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In java it's simply:
Runtime.getRuntime().freeMemory()
How to do it in C?
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Linux free -m The most common way you'll see on the web to check for free memory in Linux is by using the free command. Using the free -m command to check your Linux memory usage, displays the values as MB instead of KB. The free column beside -/+ buffers/cache with 823 MB is the actual free memory available to Linux.
Entering cat /proc/meminfo in your terminal opens the /proc/meminfo file. This is a virtual file that reports the amount of available and used memory. It contains real-time information about the system's memory usage as well as the buffers and shared memory used by the kernel.
On Linux you can use the command cat /proc/meminfo to determine how much memory the computer has. This command displays the information stored in the meminfo file located in the /proc directory.
Press Ctrl + Shift + Esc to launch Task Manager. Or, right-click the Taskbar and select Task Manager. Select the Performance tab to see current RAM usage displayed in the Memory box, and total RAM capacity listed under Physical Memory.
You can get the virtual memory limit for a process under linux using getrlimit() with the RLIMIT_AS parameter.
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