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-rw-r--r--src/common/tuklib_physmem.c146
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diff --git a/src/common/tuklib_physmem.c b/src/common/tuklib_physmem.c
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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$routines.h>
+# include <syidef.h>
+# include <ssdef.h>
+
+#elif defined(TUKLIB_PHYSMEM_SYSCONF)
+# include <unistd.h>
+
+#elif defined(TUKLIB_PHYSMEM_SYSCTL)
+# ifdef HAVE_SYS_PARAM_H
+# include <sys/param.h>
+# endif
+# include <sys/sysctl.h>
+
+// This sysinfo() is Linux-specific.
+#elif defined(TUKLIB_PHYSMEM_SYSINFO)
+# include <sys/sysinfo.h>
+#endif
+
+
+extern uint64_t
+tuklib_physmem(void)
+{
+ uint64_t ret = 0;
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+ if ((GetVersion() & 0xFF) >= 5) {
+ // Windows 2000 and later have GlobalMemoryStatusEx() which
+ // supports reporting values greater than 4 GiB. To keep the
+ // code working also on older Windows versions, use
+ // GlobalMemoryStatusEx() conditionally.
+ HMODULE kernel32 = GetModuleHandle("kernel32.dll");
+ if (kernel32 != NULL) {
+ BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
+ kernel32, "GlobalMemoryStatusEx");
+ if (gmse != NULL) {
+ MEMORYSTATUSEX meminfo;
+ meminfo.dwLength = sizeof(meminfo);
+ if (gmse(&meminfo))
+ ret = meminfo.ullTotalPhys;
+ }
+ }
+ }
+
+ if (ret == 0) {
+ // GlobalMemoryStatus() is supported by Windows 95 and later,
+ // so it is fine to link against it unconditionally. Note that
+ // GlobalMemoryStatus() has no return value.
+ MEMORYSTATUS meminfo;
+ meminfo.dwLength = sizeof(meminfo);
+ GlobalMemoryStatus(&meminfo);
+ ret = meminfo.dwTotalPhys;
+ }
+
+#elif defined(__OS2__)
+ unsigned long mem;
+ if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM,
+ &mem, sizeof(mem)) == 0)
+ ret = mem;
+
+#elif defined(__DJGPP__)
+ __dpmi_free_mem_info meminfo;
+ if (__dpmi_get_free_memory_information(&meminfo) == 0
+ && meminfo.total_number_of_physical_pages
+ != (unsigned long)-1)
+ ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096;
+
+#elif defined(__VMS)
+ int vms_mem;
+ int val = SYI$_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_SYSINFO)
+ struct sysinfo si;
+ if (sysinfo(&si) == 0)
+ ret = (uint64_t)si.totalram * si.mem_unit;
+#endif
+
+ return ret;
+}