_set_fmode?

Corinna Vinschen corinna-cygwin@cygwin.com
Wed Mar 18 12:03:00 GMT 2009


On Mar 18 10:43, Corinna Vinschen wrote:
> On Mar 17 21:15, Charles Wilson wrote:
> > Is there a cygwin analogue to the msvc _set_fmode()? That is, a function
> > that sets the default mode of fopen, even if you don't explicitly
> > specify it "rb" or whatever.
> > 
> > Obviously, there's "use binary (or text) mounts".  Less obviously, you
> > can link against /usr/lib/binary.o (or -lbinmode), or text.o (or
> > automode.o or textreadmode.o and the similar .a's).  But I'm looking for
> > an actual function call to replace the following code in libarchive:
> > [...]
> > I'm using binmode.o at present, but I'd prefer to just make a func call
> > at the same place the WIN32-specific code does.  (FWIW, you can't call
> > the w32api _set_fmode() function and expect it to work; the msvc runtime
> > and cygwin maintain different default _fmode variables).
> 
> Cygwin has no such function call except for the per-descriptor function
> setmode (fd, mode).  IMHO using binmode.o is much more elegant.  The
> only other choice you have is this:
> 
>   extern int _fmode;
>   _fmode = O_BINARY;
> 
> _fmode is defined in crt0.o so you can simply access it if you like.
> But anyway, using binmode.o is much more elegant, IMHO.  I don't see
> what speaks against using it.

Btw., it looks like the binmode/textmode documentation in the Cygwin 1.7
user's guide still needs a lot of rework.  Sigh.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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