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.
> #include <ext/stdio_filebuf.h>
> typedef __gnu_cxx::stdio_filebuf FILEBUF;
>
> ofstream osf("somefile" , ios::app);
> FILEBUF *fb ;
> fb = dynamic_cast<FILEBUF *>(osf.rdbuf());
>
> ...But its not getting typecasted properly and i m getting segment
> fault.
What do you mean it is not getting typecasted properly? Are you aware of
the semantics of dynamic_cast?
Anyhow, I can see two solutions:
1. there is a complementary to stdio_filebuf which is a stream that you
should use instead of plain std::ofstream.
2. you could instantiate stdio_filebuf directly and pass a pointer to an
ostream's ctor. Above assumed stdio_ofstream is probably nothing
different, just that it wraps things up nicely.
BTW, did you even bother reading the intended topic of gnu.gcc.help? Shame
no you.
Uli
--
http://gcc.gnu.org/faq.html
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