HostInfoBsd.h

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// # Copyright (C) 2009
// # Associated Universities, Inc. Washington DC, USA.
// #
// # This library is free software; you can redistribute it and/or modify it
// # under the terms of the GNU Library General Public License as published by
// # the Free Software Foundation; either version 2 of the License, or (at your
// # option) any later version.
// #
// # This library 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 Library General Public
// # License for more details.
// #
// # You should have received a copy of the GNU Library General Public License
// # along with this library; if not, write to the Free Software Foundation,
// # Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
// #
// # Correspondence concerning AIPS++ should be addressed as follows:
// #        Internet email: casa-feedback@nrao.edu.
// #        Postal address: AIPS++ Project Office
// #                        National Radio Astronomy Observatory
// #                        520 Edgemont Road
// #                        Charlottesville, VA 22903-2475 USA
/*
** Author Tony Maher
**
** Based on HostInfoDarwin.h (just the scaffolding code).
*/
 
#ifndef CASA_HOSTINFOBSD_H
#define CASA_HOSTINFOBSD_H
 
#if defined(HOSTINFO_DO_IMPLEMENT)
 
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>  // struct vmtotal
 
#include <fcntl.h>
#include <kvm.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
namespace casacore {  // # NAMESPACE CASACORE - BEGIN
 
// <summary>
// HostInfo for BSD (FreeBSD) machines.
// </summary>
 
// <use visibility=local>
 
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="" demos="">
// </reviewed>
 
// <prerequisite>
//   <li> <linkto class=HostInfo>HostInfo</linkto>
// </prerequisite>
 
// <synopsis>
// This file provides the BSD (FreeBSD) specific functions for HostInfo.
// It is selectively included by HostInfo.cc.
// </synopsis>
//
// <group name="HostInfo">
 
// these are for getting the memory statistics
static int pagesize;
static int page_kb;
 
class HostMachineInfo {
  friend class HostInfo;
 
  HostMachineInfo();
  void update_info();
 
  int valid;
  int cpus;
 
  ptrdiff_t memory_total;
  ptrdiff_t memory_used;
  ptrdiff_t memory_free;
 
  ptrdiff_t swap_total;
  ptrdiff_t swap_used;
  ptrdiff_t swap_free;
};
 
// </group>
 
HostMachineInfo::HostMachineInfo() : valid(1) {
  size_t len;
 
  pagesize = getpagesize();   // size of page in bytes.
  page_kb = pagesize / 1024;  // in kilobytes.
 
  len = sizeof(cpus);
  if (sysctlbyname("hw.ncpu", &cpus, &len, NULL, 0) == -1) perror("sysctl");
 
  len = sizeof(memory_total);
  if (sysctlbyname("hw.physmem", &memory_total, &len, NULL, 0) == -1)
    perror("sysctl");
  else
    memory_total /= 1024;  // in kilobytes
}
 
void HostMachineInfo::update_info() {
  size_t len;
  kvm_t *kd;
  struct vmtotal total;
  struct kvm_swap swapary[1];
 
  // Memory and swap values are in pages.
 
  len = sizeof(total);
  if (sysctlbyname("vm.vmtotal", &total, &len, NULL, 0) == -1)
    perror("sysctl");
  else
    memory_used = total.t_rm * page_kb;
  memory_free = total.t_free * page_kb;
 
  kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY, "kvm_open");
  if (kd != NULL) {
    kvm_getswapinfo(kd, swapary, 1, 0);
 
    swap_total = swapary[0].ksw_total * page_kb;
    swap_used = swapary[0].ksw_used * page_kb;
    swap_free = swap_total - swap_used;
  }
}
 
}  // namespace casacore
 
#endif
#endif