From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Graegert Subject: Re: Forcing fsync() using an ouput stream in C++ Date: Thu, 3 Mar 2005 09:15:00 +0100 Message-ID: <6a00c8d50503030015237d9844@mail.gmail.com> References: <7728232c05030222384c65f341@mail.gmail.com> Reply-To: Steve Graegert Mime-Version: 1.0 Content-Transfer-Encoding: 7bit In-Reply-To: <7728232c05030222384c65f341@mail.gmail.com> Sender: linux-c-programming-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-c-programming@vger.kernel.org Cc: Hareesh Nagarajan On Thu, 3 Mar 2005 00:38:10 -0600, Hareesh Nagarajan wrote: > Hi, > > I am aware this is a C-programming mailing list. I just thought I > might get some useful inputs from this ML. > > My problem is that I haven't figured out how I must fsync an output > stream (in C++) even after reading the contents of this link: > http://gcc.gnu.org/ml/gcc-help/2004-02/msg00285.html > > How must I modify this method (this method doesn't work; it prints the > error message and exits!) ? > > void logRecovery::syncToDisk(fstream& f) > { > unix_filebuf_t* buf; > buf = dynamic_cast(f.rdbuf()); > if (buf == NULL) { > cerr << "Fatal: Don't know fd of stream" << endl; > exit(-1); > } > > fsync(buf->fd()); > } > > I am using GCC 3.3.4. > > Thanks, > > Hareesh > - > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > I have actually now idea why you are using unix_filebuf_t. Why not simply call f.flush()? If you need to obtain a reference to the streambuf object associated with a stream you can call f.readbuf() and then do a sync, like this: streambuf *buf; buf = f.readbuf(); buf->sync(); May be I get you wrong, but hope this helps. -- Kind Regards \Steve