Direct file access in C++? -

are there way write directly disk without cache in c++? using:

int open(fileout, o_create | o_wronly | o_direct);   file *fh = fdopen(fileout_dev, "wb"); 

are there cross platform libraries allowing that?

thanks arman.

if you're talking buffering, can use setbuf or setvbuf

/* setbuf example */ #include <stdio.h>  int main () {   char buffer[bufsiz];   file *pfile1, *pfile2;    pfile1=fopen ("myfile.txt","w");   pfile2=fopen ("myfile2.txt","a");    setbuf ( pfile1 , buffer );   fputs ("this sent buffered stream",pfile1);   fflush (pfile1);    setbuf ( pfile2 , null );   fputs ("this sent unbuffered stream",pfile2);    fclose (pfile1);   fclose (pfile2);    return 0; }   /* setvbuf example */ #include <stdio.h>  int main () {   file *pfile;    pfile=fopen ("myfile.txt","w");    // _ionbf disables buffering   setvbuf (pfile , null , _ionbf, 0);    // file operations here    fclose (pfile);    return 0; }