PERLCYGWIN(1perl)

📦
version 5.44.0 · 2 versions
, in arch rolling

💖 perlcygwin 💖

okay bestie, gather round, because this is perlcygwin from the Perl Programmers Reference Guide, section 1perl — aka the whole entire guide to building Perl on Cygwin. buckle up 🎀

🌸 NAME 🌸

perlcygwin — Perl for Cygwin. that's it, that's the name, iconic 💅

✨ SYNOPSIS ✨

so this doc is here to help you configure, make, test and install Perl on Cygwin. it also spills the tea on Cygwin features that change how Perl behaves when it's actually running, so like, runtime vibes.

NOTE: there are pre-built Perl packages already out there for Cygwin, and a version of Perl literally ships inside the normal Cygwin install. so if you don't need to customize your config at all, pls just use one of those packages, save yourself the whole journey bestie 😭

🦋 PREREQUISITES FOR COMPILING PERL ON CYGWIN 🦋

Cygwin = GNU+Cygnus+Windows (Don't leave UNIX without it)

The Cygwin tools are ports of the popular GNU development tools for Win32 platforms. They run thanks to the Cygwin library which provides the UNIX system calls and environment these programs expect. More info about this project lives here:

<https://www.cygwin.com/>

you need a recent net or commercial release of Cygwin. periodt.

At the time this document was last updated, Cygwin 3.0.7 was current. (yes, that's a dated screenshot of history, we're keeping it 💀)

Cygwin Configuration

While building Perl some changes may be necessary to your Cygwin setup so that Perl builds cleanly. These changes are not required for normal Perl usage, so don't panic.

NOTE: The binaries that are built will run on all Win32 versions. They do not depend on your host system or your Cygwin configuration (binary/text mounts, cygserver). The only dependencies come from hard-coded pathnames like /usr/local. However, your host system and Cygwin configuration will affect Perl's runtime behavior (see "TEST"). ✨
  • PATH — Set the PATH environment variable so that Configure finds the Cygwin versions of programs. Any not-needed Windows directories should be removed or moved to the end of your PATH. like, clean your room before guests arrive 🧹
  • nroff — If you do not have nroff (which is part of the groff package), Configure will not prompt you to install man pages. no man pages for you, sad!

💜 CONFIGURE PERL ON CYGWIN 💜

The default options gathered by Configure with the assistance of hints/cygwin.sh will build a Perl that supports dynamic loading (which requires a shared cygperl5_16.dll). cute.

This will run Configure and keep a record:

./Configure 2>&1 | tee log.configure

If you are willing to accept all the defaults, run Configure with -de. However, several useful customizations are available, so maybe don't just blindly slam yes 👀

🎀 Stripping Perl Binaries on Cygwin 🎀

It is possible to strip the EXEs and DLLs created by the build process. The resulting binaries will be significantly smaller (glow-down, not glow-up, but in a good way). If you want the binaries to be stripped, you can either add a -s option when Configure prompts you:

Any additional ld flags (NOT including libraries)? [none] -s
Any special flags to pass to g++ to create a dynamically loaded
library?
[none] -s
Any special flags to pass to gcc to use dynamic linking? [none] -s

or you can edit hints/cygwin.sh and uncomment the relevant variables near the end of the file. your choice bestie 💅

🦋 Optional Libraries for Perl on Cygwin 🦋

Several Perl functions and modules depend on the existence of some optional libraries. Configure will find them if they are installed in one of the directories listed as being used for library searches. Pre-built packages for most of these are available from the Cygwin installer. slay.

  • -lcrypt — The crypt package distributed with Cygwin is a Linux compatible 56-bit DES crypt port by Corinna Vinschen. Alternatively, the crypt libraries in GNU libc have been ported to Cygwin. As of libcrypt 1.3 (March 2016), you will need to install the libcrypt-devel package for Configure to detect crypt().
  • -lgdbm_compat (use GDBM_File) — GDBM is available for Cygwin.
NOTE: The GDBM library only works on NTFS partitions. no FAT, no ma'am 🙈
  • -ldb (use DB_File) — BerkeleyDB is available for Cygwin.
NOTE: The BerkeleyDB library only completely works on NTFS partitions.
  • cygserver (use IPC::SysV) — A port of SysV IPC is available for Cygwin.
NOTE: This has not been extensively tested. In particular, d_semctl_semun is undefined because it fails a Configure test. It also creates a compile time dependency because perl.h includes <sys/ipc.h> and <sys/sem.h> (which will be required in the future when compiling CPAN modules). CURRENTLY NOT SUPPORTED! 💀 like, do not.
  • -lutil — Included with the standard Cygwin netrelease is the inetutils package which includes libutil.a.

🌈 Configure-time Options for Perl on Cygwin 🌈

The INSTALL document describes several Configure-time options. Some of these will work with Cygwin, others are not yet possible. Also, some of these are experimental. You can either select an option when Configure prompts you or you can define (undefine) symbols on the command line.

  • -Uusedl — Undefining this symbol forces Perl to be compiled statically.
  • -Dusemymalloc — By default Perl does not use the malloc() included with the Perl source, because it was slower and not entirely thread-safe. If you want to force Perl to build with the old -Dusemymalloc, define this.
  • -Uuseperlio — Undefining this symbol disables the PerlIO abstraction. PerlIO is now the default; it is not recommended to disable PerlIO. don't do it bestie, trust.
  • -Dusemultiplicity — Multiplicity is required when embedding Perl in a C program and using more than one interpreter instance. This is only required when you build a not-threaded perl with -Uuseithreads.
  • -Uuse64bitint — By default Perl uses 64 bit integers. If you want to use smaller 32 bit integers, define this symbol.
  • -Duselongdouble — gcc supports long doubles (12 bytes). However, several additional long double math functions are necessary to use them within Perl ({atan2, cos, exp, floor, fmod, frexp, isnan, log, modf, pow, sin, sqrt}l, strtold). These are not yet available with newlib, the Cygwin libc. so close yet so far 😭
  • -Uuseithreads — Define this symbol if you want not-threaded faster perl.
  • -Duselargefiles — Cygwin uses 64-bit integers for internal size and position calculations, this will be correctly detected and defined by Configure. it just knows ✨
  • -Dmksymlinks — Use this to build perl outside of the source tree. Details can be found in the INSTALL document. This is the recommended way to build perl from sources. main character method fr fr 👑

🔥 MAKE ON CYGWIN 🔥

Simply run make and wait:

make -jn 2>&1 | tee log.make

where n is the maximum number of simultaneous compilations you want; omitting this parameter is the same as specifying -j1.

⭐ TEST ON CYGWIN ⭐

There are two steps to running the test suite:

make test 2>&1 | tee log.make-test

cd t; ./perl harness 2>&1 | tee ../log.harness

The same tests are run both times, but more information is provided when running as ./perl harness, and you can run the tests in parallel by instead specifying

cd t; TEST_JOBS=n ./perl harness 2>&1 | tee ../log.harness

where n is the maximum number of tests to run simulataneously.

Test results vary depending on your host system and your Cygwin configuration. If a test can pass in some Cygwin setup, it is always attempted and explainable test failures are documented. It is possible for Perl to pass all the tests, but it is more likely that some tests will fail for one of the reasons listed below. vibe check: sometimes things just fail and it's not your fault 💜

🍓 File Permissions on Cygwin 🍓

UNIX file permissions are based on sets of mode bits for {read,write,execute} for each {user,group,other}. By default Cygwin only tracks the Win32 read-only attribute represented as the UNIX file user write bit (files are always readable, files are executable if they have a .{com,bat,exe} extension or begin with #!, directories are always readable and executable). On WinNT with the ntea CYGWIN setting, the additional mode bits are stored as extended file attributes. On WinNT with the default ntsec CYGWIN setting, permissions use the standard WinNT security descriptors and access control lists. Without one of these options, these tests will fail (listing not updated yet):

Failed Test           List of failed
------------------------------------
io/fs.t               5, 7, 9-10
lib/anydbm.t          2
lib/db-btree.t        20
lib/db-hash.t         16
lib/db-recno.t        18
lib/gdbm.t            2
lib/ndbm.t            2
lib/odbm.t            2
lib/sdbm.t            2
op/stat.t             9, 20 (.tmp not an executable extension)

🌸 NDBM_File and ODBM_File do not work on FAT filesystems 🌸

Do not use NDBM_File or ODBM_File on FAT filesystem. They can be built on a FAT filesystem, but many tests will fail:

 ../ext/NDBM_File/ndbm.t       13  3328    71   59  83.10%  1-2 4 16-71
 ../ext/ODBM_File/odbm.t      255 65280    ??   ??       %  ??
 ../lib/AnyDBM_File.t           2   512    12    2  16.67%  1 4
 ../lib/Memoize/t/errors.t      0   139    11    5  45.45%  7-11
 ../lib/Memoize/t/tie_ndbm.t   13  3328     4    4 100.00%  1-4
 run/fresh_perl.t                          97    1   1.03%  91

If you intend to run only on FAT (or if using AnyDBM_File on FAT), run Configure with the -Ui_ndbm and -Ui_dbm options to prevent NDBM_File and ODBM_File being built. dodging the problem entirely, valid strategy 🫶

With NTFS (and no CYGWIN=nontsec), there should be no problems even if perl was built on FAT. ✨

🎀 fork() failures in io_* tests 🎀

A fork() failure may result in the following tests failing:

ext/IO/lib/IO/t/io_multihomed.t
ext/IO/lib/IO/t/io_sock.t
ext/IO/lib/IO/t/io_unix.t

See comment on fork in "Miscellaneous" below.

Specific features of the Cygwin port ✨

Script Portability on Cygwin 🦋

Okay bestie, real talk: Cygwin does an outstanding job of giving you UNIX-like vibes on top of Win32 systems. But on top of everything already mentioned above, there are some differences you genuinely need to know about. This is a very brief guide to portability — more deets live in the Cygwin documentation. iykyk.

  • Pathnames 🛤️

Cygwin pathnames are separated by forward slashes (/), and Universal Naming Codes (//UNC) are also supported. Since cygwin-1.7 non-POSIX pathnames should not be used. Names may contain all printable characters. ✨

File names are case insensitive, but case preserving. A pathname that contains a backslash or a drive letter is a Win32 pathname, and it is not subject to the translations applied to POSIX style pathnames — but cygwin will warn you, so literally just convert them to POSIX, it's giving self-care.

For conversion we have Cygwin::win_to_posix_path() and Cygwin::posix_to_win_path().

Since cygwin-1.7 pathnames are UTF-8 encoded. 💅

  • Text/Binary 📝

Since cygwin-1.7 textmounts are deprecated and strongly discouraged. Periodt.

When a file is opened it is in either text or binary mode. In text mode a file is subject to CR/LF/Ctrl-Z translations. With Cygwin, the default mode for an open() is determined by the mode of the mount that underlies the file. See "Cygwin::is_binmount"(). Perl provides a binmode() function to set binary mode on files that otherwise would be treated as text. sysopen() with the "O_TEXT" flag sets text mode on files that otherwise would be treated as binary:

sysopen(FOO, "bar", O_WRONLY|O_CREAT|O_TEXT)

lseek(), tell() and sysseek() only work with files opened in binary mode. 👑

The text/binary issue is covered at length in the Cygwin documentation.

  • PerlIO 🌊

PerlIO overrides the default Cygwin Text/Binary behaviour. A file will always be treated as binary, regardless of the mode of the mount it lives on, just like it is in UNIX. So CR/LF translation needs to be requested either in the open() call like this:

open(FH, ">:crlf", "out.txt");

which will do conversion from LF to CR/LF on the output, or in the environment settings (add this to your .bashrc):

export PERLIO=crlf

which will pull in the crlf PerlIO layer which does LF -> CRLF conversion on every output generated by perl. slay. 💖

  • .exe 🪟

The Cygwin stat(), lstat() and readlink() functions make the .exe extension transparent by looking for foo.exe when you ask for foo (unless a foo also exists). Cygwin does not require a .exe extension, but gcc adds it automatically when building a program. However, when accessing an executable as a normal file (e.g., cp in a makefile) the .exe is not transparent. The install program included with Cygwin automatically appends a .exe when necessary.

  • Cygwin vs. Windows process ids 🆔

Cygwin processes have their own pid, which is different from the underlying windows pid. Most posix compliant Proc functions expect the cygwin pid, but several Win32::Process functions expect the winpid. E.g. $$ is the cygwin pid of /usr/bin/perl, which is not the winpid. Use Cygwin::pid_to_winpid() and Cygwin::winpid_to_pid() to translate between them.

  • Cygwin vs. Windows errors 😭

Under Cygwin, $^E is the same as $!. When using Win32 API Functions, use Win32::GetLastError() to get the last Windows error.

  • rebase errors on fork or system 💀

Using fork() or system() out to another perl after loading multiple dlls may result on a DLL baseaddress conflict. The internal cygwin error looks like the following:

0 [main] perl 8916 child_info_fork::abort: data segment start:
parent (0xC1A000) != child(0xA6A000)

or:

183 [main] perl 3588 C:\cygwin\bin\perl.exe: *** fatal error -
unable to remap C:\cygwin\bin\cygsvn_subr-1-0.dll to same address
as parent(0x6FB30000) != 0x6FE60000 46 [main] perl 3488 fork: child
3588 - died waiting for dll loading, errno11

See https://cygwin.com/faq/faq.html#faq.using.fixing-fork-failures. It helps if not too many DLLs are loaded in memory so the available address space is larger — e.g. stopping the MS Internet Explorer might help. 🫶

+Use the rebase utilities to resolve the conflicting dll addresses. The rebase package is included in the Cygwin setup. Use setup.exe from https://cygwin.com/install.html to install it.

  1. kill all perl processes and run
"/bin/find <dir" -xdev -name \*.dll | /bin/rebase -OT ->>

or

  1. kill all cygwin processes and services, and run setup.exe.
  • Miscellaneous 🎀

File locking using the "F_GETLK" command to fcntl() is a stub that returns "ENOSYS".

The Cygwin chroot() implementation has holes (it can not restrict file access by native Win32 programs). 🙈

Inplace editing "perl -i" of files doesn't work without doing a backup of the file being edited "perl -i.bak" because of windowish restrictions, therefore Perl adds the suffix .bak automatically if you use "perl -i" without specifying a backup extension.

Prebuilt methods: 🧰

  • "Cwd::cwd" — Returns the current working directory.
  • "Cygwin::pid_to_winpid" — Translates a cygwin pid to the corresponding Windows pid (which may or may not be the same).
  • "Cygwin::winpid_to_pid" — Translates a Windows pid to the corresponding cygwin pid (if any).
  • "Cygwin::win_to_posix_path" — Translates a Windows path to the corresponding cygwin path respecting the current mount points. With a second non-null argument returns an absolute path. Double-byte characters will not be translated.
  • "Cygwin::posix_to_win_path" — Translates a cygwin path to the corresponding cygwin path respecting the current mount points. With a second non-null argument returns an absolute path. Double-byte characters will not be translated.
  • Cygwin::mount_table() — Returns an array of [mnt_dir, mnt_fsname, mnt_type, mnt_opts].
perl -e 'for $i (Cygwin::mount_table) {print join(" ",@$i),"\n";}'
/bin c:\cygwin\bin system binmode,cygexec
/usr/bin c:\cygwin\bin system binmode
/usr/lib c:\cygwin\lib system binmode
/ c:\cygwin system binmode
/cygdrive/c c: system binmode,noumount
/cygdrive/d d: system binmode,noumount
/cygdrive/e e: system binmode,noumount
  • "Cygwin::mount_flags" — Returns the mount type and flags for a specified mount point. A comma-separated string of mntent->mnt_type (always "system" or "user"), then the mntent->mnt_opts, where the first is always "binmode" or "textmode".
system|user,binmode|textmode,exec,cygexec,cygdrive,mixed,
notexec,managed,nosuid,devfs,proc,noumount

If the argument is "/cygdrive", then just the volume mount settings, and the cygdrive mount prefix are returned.

User mounts override system mounts. 💅

$ perl -e 'print Cygwin::mount_flags "/usr/bin"'
system,binmode,cygexec
$ perl -e 'print Cygwin::mount_flags "/cygdrive"'
binmode,cygdrive,/cygdrive
  • "Cygwin::is_binmount" — Returns true if the given cygwin path is binary mounted, false if the path is mounted in textmode.
  • "Cygwin::sync_winenv" — Cygwin does not initialize all original Win32 environment variables. See the bottom of this page https://cygwin.com/cygwin-ug-net/setup-env.html for "Restricted Win32 environment".

Certain Win32 programs called from cygwin programs might need some environment variable, such as e.g. ADODB needs %COMMONPROGRAMFILES%. Call Cygwin::sync_winenv() to copy all Win32 environment variables to your process and note that cygwin will warn on every encounter of non-POSIX paths. 😭

🌈 INSTALL PERL ON CYGWIN 🌈

This will install Perl, including man pages. iconic.

make install 2>&1 | tee log.make-install
NOTE: If "STDERR" is redirected make install will not prompt you to install perl into /usr/bin.

You may need to be Administrator to run "make install". If you are not, you must have write access to the directories in question. 👑

Information on installing the Perl documentation in HTML format can be found in the INSTALL document.

📋 MANIFEST ON CYGWIN 📋

okay so like, this is the receipts section bestie 💅 — every single file in the Perl release that name-drops Cygwin somewhere inside it. And the lil notes next to each one are here to explain why that conditional code exists at all.

the whole point: keep these notes fresh, keep the Cygwin port clean. iconic maintenance behaviour honestly. 🧚

Documentation 💖

these are the docs and changelogs that talk about Cygwin, fr:

INSTALL README.cygwin README.win32 MANIFEST
pod/perl.pod pod/perlport.pod pod/perlfaq3.pod
pod/perldelta.pod pod/perl5004delta.pod pod/perl56delta.pod
pod/perl561delta.pod pod/perl570delta.pod pod/perl572delta.pod
pod/perl573delta.pod pod/perl58delta.pod pod/perl581delta.pod
pod/perl590delta.pod pod/perlhist.pod pod/perlmodlib.pod
pod/perltoc.pod Porting/Glossary pod/perlgit.pod
Porting/updateAUTHORS.pl
dist/Cwd/Changes ext/Compress-Raw-Zlib/Changes
dist/Time-HiRes/Changes
ext/Compress-Raw-Zlib/README ext/Compress-Zlib/Changes
ext/DB_File/Changes ext/Encode/Changes ext/Sys-Syslog/Changes
ext/Win32API-File/Changes
lib/ExtUtils/CBuilder/Changes lib/ExtUtils/Changes
lib/ExtUtils/NOTES lib/ExtUtils/PATCHING lib/ExtUtils/README
lib/Net/Ping/Changes lib/Test/Harness/Changes
lib/Term/ANSIColor/ChangeLog lib/Term/ANSIColor/README

Build, Configure, Make, Install 🔨

  • cygwin/Makefile.SHs
  • ext/IPC/SysV/hints/cygwin.pl
  • ext/NDBM_File/hints/cygwin.pl
  • ext/ODBM_File/hints/cygwin.pl
  • hints/cygwin.sh
  • Configure — helps you find hints from uname; shared libperl is required for dynamic loading
  • Makefile.SH, Cross/Makefile-cross-SH — linklibperl
  • Porting/patchls — cygwin shows up in the port list
  • installman — man pages get :: translated to .
  • installperl — installs the dll, installs into 'pods'
  • makedepend.SH — uwinfix
  • regen_lib.pl — file permissions

and also these vibes:

  • plan9/mkfile
  • vms/descrip_mms.template
  • win32/Makefile

Tests 🧪

  • t/io/fs.t — no file mode checks if you're not using ntsec; skips the rename() check when it's not check_case:relaxed
  • t/io/tell.t — binmode
  • t/lib/cygwin.t — builtin cygwin function tests
  • t/op/groups.t — basegroup has ID = 0
  • t/op/magic.t — $^X/symlink WORKAROUND, s/.exe//
  • t/op/stat.t — no /dev; skips the Win32 ftCreationTime quirk (because the cache manager sometimes preserves ctime of a file that was previously created and deleted); no -u (setuid)
  • t/op/taint.t — can't use an empty path under Cygwin Perl
  • t/op/time.t — no tzset()

Compiled Perl Source 💀

  • EXTERN.h — __declspec(dllimport)
  • XSUB.h — __declspec(dllexport)
  • cygwin/cygwin.c — os_extras (getcwd, spawn, and several Cygwin:: functions)
  • perl.c — os_extras, -i.bak
  • perl.h — binmode
  • doio.c — win9x can not rename a file when it is open
  • pp_sys.c — do not define h_errno, init _pwent_struct.pw_comment
  • util.c — use setenv
  • util.h — PERL_FILE_IS_ABSOLUTE macro
  • pp.c — comment about Posix vs IEEE math under Cygwin
  • perlio.c — CR/LF mode
  • perliol.c — comment about EXTCONST under Cygwin

Compiled Module Source 🧵

  • ext/Compress-Raw-Zlib/Makefile.PL — can't install via the CPAN shell under Cygwin
  • ext/Compress-Raw-Zlib/zlib-src/zutil.h — Cygwin is Unix-like and has vsnprintf
  • ext/Errno/Errno_pm.PL — special handling for Win32 Perl under Cygwin
  • ext/POSIX/POSIX.xs — tzname defined externally
  • ext/SDBM_File/sdbm/pair.c — EXTCONST needs to be redefined from EXTERN.h
  • ext/SDBM_File/sdbm/sdbm.c — binary open
  • ext/Sys/Syslog/Syslog.xs — Cygwin has syslog.h
  • ext/Sys/Syslog/win32/compile.pl — convert paths to Windows paths
  • ext/Time-HiRes/HiRes.xs — various timers not available
  • ext/Time-HiRes/Makefile.PL — find w32api/windows.h
  • ext/Win32/Makefile.PL — use various libraries under Cygwin
  • ext/Win32/Win32.xs — child dir and child env under Cygwin
  • ext/Win32API-File/File.xs — _open_osfhandle not implemented under Cygwin
  • ext/Win32CORE/Win32CORE.c — __declspec(dllexport)

Perl Modules/Scripts 🫶

  • ext/B/t/OptreeCheck.pm — comment about stderr/stdout order under Cygwin
  • ext/Digest-SHA/bin/shasum — use binary mode under Cygwin
  • ext/Sys/Syslog/win32/Win32.pm — convert paths to Windows paths
  • ext/Time-HiRes/HiRes.pm — comment about various timers not available
  • ext/Win32API-File/File.pm — _open_osfhandle not implemented under Cygwin
  • ext/Win32CORE/Win32CORE.pm — history of Win32CORE under Cygwin
  • lib/Cwd.pm — hook to internal Cwd::cwd
  • lib/ExtUtils/CBuilder/Platform/cygwin.pm — use gcc for ld, and link to libperl.dll.a
  • lib/ExtUtils/CBuilder.pm — Cygwin is Unix-like
  • lib/ExtUtils/Install.pm — install and rename issues under Cygwin
  • lib/ExtUtils/MM.pm — OS classifications
  • lib/ExtUtils/MM_Any.pm — example for Cygwin
  • lib/ExtUtils/MakeMaker.pm — requires MM_Cygwin.pm
  • lib/ExtUtils/MM_Cygwin.pm — canonpath, cflags, manifypods, perl_archive
  • lib/File/Fetch.pm — comment about quotes using a Cygwin example
  • lib/File/Find.pm — on remote drives stat() always sets st_nlink to 1
  • lib/File/Spec/Cygwin.pm — case_tolerant
  • lib/File/Spec/Unix.pm — preserve //unc
  • lib/File/Spec/Win32.pm — references a message on cygwin.com
  • lib/File/Spec.pm — pulls in lib/File/Spec/Cygwin.pm
  • lib/File/Temp.pm — no directory sticky bit
  • lib/Module/CoreList.pm — list of all module files and versions
  • lib/Net/Domain.pm — no domainname command under Cygwin
  • lib/Net/Netrc.pm — bypass using stat() under Cygwin
  • lib/Net/Ping.pm — ECONREFUSED is EAGAIN under Cygwin
  • lib/Pod/Find.pm — set 'pods' dir
  • lib/Pod/Perldoc/ToMan.pm — '-c' switch for pod2man
  • lib/Pod/Perldoc.pm — use 'less' pager, and use .exe extension
  • lib/Term/ANSIColor.pm — Cygwin terminal info
  • lib/perl5db.pl — use stdin not /dev/tty
  • utils/perlbug.PL — add CYGWIN environment variable to report

Perl Module Tests 🍓

no annotations here, just the whole squad:

dist/Cwd/t/cwd.t
ext/Compress-Zlib/t/14gzopen.t
ext/DB_File/t/db-btree.t
ext/DB_File/t/db-hash.t
ext/DB_File/t/db-recno.t
ext/DynaLoader/t/DynaLoader.t
ext/File-Glob/t/basic.t
ext/GDBM_File/t/gdbm.t
ext/POSIX/t/sysconf.t
ext/POSIX/t/time.t
ext/SDBM_File/t/sdbm.t
ext/Sys/Syslog/t/syslog.t
ext/Time-HiRes/t/HiRes.t
ext/Win32/t/Unicode.t
ext/Win32API-File/t/file.t
ext/Win32CORE/t/win32core.t
lib/AnyDBM_File.t
lib/Archive/Extract/t/01_Archive-Extract.t
lib/Archive/Tar/t/02_methods.t
lib/ExtUtils/t/Embed.t
lib/ExtUtils/t/eu_command.t
lib/ExtUtils/t/MM_Cygwin.t
lib/ExtUtils/t/MM_Unix.t
lib/File/Compare.t
lib/File/Copy.t
lib/File/Find/t/find.t
lib/File/Path.t
lib/File/Spec/t/crossplatform.t
lib/File/Spec/t/Spec.t
lib/Net/hostent.t
lib/Net/Ping/t/110_icmp_inst.t
lib/Net/Ping/t/500_ping_icmp.t
lib/Net/t/netrc.t
lib/Pod/Simple/t/perlcyg.pod
lib/Pod/Simple/t/perlcygo.txt
lib/Pod/Simple/t/perlfaq.pod
lib/Pod/Simple/t/perlfaqo.txt
lib/User/grent.t
lib/User/pwent.t

🐛 BUGS ON CYGWIN 🐛

okay bestie, deep breath, because this one's the actual problem 😭

support for swapping real and effective user and group IDs is incomplete. on WinNT, Cygwin gives you setuid(), seteuid(), setgid() and setegid() — cute, love that for us 💅 — however, there are additional Cygwin calls needed for manipulating WinNT access tokens and security contexts that just... aren't there yet. so like. yeah. incomplete fr.

⚠️ lowkey important: don't assume the uid/gid swap life is fully working. it's not.

👑 AUTHORS 👑

the whole main-character lineup, give them their flowers 🌸:

  • Charles Wilson cwilson@ece.gatech.edu
  • Eric Fifer egf7@columbia.edu
  • alexander smishlajev als@turnhere.com
  • Steven Morlock newspost@morlock.net
  • Sebastien Barre Sebastien.Barre@utc.fr
  • Teun Burgers burgers@ecn.nl
  • Gerrit P. Haase gp@familiehaase.de
  • Reini Urban rurban@cpan.org
  • Jan Dubois jand@activestate.com
  • Jerry D. Hedden jdhedden@cpan.org

📜 HISTORY 📜

last updated: 2019-11-14

and that's a wrap bestie 🎀✨ this whole thing is from perl v5.44.0, dated 2026-10-17, and you just read the one and only PERLCYGWIN(1perl) — go forth and compile, you absolute legend 👑💖

📦 where this page comes from