Description:
------------
According to cygwin-patches(*1) and ChangeLog(*2), Cygwin's usleep now advances system clock(gettimeofday).
*1 .. http://sources.redhat.com/ml/cygwin-patches/2003-q3/msg00178.html
*2 .. http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/winsup/cygwin/signal.cc?cvsroot=src#rev1.48

Therefore I can use uniqid safely when more entropy flag is zero, I made a patch. (but "more entropy flag" is still on by default for backward compatibility)
Unfortunary cygwin doesn't change version for this change, I apply most recent change of CYGWIN_VERSION_API_MINOR.

"String functions [tests/strings/001.phpt]" now pass!

--- php-4.3.5RC2/ext/standard/uniqid.c.orig	2003-01-01 01:35:35.000000000 +0900
+++ php-4.3.5RC2/ext/standard/uniqid.c	2004-02-08 13:01:49.006220800 +0900
@@ -34,6 +34,9 @@
 #else
 #include <sys/time.h>
 #endif
+#if defined(__CYGWIN__)
+#include <cygwin/version.h>
+#endif
 
 #include "php_lcg.h"
 #include "uniqid.h"
@@ -66,7 +69,7 @@
 	}
 #if HAVE_USLEEP && !defined(PHP_WIN32)
 	if (!more_entropy) {
-#if defined(__CYGWIN__)
+#if defined(__CYGWIN__) && (CYGWIN_VERSION_API_MINOR < 91)
 		php_error_docref(NULL TSRMLS_CC, E_ERROR, "You must use 'more entropy' under CYGWIN.");
 		return;
 #else
--- php-4.3.5RC2/tests/strings/001.phpt.orig	2001-03-21 21:47:46.000000000 +0900
+++ php-4.3.5RC2/tests/strings/001.phpt	2004-02-08 13:23:53.320491200 +0900
@@ -181,8 +181,8 @@
 
 echo "Testing uniqid: ";
 $str = "prefix";
-$ui1 = uniqid($str);
-$ui2 = uniqid($str);
+$ui1 = uniqid($str, 0);
+$ui2 = uniqid($str, 0);
 if (strlen($ui1) == strlen($ui2) && strlen($ui1) == 19 && $ui1 != $ui2) {
 	echo("passed\n");
 } else {


Reproduce code:
---------------
<?php
echo uniqid("prefix"),"\n";
echo uniqid("prefix", 1),"\n";
echo uniqid("prefix", 0),"\n";
echo uniqid("prefix", 0),"\n";
echo uniqid("prefix", 0),"\n";
?>

Expected result:
----------------
-- cygwin --
prefix4025c46680d100.85790027
prefix4025c466810f81.04902838
prefix4025c466814e0
prefix4025c466818c8
prefix4025c46681cb0
-- linux --
prefix4025c4a472847
prefix4025c4a47289a3.07476264
prefix4025c4a47766a
prefix4025c4a47c487
prefix4025c4a4812a8


Actual result:
--------------
-- cygwin(NG) --
PHP Fatal error:  uniqid(): You must use 'more entropy' under CYGWIN. in /home/sagawa/uniqid_test.php on line 4
prefix4025c46680d100.85790027
prefix4025c466810f81.04902838
-- linux(OK) --
prefix4025c4a472847
prefix4025c4a47289a3.07476264
prefix4025c4a47766a
prefix4025c4a47c487
prefix4025c4a4812a8