writing on boot sector

[zak100]

Hi,
I have got a 'C' laguage to write on boot sector. When I excute it, nothing
happens and the disk data remains the same. On the other hand assembly
language version is wroking fine. Can somebody help me plz:


#include  /* unistd.h needs this */
#include     /* contains read/write */
#include 

int main()
{
        char boot_buf[512];
        int floppy_desc, file_desc;
 
        
        file_desc = open("./boot", O_RDONLY);
        read(file_desc, boot_buf, 510);
        close(file_desc);
        
        boot_buf[510] = 0x55;
        boot_buf[511] = 0xaa;

        floppy_desc = open("/dev/fd0", O_RDWR);
        lseek(floppy_desc, 0, SEEK_CUR);
        write(floppy_desc, boot_buf, 512);
        close(floppy_desc);
}

I am working on windows XP and I am using gcc compiler:MinGW-5.1.4
Zulfi.
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