lsgrmGetInternalMemory.h 3.13 KiB
/*
 * Author:  David Robert Nadeau
 * Site:    http://NadeauSoftware.com/
 * License: Creative Commons Attribution 3.0 Unported License
 *          http://creativecommons.org/licenses/by/3.0/deed.en_US
 */
#ifndef __LSGRM_GETINTERNALMEMORY_H
#define __LSGRM_GETINTERNALMEMORY_H
#if defined(_WIN32)
#include <Windows.h>
#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#if defined(BSD)
#include <sys/sysctl.h>
#endif
#else
#error "Unable to define getMemorySize( ) for an unknown OS."
#endif
/**
 * Returns the size of physical memory (RAM) in bytes.
size_t getMemorySize( )
#if defined(_WIN32) && (defined(__CYGWIN__) || defined(__CYGWIN32__))
	/* Cygwin under Windows. ------------------------------------ */
	/* New 64-bit MEMORYSTATUSEX isn't available.  Use old 32.bit */
	MEMORYSTATUS status;
	status.dwLength = sizeof(status);
	GlobalMemoryStatus( &status );
	return (size_t)status.dwTotalPhys;
#elif defined(_WIN32)
	/* Windows. ------------------------------------------------- */
	/* Use new 64-bit MEMORYSTATUSEX, not old 32-bit MEMORYSTATUS */
	MEMORYSTATUSEX status;
	status.dwLength = sizeof(status);
	GlobalMemoryStatusEx( &status );
	return (size_t)status.ullTotalPhys;
#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
	/* UNIX variants. ------------------------------------------- */
	/* Prefer sysctl() over sysconf() except sysctl() HW_REALMEM and HW_PHYSMEM */
#if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
	int mib[2];
	mib[0] = CTL_HW;
#if defined(HW_MEMSIZE)
	mib[1] = HW_MEMSIZE;            /* OSX. --------------------- */
#elif defined(HW_PHYSMEM64)
	mib[1] = HW_PHYSMEM64;          /* NetBSD, OpenBSD. --------- */
#endif
	int64_t size = 0;               /* 64-bit */
	size_t len = sizeof( size );
	if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 )
		return (size_t)size;
	return 0L;			/* Failed? */
#elif defined(_SC_AIX_REALMEM)
	/* AIX. ----------------------------------------------------- */
	return (size_t)sysconf( _SC_AIX_REALMEM ) * (size_t)1024L;
#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
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/* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */ return (size_t)sysconf( _SC_PHYS_PAGES ) * (size_t)sysconf( _SC_PAGESIZE ); #elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGE_SIZE) /* Legacy. -------------------------------------------------- */ return (size_t)sysconf( _SC_PHYS_PAGES ) * (size_t)sysconf( _SC_PAGE_SIZE ); #elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM)) /* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */ int mib[2]; mib[0] = CTL_HW; #if defined(HW_REALMEM) mib[1] = HW_REALMEM; /* FreeBSD. ----------------- */ #elif defined(HW_PYSMEM) mib[1] = HW_PHYSMEM; /* Others. ------------------ */ #endif unsigned int size = 0; /* 32-bit */ size_t len = sizeof( size ); if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 ) return (size_t)size; return 0L; /* Failed? */ #endif /* sysctl and sysconf variants */ #else return 0L; /* Unknown OS. */ #endif } #endif