File: sys_freebsd.c

package info (click to toggle)
bfm 0.6.4-5
  • links: PTS
  • area: main
  • in suites: wheezy
  • size: 412 kB
  • sloc: ansic: 5,239; makefile: 155
file content (209 lines) | stat: -rw-r--r-- 5,216 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/*  BubbleMon dockapp 1.2 - FreeBSD specific code
 *  Copyright (C) 2001, oleg dashevskii <od@iclub.nsu.ru>
 *  
 *  This program 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.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
 *
 */

#include <kvm.h>
#include <fcntl.h>
#include <sys/dkstat.h>
#include <sys/vmmeter.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <vm/vm_param.h>
#include <time.h>
#include "include/bubblemon.h"
#include "include/sys_include.h"

extern BubbleMonData bm;

static kvm_t *kd = NULL;
static struct nlist nlst[] = {
    {"_cp_time", 0},
    {"_cnt", 0},
    {"_bufspace", 0},
    {0, 0}
};
static int pageshift;

#define pagetob(size) ((size) << pageshift)

int init_stuff()
{
    /* calculate page shift to convert pages into kilobytes */
    int pagesize = getpagesize();
    pageshift = 0;

    while (pagesize > 1) {
	pageshift++;
	pagesize >>= 1;
    }

    /* open kernel memory */
    kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open");

    if (kd == NULL) {
	puts("Could not open kernel virtual memory");
	return 1;
    }

    kvm_nlist(kd, nlst);

    if (nlst[0].n_type == 0 || nlst[1].n_type == 0 || nlst[2].n_type == 0) {
	puts("Error extracting symbols");
	return 2;
    }

    /* drop setgid & setuid (the latter should not be there really) */
    seteuid(getuid());
    setegid(getgid());

    if (geteuid() != getuid() || getegid() != getgid()) {
	puts("Unable to drop privileges");
	return 3;
    }

    return 0;
}

/* Returns the current CPU load in percent */
int system_cpu(void)
{
    int loadPercentage;
    int previous_total, previous_load;
    int total, load;
    unsigned long int cpu_time[CPUSTATES];
    int i;

    if (kvm_read(kd, nlst[0].n_value, &cpu_time, sizeof(cpu_time))
	!= sizeof(cpu_time))
	return 0;

    load = cpu_time[CP_USER] + cpu_time[CP_SYS] + cpu_time[CP_NICE];
    total = load + cpu_time[CP_IDLE];

    i = bm.loadIndex;
    previous_load = bm.load[i];
    previous_total = bm.total[i];

    bm.load[i] = load;
    bm.total[i] = total;
    bm.loadIndex = (i + 1) % bm.samples;

    if (previous_total == 0)
	loadPercentage = 0;	/* first time here */
    else
	if (total == previous_total)
	    loadPercentage = 100;
    	else
	    loadPercentage = (100 * (load - previous_load)) /
	    	(total - previous_total);

    return loadPercentage;
}

int system_memory(void)
{
    u_int64_t my_mem_used, my_mem_max;
    u_int64_t my_swap_used, my_swap_max;
    struct vmmeter sum;
    int bufspace;
    static int swappgsin = -1;
    static int swappgsout = -1;
    static int swap_firsttime = 1;
    static int swapavail = 0, swapused = 0;
    static time_t last_time_swap = 0;
    time_t curr_time;
	
    if (kvm_read(kd, nlst[1].n_value, &sum, sizeof(sum)) != sizeof(sum))
	return 0;		/* _cnt */

    if (kvm_read(kd, nlst[2].n_value, &bufspace, sizeof(bufspace)) !=
	sizeof(bufspace))
	return 0;		/* _bufspace */

    my_mem_max = pagetob((u_int64_t) sum.v_page_count);
    my_mem_used = pagetob((u_int64_t) sum.v_active_count);

    /* only calculate when first time or when changes took place */
    /* do not call it more than 1 time per 2 seconds */
    /* otherwise it can eat up to 50% of CPU time on heavy swap activity */
    curr_time = time(NULL);
    
    if (swap_firsttime ||
	(((sum.v_swappgsin > swappgsin) || (sum.v_swappgsout > swappgsout)) &&
	curr_time > last_time_swap + 1)) {
	
	struct kvm_swap swap;
	int n;

	swapavail = 0;
	swapused = 0;

	n = kvm_getswapinfo(kd, &swap, 1, 0);
	if (n >= 0 && swap.ksw_total != 0) {
	    swapavail = pagetob(swap.ksw_total);
	    swapused = pagetob(swap.ksw_used);
	}

	swap_firsttime = 0;
	last_time_swap = curr_time;
    }

    my_swap_used = swapused;
    my_swap_max = swapavail;

    swappgsin = sum.v_swappgsin;
    swappgsout = sum.v_swappgsout;

    bm.mem_used = my_mem_used;
    bm.mem_max = my_mem_max;
    bm.swap_used = my_swap_used;
    bm.swap_max = my_swap_max;
    return 1;
}

#ifdef ENABLE_MEMSCREEN
void system_loadavg(void)
{
    static int avg_delay;

    if (avg_delay-- <= 0) {
	struct loadavg loadinfo;
        int i, mib[2];
	size_t size;

	mib[0] = CTL_VM;
	mib[1] = VM_LOADAVG;
	size = sizeof (loadinfo);
	
	if (sysctl(mib, 2, &loadinfo, &size, NULL, 0) >= 0)
	    for (i = 0; i < 3; i++) {
	    	bm.loadavg[i].i = loadinfo.ldavg[i] / loadinfo.fscale;
	    	bm.loadavg[i].f = ((loadinfo.ldavg[i] * 100 + 
			loadinfo.fscale / 2) / loadinfo.fscale) % 100;
	    }

	avg_delay = ROLLVALUE;
    }
}
#endif				/* ENABLE_MEMSCREEN */

/* ex:set ts=8: */