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Full Discussion: Counter function problems...
Top Forums Shell Programming and Scripting Counter function problems... Post 302170806 by LinuxRacr on Tuesday 26th of February 2008 06:36:25 PM
Old 02-26-2008
Counter function problems...
Ok, here is the issue I have..

I wrote a script that builds disk groups using vxvm, and it works really good. I added a feature that would tell you the max size you could build your your lvol to. I do this by getting the size of the disks I am using in KB, I subtract 5104 from it, and then I multiply it by the number of disks I am using to build my disk group. I set this to a variable called $NUMBER for use throughout the script. The function is finished, it outputs the answer to a file called value.txt. For some reason it works great until $NUMBER = 5 or more.

Below is the section of the script that is giving me issues:
Code:
function adder_func
         {
         TYPE=$1
         if [ -s sizes.$TYPE ]; then
            let sum=0
            for i in `cat sizes.$TYPE`
            do
             ((i=$i - 5104))
             ((new_sum=$i + $sum))
             sum=$new_sum
            done
            ((last_sum=$new_sum*$NUMBER))
            echo ${last_sum}
           else
            break
          fi
         }

## Call the adder_func function and output to value.txt to get the max size for your lvol.
adder_func size > value.txt

When the function is with an option called 'size' it reads from a file called sizes.size (sizes.$TYPE). As you see, the size option is the same as the $TYPE variable.

Output from sizes.size (which is the size of the disks in KB):
524288000

Here is the output from value.txt when the $NUMBER variable = 5:
-1149269920

When I do the math, of course it shouldn't be a large negative number:

root@server:/root_home> bc -l
524288000-5104
524282896
524282896*5
2621414480

So it should be 2621414480 or 2499.97GB, or about 2.5TB.

Am I surpassing the numerical limits of the function?
 

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LEARN ABOUT OPENSOLARIS

getpagesizes

getpagesizes(3C)					   Standard C Library Functions 					  getpagesizes(3C)

NAME

       getpagesizes - get system supported page sizes

SYNOPSIS

       #include <sys/mman.h>

       int getpagesizes(size_t pagesize[], int nelem);

DESCRIPTION

       The getpagesizes() function returns either the number of different page sizes supported by the system or the actual sizes themselves.  When
       called with nelem as 0 and pagesize as NULL, getpagesizes() returns the number of supported page sizes. Otherwise, up to nelem  page  sizes
       are  retrieved and assigned to successive elements  of pagesize[].  The return value is the number of page sizes retrieved and set in page-
       size[].

RETURN VALUES

       Upon successful completion, the number of pagesizes supported or actually retrieved is returned. Otherwise, -1 is returned and errno is set
       to indicate the error.

ERRORS

       The getpagesizes() function will fail if:

       EINVAL	 The nelem argument is less than 0 or pagesize is NULL but nelem is non-zero.

USAGE

       The  getpagesizes()  function returns all the page sizes for which the hardware and system software provide support for the memcntl(2) com-
       mand MC_HAT_ADVISE. Not all processors support all page sizes or combinations of page sizes with equal efficiency. Applications programmers
       should take this into consideration when using getpagesizes().

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       memcntl(2), mmap(2), getpagesize(3C), attributes(5)

SunOS 5.11							    14 May 2001 						  getpagesizes(3C)
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