[smartmontools-support] Read selftest-log via SMART_READ_LOG_SECTOR

[<bb...@bo...>]

Hi ,
I am writing to you because, you are a guru in those topics ;)
I tried read self-test log from my hdd  but I do not receive any sense 
information ;/

My code looks like this:

#include <sys/ioctl.h>
#include <linux/hdreg.h>
#include <sys/fcntl.h>
#include <sys/types.h>

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>


   typedef struct ata_smart_selftestlog_struct {
   unsigned char selftestnumber; // Sector number register
   unsigned char selfteststatus;
   unsigned short int timestamp;
   unsigned char selftestfailurecheckpoint;
   unsigned int lbafirstfailure;
   unsigned char vendorspecific[15];
    } ata_smart_selftestlog_struct;

   struct ata_smart_selftestlog{
   unsigned short int revnumber;
   struct ata_smart_selftestlog_struct selftest_struct[21];
   unsigned char vendorspecific[2];
   unsigned char mostrecenttest;
   unsigned char reserved[2];
   unsigned char chksum;
   };

int main(int argc, char **argv)
{
     int fd;
     struct {
         struct hd_drive_cmd_hdr header; //hdreg.h
         unsigned char data[512];
     } buf;

     buf.header.command = 0xB0; //WIN_SMART; ATA_CMD_SMART
     buf.header.sector_number = 0x06; //0x06
     buf.header.feature = 0xD5;//SMART_READ_LOG_SECTOR;
     buf.header.sector_count = 1;

if ((fd = open("/dev/sda", O_RDONLY)) < 0) {
     printf("ERROR opening device\n");
     exit(1);
}

if (!ioctl(fd, HDIO_DRIVE_CMD, &buf)) {

/*====================================================================================================*/
    struct ata_smart_selftestlog smart_selftestlog;

     memcpy(&smart_selftestlog, buf.data, sizeof(smart_selftestlog));

     printf("OK: ioctl(%d, HDIO_DRIVE_CMD)\n", fd);

     printf("\nSMART Self-test log, version number 
%u\n",smart_selftestlog.revnumber);
     if (smart_selftestlog.revnumber!=0x01){

         printf("Error -revision number does not match !\n");
         return 0;
     }
     if (smart_selftestlog.mostrecenttest==0){
         printf("No self-test have been logged\n");
         return 0;
       }
     else {
         printf("Number of Self-tests log: 
%d\n",smart_selftestlog.mostrecenttest);
     }



/*====================================================================================================*/
} else {
     printf("ERROR: ioctl ");
     exit(1);
}
     return 0;
}



where I'm doing wrong?
Please help me.

BART