getRSS

This code is the backup of getRSS.c whose link is broken now. This file provides 2 APIs:

/* get the current resident set size, in bytes, of the current process */
size_t currentSize = getCurrentRSS( );

/* get the peak resident set size, in bytes, of the current process */
size_t peakSize = getPeakRSS( );

If you use it on Winodows, you should link it with psapi.lib.

The other thing you should pay attention is for GetProcessMemoryInfo and getrusage, the code doesn't check return value. So if you use it, I think it is a good habit to check the return value.