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1If you read this file _as_is_, just ignore the funny characters you
2see. It is written in the POD format (see pod/perlpod.pod) which is
3specially designed to be readable as is.
5aabfad6 4
8736538c 5=head1 NAME
5aabfad6 6
f8dbba82 7README.cygwin - Perl for Cygwin
5aabfad6 8
8736538c 9=head1 SYNOPSIS
5aabfad6 10
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11This document will help you configure, make, test and install Perl
12on Cygwin. This document also describes features of Cygwin that will
13affect how Perl behaves at runtime.
5aabfad6 14
f8dbba82 15B<NOTE:> There are pre-built Perl packages available for Cygwin and a
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16version of Perl is provided in the normal Cygwin install. If you do
17not need to customize the configuration, consider using one of those
18packages.
5aabfad6 19
5aabfad6 20
a83b6f46 21=head1 PREREQUISITES FOR COMPILING PERL ON CYGWIN
8736538c 22
f8dbba82 23=head2 Cygwin = GNU+Cygnus+Windows (Don't leave UNIX without it)
8736538c 24
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25The Cygwin tools are ports of the popular GNU development tools for Win32
26platforms. They run thanks to the Cygwin library which provides the UNIX
27system calls and environment these programs expect. More information
28about this project can be found at:
8736538c 29
47dafe4d 30 http://www.cygwin.com/
1cab015a 31
f8dbba82 32A recent net or commercial release of Cygwin is required.
8736538c 33
be238d52 34At the time this document was last updated, Cygwin 1.5.2 was current.
8736538c 35
1cab015a 36
f8dbba82 37=head2 Cygwin Configuration
1cab015a 38
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39While building Perl some changes may be necessary to your Cygwin setup so
40that Perl builds cleanly. These changes are B<not> required for normal
41Perl usage.
1cab015a 42
f8dbba82 43B<NOTE:> The binaries that are built will run on all Win32 versions.
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44They do not depend on your host system (Win9x/WinME, WinNT/Win2K)
45or your Cygwin configuration (I<ntea>, I<ntsec>, binary/text mounts).
46The only dependencies come from hard-coded pathnames like C</usr/local>.
47However, your host system and Cygwin configuration will affect Perl's
48runtime behavior (see L</"TEST">).
1cab015a 49
f8dbba82 50=over 4
1cab015a 51
f8dbba82 52=item * C<PATH>
1cab015a 53
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54Set the C<PATH> environment variable so that Configure finds the Cygwin
55versions of programs. Any Windows directories should be removed or
56moved to the end of your C<PATH>.
1cab015a 57
f8dbba82 58=item * I<nroff>
1cab015a 59
f8dbba82 60If you do not have I<nroff> (which is part of the I<groff> package),
b4bcd662 61Configure will B<not> prompt you to install I<man> pages.
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62
63=item * Permissions
64
65On WinNT with either the I<ntea> or I<ntsec> C<CYGWIN> settings, directory
66and file permissions may not be set correctly. Since the build process
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67creates directories and files, to be safe you may want to run a
68C<chmod -R +w *> on the entire Perl source tree.
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69
70Also, it is a well known WinNT "feature" that files created by a login
71that is a member of the I<Administrators> group will be owned by the
72I<Administrators> group. Depending on your umask, you may find that you
73can not write to files that you just created (because you are no longer
74the owner). When using the I<ntsec> C<CYGWIN> setting, this is not an
75issue because it "corrects" the ownership to what you would expect on
76a UNIX system.
1cab015a 77
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78=back
79
a83b6f46 80=head1 CONFIGURE PERL ON CYGWIN
8736538c 81
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82The default options gathered by Configure with the assistance of
83F<hints/cygwin.sh> will build a Perl that supports dynamic loading
84(which requires a shared F<libperl.dll>).
f89d6eaa 85
f8dbba82 86This will run Configure and keep a record:
8736538c 87
f8dbba82 88 ./Configure 2>&1 | tee log.configure
8736538c 89
b4bcd662 90If you are willing to accept all the defaults run Configure with B<-de>.
f8dbba82 91However, several useful customizations are available.
5aabfad6 92
a83b6f46 93=head2 Stripping Perl Binaries on Cygwin
5aabfad6 94
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95It is possible to strip the EXEs and DLLs created by the build process.
96The resulting binaries will be significantly smaller. If you want the
97binaries to be stripped, you can either add a B<-s> option when Configure
98prompts you,
8736538c 99
f8dbba82 100 Any additional ld flags (NOT including libraries)? [none] -s
5db16f6a 101 Any special flags to pass to gcc to use dynamic linking? [none] -s
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102 Any special flags to pass to ld2 to create a dynamically loaded library?
103 [none] -s
8736538c 104
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105or you can edit F<hints/cygwin.sh> and uncomment the relevant variables
106near the end of the file.
8736538c 107
a83b6f46 108=head2 Optional Libraries for Perl on Cygwin
8736538c 109
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110Several Perl functions and modules depend on the existence of
111some optional libraries. Configure will find them if they are
112installed in one of the directories listed as being used for library
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113searches. Pre-built packages for most of these are available from
114the Cygwin installer.
8736538c 115
f8dbba82 116=over 4
8736538c 117
f8dbba82 118=item * C<-lcrypt>
8736538c 119
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120The crypt package distributed with Cygwin is a Linux compatible 56-bit
121DES crypt port by Corinna Vinschen.
122
123Alternatively, the crypt libraries in GNU libc have been ported to Cygwin.
1cab015a 124
5db16f6a 125The DES based Ultra Fast Crypt port was done by Alexey Truhan:
1cab015a 126
2ca463cb 127 ftp://ftp.uni-erlangen.de/pub/pc/gnuwin32/cygwin/porters/Okhapkin_Sergey/cw32crypt-dist-0.tgz
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128
129NOTE: There are various export restrictions on DES implementations,
130see the glibc README for more details.
1cab015a 131
f8dbba82 132The MD5 port was done by Andy Piper:
1cab015a 133
2ca463cb 134 ftp://ftp.uni-erlangen.de/pub/pc/gnuwin32/cygwin/porters/Okhapkin_Sergey/libcrypt.tgz
1cab015a 135
f8dbba82 136=item * C<-lgdbm> (C<use GDBM_File>)
1cab015a 137
a0457be1 138GDBM is available for Cygwin.
125a13ce 139
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140NOTE: The GDBM library only works on NTFS partitions.
141
f8dbba82 142=item * C<-ldb> (C<use DB_File>)
1cab015a 143
be238d52 144BerkeleyDB is available for Cygwin.
1cab015a 145
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146NOTE: The BerkeleyDB library only completely works on NTFS partitions.
147
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148=item * C<-lcygipc> (C<use IPC::SysV>)
149
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150A port of SysV IPC is available for Cygwin.
151
152NOTE: This has B<not> been extensively tested. In particular,
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153C<d_semctl_semun> is undefined because it fails a Configure test
154and on Win9x the I<shm*()> functions seem to hang. It also creates
155a compile time dependency because F<perl.h> includes F<<sys/ipc.h>>
156and F<<sys/sem.h>> (which will be required in the future when compiling
be238d52 157CPAN modules). CURRENTLY NOT SUPPORTED!
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158
159=item * C<-lutil>
160
161Included with the standard Cygwin netrelease is the inetutils package
162which includes libutil.a.
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163
164=back
165
a83b6f46 166=head2 Configure-time Options for Perl on Cygwin
f8dbba82 167
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168The F<INSTALL> document describes several Configure-time options. Some of
169these will work with Cygwin, others are not yet possible. Also, some of
170these are experimental. You can either select an option when Configure
171prompts you or you can define (undefine) symbols on the command line.
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172
173=over 4
174
175=item * C<-Uusedl>
176
0a110db2 177Undefining this symbol forces Perl to be compiled statically.
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178
179=item * C<-Uusemymalloc>
1cab015a 180
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181By default Perl uses the C<malloc()> included with the Perl source. If you
182want to force Perl to build with the system C<malloc()> undefine this symbol.
1cab015a 183
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184=item * C<-Uuseperlio>
185
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186Undefining this symbol disables the PerlIO abstraction. PerlIO is now the
187default; it is not recommended to disable PerlIO.
33bf3ba1 188
6b49d266 189=item * C<-Dusemultiplicity>
1cab015a 190
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191Multiplicity is required when embedding Perl in a C program and using
192more than one interpreter instance. This works with the Cygwin port.
1cab015a 193
0a110db2 194=item * C<-Duse64bitint>
1cab015a 195
407b02b1 196By default Perl uses 32 bit integers. If you want to use larger 64
be238d52 197bit integers, define this symbol.
1cab015a 198
f8dbba82 199=item * C<-Duselongdouble>
1cab015a 200
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201I<gcc> supports long doubles (12 bytes). However, several additional
202long double math functions are necessary to use them within Perl
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203(I<{atan2, cos, exp, floor, fmod, frexp, isnan, log, modf, pow, sin, sqrt}l,
204strtold>).
f8dbba82 205These are B<not> yet available with Cygwin.
1cab015a 206
f8dbba82 207=item * C<-Dusethreads>
1cab015a 208
27008580 209POSIX threads are implemented in Cygwin, define this symbol if you want
be238d52 210a threaded perl.
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211
212=item * C<-Duselargefiles>
213
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214Cygwin uses 64-bit integers for internal size and position calculations,
215this will be correctly detected and defined by Configure.
1cab015a 216
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217=item * C<-Dmksymlinks>
218
219Use this to build perl outside of the source tree. This works with Cygwin.
538204d5 220Details can be found in the F<INSTALL> document. This is the recommended
bbebedce 221way to build perl from sources.
a0457be1 222
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223=back
224
a83b6f46 225=head2 Suspicious Warnings on Cygwin
1cab015a 226
f8dbba82 227You may see some messages during Configure that seem suspicious.
8736538c 228
f8dbba82 229=over 4
8736538c 230
b4bcd662 231=item * I<dlsym()>
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232
233I<ld2> is needed to build dynamic libraries, but it does not exist
b432a672 234when C<dlsym()> checking occurs (it is not created until C<make> runs).
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235You will see the following message:
236
538204d5 237 Checking whether your C<dlsym()> needs a leading underscore ...
b4bcd662 238 ld2: not found
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239 I can't compile and run the test program.
240 I'm guessing that dlsym doesn't need a leading underscore.
241
242Since the guess is correct, this is not a problem.
243
b4bcd662 244=item * Win9x and C<d_eofnblk>
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245
246Win9x does not correctly report C<EOF> with a non-blocking read on a
247closed pipe. You will see the following messages:
248
249 But it also returns -1 to signal EOF, so be careful!
250 WARNING: you can't distinguish between EOF and no data!
251
252 *** WHOA THERE!!! ***
253 The recommended value for $d_eofnblk on this machine was "define"!
254 Keep the recommended value? [y]
255
256At least for consistency with WinNT, you should keep the recommended
257value.
258
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259=item * Compiler/Preprocessor defines
260
261The following error occurs because of the Cygwin C<#define> of
262C<_LONG_DOUBLE>:
263
264 Guessing which symbols your C compiler and preprocessor define...
fb652349 265 try.c:<line#>: missing binary operator
0a110db2 266
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267This failure does not seem to cause any problems. With older gcc
268versions, "parse error" is reported instead of "missing binary
269operator".
0a110db2 270
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271=back
272
a83b6f46 273=head1 MAKE ON CYGWIN
5aabfad6 274
b4bcd662 275Simply run I<make> and wait:
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276
277 make 2>&1 | tee log.make
278
be238d52 279=head2 Errors on Cygwin
f8dbba82 280
be238d52 281Errors like these are normal:
f8dbba82 282
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283 ...
284 make: [extra.pods] Error 1 (ignored)
285 ...
286 make: [extras.make] Error 1 (ignored)
f8dbba82 287
a83b6f46 288=head2 ld2 on Cygwin
f8dbba82 289
b432a672 290During C<make>, I<ld2> will be created and installed in your $installbin
f8dbba82 291directory (where you said to put public executables). It does not
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292wait until the C<make install> process to install the I<ld2> script,
293this is because the remainder of the C<make> refers to I<ld2> without
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294fully specifying its path and does this from multiple subdirectories.
295The assumption is that $installbin is in your current C<PATH>. If this
b432a672 296is not the case C<make> will fail at some point. If this happens,
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297just manually copy I<ld2> from the source directory to somewhere in
298your C<PATH>.
f8dbba82 299
a83b6f46 300=head1 TEST ON CYGWIN
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301
302There are two steps to running the test suite:
303
304 make test 2>&1 | tee log.make-test
305
306 cd t;./perl harness 2>&1 | tee ../log.harness
307
308The same tests are run both times, but more information is provided when
b432a672 309running as C<./perl harness>.
5aabfad6 310
f8dbba82 311Test results vary depending on your host system and your Cygwin
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312configuration. If a test can pass in some Cygwin setup, it is always
313attempted and explainable test failures are documented. It is possible
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314for Perl to pass all the tests, but it is more likely that some tests
315will fail for one of the reasons listed below.
1cab015a 316
a83b6f46 317=head2 File Permissions on Cygwin
1cab015a 318
f8dbba82 319UNIX file permissions are based on sets of mode bits for
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320{read,write,execute} for each {user,group,other}. By default Cygwin
321only tracks the Win32 read-only attribute represented as the UNIX file
322user write bit (files are always readable, files are executable if they
323have a F<.{com,bat,exe}> extension or begin with C<#!>, directories are
324always readable and executable). On WinNT with the I<ntea> C<CYGWIN>
325setting, the additional mode bits are stored as extended file attributes.
326On WinNT with the I<ntsec> C<CYGWIN> setting, permissions use the standard
327WinNT security descriptors and access control lists. Without one of
47f4f673 328these options, these tests will fail (listing not updated yet):
1cab015a 329
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330 Failed Test List of failed
331 ------------------------------------
332 io/fs.t 5, 7, 9-10
333 lib/anydbm.t 2
334 lib/db-btree.t 20
335 lib/db-hash.t 16
336 lib/db-recno.t 18
337 lib/gdbm.t 2
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338 lib/ndbm.t 2
339 lib/odbm.t 2
340 lib/sdbm.t 2
341 op/stat.t 9, 20 (.tmp not an executable extension)
1cab015a 342
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343=head2 NDBM_File and ODBM_File do not work on FAT filesystems
344
345Do not use NDBM_File or ODBM_File on FAT filesystem. They can be
346built on a FAT filesystem, but many tests will fail:
347
348 ../ext/NDBM_File/ndbm.t 13 3328 71 59 83.10% 1-2 4 16-71
349 ../ext/ODBM_File/odbm.t 255 65280 ?? ?? % ??
350 ../lib/AnyDBM_File.t 2 512 12 2 16.67% 1 4
351 ../lib/Memoize/t/errors.t 0 139 11 5 45.45% 7-11
352 ../lib/Memoize/t/tie_ndbm.t 13 3328 4 4 100.00% 1-4
353 run/fresh_perl.t 97 1 1.03% 91
354
355If you intend to run only on FAT (or if using AnyDBM_File on FAT),
356run Configure with the -Ui_ndbm and -Ui_dbm options to prevent
357NDBM_File and ODBM_File being built.
358
359With NTFS (and CYGWIN=ntsec), there should be no problems even if
360perl was built on FAT.
361
538204d5 362=head2 C<fork()> failures in io_* tests
0be9fa5d 363
538204d5 364A C<fork()> failure may result in the following tests failing:
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365
366 ext/IO/lib/IO/t/io_multihomed.t
367 ext/IO/lib/IO/t/io_sock.t
368 ext/IO/lib/IO/t/io_unix.t
369
370See comment on fork in L<Miscellaneous> below.
0be9fa5d 371
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372=head1 Specific features of the Cygwin port
373
a83b6f46 374=head2 Script Portability on Cygwin
1cab015a 375
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376Cygwin does an outstanding job of providing UNIX-like semantics on top of
377Win32 systems. However, in addition to the items noted above, there are
378some differences that you should know about. This is a very brief guide
379to portability, more information can be found in the Cygwin documentation.
1cab015a 380
f8dbba82 381=over 4
1cab015a 382
f8dbba82 383=item * Pathnames
1cab015a 384
a0457be1 385Cygwin pathnames can be separated by forward (F</>) or backward (F<\\>)
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386slashes. They may also begin with drive letters (F<C:>) or Universal
387Naming Codes (F<//UNC>). DOS device names (F<aux>, F<con>, F<prn>,
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388F<com*>, F<lpt?>, F<nul>) are invalid as base filenames. However, they
389can be used in extensions (e.g., F<hello.aux>). Names may contain all
390printable characters except these:
1cab015a 391
f8dbba82 392 : * ? " < > |
1cab015a 393
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394File names are case insensitive, but case preserving. A pathname that
395contains a backslash or drive letter is a Win32 pathname (and not subject
396to the translations applied to POSIX style pathnames).
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397
398=item * Text/Binary
399
400When a file is opened it is in either text or binary mode. In text mode
5db16f6a 401a file is subject to CR/LF/Ctrl-Z translations. With Cygwin, the default
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402mode for an C<open()> is determined by the mode of the mount that underlies
403the file. Perl provides a C<binmode()> function to set binary mode on files
404that otherwise would be treated as text. C<sysopen()> with the C<O_TEXT>
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405flag sets text mode on files that otherwise would be treated as binary:
406
407 sysopen(FOO, "bar", O_WRONLY|O_CREAT|O_TEXT)
f8dbba82 408
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409C<lseek()>, C<tell()> and C<sysseek()> only work with files opened in binary
410mode.
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411
412The text/binary issue is covered at length in the Cygwin documentation.
f8dbba82 413
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414=item * PerlIO
415
416PerlIO overrides the default Cygwin Text/Binary behaviour. A file will
417always treated as binary, regardless which mode of the mount it lives on,
418just like it is in UNIX. So CR/LF translation needs to be requested in
419either the C<open()> call like this:
420
421 open(FH, ">:crlf", "out.txt");
422
423which will do conversion from LF to CR/LF on the output, or in the
424environment settings (add this to your .bashrc):
425
426 export PERLIO=crlf
427
428which will pull in the crlf PerlIO layer which does LF -> CRLF conversion
429on every output generated by perl.
430
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431=item * F<.exe>
432
538204d5 433The Cygwin C<stat()>, C<lstat()> and C<readlink()> functions make the F<.exe>
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434extension transparent by looking for F<foo.exe> when you ask for F<foo>
435(unless a F<foo> also exists). Cygwin does not require a F<.exe>
436extension, but I<gcc> adds it automatically when building a program.
437However, when accessing an executable as a normal file (e.g., I<cp>
438in a makefile) the F<.exe> is not transparent. The I<install> included
439with Cygwin automatically appends a F<.exe> when necessary.
f8dbba82 440
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441=item * cygwin vs. windows process ids
442
443Cygwin processes have their own pid, which is different from the
444underlying windows pid. Most posix compliant Proc functions expect
445the cygwin pid, but several Win32::Process functions expect the
446winpid. E.g. C<$$> is the cygwin pid of F</usr/bin/perl>, which is not
447the winpid. Use C<Cygwin::winpid_to_pid()> and C<Cygwin::winpid_to_pid()>
448to translate between them.
449
538204d5 450=item * C<chown()>
f8dbba82 451
538204d5 452On WinNT C<chown()> can change a file's user and group IDs. On Win9x C<chown()>
b4bcd662 453is a no-op, although this is appropriate since there is no security model.
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454
455=item * Miscellaneous
456
538204d5 457File locking using the C<F_GETLK> command to C<fcntl()> is a stub that
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458returns C<ENOSYS>.
459
538204d5 460Win9x can not C<rename()> an open file (although WinNT can).
1cab015a 461
538204d5 462The Cygwin C<chroot()> implementation has holes (it can not restrict file
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463access by native Win32 programs).
464
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465Inplace editing C<perl -i> of files doesn't work without doing a backup
466of the file being edited C<perl -i.bak> because of windowish restrictions,
538204d5 467therefore Perl adds the suffix C<.bak> automatically if you use C<perl -i>
27008580 468without specifying a backup extension.
818c4caa 469
538204d5 470Using C<fork()> after loading multiple dlls may fail with an internal cygwin
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471error like the following:
472
473 C:\CYGWIN\BIN\PERL.EXE: *** couldn't allocate memory 0x10000(4128768) for 'C:\CYGWIN\LIB\PERL5\5.6.1\CYGWIN-MULTI\AUTO\SOCKET\SOCKET.DLL' alignment, Win32 error 8
474
475 200 [main] perl 377147 sync_with_child: child -395691(0xB8) died before initialization with status code 0x1
476 1370 [main] perl 377147 sync_with_child: *** child state child loading dlls
477
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478Use the rebase utility to resolve the conflicting dll addresses. The
479rebase package is included in the Cygwin netrelease. Use setup.exe from
538204d5 480F<http://www.cygwin.com/setup.exe> to install it and run rebaseall.
fb652349 481
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482=back
483
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484=head2 Prebuilt methods:
485
486=over 4
487
488=item C<Cwd::cwd>
489
490Returns current working directory.
491
492=item C<Cygwin::pid_to_winpid>
493
494Translates a cygwin pid to the corresponding Windows pid (which may or
495may not be the same).
496
497=item C<Cygwin::winpid_to_pid>
498
499Translates a Windows pid to the corresponding cygwin pid (if any).
500
501=back
502
a83b6f46 503=head1 INSTALL PERL ON CYGWIN
f8dbba82 504
b4bcd662 505This will install Perl, including I<man> pages.
f8dbba82 506
a0457be1 507 make install 2>&1 | tee log.make-install
5db16f6a 508
b432a672 509NOTE: If C<STDERR> is redirected C<make install> will B<not> prompt
5db16f6a 510you to install I<perl> into F</usr/bin>.
1cab015a 511
b432a672 512You may need to be I<Administrator> to run C<make install>. If you
f8dbba82 513are not, you must have write access to the directories in question.
1cab015a 514
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515Information on installing the Perl documentation in HTML format can be
516found in the F<INSTALL> document.
1cab015a 517
a83b6f46 518=head1 MANIFEST ON CYGWIN
1cab015a 519
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520These are the files in the Perl release that contain references to Cygwin.
521These very brief notes attempt to explain the reason for all conditional
522code. Hopefully, keeping this up to date will allow the Cygwin port to
47f4f673 523be kept as clean as possible (listing not updated yet).
1cab015a 524
f8dbba82 525=over 4
1cab015a 526
f8dbba82 527=item Documentation
1cab015a 528
47dafe4d 529 INSTALL README.cygwin README.win32 MANIFEST
5d129265 530 Changes Changes5.005 Changes5.004 Changes5.6
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531 pod/perl.pod pod/perlport.pod pod/perlfaq3.pod
532 pod/perldelta.pod pod/perl5004delta.pod pod/perl56delta.pod
9f7e07ec 533 pod/perlhist.pod pod/perlmodlib.pod perl/buildtoc pod/perltoc.pod
1cab015a 534
f8dbba82 535=item Build, Configure, Make, Install
1cab015a 536
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537 cygwin/Makefile.SHs
538 cygwin/ld2.in
539 cygwin/perlld.in
540 ext/IPC/SysV/hints/cygwin.pl
541 ext/NDBM_File/hints/cygwin.pl
542 ext/ODBM_File/hints/cygwin.pl
543 hints/cygwin.sh
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544 Configure - help finding hints from uname,
545 shared libperl required for dynamic loading
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546 Makefile.SH - linklibperl
547 Porting/patchls - cygwin in port list
f8dbba82 548 installman - man pages with :: translated to .
5db16f6a 549 installperl - install dll/ld2/perlld, install to pods
6b49d266 550 makedepend.SH - uwinfix
1cab015a 551
f8dbba82 552=item Tests
1cab015a 553
f8dbba82 554 t/io/tell.t - binmode
5d129265 555 t/lib/b.t - ignore Cwd from os_extras
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556 t/lib/glob-basic.t - Win32 directory list access differs from read mode
557 t/op/magic.t - $^X/symlink WORKAROUND, s/.exe//
558 t/op/stat.t - no /dev, skip Win32 ftCreationTime quirk
559 (cache manager sometimes preserves ctime of file
560 previously created and deleted), no -u (setuid)
75e109ec 561 t/lib/cygwin.t - builtin cygwin function tests
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562
563=item Compiled Perl Source
564
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565 EXTERN.h - __declspec(dllimport)
566 XSUB.h - __declspec(dllexport)
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567 cygwin/cygwin.c - os_extras (getcwd, spawn, Cygwin::winpid_to_pid,
568 Cygwin::pid_to_winpid)
6b49d266 569 perl.c - os_extras
f8dbba82 570 perl.h - binmode
6b49d266 571 doio.c - win9x can not rename a file when it is open
b4bcd662 572 pp_sys.c - do not define h_errno, pp_system with spawn
47dafe4d 573 util.c - use setenv
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574
575=item Compiled Module Source
576
577 ext/POSIX/POSIX.xs - tzname defined externally
578 ext/SDBM_File/sdbm/pair.c
579 - EXTCONST needs to be redefined from EXTERN.h
580 ext/SDBM_File/sdbm/sdbm.c
581 - binary open
582
583=item Perl Modules/Scripts
584
6b49d266 585 lib/Cwd.pm - hook to internal Cwd::cwd
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586 lib/ExtUtils/MakeMaker.pm
587 - require MM_Cygwin.pm
588 lib/ExtUtils/MM_Cygwin.pm
589 - canonpath, cflags, manifypods, perl_archive
497711e7 590 lib/File/Find.pm - on remote drives stat() always sets st_nlink to 1
6b49d266 591 lib/File/Spec/Unix.pm - preserve //unc
5d129265 592 lib/File/Temp.pm - no directory sticky bit
6b49d266 593 lib/perl5db.pl - use stdin not /dev/tty
6b49d266 594 utils/perldoc.PL - version comment
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595
596=back
f89d6eaa 597
a83b6f46 598=head1 BUGS ON CYGWIN
f8dbba82 599
125a13ce 600Support for swapping real and effective user and group IDs is incomplete.
538204d5 601On WinNT Cygwin provides C<setuid()>, C<seteuid()>, C<setgid()> and C<setegid()>.
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602However, additional Cygwin calls for manipulating WinNT access tokens
603and security contexts are required.
604
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605=head1 AUTHORS
606
b4bcd662 607Charles Wilson <cwilson@ece.gatech.edu>,
47dafe4d 608Eric Fifer <egf7@columbia.edu>,
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609alexander smishlajev <als@turnhere.com>,
610Steven Morlock <newspost@morlock.net>,
611Sebastien Barre <Sebastien.Barre@utc.fr>,
a0457be1 612Teun Burgers <burgers@ecn.nl>,
27008580 613Gerrit P. Haase <gp@familiehaase.de>.
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614
615=head1 HISTORY
616
75e109ec 617Last updated: 2005-02-11