How many partition on hard disk?

helpmeforlinux · #1 03-Sep-2006, 21:36

Hi , i want to know how many partition on hard disk in linux using c program ?
Does any body have idea about this , please give me any idea abt this.

#2 07-Sep-2006, 22:52

Quote:

Originally Posted by helpmeforlinux

Hi , i want to know how many partition on hard disk in linux using c program ?
Does any body have idea about this , please give me any idea abt this.

You can try something like:

Code:

$ cat /proc/partitions
major minor  #blocks  name

   3     0   60051600 hda
   3     1   60050938 hda1
   3    64   60051600 hdb
   3    65     104391 hdb1
   3    66   59946547 hdb2
 253     0   57835520 dm-0
 253     1    2031616 dm-1

You can easily just read (using fopen) the /proc/partitions file and parse out the partitions very simply.

Here is an example:

CPP / C++ / C Code:

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

int main()
{
    int rc = 0;
    FILE* p_infile = 0;
    char buffer[BUFSIZ] = {0};

    p_infile = fopen( "/proc/partitions", "r" );
    if( !p_infile )
    {
        rc = errno;
        printf( "error reading /proc/partitions for input!  error: %d\n", rc );
    }
    else
    {
        fread( buffer, 1, sizeof( buffer ), p_infile );
        printf( "Partitions:\n%s\n", buffer );
        /*
            Instead of printing, you'd probably want to parse them.
        */
    }

    if( p_infile )
    {
        fclose( p_infile );
        p_infile = 0;
    }
    return rc;
}

Output:

Code:

Partitions:
major minor  #blocks  name

   3     0   60051600 hda
   3     1   60050938 hda1
   3    64   60051600 hdb
   3    65     104391 hdb1
   3    66   59946547 hdb2
 253     0   57835520 dm-0
 253     1    2031616 dm-1

:davis:

helpmeforlinux · #3 11-Sep-2006, 07:07

Respected Davis,
Thanks for ur reply , but actually i want this information without /proc file system.
The one thing i have done is i have used the object of structure statfs.
But now how to get all the partition information that i don't have idea.
If u have any suggestion then please tell me, but it should be without /proc file system.
Waiting for ur reply.

Quote:

Originally Posted by davis

You can try something like:

Code:

$ cat /proc/partitions
major minor  #blocks  name

   3     0   60051600 hda
   3     1   60050938 hda1
   3    64   60051600 hdb
   3    65     104391 hdb1
   3    66   59946547 hdb2
 253     0   57835520 dm-0
 253     1    2031616 dm-1

You can easily just read (using fopen) the /proc/partitions file and parse out the partitions very simply.

Here is an example:

CPP / C++ / C Code:

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

int main()
{
    int rc = 0;
    FILE* p_infile = 0;
    char buffer[BUFSIZ] = {0};

    p_infile = fopen( "/proc/partitions", "r" );
    if( !p_infile )
    {
        rc = errno;
        printf( "error reading /proc/partitions for input!  error: %d\n", rc );
    }
    else
    {
        fread( buffer, 1, sizeof( buffer ), p_infile );
        printf( "Partitions:\n%s\n", buffer );
        /*
            Instead of printing, you'd probably want to parse them.
        */
    }

    if( p_infile )
    {
        fclose( p_infile );
        p_infile = 0;
    }
    return rc;
}

Output:

Code:

Partitions:
major minor  #blocks  name

   3     0   60051600 hda
   3     1   60050938 hda1
   3    64   60051600 hdb
   3    65     104391 hdb1
   3    66   59946547 hdb2
 253     0   57835520 dm-0
 253     1    2031616 dm-1

:davis:

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How many partition on hard disk?

Re: How many partition on hard disk?

Thanks for ur kind reply!