1 /*
2 * Copyright (c) 2001-2007 Willem Dijkstra
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following
13 * disclaimer in the documentation and/or other materials provided
14 * with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
26 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 *
29 */
30
31 /*
32 * Get current cpu statistics in percentages (total of all counts = 100.0)
33 * and returns them in symon_buf as
34 *
35 * user : nice : system : interrupt : idle
36 *
37 * This module uses the sysctl interface and can run as any user.
38 */
39
40 #include "conf.h"
41
42 #include <sys/dkstat.h>
43 #include <sys/param.h>
44 #include <sys/sysctl.h>
45
46 #include <errno.h>
47 #include <limits.h>
48 #include <stdlib.h>
49 #include <string.h>
50
51 #include "error.h"
52 #include "percentages.h"
53 #include "symon.h"
54
55 void
init_cpu(struct stream * st)56 init_cpu(struct stream *st)
57 {
58 char buf[SYMON_MAX_OBJSIZE];
59 #ifdef HAS_KERN_CPTIME2
60 const char *errstr;
61 int mib[2] = {CTL_HW, HW_NCPU};
62 int ncpu;
63 long num;
64 size_t size = sizeof(ncpu);
65 #endif
66
67 st->parg.cp.mib[0] = CTL_KERN;
68 st->parg.cp.mib[1] = KERN_CPTIME;
69 st->parg.cp.miblen = 2;
70
71 #ifdef HAS_KERN_CPTIME2
72 if (sysctl(mib, 2, &ncpu, &size, NULL, 0) == -1) {
73 warning("could not determine number of cpus: %.200s", strerror(errno));
74 ncpu = 1;
75 }
76
77 num = strtonum(st->arg, 0, SYMON_MAXCPUID - 1, &errstr);
78 if (errstr != NULL) {
79 fatal("cpu(%.200s) is invalid: %.200s", st->arg, errstr);
80 }
81
82 if (ncpu > 1) {
83 st->parg.cp.mib[0] = CTL_KERN;
84 st->parg.cp.mib[1] = KERN_CPTIME2;
85 st->parg.cp.mib[2] = num;
86 st->parg.cp.miblen = 3;
87 if (st->parg.cp.mib[2] >= ncpu) {
88 fatal("cpu(%d) is not present", st->parg.cp.mib[2]);
89 }
90 }
91 #endif
92
93 /* Call get_cpu once to fill the cp_old structure */
94 get_cpu(buf, sizeof(buf), st);
95
96 info("started module cpu(%.200s)", st->arg);
97 }
98
99 void
gets_cpu()100 gets_cpu()
101 {
102 /* EMPTY */
103 }
104
105 int
get_cpu(char * symon_buf,int maxlen,struct stream * st)106 get_cpu(char *symon_buf, int maxlen, struct stream *st)
107 {
108 int i, total;
109 size_t len;
110
111 len = sizeof(st->parg.cp.time2);
112 if (sysctl(st->parg.cp.mib, st->parg.cp.miblen, &st->parg.cp.time2, &len, NULL, 0) < 0) {
113 warning("%s:%d: sysctl kern.cp_time* for cpu%d failed", __FILE__, __LINE__,
114 st->parg.cp.mib[2]);
115 return 0;
116 }
117
118 /* sysctl will return 32 bit longs for CPTIME and 64 bit longs for CPTIME2 */
119 if (st->parg.cp.mib[1] == KERN_CPTIME) {
120 bcopy(st->parg.cp.time2, st->parg.cp.time1, sizeof(st->parg.cp.time1));
121 for (i = 0; i < CPUSTATES; i++) {
122 st->parg.cp.time2[i] = (int64_t) st->parg.cp.time1[i];
123 }
124 }
125
126 /* convert cp_time counts to percentages */
127 total = percentages(CPUSTATES, st->parg.cp.states, st->parg.cp.time2, st->parg.cp.old, st->parg.cp.diff);
128
129 return snpack(symon_buf, maxlen, st->arg, MT_CPU,
130 (double) (st->parg.cp.states[CP_USER] / 10.0),
131 (double) (st->parg.cp.states[CP_NICE] / 10.0),
132 (double) (st->parg.cp.states[CP_SYS] / 10.0),
133 (double) (st->parg.cp.states[CP_INTR] / 10.0),
134 (double) (st->parg.cp.states[CP_IDLE] / 10.0));
135 }
136