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Latest Version
Cygwin 3.5.7 (64-bit) LATEST
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Operating System
Windows 7 64 / Windows 8 64 / Windows 10 64 / Windows 11
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Filename
setup-x86_64.exe
Cygwin 64bit provides a collection of GNU and open-source tools, allowing developers and system administrators to work in a Linux-like terminal without needing a virtual machine or dual-boot setup.
Originally developed by Cygnus Solutions (now part of Red Hat), Cygwin bridges the gap between Windows and Linux, making it a preferred choice for developers looking for a familiar command-line interface.
Main Features
Linux-like Terminal on Windows – Emulates a Unix shell and supports many native Linux commands.
Comprehensive Package Manager – Users can install various Unix-based utilities, including GCC, SSH, and Vim.
POSIX API Support – Allows developers to port Unix applications to Windows with minimal code modifications.
Interoperability with Windows – Supports Windows file paths and can execute Windows applications within the terminal.
Secure Shell (SSH) Support – Enables remote access via SSH for secure connections.
Scripting & Automation – Supports Bash, Python, Perl, and other scripting languages commonly used in Linux.
X11 Support – Allows users to run graphical Linux applications within Windows.
User Interface
Cygwin does not have a dedicated GUI but instead operates through the command line. Users interact via the Cygwin Terminal, which functions similarly to a Linux shell, supporting Bash, Zsh, and other Unix shells.
The minimalist design keeps distractions to a minimum, but users accustomed to GUI-based tools may find the learning curve steep.
Installation and Setup
- Download the Installer – Visit Cygwin’s official website and download setup-x86_64.exe for 64-bit Windows or setup-x86.exe for 32-bit systems.
- Run the Installer – Follow the on-screen instructions and choose an installation directory.
- Select Packages – The setup tool allows users to install essential utilities. Additional packages can be installed later.
- Set Environment Variables – Configure the Windows PATH to use Cygwin from the command prompt.
- Launch Cygwin – Open the terminal and start using Linux commands.
Basic Commands – Use commands like ls, cd, cp, mv, and rm to navigate the filesystem.
Running Shell Scripts – Execute .sh scripts similarly to a Linux environment.
Compiling Code – Use gcc or g++ for compiling C and C++ programs.
Networking – Connect via SSH using ssh user@hostname.
Package Management – Install new utilities via setup-x86_64.exe with the appropriate options.
FAQ
Is Cygwin 64bit a virtual machine or emulator?
No, Cygwin is neither a VM nor an emulator; it provides a compatibility layer that translates POSIX system calls into Windows equivalents.
Can I run Linux GUI applications in Cygwin?
Yes, by installing the X11 server package, you can run graphical Linux applications.
Does Cygwin support all Linux applications?
Not all Linux applications work natively on Cygwin due to differences in system calls, but many can be compiled from source.
How do I uninstall Cygwin?
Delete the Cygwin installation folder and remove environment variables manually.
Is there a performance impact when using Cygwin?
Cygwin may be slightly slower than native Linux, but it provides significant convenience without the overhead of a virtual machine.
Alternatives
WSL (Windows Subsystem for Linux) – Provides a full Linux kernel within Windows 10 and 11.
MinGW (Minimalist GNU for Windows) – Focused on compiling native Windows applications.
Mingw-w64 – Create to support the GCC and LLVM compiler on PC systems.
MobaXterm – An advanced terminal that integrates Unix commands and SSH features.
System Requirements
- OS: Windows 7, 8, 10, or 11
- RAM: 512MB minimum (2GB recommended)
- Storage: ~1GB for a basic installation, more if additional packages are installed
- Processor: Any modern x86_64 processor
- Provides a Unix-like environment on Windows
- Lightweight and does not require a virtual machine
- Large collection of GNU/Linux tools available
- Free and open-source
- Customizable package selection
- No full Linux kernel support like WSL
- Some Linux applications may not be fully compatible
- Installation process can be confusing for beginners
- Performance may not be as fast as native Linux
- Lacks an intuitive GUI for configuration
Cygwin is an excellent tool for developers, system administrators, and power users who need a Linux-like environment on Windows. While it lacks the full Linux kernel capabilities of WSL, its lightweight nature and vast package selection make it a valuable asset.
The learning curve may be steep for Windows users unfamiliar with Unix commands, but once mastered, Cygwin provides a flexible and powerful command-line experience.
Also Available: Cygwin (32-bit)
What's new in this version:
Cygwin 3.5.7 (64-bit)
Fixed:
- Fix stat() on message queues
- Avoid deadlocks when calling message queue functions from different threads in the same process
Cygwin 3.5.6 (64-bit)
Fixed:
- Fix a regression in 3.5.5 when checking for execute permissions in execve(2) and access(2)
- Fix a regression since 3.5.0 which fails to use POSIX semantics in unlink/rename on NTFS
- Add fd validation where needed in mq_* functions
- Fix regression in 3.5.5 which causes process hangs
- Minor updates to load average calculations
- Fix mq_unlink()
Cygwin 3.5.5 (64-bit)
Fixed:
- Fix undesired behaviour of console master thread in win32-input-mode which is supported by Windows Termainal
- Fix a regression in 3.5.4 that writing to pipe extremely slows down
- Fix pread() and pwrite() EBADF error after fork()
- Fix timer_delete() return value which always indicated failure
- Fix lockf() error which occurs when adding a new lock over multiple locks
- Make lockf() return ENOLCK when the number of locks exceeds MAX_LOCKF_CNT rather than printing a warning message
- Make console inherit hand over of pseudo console ownership from parent pty
- Restore pipe blocking mode for non-cygwin apps
- Fix a problem that signal handler destroys the FPU context
- Fix type of pthread_sigqueue() first parameter to match Linux
- Fix potential stack corruption in rmdir() in a border case
- Fix access violation in lf_clearlock() called from flock()
- Fix NtCreateEvent() error in create_lock_ob() called from flock()
- Fix segfault in sigtimedwait() when using timeout
- sched_setscheduler(2) allows to change the priority if the policy is equal to the value returned by sched_getscheduler(2)
- Fix frequent page fault caused in Windows Terminal
- Fix using invalid chars in temporary file names for deleted files
- Fix losing signals during setjmp/longjmp
- Fix several problems triggered when a lot of SIGSTOP/SIGCONT signals are received rapidly
- Fix the protection when mmap(2) recycles unused pages
Cygwin 3.5.4 (64-bit)
Fixed:
- Fix regression in 3.5.3 which fails to open files for stat(2) if the file is opened exclusively by another process
- Fix regression introduced in 3.5.0 when reading surrogate pairs (i.e., unicode chars >= 0x10000) from the DOS command line
- Fix regression of pthread::once() introduced in 3.5.0 (i.e., the race issue regarding destroying mutex)
- Fix a problem that ldd command against cygwin DLLs sometimes hangs
- Fix a problem that pty slave hangs on writing when pty master stops to read
- Fix conflict on shared name in console between sessions
- Fix an off-by-one in LC_MESSAGE wide character data
- Improve write pipe behaviour in case the pipe buffer is about to be filled up
Cygwin 3.5.3 (64-bit)
Fixed:
- Fix the problem that console setup accesses shared memory which is already unmapped due to race condition. To avoid this issue, shared console memory will be kept mapped if it belongs to CTTY.
- Fix a race issue between console open() and close() which is caused by state mismatch between con.owner and console attaching state
- Fix a problem that select() call for write-side of a pipe possibly hangs with non-cygwin reader
- Avoid recalling offline files if the file is not explicitely opened for reading or writing data
- Don't skip inadvertently some local SAM accounts on domain member machines
- Revert ill-advised optimization of glob(3) in case of caseinsensitive globbing
Cygwin 3.5.1 (64-bit)
Fixed:
- Fix exit code for non-cygwin process running in console. The bug was introduced in 3.5.0.
- Make the interface names handled by if_nametoindex() and if_indextoname() consistent with that of if_nameindex()
- Revert error handling for non-Cygwin child processes to use Cygwin's error mode by default. Resetting the error mode to the OS default error mode is now possible by using the new CYGWIN environment variable option "winjitdebug".
- Fix handle leak in pty master which occurs when non-cygwin process is started in pty
- Fix the problem that VMIN and VTIME does not work at all in console
- Fix a bug that cannot handle consoles more than 32, rather than 64
- Fix gettimeofday not checking for a NULL pointer
- Fix two bugs in strptime, error checking of invalid numerical input and %p handling
- Fix newgrp(1) group handling. Only allow groups already in the user token, as Windows doesn't allow otherwise
- Fix getgrent enumeration of local SAM accounts on domain member machines
Cygwin 3.5.0 (64-bit)
New:
- Drop support for Windows 7, Windows 8, Server 2008 R2 and Server 2012
- Console devices (/dev/consN) are now accessible by processes attached to other consoles or ptys. Thanks to this new feature, GNU screen and tmux now work in the console.
- newgrp(1) tool
- cygcheck has new options searching for available packages in the cygwin distro, as well as getting extended info on available and installed packages
- fnmatch(3) and glob(3) now support named character classes, equivalence class expressions, and collating symbols in the search pattern, i.e., [:alnum:], [=a=], [.aa.].
- Introduce /dev/disk directory with various by-* subdirectories which provide symlinks to disk and partition raw devices:
- by-drive/DRIVE_LETTER -> ../../sdXN
- by-label/VOLUME_LABEL -> ../../sdXN
- by-id/BUSTYPE-[VENDOR_]PRODUCT_[SERIAL|0xHASH][-partN] -> ../../sdX[N]
- by-partuuid/MBR_SERIAL-OFFSET -> ../../sdXN
- by-partuuid/GPT_GUID -> ../../sdXN
- by-uuid/VOLUME_SERIAL -> ../../sdXN
- by-voluuid/MBR_SERIAL-OFFSET -> ../../sdXN
- by-voluuid/VOLUME_GUID -> ../../sdXN
- The subdirectories by-drive and by-voluuid are Cygwin specific
- Introduce /proc/codesets and /proc/locales with information on supported codesets and locales for all interested parties. Locale(1) opens these files and uses the info for printing locale info like any other process could do.
- Add support for GB18030 codeset
- Add support for lseek flags SEEK_DATA and SEEK_HOLE, a GNU extension
- New API calls: posix_spawn_file_actions_addchdir_np, osix_spawn_file_actions_addfchdir_np
- New API calls: c8rtomb, c16rtomb, c32rtomb, mbrtoc8, mbrtoc16, mbrtoc32
- New API call: close_range (available on FreeBSD and Linux)
- New API call: fallocate (Linux-specific)
- Implement OSS-based sound mixer device (/dev/mixer)
Changed:
- posix_spawnp no longer falls back to starting the shell for unrecognized files as execvp. For the reasoning
- FIFOs now also work on NFS filesystems
- Enable automatic sparsifying of files on SSDs, independent of the "sparse" mount mode
- When RLIMIT_CORE is more than 1MB, a core dump file which can be loaded by gdb is now written on a fatal error. Otherwise, if it's greater than zero, a text format .stackdump file is written, as previously
- The default RLIMIT_CORE is now 0, disabling the generation of core dump or stackdump files
Fixed:
- Fix arc4random reseeding after fork(2)
Cygwin 3.4.10 (64-bit)
- Fix missing term in __cpuset_zero_s() prototoype in sys/cpuset.h
- Fix hang in process initialization if cwd is unreadable
- Let feraiseexcept actually raise an exception
- Make random(3) family of functions thread-safe
- Updates to profiler and gmondump: error display mechanics, buffer sizing, and output formatting
- Align behaviour of rand(3) to ISO C
- Fix posix_fallocate(3) return value in case of being called on other than regular files
- Reset sparseness in case open(2) has been called with O_CREAT|O_TRUNC on sparse files
Cygwin 3.4.9 (64-bit)
- Fix a bug introduced in cygwin 3.4.0 that switch_to_nat_pipe flag is not cleared properly when non-cygwin app is terminated in the case where pseudo console is not activated.
- For the time being, disable creating special files using mknod/mkfifo on NFS.
- Fix segfault when too many command line args are specified.
- Fix build problems in terms of sys/cpuset.h.
Cygwin 3.4.8 (64-bit)
- Make <sys/cpuset.h> safe for c89 compilations.
- Make gcc-specific code in <sys/cpuset.h> compiler-agnostic.
- Fix AT_EMPTY_PATH handling in fchmodat and fstatat if dirfd referres to a file other than a directory
- Rename internal macros _NL_CTYPE_OUTDIGITSx_MB/WC to GLibc compatible _NL_CTYPE_OUTDIGITx_MB/WC.
- Fix memory leak in printf() regarding gdtoa-based _ldtoa_r().
- Fix a bug introduced in cygwin 3.4.5 that open_shared() does not set access permissions as requested by its argument.
Cygwin 3.4.7 (64-bit)
- Fix CPU_SET(3) macro type mismatch by making the macros type-safe.
- Kill(1): don't print spurious error message.
- Align behaviour of dirname in terms of leading slashes to POSIX.
- Fix reading CONIN$ in non cygwin apps when stdin is not a pty.
- Fix bug in cygheap allocation size computation after fork.
- Fix return value of ilogbl(NaN).
- Fix error handling in readlinkat.
- Fix return code and errno set by renameat2, if oldfile and newfile
- refer to the same file, and the RENAME_NOREPLACE flag is set.
Cygwin 3.4.6 (64-bit)
- Fix a problem that fsync returns EINVAL for block device.
- Don't reject valid server and share names when mounting.
- Create directories with correctly umask-filtered default ACEs.
- Don't accidentally drop the default ACEs when chmod'ing directories.
Cygwin 3.4.3 (64-bit)
- Fix path handling to make sure virtual drives are never treated as symlinks.
- Revert incorrect optimization of wmemset()
Cygwin 3.4.1 (64-bit)
- This is a bugfix release.
- Fix a backward incompatibility problem in the definition of the base type of the stdio type FILE. This requires that C++ binaries compiled under Cygwin 3.4.0 having a public facing interface using
- FILE need to be recompiled.
- Fix an error introduced into the build process, resulting in `gcc -pg' becoming disfunctional.
- Fix performance degradation of non-cygwin pipe.
Cygwin 3.4.0 (64-bit)
- Drop support for Vista and Server 2008.
- Drop support for 32 bit Windows and WOW64.
- Allow to run with full ASLR enabled and enable on Cygwin DLL by default.
- Remove any special handling for the .com filename suffix. It has to be used always explicitely.
- Add code to handle setrlimit(RLIMIT_AS).
- Add code to handle signal masks in /proc//status.
- Handle UDP_SEGMENT and UDP_GRO socket options.
Cygwin 3.3.6 (64-bit)
- Fix an issue that command "cmd /c script -c cmd" crashes if it is issued in console of Windows 7.
- Fix killpg failing because the exec'ing as well as the exec'ed process are not in the pidlist for a brief moment.
- Fix mknod (64-bit only), whose definition didn't match its prototype.
- Fix a regression that prevented Cygwin from starting if cygwin1.dll is in the root directory.
- Handle setting very long window title correctly in console.
- Fix a bug of poll() that it returns event which is not inquired if events are inquired in multiple pollfd entries on the same fd at the same time.
- Fix a console problem that the text longer than 1024 bytes cannot be pasted correctly.
- Fix a pty problem that pty failed to switch I/O pipe to that for native apps if *.bat or *.cmd is executed directly from cygwin shell.
- Fix a problem that prevented some symbolic links to /cygdrive/C,/cygdrive/./c, /cygdrive//c, etc. from working.
- Fix a path handling bug that could cause a non-existing file to be treated as the current directory.
- Fix a crash in newlocale.
Cygwin 3.3.5 (64-bit)
- Fix a bug that accessing UNC path mounted to a drive letter using
- SMB3.11 fails with error "Too many levels of symbolic links.".
- Fix a console bug that escape sequence IL/DL (CSI Ps L, CSI Ps M) does not work correctly at the last line.
- Fix a problem that ENABLE_INSERT_MODE and ENABLE_QUICK_EDIT_MODE flags are cleared if cygwin is started in console.
- Fix an issue that cmd.exe also is terminated along with the cygwin app started from the cmd.exe if the cygwin app is terminated by Ctrl-C.
- Fix deadlock caused when keys are typed in pty while a lot of text output.
- Fix a problem that the console mode for input is not set correctly when non-cygwin app is started with stdin redirected.
- Fix some problems such as:
- 1) If output of non-cygwin app and input of cygwin app are connected by a pipe, Ctrl-C has to be sent twice to stop apps when the cygwin app does not read stdin at the moment.
- 2) In cmd.exe started from cygwin shell, if output of non-cygwin app and input of cygwin app are connected by a pipe, Ctrl-C can never terminate the apps.
- Fix exit code when non-cygwin app is terminated by Ctrl-C.
- Fix a bug that the order of the console key inputs are occasionally swapped, especially when CPU load is high.
- Fix a problem that fsync() flushes the console input buffer unlike linux. fsync() should return EINVAL for special files such as tty.
- Fix a formatting problem in gmondump where all displayed addresses are mistakenly prefixed with "0x0x". Fix man pages for gmondump and ssp.
- Fix crash on pty master close in Windows 7.
- Avoid deadlock of non-cygwin pipe writer which occurs when the other cygwin pipe writers exist if the pipe is created by system account or the pipe creator is running as service.
Cygwin 3.3.4
- Fix a bug in fhandler_dev_clipboard::read() that the second read fails with 'Bad address'.
- Convert UNC path prefix back to drive letter in symlink_info::check(). This solves the following issues:
- Fix a bug in pty code that input is wrongly sent to io_handle_nat rather than io_handle while neither read() nor select() is called after the cygwin app is started from non-cygwin app.
- Avoid a crash when NtQueryInformationProcess returns invalid handle data.
- Ignore INHERIT ACEs when reading the DACL of non-directory files.
- Fix an "Invalid argument" problem in posix_spawn on i686.
- Fix handling of AAAA records in Cygwin resolver code using native windows calls. Also fix various bugs in the resolver.
- Fix a problem creating a dir "foo", if a file (but not a Cygwin symlink) "foo.lnk" already exists.
- Fix double free for archetype, which is caused when open() fails.
- Fix a permission problem when writing DOS attributes on Samba.
Cygwin 3.3.3 (64-bit)
- Make sure that "X:" paths are not handled as absolute DOS paths in fstatat and other ...at calls. "X:/" still is handled as absolute path.
Fixed:
- issue that new pipe code doesn't handle size zero pipe which may be created by non-cygwin apps
- showing DLL version info from native Windows tools
- Handle Unicode surrogate pairs in console. Cygwin console does not handle surrogate pairs correctly at the moment. Fix issue that running bash in Windows Terminal and inserting an emoji does not work as expected.
- long-standing problem that fchmod or facl on newly created files screw up the DOS file attributes
- issue that pipe read()/write() occasionally returns a garbage length when NtReadFile/NtWriteFile returns STATUS_PENDING in non- blocking mode
- two bugs in raise(2)
- regression in printf introduced with Cygwin 3.3.2
Cygwin 3.3.1 (64-bit)
- Change log not available for this version
Cygwin 3.2.0 (64-bit)
New:
- Revamped pseudo console support. Conditionally activating it only when a non-cygwin application is run
- New C11 threads API: call_once, cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, cnd_wait, mtx_destroy, mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, thrd_create, thrd_current, thrd_detach, thrd_equal, thrd_exit, thrd_join, thrd_sleep, thrd_yield, tss_create, tss_delete, tss_get, tss_set.
- In cygwin console, new thread which handles special keys/signals such as Ctrl-Z (VSUSP), Ctrl- (VQUIT), Ctrl-S (VSTOP), Ctrl-Q (VSTART) and SIGWINCH has been introduced. There have been a long standing issue that these keys/signals are handled only when app calls read() or select(). Now, these work even if app does not call read() or select().
- Fchmodat(2) now has limited support for the AT_SYMLINK_NOFOLLOW flag.
- Cygwin now recognizes native Windows AF_UNIX sockets (as regular files, not as socket files). This allows tools like 'ls' and 'rm' to work.
Changed:
- Allow ~5000 child processes per process on 64 bit, ~1200 child processes per process on 32 bit. So far, only 256 child processes per process were supported
- A few FAQ updates
- Have tmpfile(3) make use of Win32 FILE_ATTRIBUTE_TEMPORARY via open(2) flag O_TMPFILE
- Utilize Windows 10 1809 FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE flag to allow simpler unlink of files with DOS readonly flags set
- Getdtablesize(3), sysconf(_SC_OPEN_MAX), and getrlimit(RLIMIT_NOFILE) now return the true limit on the number of open descriptors, 3200. Previously they returned the current size of Cygwin's internal file descriptor table, which can grow dynamically.
- Facl(2) now fails with EBADF on a file opened with O_PATH
- Allow to start Windows Store executables via their "app execution aliases". Handle these aliases (which are special reparse points) as symlinks to the actual executables.
Fixed:
- Iterate at least 4 times over pthread_key_t destructors per POSIX
- The pthread_yield declaration in pthread is now visible by default or when defining _BSD_SOURCE, too
- Fix SEGV in modfl call
- Fix a collision of offical and internally used file flags
- Fix assertion failure on an invalid path under /proc//fd/
- Fix crash on stat(2)'ing /dev/ptmx on 32 bit
- Fix return value of sqrtl on negative infinity
- Fix a path handling problem if there is a WSL symlink in PATH
- Fix a bug in fstatat(2) on 32 bit that could cause it to return garbage
- Fix the errno when a path contains .. and the prefix exists but is not a directory
- Fix the return value when ptsname_r(3) is called with a bad file descriptor
- Fix path handling in case the Cygwin installation dir is accessed via a Windows junction point.
- Fix potential handle leaks when dup'ing descriptors
- Fix a bug that could cause fstat(2) to return incorrect results on a FIFO
- Fix some system calls on AF_LOCAL sockets that are not socket files
- Fix access to block devices under /proc/sys
Cygwin 3.1.7 (64-bit)
Fixed:
- Fix acl_get_* functions in 32-bit Cygwin (pointer sign extension)
- Fix select/poll issue in case a socket connect call fails.
- Fix multiple reader support for FIFOs
- Fix an mmap issue that could cause failure with errno EFBIG
- Fix the behavior of C++ apps after an unhandled exception (64-bit only)
Cygwin 3.1.6 (64-bit)
- This is mainly a bugfix release
What changed:
- Support more IPPROTO_TCP socket options: TCP_FASTOPEN, TCP_KEEPIDLE, TCP_KEEPCNT, TCP_KEEPINTVL, TCP_QUICKACK, TCP_USER_TIMEOUT
Bug Fixes:
- Fix IPPROTO_TCP option handling, especially in terms of TCP_MAXSEG
- Fix a buffer overrun in Cygwin-internal string comparison
- Fix microcode registry lookup for /proc/cpuinfo output
Cygwin 3.1.4 (64-bit)
- Allow symlinks to be opened with O_PATH | O_NOFOLLOW
- Allow the pathname argument to readlinkat(2) to be an empty string, provided the dirfd argument refers to a symlink opened with O_PATH | O_NOFOLLOW. The readlinkat call then operates on that symlink.
- Support the Linux-specific AT_EMPTY_PATH flag for fchownat(2) and fstatat(2)
- Allow AF_LOCAL sockets to be opened with O_PATH
- <signal.h>: New macro _NSIG replacing NSIG. NSIG is now only visible to MISC builds, as on Linux
- The new locale modifier @cjksingle allows enforcing of single-width character property for usually double-widthed characters. This will be supported by upcoming mintty releases. For the reasoning, see https://gitlab.freedesktop.org/terminal-wg/specifications/issues/9.
Bug Fixes:
- Define CPU_SETSIZE, as on Linux
- Fix a regression that prevented the root of a drive from being the Cygwin installation root
- Many fixes in new pseudo console support
Cygwin 3.1.2 (64-bit)
- Change log not available for this version
Cygwin 3.1.1 (64-bit)
- This is a bugfix release. Due to an oversight, Cygwin 3.1.0 does not run on Windows Vista and Windows Server 2008. Cygwin 3.1.1 fixes that
Cygwin 3.0.7 (64-bit)
- Change log not available for this version
Cygwin 3.0.6 (64-bit)
- Change log not available for this version
Cygwin 3.0.5 (64-bit)
- Fix /proc/version after uname change
- Addresses: https://cygwin.com/ml/cygwin/2019-03/msg00467.html
- Fix a crash in wcsxfrm_l if destination size is 0.
- Addresses: https://cygwin.com/ml/cygwin/2019-03/msg00492.html
- Fix a problem in process enumeration which led to `ps -W' showing Cygwin processes twice and potentially with incorrect Windows PID. Addresses: Report on IRC
Cygwin 3.0.3 (64-bit)
- Change log not available for this version
Cygwin 3.0.1 (64-bit)
New:
- New API: secure_getenv
Bug Fixes:
- Relax fork child permissions to avoid a potential fork failure
- Fix Command-line argument handling of kill(1) in terms of negative PID. Addresses: report on IRC
- Fix an accidentally introduced O_TEXT handling of pipes inherited from native Windows processes
- Re-enable creating user token from scratch in seteuid to allow user context switch on old systems not supporting MsV1_0S4ULogon
Cygwin 2.10.0 (64-bit)
New:
- New open(2) flags O_TMPFILE and O_NOATIME
- scanf/wscanf now handle the POSIX %m modifier
- scanf now handles the %l[ conversion
- Improved hostprogs compatibility for cross-compiling the Linux kernel
- New headers: <asm/bitsperlong.h>, <asm/posix_types.h>
- Built-in implementation of Stack Smashing Protection compiler feature
- New APIs: __stack_chk_fail, __stack_chk_guard
- Built-in implementation of POSIX.1-2001 message catalog support
- New APIs: catclose, catgets, catopen. New tool: gencat
- New APIs: sigtimedwait, wmempcpy
What changed:
- Standard headers no longer use macros to support K&R C
- confstr(3) and getconf(1) accept LFS_CFLAGS, LFS_LDFLAGS, etc
- The __always_inline and __nonnull macros in <sys/cdefs.h> are now compatible with glibc
- Feature Test Macros improvements in <fcntl.h>, <limits.h>, <netdb.h>, <strings.h>, and <unistd.h>
Bug Fixes:
- Fix a problem in unlink on NFS
- Addresses: Shows up in GAWK testsuite test "testext"
- Fix errno setting bug in posix_fadvise and posix_fallocate
- Fix two bugs in the limit of large numbers of sockets
- Fix a fork failure with private anonymous mmaps
- Remove a call to fflush from ftell{o}, which may result in wrong offsets
- Fix file pointer computation after short writes on block devices
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