Show getphysmemsize.c syntax highlighted
/*
* $Id: getphysmemsize.c 12582 2006-12-06 05:22:41Z cbiere $
*
* Copyright (c) 2001-2003, Raphael Manfredi, Richard Eckart
*
*----------------------------------------------------------------------
* This file is part of gtk-gnutella.
*
* gtk-gnutella is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* gtk-gnutella is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with gtk-gnutella; if not, write to the Free Software
* Foundation, Inc.:
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*----------------------------------------------------------------------
*/
/**
* @ingroup core
* @file
*
* Detect available amount of physical RAM.
*
* @author Raphael Manfredi
* @author Richard Eckart
* @date 2001-2003
*/
#include "common.h"
#include "vmm.h"
#if defined(I_SYS_SYSCTL) && defined(HAS_SYSCTL)
#include <sys/sysctl.h>
#endif
#ifdef I_INVENT
#include <invent.h>
#endif
/**
* @return the amount of physical RAM in bytes, or zero in case of failure.
*/
guint64
getphysmemsize(void)
#if defined (_SC_PHYS_PAGES)
{
size_t pagesize = compat_pagesize();
long pages;
errno = 0;
pages = sysconf(_SC_PHYS_PAGES);
if (-1L == pages && 0 != errno) {
g_warning("sysconf(_SC_PHYS_PAGES) failed: %s", g_strerror(errno));
return 0;
}
return pagesize * (guint64) (unsigned long) pages;
}
#elif defined (HAS_SYSCTL) && defined (CTL_HW) && defined (HW_USERMEM64)
{
/* There's also HW_PHYSMEM but HW_USERMEM is better for our needs. */
int mib[2] = { CTL_HW, HW_USERMEM64 };
guint64 amount = 0;
size_t len = sizeof amount;
if (-1 == sysctl(mib, 2, &amount, &len, NULL, 0)) {
g_warning(
"settings_getphysmemsize: sysctl() for HW_USERMEM64 failed: %s",
g_strerror(errno));
return 0;
}
return amount;
}
#elif defined (HAS_SYSCTL) && defined (CTL_HW) && defined (HW_USERMEM)
{
/* There's also HW_PHYSMEM but HW_USERMEM is better for our needs. */
int mib[2] = { CTL_HW, HW_USERMEM };
guint32 amount = 0;
size_t len = sizeof amount;
if (-1 == sysctl(mib, 2, &amount, &len, NULL, 0)) {
g_warning(
"settings_getphysmemsize: sysctl() for HW_USERMEM failed: %s",
g_strerror(errno));
return 0;
}
return amount;
}
#elif defined (HAS_GETINVENT)
{
inventory_t *inv;
long physmem = 0;
if (-1 == setinvent()) {
g_warning("settings_getphysmemsize: setinvent() failed: %s",
g_strerror(errno));
return 0;
}
errno = 0;
while ((inv = getinvent()) != NULL) {
if (inv->inv_class == INV_MEMORY && inv->inv_type == INV_MAIN_MB) {
physmem = inv->inv_state;
break;
}
}
endinvent();
if (-1L == physmem && 0 != errno) {
g_warning("settings_getphysmemsize: "
"getinvent() for INV_MEMORY faild: %s", g_strerror(errno));
return 0;
}
return (guint64) (unsigned long) physmem * 1024 * 1024;
}
#else /* ! _SC_PHYS_PAGES && ! HAS_SYSCTL && ! HAS_GETINVENT */
{
g_warning("Unable to determine amount of physical RAM");
return 0;
}
#endif /* _SC_PHYS_PAGES */
/* vi: set ts=4 sw=4 cindent: */
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