Re: not able to get fd of ofstream using stdio_filebuf

[James Kanze]

Ulrich Eckhardt wrote:
> Devika wrote:

>>I want to call fcntl function for which I need fd(). The code
>>part is smthing like :

>>ofstream osf("somefile" , ios::app);

>>filebuf * fb ;
>>fb = osf.rdbuf();

>>fcntl(fb -> fd(), F_SETLKW, &cfLock);

>>Now this code was working fine with gcc 2.96 but now it[gcc
>>3.2.3] says no matching function for fd() since the function
>>fd() of basic_filebuf has been removed in gcc 3.2.3. and they
>>have provided new extension stdio_filebuf.

> 1. http://gcc.gnu.org/gcc-2.96.html
> 2. access to underlying filedescriptors was never part of C++
> iostreams, although GCC's C++ stdlibrary provided means for
> that.

That's not really true.  Access to underlying file descriptors
was part of the original classical iostream.  The standard
didn't endorse it because not all systems have such a thing, but
it seems obvious that no serious compiler purveyor will want to
break existing code, especially when such code was compatible
with the previous existing practice.

--
James Kanze                                 mailto: james.kanze@free.fr
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