[1.7] Updated: cygwin-1.7.0-42

Corinna Vinschen corinna-cygwin@cygwin.com
Fri Mar 6 11:52:00 GMT 2009

Hi folks,

I just uploaded a new Cygwin 1.7 test release, 1.7.0-42.

Cygwin 1.7 is a major jump from Cygwin 1.5.x.  The list with all
changes related to Cygwin 1.5.25 is attached below.

Just download http://cygwin.com/setup-1.7.exe and use that setup tool
to install Cygwin 1.7.  As usual, please report bugs and problems to
the mailing list cygwin AT cygwin DOT com.

We also have a new User's Guide for 1.7, which is currently located at

We also now have new API documentation

And we have a new FAQ, though very likely not quite complete since
we still don't know what exactly *is* a FAQ realted to Cygwin 1.7.

Bug fixes and extensions to the documentation in the form of patches
to the source SGML files are much appreciated.  The SGML sources are
located in the CVS repository under the winsup/doc directory, for
example here: http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/doc/?cvsroot=src

Same goes for Cygwin patches in general, of course.


Nevertheless I'd like to encourage everyone to give 1.7 a shot.  Due to
internal changes it is possible to install a 1.7 release in parallel to
a 1.5 release and even run 1.7 processes in parallel to 1.5 processes.

* The processes will not know about each other!  Any try to interact
* between 1.7-based and 1.5-based processes will lead to, at least, funny
* results.

To install a 1.7 release in parallel to a 1.5 release, all you have
to do is to choose another root directory (for instance: C:\cygwin-1.7)
in setup-1.7's "Choose Installation Directory" dialog.

* NOTE: Due to the way setup-1.7 works, you have to change the directory
* right the first time you visit this dialog!  If you pressed the "Next"
* button and then "Back" again, it's already too late and setup-1.7 will
* create a broken 1.7 install.  If you pressed "Next" by mistake, exit
* setup-1.7 and start it again.

What's new in contrast to 1.7.0-41

- New functions wprintf, fwprintf, swprintf, vwprintf, vfwprintf, vswprintf.

- New setlocale implementation allows to specify POSIX locale strings.
  You can now use, for instance in bash, `export LC_ALL=en_US.UTF-8'.
  The language and territory will be ignored for now, the charset
  will be used by multibyte-releated functions.

- wctomb/mbtowc can now handle surrogate pairs.

- So far there was a hack in the 1.7.0 Cygwin DLL which disabled
  DEP (Data Execution Prevention) on a per-application base when
  running on a Windows Server 2008 Terminal Server.  This was necessary
  to avoid spurious crashes of Cygwin applications due to a bug in
  a Windows DLL.  This DLL (tsappcmp.dll) is only called on Terminal
  Servers for applications which don't have the TS-awareness flag set
  in the executable's file header.
  It turned out that we can simply avoid the crashes by switching on the
  TS-awareness bit in executables.  In future this will be done
  automatically when building new applications.  For older applications
  there will be a new tool called `peflags', curtesy Charles Wilson,
  which allows to set this flag (among others) on already existing

  Therefore, and because the hack to switch off DEP in the DLL is a
  major performance killer, the hack has now been disabled in the DLL.


- Fix select(2) on FIFOs.

- A long standing problem in newlib's setlocale() function disallows to
  read the locale specific LC_* environment variables.

- Fix mbtowc/wctomb so as not to handle invalid 5 and 6 byte UTF-8 sequences.
  Fix wctomb singlebyte behaviour in case the icoming wide char doesn't fit.

- Fix cygdrive output in mount -m command.


- Q: How do I know that I'm running Cygwin 1.7.0-41?

  A: The `uname -v' command prints "2009-03-06 11:28"

Have fun,

Here's the list of user-visible changes in 1.7.0 related to 1.5.25:


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. 

- Incoming DOS paths are always handled case-insensitive and get no POSIX
  permission, as if they are mounted with noacl,posix=0 mount flags.

- 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.

- New open(2) flags O_DIRECTORY, O_EXEC and O_SEARCH.

- 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, open_wmemstream, 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: cfmakeraw, posix_openpt.

Other POSIX related changes:

- Allow multiple concurrent read locks per thread for pthread_rwlock_t.

- 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: _Exit, confstr, insque, remque, sys_sigabbrev,
  posix_madvise, posix_memalign, reallocf,
  exp10, exp10f, pow10, pow10f, lrint, lrintf, rint, rintf, llrint, llrintf,
  llrintl, lrintl, rintl,
  mbsnrtowcs, strcasestr, stpcpy, stpncpy, wcpcpy, wcpncpy, wcsnlen,
  wcsnrtombs, wcstod, wcstof, wcstoimax, wcstok, wcstol, wcstoll, wcstoul,
  wcstoull, wcstoumax, wcsxfrm,
  fgetwc, fgetws, fputwc, fputws, fwide, getwc, getwchar, putwc, putwchar,
  ungetwc, asnprintf, dprintf, vasnprintf, vdprintf,
  wprintf, fwprintf, swprintf, vwprintf, vfwprintf, vswprintf.

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


- New ldd utility, similar to Linux.

- 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.

- The CYGWIN environment variable option "server" has been removed.
  Cygwin automatically uses cygserver if it's available.

- 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.

- Add /proc/$PID/mounts entries and a symlink /proc/mounts pointing to
  /proc/self/mounts as on Linux.

- 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.



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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin@cygwin.com
Red Hat, Inc.

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