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(AMIGA) || defined(__AROS__) 37 # define __USE_INLINE__ 38 # include <proto/exec.h> 39 40 #elif defined(__QNX__) 41 # include <sys/syspage.h> 42 # include <string.h> 43 44 #elif defined(TUKLIB_PHYSMEM_AIX) 45 # include <sys/systemcfg.h> 46 47 #elif defined(TUKLIB_PHYSMEM_SYSCONF) 48 # include <limits.h> 49 # include <unistd.h> 50 51 #elif defined(TUKLIB_PHYSMEM_SYSCTL) 52 # ifdef HAVE_SYS_PARAM_H 53 # include <sys/param.h> 54 # endif 55 # include <sys/sysctl.h> 56 57 // Tru64 58 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO) 59 # include <sys/sysinfo.h> 60 # include <machine/hal_sysinfo.h> 61 62 // HP-UX 63 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC) 64 # include <sys/param.h> 65 # include <sys/pstat.h> 66 67 // IRIX 68 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R) 69 # include <invent.h> 70 71 // This sysinfo() is Linux-specific. 72 #elif defined(TUKLIB_PHYSMEM_SYSINFO) 73 # include <sys/sysinfo.h> 74 #endif 75 76 77 extern uint64_t 78 tuklib_physmem(void) 79 { 80 uint64_t ret = 0; 81 82 #if defined(_WIN32) || defined(__CYGWIN__) 83 if ((GetVersion() & 0xFF) >= 5) { 84 // Windows 2000 and later have GlobalMemoryStatusEx() which 85 // supports reporting values greater than 4 GiB. To keep the 86 // code working also on older Windows versions, use 87 // GlobalMemoryStatusEx() conditionally. 88 HMODULE kernel32 = GetModuleHandle("kernel32.dll"); 89 if (kernel32 != NULL) { 90 typedef BOOL (WINAPI *gmse_type)(LPMEMORYSTATUSEX); 91 gmse_type gmse = (gmse_type)GetProcAddress( 92 kernel32, "GlobalMemoryStatusEx"); 93 if (gmse != NULL) { 94 MEMORYSTATUSEX meminfo; 95 meminfo.dwLength = sizeof(meminfo); 96 if (gmse(&meminfo)) 97 ret = meminfo.ullTotalPhys; 98 } 99 } 100 } 101 102 if (ret == 0) { 103 // GlobalMemoryStatus() is supported by Windows 95 and later, 104 // so it is fine to link against it unconditionally. Note that 105 // GlobalMemoryStatus() has no return value. 106 MEMORYSTATUS meminfo; 107 meminfo.dwLength = sizeof(meminfo); 108 GlobalMemoryStatus(&meminfo); 109 ret = meminfo.dwTotalPhys; 110 } 111 112 #elif defined(__OS2__) 113 unsigned long mem; 114 if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM, 115 &mem, sizeof(mem)) == 0) 116 ret = mem; 117 118 #elif defined(__DJGPP__) 119 __dpmi_free_mem_info meminfo; 120 if (__dpmi_get_free_memory_information(&meminfo) == 0 121 && meminfo.total_number_of_physical_pages 122 != (unsigned long)-1) 123 ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096; 124 125 #elif defined(__VMS) 126 int vms_mem; 127 int val = SYI$_MEMSIZE; 128 if (LIB$GETSYI(&val, &vms_mem, 0, 0, 0, 0) == SS$_NORMAL) 129 ret = (uint64_t)vms_mem * 8192; 130 131 #elif defined(AMIGA) || defined(__AROS__) 132 ret = AvailMem(MEMF_TOTAL); 133 134 #elif defined(__QNX__) 135 const struct asinfo_entry *entries = SYSPAGE_ENTRY(asinfo); 136 size_t count = SYSPAGE_ENTRY_SIZE(asinfo) / sizeof(struct asinfo_entry); 137 const char *strings = SYSPAGE_ENTRY(strings)->data; 138 139 for (size_t i = 0; i < count; ++i) 140 if (strcmp(strings + entries[i].name, "ram") == 0) 141 ret += entries[i].end - entries[i].start + 1; 142 143 #elif defined(TUKLIB_PHYSMEM_AIX) 144 ret = _system_configuration.physmem; 145 146 #elif defined(TUKLIB_PHYSMEM_SYSCONF) 147 const long pagesize = sysconf(_SC_PAGESIZE); 148 const long pages = sysconf(_SC_PHYS_PAGES); 149 if (pagesize != -1 && pages != -1) { 150 // According to docs, pagesize * pages can overflow. 151 // Simple case is 32-bit box with 4 GiB or more RAM, 152 // which may report exactly 4 GiB of RAM, and "long" 153 // being 32-bit will overflow. Casting to uint64_t 154 // hopefully avoids overflows in the near future. 155 ret = (uint64_t)pagesize * (uint64_t)pages; 156 if (ret > SIZE_T_MAX) 157 ret = SIZE_T_MAX; 158 } 159 160 #elif defined(TUKLIB_PHYSMEM_SYSCTL) 161 int name[2] = { 162 CTL_HW, 163 #ifdef HW_PHYSMEM64 164 HW_PHYSMEM64 165 #else 166 HW_PHYSMEM 167 #endif 168 }; 169 union { 170 uint32_t u32; 171 uint64_t u64; 172 } mem; 173 size_t mem_ptr_size = sizeof(mem.u64); 174 if (sysctl(name, 2, &mem.u64, &mem_ptr_size, NULL, 0) != -1) { 175 // IIRC, 64-bit "return value" is possible on some 64-bit 176 // BSD systems even with HW_PHYSMEM (instead of HW_PHYSMEM64), 177 // so support both. 178 if (mem_ptr_size == sizeof(mem.u64)) 179 ret = mem.u64; 180 else if (mem_ptr_size == sizeof(mem.u32)) 181 ret = mem.u32; 182 } 183 184 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO) 185 // Docs are unclear if "start" is needed, but it doesn't hurt 186 // much to have it. 187 int memkb; 188 int start = 0; 189 if (getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start) 190 != -1) 191 ret = (uint64_t)memkb * 1024; 192 193 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC) 194 struct pst_static pst; 195 if (pstat_getstatic(&pst, sizeof(pst), 1, 0) != -1) 196 ret = (uint64_t)pst.physical_memory * (uint64_t)pst.page_size; 197 198 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R) 199 inv_state_t *st = NULL; 200 if (setinvent_r(&st) != -1) { 201 inventory_t *i; 202 while ((i = getinvent_r(st)) != NULL) { 203 if (i->inv_class == INV_MEMORY 204 && i->inv_type == INV_MAIN_MB) { 205 ret = (uint64_t)i->inv_state << 20; 206 break; 207 } 208 } 209 210 endinvent_r(st); 211 } 212 213 #elif defined(TUKLIB_PHYSMEM_SYSINFO) 214 struct sysinfo si; 215 if (sysinfo(&si) == 0) 216 ret = (uint64_t)si.totalram * si.mem_unit; 217 #endif 218 219 return ret; 220 } 221