121 lines
3.9 KiB
C
121 lines
3.9 KiB
C
/*
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* Author: David Robert Nadeau
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* Site: http://NadeauSoftware.com/
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* License: Creative Commons Attribution 3.0 Unported License
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* http://creativecommons.org/licenses/by/3.0/deed.en_US
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* Modified: Holger Vogt, 2019
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*/
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#include "ngspice/ngspice.h"
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#include "resource.h"
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#if defined(_WIN32)
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#undef BOOLEAN
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#include <windows.h>
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#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#if defined(BSD) && defined(HAVE_SYS_SYSCTL_H)
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#include <sys/sysctl.h>
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#endif
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#else
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#error "Unable to define getMemorySize( ) for an unknown OS."
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#endif
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/**
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* Returns the size of physical memory (RAM) in bytes.
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*/
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unsigned long long getMemorySize(void)
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{
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#if defined(HAVE__PROC_MEMINFO)
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/* Cygwin , Linux--------------------------------- */
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FILE *fp;
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char buffer[2048];
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size_t bytes_read;
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char *match;
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unsigned long long mem_got;
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if ((fp = fopen("/proc/meminfo", "r")) == NULL) {
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perror("fopen(\"/proc/meminfo\")");
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return 0;
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}
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bytes_read = fread(buffer, 1, sizeof(buffer), fp);
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fclose(fp);
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if (bytes_read == 0 || bytes_read == sizeof(buffer))
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return 0;
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buffer[bytes_read] = '\0';
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/* Search for string "MemTotal" */
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match = strstr(buffer, "MemTotal");
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if (match == NULL) /* not found */
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return 0;
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sscanf(match, "MemTotal: %llu", &mem_got);
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return mem_got * 1024L;
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#elif defined(_WIN32)
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/* Windows. ------------------------------------------------- */
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/* Use new 64-bit MEMORYSTATUSEX, not old 32-bit MEMORYSTATUS */
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MEMORYSTATUSEX status;
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status.dwLength = sizeof(status);
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GlobalMemoryStatusEx( &status );
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return (unsigned long long) status.ullTotalPhys;
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#elif defined(__unix__) || defined(__unix) || defined(unix) || \
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(defined(__APPLE__) && defined(__MACH__))
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/* UNIX variants. ------------------------------------------- */
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/* Prefer sysctl() over sysconf() except sysctl() HW_REALMEM and HW_PHYSMEM */
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#if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
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int mib[2];
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mib[0] = CTL_HW;
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#if defined(HW_MEMSIZE)
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mib[1] = HW_MEMSIZE; /* OSX. --------------------- */
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#elif defined(HW_PHYSMEM64)
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mib[1] = HW_PHYSMEM64; /* NetBSD, OpenBSD. --------- */
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#endif
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int64_t size = 0; /* 64-bit */
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size_t len = sizeof( size );
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if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 )
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return (unsigned long long) size;
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return 0L; /* Failed? */
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#elif defined(_SC_AIX_REALMEM)
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/* AIX. ----------------------------------------------------- */
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return (unsigned long long) sysconf(_SC_AIX_REALMEM) * (size_t) 1024L;
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#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
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/* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */
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return (unsigned long long) sysconf(_SC_PHYS_PAGES) *
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(unsigned long long) sysconf(_SC_PAGESIZE);
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#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGE_SIZE)
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/* Legacy. -------------------------------------------------- */
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return (unsigned long long) sysconf(_SC_PHYS_PAGES) *
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(unsigned long long) sysconf(_SC_PAGE_SIZE);
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#elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM)) && defined(HAVE_SYS_SYSCTL_H)
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/* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */
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int mib[2];
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mib[0] = CTL_HW;
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#if defined(HW_REALMEM)
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mib[1] = HW_REALMEM; /* FreeBSD. ----------------- */
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#elif defined(HW_PYSMEM)
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mib[1] = HW_PHYSMEM; /* Others. ------------------ */
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#endif
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unsigned long long size = 0; /* 32-bit */
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size_t len = sizeof( size );
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if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 )
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return (unsigned long long) size;
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return 0L; /* Failed? */
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#endif /* sysctl and sysconf variants */
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#else
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return 0L; /* Unknown OS. */
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#endif
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}
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