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
|
/*
* lbcd kernel code for Linux.
*
* Written by Larry Schwimmer
* Copyright 1997, 1998, 2009, 2012
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/system.h>
#include <time.h>
#include <server/internal.h>
#include <util/messages.h>
/*
* Get the current load average from the kernel and return the one minute,
* five minute, and fifteen minute averages in the given parameters. Returns
* 0 on success and -1 on failure.
*/
int
kernel_getload(double *l1, double *l5, double *l15)
{
FILE *fp;
fp = fopen("/proc/loadavg", "r");
if (fp == NULL) {
syswarn("cannot open /proc/loadavg");
return -1;
}
if (fscanf(fp, "%lf %lf %lf", l1, l5, l15) < 3) {
fclose(fp);
warn("cannot parse /proc/loadavg");
return -1;
}
fclose(fp);
return 0;
}
/*
* Get the system uptime and return it in the boottime parameter. Returns 0
* on success and -1 on failure.
*/
int
kernel_getboottime(time_t *boottime)
{
FILE *fp;
double uptime;
time_t curr;
fp = fopen("/proc/uptime", "r");
if (fp == NULL) {
syswarn("cannot open /proc/uptime");
return -1;
}
if (fscanf(fp, "%lf", &uptime) < 1) {
fclose(fp);
warn("cannot parse /proc/uptime");
return -1;
}
fclose(fp);
curr = time(NULL);
*boottime = curr - uptime;
return 0;
}
/*
* Test routine.
*/
#ifdef MAIN
int
main(void)
{
double l1, l5, l15;
time_t boottime;
if (kernel_getload(&l1, &l5, &l15) == 0)
printf("load %.02f %.02f %.02f\n", l1, l5, l15);
if (kernel_getboottime(&boottime) == 0)
printf("booted at %s", ctime(&boottime));
return 0;
}
#endif
|
