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Date: Mon, 27 Dec 1999 11:47:32 -0800 (PST)
From: Alexandre Jose Reis Santoro <santoro@anna.stanford.edu>
Reply-To: Alexandre Jose Reis Santoro <santoro@anna.stanford.edu>
To: cygwin@sourceware.cygnus.com
Subject: mmap problems
Message-ID: <Pine.LNX.3.96.991223111452.17971B-100000@gavea.Stanford.EDU>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

The following mmap call works on both Linux and Solaris, but fails on
cygwin-NT:

      caddr_t p = NULL;
      if ((p = mmap(0, 
                    8192,
                    PROT_READ | PROT_WRITE,
                    MAP_SHARED,
                    m_fd,
                    (bn * 8192))) == MAP_FAILED)
      {
         fprintf(stderr, "DBFile1::getBlock - mmap failed : %d\n", errno);
         exit(1); //@@ errno set -- handle errors
      }

In the cygwin-NT case, mmap works properly if the offset value (given by
bn*8192) is 0, but fails otherwise with EACCESS.

Has anyone encountered this problem before? Does anyone know what is
happening?

Any help would be appreciated,

- Alex Santoro (santoro@poset.stanford.edu)


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