Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com Date: Sun, 12 Nov 2000 16:52:47 -0500 Message-Id: <200011122152.QAA14305@envy.delorie.com> X-Authentication-Warning: envy.delorie.com: dj set sender to dj@envy.delorie.com using -f From: DJ Delorie To: cygwin@cygwin.com In-reply-to: <20001112131900.A29324@redhat.com> (message from Christopher Faylor on Sun, 12 Nov 2000 13:19:00 -0500) Subject: Re: Updated: Cygwin 1.1.5-7 References: <200011120904.KAA19949@madrid.cdc.u-cergy.fr> <20001112131900.A29324@redhat.com> > >How can we read this `magic number' ? > > Huh? Use 'read()', I guess. Is this a trick question? It is if you don't know where or what to read. Here are some details: open the file in binary mode. Read the first two characters. If they are "MZ" or "ZM" then you have an MS-DOS executable. One of the fields in the DOS header has a pointer to a *second* magic number. If this second magic number is "PE\0\0" then you have a 32-bit Windows executable. If you need more information than that, look up Ralf Brown's interrupt list, which details all the executable header types. -- Want to unsubscribe from this list? Send a message to cygwin-unsubscribe@sourceware.cygnus.com