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1 /* Calculate the size of physical memory.
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2 Copyright (C) 2000-2020 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 /* Written by Paul Eggert. */
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19
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20 #if HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 #if HAVE_UNISTD_H
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25 # include <unistd.h>
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26 #endif
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27
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28 #if HAVE_SYS_PSTAT_H
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29 # include <sys/pstat.h>
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30 #endif
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31
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32 #if HAVE_SYS_SYSMP_H
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33 # include <sys/sysmp.h>
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34 #endif
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35
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36 #if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
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37 # include <sys/sysinfo.h>
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38 # include <machine/hal_sysinfo.h>
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39 #endif
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40
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41 #if HAVE_SYS_TABLE_H
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42 # include <sys/table.h>
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43 #endif
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44
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45 #include <sys/types.h>
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46
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47 #if HAVE_SYS_PARAM_H
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48 # include <sys/param.h>
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49 #endif
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50
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51 #if HAVE_SYS_SYSCTL_H
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52 # include <sys/sysctl.h>
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53 #endif
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54
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55 #if HAVE_SYS_SYSTEMCFG_H
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56 # include <sys/systemcfg.h>
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57 #endif
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58
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59 #ifdef _WIN32
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60 # define WIN32_LEAN_AND_MEAN
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61 # include <windows.h>
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62 /* MEMORYSTATUSEX is missing from older windows headers, so define
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63 a local replacement. */
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64 typedef struct
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65 {
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66 DWORD dwLength;
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67 DWORD dwMemoryLoad;
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68 DWORDLONG ullTotalPhys;
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69 DWORDLONG ullAvailPhys;
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70 DWORDLONG ullTotalPageFile;
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71 DWORDLONG ullAvailPageFile;
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72 DWORDLONG ullTotalVirtual;
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73 DWORDLONG ullAvailVirtual;
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74 DWORDLONG ullAvailExtendedVirtual;
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75 } lMEMORYSTATUSEX;
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76 typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
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77 #endif
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78
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79 #include "libiberty.h"
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80
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81 /* Return the total amount of physical memory. */
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82 double
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83 physmem_total (void)
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84 {
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85 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
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86 { /* This works on linux-gnu, solaris2 and cygwin. */
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87 double pages = sysconf (_SC_PHYS_PAGES);
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88 double pagesize = sysconf (_SC_PAGESIZE);
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89 if (0 <= pages && 0 <= pagesize)
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90 return pages * pagesize;
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91 }
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92 #endif
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93
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94 #if HAVE_PSTAT_GETSTATIC
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95 { /* This works on hpux11. */
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96 struct pst_static pss;
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97 if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
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98 {
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99 double pages = pss.physical_memory;
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100 double pagesize = pss.page_size;
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101 if (0 <= pages && 0 <= pagesize)
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102 return pages * pagesize;
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103 }
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104 }
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105 #endif
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106
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107 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
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108 { /* This works on irix6. */
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109 struct rminfo realmem;
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110 if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
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111 {
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112 double pagesize = sysconf (_SC_PAGESIZE);
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113 double pages = realmem.physmem;
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114 if (0 <= pages && 0 <= pagesize)
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115 return pages * pagesize;
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116 }
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117 }
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118 #endif
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119
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120 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
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121 { /* This works on Tru64 UNIX V4/5. */
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122 int physmem;
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123
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124 if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
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125 NULL, NULL, NULL) == 1)
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126 {
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127 double kbytes = physmem;
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128
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129 if (0 <= kbytes)
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130 return kbytes * 1024.0;
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131 }
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132 }
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133 #endif
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134
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135 #if HAVE_SYSCTL && defined HW_PHYSMEM
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136 { /* This works on *bsd and darwin. */
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137 unsigned int physmem;
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138 size_t len = sizeof physmem;
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139 static int mib[2] = { CTL_HW, HW_PHYSMEM };
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140
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141 if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
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142 && len == sizeof (physmem))
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143 return (double) physmem;
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144 }
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145 #endif
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146
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147 #if HAVE__SYSTEM_CONFIGURATION
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148 /* This works on AIX 4.3.3+. */
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149 return _system_configuration.physmem;
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150 #endif
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151
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152 #if defined _WIN32
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153 { /* this works on windows */
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154 PFN_MS_EX pfnex;
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155 HMODULE h = GetModuleHandle ("kernel32.dll");
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156
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157 if (!h)
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158 return 0.0;
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159
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160 /* Use GlobalMemoryStatusEx if available. */
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161 if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
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162 {
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163 lMEMORYSTATUSEX lms_ex;
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164 lms_ex.dwLength = sizeof lms_ex;
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165 if (!pfnex (&lms_ex))
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166 return 0.0;
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167 return (double) lms_ex.ullTotalPhys;
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168 }
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169
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170 /* Fall back to GlobalMemoryStatus which is always available.
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171 but returns wrong results for physical memory > 4GB. */
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172 else
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173 {
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174 MEMORYSTATUS ms;
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175 GlobalMemoryStatus (&ms);
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176 return (double) ms.dwTotalPhys;
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177 }
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178 }
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179 #endif
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180
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181 /* Return 0 if we can't determine the value. */
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182 return 0;
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183 }
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184
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185 /* Return the amount of physical memory available. */
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186 double
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187 physmem_available (void)
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188 {
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189 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
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190 { /* This works on linux-gnu, solaris2 and cygwin. */
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191 double pages = sysconf (_SC_AVPHYS_PAGES);
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192 double pagesize = sysconf (_SC_PAGESIZE);
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193 if (0 <= pages && 0 <= pagesize)
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194 return pages * pagesize;
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195 }
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196 #endif
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197
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198 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
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199 { /* This works on hpux11. */
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200 struct pst_static pss;
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201 struct pst_dynamic psd;
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202 if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
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203 && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
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204 {
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205 double pages = psd.psd_free;
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206 double pagesize = pss.page_size;
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207 if (0 <= pages && 0 <= pagesize)
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208 return pages * pagesize;
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209 }
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210 }
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211 #endif
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212
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213 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
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214 { /* This works on irix6. */
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215 struct rminfo realmem;
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216 if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
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217 {
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218 double pagesize = sysconf (_SC_PAGESIZE);
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219 double pages = realmem.availrmem;
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220 if (0 <= pages && 0 <= pagesize)
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221 return pages * pagesize;
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222 }
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223 }
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224 #endif
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225
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226 #if HAVE_TABLE && defined TBL_VMSTATS
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227 { /* This works on Tru64 UNIX V4/5. */
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228 struct tbl_vmstats vmstats;
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229
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230 if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
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231 {
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232 double pages = vmstats.free_count;
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233 double pagesize = vmstats.pagesize;
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234
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235 if (0 <= pages && 0 <= pagesize)
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236 return pages * pagesize;
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237 }
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238 }
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239 #endif
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240
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241 #if HAVE_SYSCTL && defined HW_USERMEM
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242 { /* This works on *bsd and darwin. */
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243 unsigned int usermem;
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244 size_t len = sizeof usermem;
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245 static int mib[2] = { CTL_HW, HW_USERMEM };
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246
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247 if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
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248 && len == sizeof (usermem))
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249 return (double) usermem;
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250 }
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251 #endif
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252
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253 #if defined _WIN32
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254 { /* this works on windows */
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255 PFN_MS_EX pfnex;
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256 HMODULE h = GetModuleHandle ("kernel32.dll");
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257
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258 if (!h)
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259 return 0.0;
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260
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261 /* Use GlobalMemoryStatusEx if available. */
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262 if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
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263 {
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264 lMEMORYSTATUSEX lms_ex;
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265 lms_ex.dwLength = sizeof lms_ex;
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266 if (!pfnex (&lms_ex))
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267 return 0.0;
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268 return (double) lms_ex.ullAvailPhys;
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269 }
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270
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271 /* Fall back to GlobalMemoryStatus which is always available.
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272 but returns wrong results for physical memory > 4GB */
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273 else
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274 {
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275 MEMORYSTATUS ms;
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276 GlobalMemoryStatus (&ms);
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277 return (double) ms.dwAvailPhys;
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278 }
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279 }
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280 #endif
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281
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282 /* Guess 25% of physical memory. */
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283 return physmem_total () / 4;
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284 }
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285
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286
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287 #if DEBUG
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288
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289 # include <stdio.h>
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290 # include <stdlib.h>
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291
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292 int
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293 main (void)
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294 {
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295 printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
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296 exit (0);
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297 }
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298
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299 #endif /* DEBUG */
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300
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301 /*
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302 Local Variables:
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303 compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
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304 End:
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305 */
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