#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

MODULE = Sys::MemInfo PACKAGE = Sys::MemInfo

#include "arch/functions.h"
#include <stdio.h>
#include <unistd.h>
#include <sys/sysinfo.h>

void
availkeys()
	PREINIT:
	PPCODE:
                XPUSHs(sv_2mortal(newSVpv(_totalmem, strlen(_totalmem))));
                XPUSHs(sv_2mortal(newSVpv(_freemem, strlen(_freemem))));
                XPUSHs(sv_2mortal(newSVpv(_totalswap, strlen(_totalswap))));
                XPUSHs(sv_2mortal(newSVpv(_freeswap, strlen(_freeswap))));
  
double
totalmem()
	PROTOTYPE: DISABLE
	CODE:
		const long long pagetotal = sysconf (_SC_PHYS_PAGES);
		const long long pagesize = sysconf (_SC_PAGESIZE);
		double ret = (pagetotal *pagesize);
		RETVAL = ret;
	OUTPUT:
		RETVAL

double
freemem()
	PROTOTYPE: DISABLE
	CODE:
		const long long pagesize = sysconf (_SC_PAGESIZE);
		const long long pageavail = sysconf (_SC_AVPHYS_PAGES);
		double ret= (pageavail * pagesize);
		RETVAL = ret;
	OUTPUT:
		RETVAL

double
totalswap()
	PROTOTYPE: DISABLE
	CODE:
		struct sysinfo info;
		double ret= 0;
#ifdef OLDKERNEL
		if (0==sysinfo(&info)) ret = info.totalswap;
#else
		if (0==sysinfo(&info)) ret = info.mem_unit * info.totalswap;
#endif
		RETVAL = ret;
	OUTPUT:
		RETVAL

double
freeswap()
	PROTOTYPE: DISABLE
	CODE:
		struct sysinfo info;
		double ret= 0;
#ifdef OLDKERNEL
		if (0==sysinfo(&info)) ret = info.freeswap;
#else
		if (0==sysinfo(&info)) ret = info.mem_unit * info.freeswap;
#endif
		RETVAL = ret;
	OUTPUT:
		RETVAL

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