contrib/xz/src/common/tuklib_physmem.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       tuklib_physmem.c
   4 /// \brief      Get the amount of physical memory
   5 //
   6 //  Author:     Lasse Collin
   7 //
   8 //  This file has been put into the public domain.
   9 //  You can do whatever you want with this file.
  10 //
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #include "tuklib_physmem.h"
  14
  15 // We want to use Windows-specific code on Cygwin, which also has memory
  16 // information available via sysconf(), but on Cygwin 1.5 and older it
  17 // gives wrong results (from our point of view).
  18 #if defined(_WIN32) || defined(__CYGWIN__)
  19 #       ifndef _WIN32_WINNT
  20 #               define _WIN32_WINNT 0x0500
  21 #       endif
  22 #       include <windows.h>
  23
  24 #elif defined(__OS2__)
  25 #       define INCL_DOSMISC
  26 #       include <os2.h>
  27
  28 #elif defined(__DJGPP__)
  29 #       include <dpmi.h>
  30
  31 #elif defined(__VMS)
  32 #       include <lib$routines.h>
  33 #       include <syidef.h>
  34 #       include <ssdef.h>
  35
  36 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
  37 #       include <unistd.h>
  38
  39 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
  40 #       ifdef HAVE_SYS_PARAM_H
  41 #               include <sys/param.h>
  42 #       endif
  43 #       include <sys/sysctl.h>
  44
  45 // IRIX
  46 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
  47 #       include <invent.h>
  48
  49 // This sysinfo() is Linux-specific.
  50 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
  51 #       include <sys/sysinfo.h>
  52 #endif
  53
  54
  55 extern uint64_t
  56 tuklib_physmem(void)
  57 {
  58         uint64_t ret = 0;
  59
  60 #if defined(_WIN32) || defined(__CYGWIN__)
  61         if ((GetVersion() & 0xFF) >= 5) {
  62                 // Windows 2000 and later have GlobalMemoryStatusEx() which
  63                 // supports reporting values greater than 4 GiB. To keep the
  64                 // code working also on older Windows versions, use
  65                 // GlobalMemoryStatusEx() conditionally.
  66                 HMODULE kernel32 = GetModuleHandle("kernel32.dll");
  67                 if (kernel32 != NULL) {
  68                         BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
  69                                         kernel32, "GlobalMemoryStatusEx");
  70                         if (gmse != NULL) {
  71                                 MEMORYSTATUSEX meminfo;
  72                                 meminfo.dwLength = sizeof(meminfo);
  73                                 if (gmse(&meminfo))
  74                                         ret = meminfo.ullTotalPhys;
  75                         }
  76                 }
  77         }
  78
  79         if (ret == 0) {
  80                 // GlobalMemoryStatus() is supported by Windows 95 and later,
  81                 // so it is fine to link against it unconditionally. Note that
  82                 // GlobalMemoryStatus() has no return value.
  83                 MEMORYSTATUS meminfo;
  84                 meminfo.dwLength = sizeof(meminfo);
  85                 GlobalMemoryStatus(&meminfo);
  86                 ret = meminfo.dwTotalPhys;
  87         }
  88
  89 #elif defined(__OS2__)
  90         unsigned long mem;
  91         if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM,
  92                         &mem, sizeof(mem)) == 0)
  93                 ret = mem;
  94
  95 #elif defined(__DJGPP__)
  96         __dpmi_free_mem_info meminfo;
  97         if (__dpmi_get_free_memory_information(&meminfo) == 0
  98                         && meminfo.total_number_of_physical_pages
  99                                 != (unsigned long)-1)
 100                 ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096;
 101
 102 #elif defined(__VMS)
 103         int vms_mem;
 104         int val = SYI$_MEMSIZE;
 105         if (LIB$GETSYI(&val, &vms_mem, 0, 0, 0, 0) == SS$_NORMAL)
 106                 ret = (uint64_t)vms_mem * 8192;
 107
 108 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
 109         const long pagesize = sysconf(_SC_PAGESIZE);
 110         const long pages = sysconf(_SC_PHYS_PAGES);
 111         if (pagesize != -1 || pages != -1)
 112                 // According to docs, pagesize * pages can overflow.
 113                 // Simple case is 32-bit box with 4 GiB or more RAM,
 114                 // which may report exactly 4 GiB of RAM, and "long"
 115                 // being 32-bit will overflow. Casting to uint64_t
 116                 // hopefully avoids overflows in the near future.
 117                 ret = (uint64_t)pagesize * (uint64_t)pages;
 118
 119 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
 120         int name[2] = {
 121                 CTL_HW,
 122 #ifdef HW_PHYSMEM64
 123                 HW_PHYSMEM64
 124 #else
 125                 HW_PHYSMEM
 126 #endif
 127         };
 128         union {
 129                 uint32_t u32;
 130                 uint64_t u64;
 131         } mem;
 132         size_t mem_ptr_size = sizeof(mem.u64);
 133         if (sysctl(name, 2, &mem.u64, &mem_ptr_size, NULL, 0) != -1) {
 134                 // IIRC, 64-bit "return value" is possible on some 64-bit
 135                 // BSD systems even with HW_PHYSMEM (instead of HW_PHYSMEM64),
 136                 // so support both.
 137                 if (mem_ptr_size == sizeof(mem.u64))
 138                         ret = mem.u64;
 139                 else if (mem_ptr_size == sizeof(mem.u32))
 140                         ret = mem.u32;
 141         }
 142
 143 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
 144         inv_state_t *st = NULL;
 145         if (setinvent_r(&st) != -1) {
 146                 inventory_t *i;
 147                 while ((i = getinvent_r(st)) != NULL) {
 148                         if (i->inv_class == INV_MEMORY
 149                                         && i->inv_type == INV_MAIN_MB) {
 150                                 ret = (uint64_t)i->inv_state << 20;
 151                                 break;
 152                         }
 153                 }
 154
 155                 endinvent_r(st);
 156         }
 157
 158 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
 159         struct sysinfo si;
 160         if (sysinfo(&si) == 0)
 161                 ret = (uint64_t)si.totalram * si.mem_unit;
 162 #endif
 163
 164         return ret;
 165 }