today

Hi all,

after a rather long period of time of development, we're proud to start
public testing of the upcoming new major release of Cygwin.  The version
number is 1.7.0 for the current test release and will be 1.7.x with some
x yet to be chosen for the final release.  As of today, the planning is
to release the final release at some point in Spring 2009.

This new release will bring quite a few changes, some of them might
require to do accompanying changes in your environment.  The most
intrusive changes are

- No more support for Windows 95/98/Me.  Cygwin 1.7 will not run on any
  of these systems.  We will keep the old 1.5.25 distro on sourceware
  for users of these obsolete Windows versions.

- No more mount points in the registry.  Use a file /etc/fstab instead.

- Some global $CYGWIN options have been dropped, some of them have been
  converted to mount options.

- No more managed mounts.  The implementation for POSIX pathnames
  colliding with forbidden filenames and characters on Windows
  filesystems has changed considerably.

At the end of this mail you will find a more or less complete list of
changes from 1.5.x to 1.7.x.  During the testing phase for this release
we don't expect any behavioural change from the current state except
some behaviour turns out to be unfeasible or is plain buggy.  A few (but
only a few) more features may be included within the test phase, namely
support for wide-char stdio routines, which is work in progess.

One interesting feature for the testers is the fact that you can install
Cygwin 1.7 in parallel to another production 1.5 installation.  They
don't interact with each other, provided you start the processes in
separate Windows, and you *don't* have *both* Cygwin binary paths in the
$PATH variable.  This is unsupported territory.

However, if you want to install services using the service installer
scripts around (inetd-config, ssh-host-config, etc), then keep in mind
that the scripts try to install the services under the same service name
as the former 1.5 script.  Additionally, network related services will
of course try to use the same network port numbers to install themselves
as service.  Bottom line:  If you want to test services, make sure you
have the related 1.5-based services *stopped* before running the same
services in the 1.7 realm.

I would like to stress that this is a *test* release.  Don't use it in a
crucial production environment.  Don't use it for you important personal
or work environment without making sure that you won't suffer loss of
life or money if something goes wrong by using this Cygwin 1.7 test
release.  There's no guarantee that we didn't screw something up

If you have more than one physical or virtual Windows machine, it's the
best to install the test release on the machine you don't need for the
production Cygwin install.

Last but not least, please 

- *read* the below list of changes for a start, so you know what we're
  threatening you with,

- *read* the new User's Guide, which you can access via
  or (one single big file)

  Though it's probably still lacking, it will explain a lot of the new
  behaviour in (hopefully) better words than the old User's Guide.

  Please note that we have no new FAQ.  The reason is simply that
  we don't know yet what questions will be asked frequently in future.

- After having digested the docs, ask yourself if you're willing to
  help testing the next Cygwin release.  If your heart and brain both
  say "yes", then use

  to install the test release. Note that it will default to *upgrading*
  an existing installation!  If you don't want that (and I bet you
  won't), make sure to change the installation directory right in the
  second dialog from your old, say, C:/cygwin to, say, C:/cygwin-1.7.

  Note that this setup-1.7.exe tool also has some changes related to the
  1.5 version.  The most noticable is that it is slower than the old
  one.  The reason is that it tries hard to create the files and
  directories with POSIX-like permissions as given in the distribution

  Additionally, note that setup-1.7.exe will notice that your Cygwin
  desktop shortcut (if you have one) already exists.  It will not try
  to create a new one in this case, and the Cygwin shortcut will still
  point to the 1.5 installation.  To get a matching 1.7 shortcut, just
  copy your existing shortcut, rename it to, for instance, Cygwin-1.7,
  and change the shortcut target path from the 1.5 distro directory to
  the 1.7 distro directory.

Did I mention that this is a *test* release and that you should make
sure that you don't screw up your existing Cygwin installation unless
you really want to?

Thanks for reading and especially thanks for participating.  I'm quite
nervous given the many many changes in 1.7, but if we live through the
next few months, I'm sure that this new Cygwin is the best Cygwin we
ever had.  (ob-joke for insider:  Except of b20, of course).

Please report bugs to the mailing list  The usual
bug reporting guidelines apply:

Ok, below you'll find the list of changes since 1.5.25.

Have fun,

                         LIST OF CHANGES

OS releated changes:

- Windows 95, 98 and Me are not supported anymore.  The new DLL will
  not run on any of these systems.

File Access related changes:

- Mount points are no longer stored in the registry.  Use /etc/fstab
  and /etc/fstab.d/$USER instead.  Mount points created with mount(1)
  are only local to the current session and disappear when the last
  Cygwin process in the session exits.

- PATH_MAX is now 4096.  Internally, path names can be as long as the
  underlying OS can handle (32K).
- UTF-8 filenames are supported now.  So far, this requires to set
  the environment variable CYGWIN to contain "codepage:utf8". but this
  will likely disappear at one point.  The setting of $LANG or $LC_CTYPE
  will be used instead.

- struct dirent now supports d_type, filled out with DT_REG or DT_DIR.
  All other file types return as DT_UNKNOWN for performance reasons.

- The CYGWIN environment variable options "ntsec" and "smbntsec" have
  been replaced by the per-mount option "acl"/"noacl".

- The CYGWIN environment variable option "ntea" has been removed without

- The CYGWIN environment variable option "check_case" has been removed
  in favor of real case-sensitivity on file systems supporting it.

- Creating filenames with special DOS characters '"', '*', ':', '<',
  '>', '|' is supported.

- Creating files with special DOS device filename components ("aux",
  "nul", "prn") is supported.

- File name are case sensitive if the OS and the underlying file system
  supports it.  Works on NTFS and NFS.  Does not work on FAT and Samba
  shares.  Requires to change a registry key (see the user's guide).
  Can be switched off on a per-mount base.

- Due to the above changes, managed mounts have been removed. 

- unlink(2) and rmdir(2) try very hard to remove files/directories even
  if they are currently accessed or locked.  This is done by utilizing
  the hidden recycle bin directories and marking the files for deletion.

- rename(2) rewritten to be more POSIX conformant.

- Add st_birthtim member to struct stat.

- File locking is now advisory, not mandatory anymore.  The fcntl(2) and
  the new lockf(2) APIs create and maintain locks with POSIX semantics,
  the flock(2) API creates and maintains locks with BSD semantics.
  POSIX and BSD locks are independent of each other.

- Implement atomic O_APPEND mode.

- Handle NTFS native symlinks available since Vista/2008 as symlinks
  (but don't create Vista/2008 symlinks due to unfortunate OS restrictions).

- Recognize NFS shares and handle them using native mechanisms.
  Recognize and create real symlinks on NFS shares.  Get correct
  stat(2) information and set real mode bits on open(2), mkdir(2)
  and chmod(2).

- Recognize Netapp DataOnTap drives and fix inode number handling.

- Recognize Samba version beginning with Samba 3.0.28a using the new
  extended version information negotiated with the Samba developers.

- List servers of all accessible domains and workgroups in // instead of
  just the servers in the own domain/workgroup.

- Support Linux-like extended attributes ([fl]getxattr, [fl]listxattr,
  [fl]setxattr, [fl]removexattr).

- New file conversion API for conversion from Win32 to POSIX path and
  vice versa (cygwin_conv_path, cygwin_create_path, cygwin_conv_path_list).

- New openat family of functions: openat, faccessat, fchmodat, fchownat,
  fstatat, futimesat, linkat, mkdirat, mkfifoat, mknodat, readlinkat, renameat,
  symlinkat, unlinkat.

- Other new APIs: posix_fadvise, posix_fallocate, funopen, fopencookie,
  open_memstream, fmemopen, fdopendir.

Network related changes:

- New implementation for blocking sockets and select on sockets which
  is supposed to allow POSIX-compatible sharing of sockets between
  threads and processes.

- send/sendto/sendmsg now send data in 64K chunks to circumvent an
  internal buffer problem in WinSock (KB 201213).

- IPv6 support.  New API getaddrinfo, getnameinfo, freeaddrinfo,
  gai_strerror, in6addr_any, in6addr_loopback.  On IPv6-less systems,
  replacement functions are available for IPv4.  On systems with IPv6
  enabled, the underlying WinSock functions are used.  While I tried
  hard to get the functionality as POSIXy as possible, keep in mind that
  a *fully* conformant implementation of getaddrinfo and other stuff is
  only available starting with Windows Vista/2008.

- Resolver functions (res_init, res_query, res_search, res_querydomain,
  res_mkquery, res_send, dn_comp, dn_expand) are now part of Cygwin.
  Applications don't have to link against minires anymore.  Actually,
  this *is* the former libminires.a.

- rcmd is now implemented inside of Cygwin, instead of calling the
  WinSock function.  This allows rsh(1) usage on Vista/2008, which
  dropped this function from WinSock.

- Define multicast structures in netinet/in.h.  Note that fully
  conformant multicast support is only available beginning with Vista/2008.

- Improve get_ifconf.  Redefine struct ifreq and subsequent datastructures
  to be able to keep more information.  Support SIOCGIFINDEX, SIOCGIFDSTADDR
  and the Cygwin specific SIOCGIFFRNDLYNAM.  Support real interface flags
  on systems supporting them.

- Other new APIs: bindresvport, bindresvport_sa, iruserok_sa, rcmd_af,
  rresvport_af.  getifaddrs, freeifaddrs, if_nametoindex, if_indextoname,
  if_nameindex, if_freenameindex.

- Add /proc/net/if_inet6.

Device related changes:

- Reworked pipe implementation which uses overlapped IO to create
  more reliable interruptible pipes and fifos.

- The CYGWIN environment variable option "binmode" has been removed.

- Improved fifo handling by using native Windows named pipes.

- Detect when a stdin/stdout which looks like a pipe is really a tty.
  Among other things, this allows a debugged application to recognize that
  it is using the same tty as the debugger.

- Support UTF-8 in console window.

- Support up to 64 serial interfaces using /dev/ttyS0 - /dev/ttyS63.

- Support up to 128 raw disk drives /dev/sda - /dev/sddx.

- New API: posix_openpt.

Other POSIX related changes:

- Implement pthread_kill(thread, 0) as per POSIX.

- New API for POSIX IPC:
  Named semaphores: sem_open, sem_close, sem_unlink.
  Message queues: mq_open, mq_getattr, mq_setattr, mq_notify, mq_send,
  mq_timedsend, mq_receive, mq_timedreceive, mq_close, mq_unlink.
  Shared memory: shm_open, shm_unlink.

- Only declare expected functions in <strings.h>, don't include <string.h>
  from here.

- New APIs: asnprintf, dprintf, _Exit, vasnprintf, vdprintf, confstr,
  posix_madvise, posix_memalign, exp10, exp10f, pow10, pow10f, lrint,
  lrintf, rint, rintf, llrint, llrintf, llrintl, lrintl, rintl insque,
  remque, sys_sigabbrev, strcasestr, stpcpy, stpncpy, wcpcpy, wcpncpy,
  wcstol, wcstoll, wcstoul, wcstoull, wcsxfrm.

Security related changes:

- Getting a domain user's groups is hopefully more bulletproof now.

- Cygwin now comes with a real LSA authentication package.  This must
  be manually installed by a privileged user using the /bin/cyglsa-config
  script.  The advantages and disadvantages are noted in

- Cygwin now allows to store and use user passwords in a hidden area of
  the registry.  This is tried first when Cygwin is called by privileged
  processes to switch the user context.  This allows, for instance,
  ssh public key sessions with full network credentials to access shares
  on other machines.

- The mkpasswd and mkgroup tools have changed behaviour and a couple of
  new options to ease consistent usage in multi-machine or multi-domain


- Fallout from the long path names: If the current working directory is
  longer than 260 bytes, or if the current working directory is a virtual
  path (like /proc, /cygdrive, //server), don't call native Win32 programs
  since they don't understand these paths.

- On the first usage of a DOS path (C:\foo, \\foo\bar), the Cygwin DLL
  emits a scary warning that DOS paths shouldn't be used.  There's also
  the new CYGWIN=nodosfilewarning setting to disable that.

- Allow environment of arbitrary size instead of a maximum of 32K.

- Don't force uppercase environment when started from a non-Cygwin process.
  Except for certain Windows and POSIX variables which are always uppercased,
  preserve environment case.  Switch back to old behaviour with the new
  CYGWIN=upcaseenv setting.

- Detect and report a missing DLL on process startup.

- Add /proc/registry32 and /proc/registry64 paths to access 32 bit and
  64 bit registry on 64 bit systems.

- Add the ability to distinguish registry keys and registry values with the
  same name in the same registry subtree.  The key is called "foo" and the
  value will be called "foo%val" in this case.

- Align /proc/cpuinfo more closly to Linux content.

- Optimized strstr and memmem implementation.

- Remove backwards compatibility with old signal masks (some *very* old
  programs which use signal masks may no longer work correctly).

- Numerous bug fixes.

- Probably a couple of entirely new bugs.

Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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