X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type; q=dns; s=default; b=uxEOfB
	xz8iyqGOiyTjf5llQKl3rPAJIVTnAWPdK7/SH2Nmqge1txFLA5AuDgb3hHvx3HU/
	JrIzAHfs4dQTrVlwjlJgAY6bSGD6oSvBpInqfvZZmQHFcnqr/HN1A24du8ZbEfu8
	vTwE9bRuKIMrjvw8geZe33Em6htWH5Fs0C9cU=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type; s=default; bh=TD2V/MqPjntW
	aIIvxPlCcpndjBk=; b=fS/pV6JQlyHVsE4TBCJDaUV9C1P/y4nT7n+JbFenaGNk
	1h37xIrSilPGpRpS6mRqotqgjsZkwKGCLwifguO80t/UBRAVywmNOCyauFWiSQSI
	TpjkunW3uEAfc+g4rSVDRUFKXl5Nk4lV/tffWedg0fAQsuRvI8kIcK2dFgov324=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-1.7 required=5.0 tests=AWL,BAYES_00,RP_MATCHES_RCVD,SPF_PASS autolearn=ham version=3.3.2
X-HELO:	limerock02.mail.cornell.edu
X-CornellRouted:	This message has been Routed already.
Message-ID:	<53136870.200@cornell.edu>
Date:	Sun, 02 Mar 2014 12:20:48 -0500
From:	Ken Brown <kbrown AT cornell DOT edu>
User-Agent:	Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0
MIME-Version:	1.0
To:	cygwin AT cygwin DOT com
Subject:	Re: Building libsigsegv on Cygwin64
References:	<530771A3 DOT 7000603 AT alice DOT it>
In-Reply-To:	<530771A3.7000603@alice.it>
X-IsSubscribed:	yes

--------------030601000304020509080304
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: 7bit

On 2/21/2014 10:32 AM, Angelo Graziosi wrote:
> Trying to build libsigsegv-2.10 on Cygwin64 (using the src tarball and
> its .cygport file from x86 distribution), fails as follows
>
> [...]
> libtool: compile:  gcc -DHAVE_CONFIG_H -I.
> -I/works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10/src -I.. -I.
> -I/works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10/src -ggdb -O2 -pipe
> -Wimplicit-function-declaration
> -fdebug-prefix-map=/works/tmp/libsigsegv-2.10-1/build=/usr/src/debug/libsigsegv-2.10-1
> -fdebug-prefix-map=/works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10=/usr/src/debug/libsigsegv-2.10-1
> -c /works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10/src/handler.c
> -DDLL_EXPORT -DPIC -o .libs/handler.o
> In file included from
> /works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10/src/handler.c:20:0:
> /works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10/src/handler-win32.c: In
> function 'main_exception_filter':
> /works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10/src/handler-win32.c:218:43:
> error: 'struct _CONTEXT' has no member named 'Esp'
>                 ExceptionInfo->ContextRecord->Esp = new_safe_esp;
>                                             ^
> /works/tmp/libsigsegv-2.10-1/src/libsigsegv-2.10/src/handler-win32.c:220:43:
> error: 'struct _CONTEXT' has no member named 'Eip'
>                 ExceptionInfo->ContextRecord->Eip = (unsigned
> long)&stack_overflow_handler;
>                                             ^
> Makefile:399: set di istruzioni per l'obiettivo "handler.lo" non riuscito
> make[1]: *** [handler.lo] Errore 1
> make[1]: uscita dalla directory "/works/tmp/libsigsegv-2.10-1/build/src"
> Makefile:344: set di istruzioni per l'obiettivo "install-recursive" non
> riuscito
> make: *** [install-recursive] Errore 1
>
> Since my Cygwin64 is a fesh installation, I wonder if I missed to
> installe some needed packages... or is that error to be expected on
> Cygwin64?

I found the problem (or at least I found *a* problem):  There's a 
configure test "checking whether a fault handler according to POSIX 
works", which passes on 32-bit Cygwin but fails on 64-bit Cygwin.  I'm 
attaching a file containing the configure test.  Here's what happens in 
the 64-bit case:

$ gcc -o fault fault.c
$ ./fault.exe
$ echo $?
1

In the 32-bit case, the exit code is 0.

I don't know if this indicates a Cygwin bug or something wrong with the 
test.

Ken

--------------030601000304020509080304
Content-Type: text/plain; charset=windows-1252;
 name="fault.c"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="fault.c"

#include <stdlib.h>
#include <signal.h>
#include <sys/signal.h>
#include <sys/types.h>
#include <sys/mman.h>
# include <fcntl.h>

# define zero_fd -1
# define map_flags MAP_ANON | MAP_PRIVATE
# define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS 0UL

unsigned long page;
int handler_called = 0;

void sigsegv_handler (int sig, siginfo_t *sip, void *ucp)
{
  void *fault_address = (void *) (sip->si_addr);
  handler_called++;
  if (handler_called == 10)
    exit (4);
  if (fault_address
      != (void*)((page + 0x678) & ~SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS))
    exit (3);
  if (mprotect ((void *) page, 0x10000, PROT_READ | PROT_WRITE) < 0)
    exit (2);
}

void crasher (unsigned long p)
{
  *(int *) (p + 0x678) = 42;
}

int main ()
{
  void *p;
  struct sigaction action;
  /* Preparations.  */
  /* Setup some mmaped memory.  */
  p = mmap ((void *) 0x12340000, 0x10000, PROT_READ | PROT_WRITE, map_flags, zero_fd, 0);
  if (p == (void *)(-1))
    exit (2);
  page = (unsigned long) p;
  /* Make it read-only.  */
  if (mprotect ((void *) page, 0x10000, PROT_READ) < 0)
    exit (2);
  /* Install the SIGSEGV handler.  */
  sigemptyset(&action.sa_mask);
  action.sa_sigaction = &sigsegv_handler;
  action.sa_flags = SA_SIGINFO;
  sigaction (SIGSEGV, &action, (struct sigaction *) NULL);
  sigaction (SIGBUS, &action, (struct sigaction *) NULL);
  /* The first write access should invoke the handler and then complete.  */
  crasher (page);
  /* The second write access should not invoke the handler.  */
  crasher (page);
  /* Check that the handler was called only once.  */
  if (handler_called != 1)
    exit (1);
  /* Test passed!  */
  return 0;
}


--------------030601000304020509080304
Content-Type: text/plain; charset=us-ascii

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
--------------030601000304020509080304--

- Raw text -