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Getting the total virtual memory for ubuntu in c++

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# 1  
Old 05-04-2009
Getting the total virtual memory for ubuntu in c++
Hi guys , i need to get the total virtual memory in ubuntu but i need to write a C++ code for that, any idea on how to go about doing it? any references? or website that i can refer to ?
# 2  
Old 05-04-2009
Open /proc/meminfo for reading and look for the lines MemTotal and SwapTotal. Sum those up, and pronto! you have the total of virtual memory. Or you malloc() until it fails, although this probably won't give you a correct value and is generally considered rude.

But I don't think that either C or C++ has any function to give you that value, since memory is usually handled by the OS.
# 3  
Old 05-04-2009
can we use ps u den we pipe into the c++
# 4  
Old 05-04-2009
getting the Total Virtual Memory size occupied by all processes in unix by c++

any one can help?
# 5  
Old 05-04-2009
Moved to High Level Programming.
# 6  
Old 05-04-2009
First, please don't bump up your questions. If you need a fast answer, provide us with some more information on what you need and what you've tried so far.
Second, as I said, C/C++ has no knowledge of virtual memory, since that is handled by the OS. On Linux you can get all the information you need from /proc/meminfo (description here)
# 7  
Old 05-05-2009
pludi gave a fully correct answer. There are other ways involving accessing kernel memory directly, but that is very advanced programming.

You can also call popen() with a command of "vmstat -s".

This is the output of vmstat -s, you want the stuff in red
Code:
$ vmstat -s
      2096612  total memory
       788440  used memory 
            0  active memory
            0  inactive memory
      1308172  free memory
            0  buffer memory
            0  swap cache
      1572864  total swap
        13312  used swap
      1559552  free swap
     17632780 non-nice user cpu ticks
            0 nice user cpu ticks
     18800467 system cpu ticks
   1772277920 idle cpu ticks
            0 IO-wait cpu ticks
            0 IRQ cpu ticks
            0 softirq cpu ticks
     11051537 pages paged in
     22309640 pages paged out
     11051537 pages swapped in
       345219 pages swapped out
    481163032 interrupts
   1720440275 CPU context switches
   1240017420 boot time
            0 forks

It is easier to read the /proc/meminfo "file"
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