What r the functions used to read data from the all the sectors of hdd

nutanj · 10-30-2006, 05:26 AM

Hi,
Since last two year i m working in c,c++ on keil compiler. I don't know much about Linux Programming.

In my current project i would like to code in C language which will tst the functionality of hard disk.

Like,
1. Address each sector of the HDD (used and unused )
2..Read the data form used sector
3..write that data to some tem. buffer
4..write some new data to the sector
5..Read the data back from the sector
6..Compare the data to test the read and write operation
7..Writr the original data from the tem. buffer to the sector
8..Then apply the same procedure to next sector and so on.....

I know in the linux dd command can be used for the same purpose, but i want to write the code in "C"

Can any one please tell me that how to find the source code for the dd command??

What r the different functions used to access the perticular sector,read the data from that sector, write the data......

Please help me....

Thanks and Regards,
Nutty

bernied · 10-30-2006, 05:47 AM

It might be in coreutils:
http://www.gnu.org/software/coreutils/

soggycornflake · 10-30-2006, 11:03 AM

Quote:

It might be in coreutils:

Indeed it is.

nutanj, the package manager in most (if not all) distros can show what package a command comes from. Read up on rpm/apt or whatever your distro uses.

Here in Slackware-land, I just need to

Code:

(~) grep 'bin/dd$' /var/log/packages/*
/var/log/packages/coreutils-5.2.1-i486-1:bin/dd

Quote:

What r the different functions used to access the perticular sector,read the data from that sector, write the data......

I pretty sure that Linux block device drivers abstract away the concept of a 'sector'. Disks just behave like big files. i.e. to read 'sector' 10 (assuming 512 byte sectors) just use somethig like 'lseek(fd, 512*10, 0); read(fd, buf, 512);'.