Re: [LIP] how to find boot loader installed on m/c ? - LILO/grub?

Thank Binand ,

Any explanation why lseek to offset 6,  can same thing be used for grub 
loader entries at that location??

Thanks,
Ritesh B

Binand Sethumadhavan wrote:

>On Thu, Nov 06, 2003 at 05:39:51PM +0530, Ritesh Bharati wrote:
>  
>
>>hi,
>>On my m/c  (fedora test3) i have both rpm packages installed, so rpm -qa 
>>witll not help. But yes i have /etc/lilo.conf.anaconda file and my 
>>bootloader is grub.
>>This test might do. Is any other way?? Any entry in MBR ..:).
>>    
>>
>
>Sigh. On a programming list, a program solution.
>
>This program seems to detect all LILO installations for me. I don't have
>a GRUB installation to check, however.
>
>Usage:
>
>1. Save the code into bootloader.c
>2. Compile it - make bootloader
>3. Run it - ./bootloader /dev/hda (use your disk here)
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <fcntl.h>
>
>int main(int argc, char **argv) {
>	char *dev = argv[1];
>	char buf[4];
>	int fd;
>	fd = open (dev, O_RDONLY);
>	if (fd < 0) {
>		perror ("open");
>		exit (1);
>	}
>	if (lseek (fd, 6, SEEK_SET) < 0) {
>		perror ("lseek");
>		exit (1);
>	}
>	if (read (fd, buf, 4) != 4) {
>		perror ("read");
>		exit (1);
>	}
>	if (buf[0] == 0x4c && buf[1] == 0x49 && buf[2] == 0x4c && buf[3] == 0x4f) {
>		printf ("Boot Loader is LILO\n");
>	} else {
>		printf ("Other Boot Loader - Possibly Grub\n");
>	}
>	close(fd);
>	return 0;
>}
>
>Binand
>
>PS: How did I know? I ran xxd /dev/hda and looked for tell-tale signs.
>
>  
>




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