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///////////////////////////////////////////////////////////////////////////////
//
/// \file tuklib_physmem.c
/// \brief Get the amount of physical memory
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include "tuklib_physmem.h"
// We want to use Windows-specific code on Cygwin, which also has memory
// information available via sysconf(), but on Cygwin 1.5 and older it
// gives wrong results (from our point of view).
#if defined(_WIN32) || defined(__CYGWIN__)
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0500
# endif
# include <windows.h>
#elif defined(__OS2__)
# define INCL_DOSMISC
# include <os2.h>
#elif defined(__DJGPP__)
# include <dpmi.h>
#elif defined(__VMS)
# include <lib$routines.h>
# include <syidef.h>
# include <ssdef.h>
#elif defined(TUKLIB_PHYSMEM_SYSCONF)
# include <unistd.h>
#elif defined(TUKLIB_PHYSMEM_SYSCTL)
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# include <sys/sysctl.h>
// IRIX
#elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
# include <invent.h>
// This sysinfo() is Linux-specific.
#elif defined(TUKLIB_PHYSMEM_SYSINFO)
# include <sys/sysinfo.h>
#endif
extern uint64_t
tuklib_physmem(void)
{
uint64_t ret = 0;
#if defined(_WIN32) || defined(__CYGWIN__)
if ((GetVersion() & 0xFF) >= 5) {
// Windows 2000 and later have GlobalMemoryStatusEx() which
// supports reporting values greater than 4 GiB. To keep the
// code working also on older Windows versions, use
// GlobalMemoryStatusEx() conditionally.
HMODULE kernel32 = GetModuleHandle("kernel32.dll");
if (kernel32 != NULL) {
BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
kernel32, "GlobalMemoryStatusEx");
if (gmse != NULL) {
MEMORYSTATUSEX meminfo;
meminfo.dwLength = sizeof(meminfo);
if (gmse(&meminfo))
ret = meminfo.ullTotalPhys;
}
}
}
if (ret == 0) {
// GlobalMemoryStatus() is supported by Windows 95 and later,
// so it is fine to link against it unconditionally. Note that
// GlobalMemoryStatus() has no return value.
MEMORYSTATUS meminfo;
meminfo.dwLength = sizeof(meminfo);
GlobalMemoryStatus(&meminfo);
ret = meminfo.dwTotalPhys;
}
#elif defined(__OS2__)
unsigned long mem;
if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM,
&mem, sizeof(mem)) == 0)
ret = mem;
#elif defined(__DJGPP__)
__dpmi_free_mem_info meminfo;
if (__dpmi_get_free_memory_information(&meminfo) == 0
&& meminfo.total_number_of_physical_pages
!= (unsigned long)-1)
ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096;
#elif defined(__VMS)
int vms_mem;
int val = SYI$_MEMSIZE;
if (LIB$GETSYI(&val, &vms_mem, 0, 0, 0, 0) == SS$_NORMAL)
ret = (uint64_t)vms_mem * 8192;
#elif defined(TUKLIB_PHYSMEM_SYSCONF)
const long pagesize = sysconf(_SC_PAGESIZE);
const long pages = sysconf(_SC_PHYS_PAGES);
if (pagesize != -1 || pages != -1)
// According to docs, pagesize * pages can overflow.
// Simple case is 32-bit box with 4 GiB or more RAM,
// which may report exactly 4 GiB of RAM, and "long"
// being 32-bit will overflow. Casting to uint64_t
// hopefully avoids overflows in the near future.
ret = (uint64_t)pagesize * (uint64_t)pages;
#elif defined(TUKLIB_PHYSMEM_SYSCTL)
int name[2] = {
CTL_HW,
#ifdef HW_PHYSMEM64
HW_PHYSMEM64
#else
HW_PHYSMEM
#endif
};
union {
uint32_t u32;
uint64_t u64;
} mem;
size_t mem_ptr_size = sizeof(mem.u64);
if (sysctl(name, 2, &mem.u64, &mem_ptr_size, NULL, 0) != -1) {
// IIRC, 64-bit "return value" is possible on some 64-bit
// BSD systems even with HW_PHYSMEM (instead of HW_PHYSMEM64),
// so support both.
if (mem_ptr_size == sizeof(mem.u64))
ret = mem.u64;
else if (mem_ptr_size == sizeof(mem.u32))
ret = mem.u32;
}
#elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
inv_state_t *st = NULL;
if (setinvent_r(&st) != -1) {
inventory_t *i;
while ((i = getinvent_r(st)) != NULL) {
if (i->inv_class == INV_MEMORY
&& i->inv_type == INV_MAIN_MB) {
ret = (uint64_t)i->inv_state << 20;
break;
}
}
endinvent_r(st);
}
#elif defined(TUKLIB_PHYSMEM_SYSINFO)
struct sysinfo si;
if (sysinfo(&si) == 0)
ret = (uint64_t)si.totalram * si.mem_unit;
#endif
return ret;
}
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