#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>

static void stest ( ) {
	int f = open ( "/tmp/synctest2", O_WRONLY | O_CREAT, 0666 );
	if ( f < 0 )
		perror ( "fopen" );
	char s [ ] = "SYNC TEST\nSYNC TEST\n";
	if ( write ( f, s, sizeof ( s ) - 1 ) < 0 )
		perror ( "write" );
	if ( fsync ( f ) )
		perror ( "fsync" );
	if ( close ( f ) )
		perror ( "close" );
	if ( rename ( "/tmp/synctest2", "/tmp/synctest" ) )
		perror ( "rename" );
}
int main ( ) {
	while ( true )
		stest ( );
	return 0;
}