wmcpuload/src/cpu_solaris.c

   1 /*
   2  * cpu_solaric.c - module to get cpu usage, for Solaris
   3  *
   4  * Copyright (C) 2001 Jonathan Lang <lang@synopsys.com>
   5  * Copyright (C) 2002 Seiichi SATO <ssato@sh.rim.or.jp>
   6  *
   7  * licensed under the GPL
   8  */
   9
  10 #ifdef HAVE_CONFIG_H
  11 #include "config.h"
  12 #endif
  13
  14 #include <stdio.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include "cpu.h"
  19
  20 #include <kstat.h>
  21 #include <sys/cpuvar.h>
  22 #include <sys/sysinfo.h>
  23
  24 kstat_t **cpu_ks;
  25 cpu_stat_t *cpu_stat;
  26
  27 void
  28 cpu_init(void)
  29 {
  30     /* You don't need initialization under solaris */
  31     return;
  32 }
  33
  34 /* returns current CPU usage in percent */
  35 int
  36 cpu_get_usage(cpu_options *opts)
  37 {
  38     static long oldload, oldtotal;
  39     long cpuload, cputotal;
  40     int result, ncpus, i;
  41     kstat_ctl_t *kc;
  42     kstat_named_t *kn;
  43     kstat_t *ks;
  44
  45     kc = kstat_open();
  46     if (!kc) {
  47         perror("kstat_open");
  48         exit(1);
  49     }
  50
  51     ks = kstat_lookup(kc, "unix", 0, "system_misc");
  52     if (kstat_read(kc, ks, NULL) == -1) {
  53         perror("kstat_read");
  54         exit(1);
  55     }
  56
  57     /*
  58      *  Find out how many CPUs the machine has
  59      */
  60     kn = kstat_data_lookup(ks, "ncpus");
  61     ncpus = kn->value.ul;
  62
  63     /*
  64      *  Get CPU usage stats.
  65      */
  66     cpu_ks = (kstat_t **) realloc(cpu_ks, ncpus * sizeof(kstat_t *));
  67     cpu_stat =
  68         (cpu_stat_t *) realloc(cpu_stat, ncpus * sizeof(cpu_stat_t));
  69
  70     for (i = 0, ks = kc->kc_chain; ks; ks = ks->ks_next) {
  71         if (strncmp(ks->ks_name, "cpu_stat", 8) == 0)
  72             cpu_ks[i++] = ks;
  73     }
  74
  75     for (i = 0; i < ncpus; ++i)
  76         (void) kstat_read(kc, cpu_ks[i], &cpu_stat[i]);
  77
  78     /*
  79      *  Sum the times for the various non-idle CPU_STATES, for Solaris the
  80      *  CPU_STATES are:
  81      *
  82      *    CPU_IDLE        0
  83      *    CPU_USER        1
  84      *    CPU_KERNEL      2
  85      *    CPU_WAIT        3
  86      */
  87     for (cpuload = 0, i = 0; i < ncpus; ++i) {
  88         cpuload += (long) cpu_stat[i].cpu_sysinfo.cpu[CPU_USER];
  89         cpuload += (long) cpu_stat[i].cpu_sysinfo.cpu[CPU_KERNEL];
  90         cpuload += (long) cpu_stat[i].cpu_sysinfo.cpu[CPU_WAIT];
  91     }
  92
  93     /*
  94      *  Total Time
  95      */
  96     for (cputotal = cpuload, i = 0; i < ncpus; ++i)
  97         cputotal += (long) cpu_stat[i].cpu_sysinfo.cpu[CPU_IDLE];
  98
  99     kstat_close(kc);
 100
 101     if (oldtotal == 0) {
 102         result = 0;
 103     } else if ((cputotal - oldtotal) > 0) {
 104         result = (100 * (double) (cpuload - oldload)) /
 105                         (double) (cputotal - oldtotal);
 106     } else if (cputotal == oldtotal) {
 107         result = 0;
 108     } else
 109         result = 0;
 110
 111     oldload = cpuload;
 112     oldtotal = cputotal;
 113
 114     return result;
 115 }