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118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* mem_freebsd.c - get memory status
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*
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* Copyright (C) 2003 Alexey Dokuchaev <danfe@regency.nsu.ru>
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* Parts are Copyright (C) 1993-2003 FreeBSD Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
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*/
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#include <sys/types.h>
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#include <sys/vmmeter.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "mem_freebsd.h"
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long long int mem_total, mem_used, mem_free, mem_buffers, mem_cached;
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long long int swp_total, swp_used, swp_free;
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static kvm_t *kd;
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struct nlist nlst[] = { {"_cnt"}, {"_bufspace"}, {0} };
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void
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mem_init(void)
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{
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int pagesize;
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if (!(kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open")))
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{
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perror("kvm_open");
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exit(1);
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}
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kvm_nlist(kd, nlst);
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if (!nlst[0].n_type)
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{
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perror("kvm_nlist");
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exit(1);
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}
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seteuid(getuid());
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setegid(getgid());
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if (geteuid() != getuid() || getegid() != getgid())
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{
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perror("sete?id");
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exit(1);
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}
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}
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void
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mem_getfree()
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{
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struct vmmeter vm;
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struct kvm_swap sw;
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int bufspace = 0;
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unsigned long cnt_offset;
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unsigned long bufspace_offset;
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static int firsttime = 1;
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static time_t lasttime = 0;
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time_t curtime;
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if ((kvm_read(kd, nlst[0].n_value, &vm, sizeof(vm))
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!= sizeof(vm)) ||
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(kvm_read(kd, nlst[1].n_value, &bufspace, sizeof(bufspace))
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!= sizeof(bufspace)))
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{
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perror("kvm_read");
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exit(1);
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}
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mem_total = vm.v_page_count;
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mem_free = vm.v_free_count;
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mem_used = mem_total - mem_free;
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mem_cached = vm.v_cache_count;
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mem_buffers = bufspace / vm.v_page_size;
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/*
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* Only calculate when first time or when changes took place.
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* Do not call it more than 1 time per 2 seconds; otherwise
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* it can eat up to 50% of CPU time on heavy swap activity.
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*/
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curtime = time(NULL);
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if (firsttime || curtime > lasttime + 5)
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{
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if (kvm_getswapinfo(kd, &sw, 1, 0) >= 0 &&
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sw.ksw_total)
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{
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swp_total = sw.ksw_total;
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swp_used = sw.ksw_used;
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swp_free = swp_total - swp_used;
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}
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firsttime = 0;
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lasttime = curtime;
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}
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}
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