why lockf is failing

[Ajay Bansal]

I know that i missing something very stupid in the following program...
but what is it??
 
 
 
"open.cpp" 23 lines, 428 characters 
 
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <iostream.h>
using namespace std;
 
int main()
{
    int fd;
 
    fd = open("/home/hpux/ajay/project/Testing/sti-test/ajay", 0);     
    cout<<"File descriptor we got is "<<fd<<endl;
 
   lockf(fd, F_LOCK, 0);
   cout<<"Error no is "<<errno<<" & dscription is
"<<strerror(errno)<<endl;
 
    return 1;
}
 
$g++ open.cpp
$ ./a.out 
File descriptor we got is 3
Error no is Bad file descriptor & dscription is 9
 
 
Does this mean that we can not have lock on a file which has been opeed
only for reading?????
 
TIA (Thanks in Advance)
Ajay
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