cygwin port

To: "'perl5-porters@perl.org'" <perl5-porters@perl.org>
Message-ID: <779F20BCCE5AD31186A50008C75D99791716E1@SILLDN_MAIL1>

p4raw-id: //depot/cfgperl@5241

1 files changed, 62 insertions, 43 deletions

diff --git a/README.cygwin b/README.cygwin
index ab60a58a0a..5a0be88230 100644
--- a/README.cygwin
+++ b/README.cygwin
@@ -134,7 +134,7 @@ binaries to be stripped, you can either add a B<-s> option when Configure
 prompts you,
 
   Any additional ld flags (NOT including libraries)? [none] -s
-  Any special flags to pass to gcc to use dynamic loading? [none] -s
+  Any special flags to pass to gcc to use dynamic linking? [none] -s
   Any special flags to pass to ld2 to create a dynamically loaded library?
   [none] -s
 
@@ -155,7 +155,7 @@ C<http://cygutils.netpedia.net/>.
 
 The crypt libraries in GNU libc have been ported to Cygwin.
 
-The DES based Ultra Fast Crypt port was done by Alexey Truhan
+The DES based Ultra Fast Crypt port was done by Alexey Truhan:
 
   http://dome.weeg.uiowa.edu/pub/domestic/sos/cw32crypt-dist-0.tgz
 
@@ -183,12 +183,9 @@ F<ext/DB_File/DB_File.pm>.
 
 =item * C<-lcygipc> (C<use IPC::SysV>)
 
-A port of SysV IPC is available for Cygwin:
-
-  http://www.multione.capgemini.fr/tools/pack_ipc/
-
-The 1.3 release does not include ftok(), but code for ftok() can be
-borrowed from glibc.
+A port of SysV IPC is available for Cygwin.  It has not been extensively
+tested.  In particular, C<d_semctl_semun> does not configure properly
+because the configure test fails and on Win9x the shm*() functions hang.
 
 =back
 
@@ -222,17 +219,17 @@ more than one interpreter instance.  This works with the Cygwin port.
 
 The PerlIO abstraction works with the Cygwin port.
 
-=item * C<-Duse64bits -Duselonglong>
+=item * C<-Duse64bits>
 
 I<gcc> supports 64-bit integers.  However, several additional long long
-functions are necessary to use them within Perl (I<{atol,strtoul}l>).
+functions are necessary to use them within Perl (I<{strtol,strtoul}l>).
 These are B<not> yet available with Cygwin.
 
 =item * C<-Duselongdouble>
 
 I<gcc> supports long doubles (12 bytes).  However, several additional
 long double math functions are necessary to use them within Perl
-(I<{sqrt,pow,atan2,exp,fmod,log,cos,frexp,sin,floor,modf,atof}l>).
+(I<{atan2,cos,exp,floor,fmod,frexp,log,modf,pow,sin,sqrt}l,strtold>).
 These are B<not> yet available with Cygwin.
 
 =item * C<-Dusethreads>
@@ -242,7 +239,7 @@ POSIX threads are B<not> yet implemented in Cygwin.
 =item * C<-Duselargefiles>
 
 Although Win32 supports large files, Cygwin currently uses 32-bit ints
-for internal size and positional calculations.
+for internal size and position calculations.
 
 =back
 
@@ -265,6 +262,21 @@ hint file.
 
 You should keep the recommended value.
 
+=item * Win9x and d_eofnblk
+
+Win9x does not correctly report C<EOF> with a non-blocking read on a
+closed pipe.  You will see the following messages:
+
+  But it also returns -1 to signal EOF, so be careful!
+  WARNING: you can't distinguish between EOF and no data!
+
+  *** WHOA THERE!!! ***
+      The recommended value for $d_eofnblk on this machine was "define"!
+      Keep the recommended value? [y]
+
+At least for consistency with WinNT, you should keep the recommended
+value.
+
 =item * Checking how std your stdio is...
 
 Configure reports:
@@ -273,6 +285,8 @@ Configure reports:
 
 This is correct.
 
+=back
+
 =head1 MAKE
 
 Simply run make and wait:
@@ -313,8 +327,8 @@ The same tests are run both times, but more information is provided when
 running as `C<./perl harness>'.
 
 Test results vary depending on your host system and your Cygwin
-configuration.  It is possible that Cygwin will pass all the tests, but it
-is more likely that some tests will fail for one of the the reasons below.
+configuration.  It is possible that Cygwin will pass all the tests,
+but it is more likely that some tests will fail for one of these reasons.
 
 =head2 File Permissions
 
@@ -337,7 +351,6 @@ options, these tests will fail:
   lib/db-hash.t         16
   lib/db-recno.t        18
   lib/gdbm.t            2
-  lib/glob-basic.t      9 (directory always readable)
   lib/ndbm.t            2
   lib/odbm.t            2
   lib/sdbm.t            2
@@ -391,7 +404,7 @@ directories (although, this is B<not> recommended).
 
 =head2 /etc/group
 
-Cygwin does not need F</etc/group>, in which case the F<op/grent.t>
+Cygwin does not require F</etc/group>, in which case the F<op/grent.t>
 test will be skipped.  The check performed by F<op/grent.t> expects to
 see entries that use the members field, otherwise this test will fail:
 
@@ -401,18 +414,17 @@ see entries that use the members field, otherwise this test will fail:
 
 =head2 Unexplained Failures
 
-Any additional tests that fail are likely due to bugs in Cygwin.  It is
-expected that by the time of the next net release most of these will
-be solved so they are not described here.  None of the current bugs are
-serious enough that workarounds are needed.
+Any additional tests that fail are likely due to bugs in Cygwin or the
+optional libraries.  It is expected that by the time of the next net
+release most of these will be solved so they are not described here.
 
 =head2 Script Portability
 
-Cygwin does an outstanding job of providing UNIX-like semantics on top
-of Win32 systems.  However, in addition to the items noted above, there
-are some differences that you should know about.  This is only a very
-brief guide to portability, more information about Cygwin can be found
-in the Cygwin documentation.
+Cygwin does an outstanding job of providing UNIX-like semantics on
+top of Win32 systems.  However, in addition to the items noted above,
+there are some differences that you should know about.  This is only a
+very brief guide to portability, more information can be found in the
+Cygwin documentation.
 
 =over 4
 
@@ -439,15 +451,17 @@ F<cygwin1.dll> provided by Sergey Okhapkin at:
 =item * Text/Binary
 
 When a file is opened it is in either text or binary mode.  In text mode
-it is subject to CR/LF/Ctrl-Z translations.  Perl provides a binmode()
-function to force binary mode on files that otherwise would be treated
-as text.  With Cygwin, the default mode for an open() is determined by the
-mode of the mount that underlies a file.  For binmode() to be effective,
-the underlying mount must be text.  There is no way to force text mode
-on a file underneath a binary mount.  The text/binary issue is covered
-at length in the Cygwin documentation.
+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.  Perl provides a binmode() function to set binary mode on files
+that otherwise would be treated as text.  sysopen() with the C<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() only works with files opened in binary mode.
+lseek(), tell() and sysseek() only work with files opened in binary mode.
+
+The text/binary issue is covered at length in the Cygwin documentation.
 
 =item * F<.exe>
 
@@ -458,8 +472,8 @@ automatically when building a program.  However, when accessing an
 executable as a normal file (e.g., I<install> or I<cp> in a makefile)
 the F<.exe> is not transparent.
 
-NOTE: There is a version of I<install> that understands F<.exe>, it can
-be found at:
+NOTE: There is a version of I<install> that understands the F<.exe>
+semantics, it can be found at:
 
   ftp://ftp.franken.de/pub/win32/develop/gnuwin32/cygwin/porters/Humblet_Pierre_A/
 
@@ -474,8 +488,6 @@ although this is appropriate on Win9x since there is no security model.
 File locking using the C<F_GETLK> command to fcntl() is a stub that
 returns C<ENOSYS>.
 
-Win32 can not unlink() an open file (but this is emulated by Cygwin).
-
 Win9x can not rename() an open file (although WinNT can).
 
 =back
@@ -484,7 +496,10 @@ Win9x can not rename() an open file (although WinNT can).
 
 This will install Perl, including man pages.
 
-  make install 2>&1 | tee log.make-install
+  make install | tee log.make-install
+
+NOTE: If C<STDERR> is redirected `C<make install>' will B<not> prompt
+you to install I<perl> into F</usr/bin>.
 
 You may need to be I<Administrator> to run `C<make install>'.  If you
 are not, you must have write access to the directories in question.
@@ -520,21 +535,25 @@ be kept as clean as possible.
   ext/ODBM_File/hints/cygwin.pl
   hints/cygwin.sh
   Porting/patchls       - cygwin in port list
-  Makefile.SH           - linklibperl, cygwin/Makefile.SHs
+  Makefile.SH           - linklibperl
   makedepend.SH         - uwinfix
   Configure             - help finding hints from uname,
                           shared libperl required for dynamic loading
   installman            - man pages with :: translated to .
-  installperl           - install dll, install to pods
+  installperl           - install dll/ld2/perlld, install to pods
 
 =item Tests
 
   t/io/tell.t           - binmode
-  t/op/magic.t          - $^X WORKAROUND, s/.exe//
-  t/op/stat.t           - no /dev, no -u (setuid)
+  t/lib/glob-basic.t    - Win32 directory list access differs from read mode
+  t/op/magic.t          - $^X/symlink WORKAROUND, s/.exe//
+  t/op/stat.t           - no /dev, skip Win32 ftCreationTime quirk
+                          (cache manager sometimes preserves ctime of file
+                          previously created and deleted), no -u (setuid)
 
 =item Compiled Perl Source
 
+  cygwin/cygwin.c       - os_extras (getcwd)
   doio.c                - win9x can not rename a file when it is open
   EXTERN.h              - __declspec(dllimport)
   XSUB.h                - __declspec(dllexport)
@@ -587,4 +606,4 @@ Teun Burgers E<lt>burgers@ecn.nlE<gt>.
 
 =head1 HISTORY
 
-Last updated: 28 January 2000
+Last updated: 24 February 2000