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      1 char   netcpu_sysctl_id[]="\
      2 @(#)netcpu_sysctl.c  Version 2.6.0";
      3 
      4 #if HAVE_CONFIG_H
      5 # include <config.h>
      6 #endif
      7 
      8 #include <stdio.h>
      9 #include <unistd.h>
     10 
     11 #if HAVE_INTTYPES_H
     12 # include <inttypes.h>
     13 #else
     14 # if HAVE_STDINT_H
     15 #  include <stdint.h>
     16 # endif
     17 #endif
     18 
     19 #if TIME_WITH_SYS_TIME
     20 # include <sys/time.h>
     21 # include <time.h>
     22 #else
     23 # if HAVE_SYS_TIME_H
     24 #  include <sys/time.h>
     25 # else
     26 #  include <time.h>
     27 # endif
     28 #endif
     29 #if HAVE_LIMITS_H
     30 # include <limits.h>
     31 # ifndef LONG_LONG_MAX
     32 #  define LONG_LONG_MAX LLONG_MAX
     33 # endif /* LONG_LONG_MAX */
     34 #endif
     35 
     36 #ifdef __NetBSD__
     37 #define	CP_TIME_TYPE	uint64_t
     38 #else
     39 #define	CP_TIME_TYPE	long
     40 #endif
     41 
     42 #include <errno.h>
     43 
     44 /* need to have some sort of check for sys/sysctl.h versus sysctl.h */
     45 #include <sys/sysctl.h>
     46 
     47 
     48 /* this has been liberally cut and pasted from <sys/resource.h> on
     49    FreeBSD. in general, this would be a bad idea, but I don't want to
     50    have to do a _KERNEL define to get these and that is what
     51    sys/resource.h seems to want. raj 2002-03-03 */
     52 #define CP_USER         0
     53 #define CP_NICE         1
     54 #define CP_SYS          2
     55 #define CP_INTR         3
     56 #define CP_IDLE         4
     57 #define CPUSTATES       5
     58 
     59 
     60 #include "netsh.h"
     61 #include "netlib.h"
     62 
     63 static CP_TIME_TYPE lib_start_count[CPUSTATES];
     64 static CP_TIME_TYPE lib_end_count[CPUSTATES];
     65 
     66 void
     67 cpu_util_init(void)
     68 {
     69   return;
     70 }
     71 
     72 void
     73 cpu_util_terminate(void)
     74 {
     75   return;
     76 }
     77 
     78 int
     79 get_cpu_method(void)
     80 {
     81   return SYSCTL;
     82 }
     83 
     84 static void
     85 get_cpu_time(CP_TIME_TYPE *cpu_time)
     86 {
     87   size_t cpu_time_len = CPUSTATES * sizeof (cpu_time[0]);
     88 
     89   if (sysctlbyname("kern.cp_time", cpu_time, &cpu_time_len, NULL, 0) == -1) {
     90       fprintf (stderr, "Cannot get CPU time!\n");
     91       exit (1);
     92   }
     93 }
     94 
     95 /* calibrate_sysctl  - perform the idle rate calculation using the
     96    sysctl call - typically on BSD */
     97 
     98 float
     99 calibrate_idle_rate(int iterations, int interval)
    100 {
    101   return sysconf (_SC_CLK_TCK);
    102 }
    103 
    104 float
    105 calc_cpu_util_internal(float elapsed_time)
    106 {
    107   CP_TIME_TYPE sum_idle, sum_busy;
    108   int i;
    109 
    110   memset(&lib_local_cpu_stats, 0, sizeof(lib_local_cpu_stats));
    111 
    112   for (sum_busy = 0, i = 0; i < CPUSTATES; i++) {
    113     if (i != CP_IDLE)
    114       sum_busy += lib_end_count[i] - lib_start_count[i];
    115   }
    116 
    117   sum_idle = lib_end_count[CP_IDLE] - lib_start_count[CP_IDLE];
    118   lib_local_cpu_stats.cpu_util = (float)sum_busy / (float)(sum_busy + sum_idle);
    119   lib_local_cpu_stats.cpu_util *= 100.0;
    120 
    121   return lib_local_cpu_stats.cpu_util;
    122 
    123 }
    124 void
    125 cpu_start_internal(void)
    126 {
    127   get_cpu_time(lib_start_count);
    128 }
    129 
    130 void
    131 cpu_stop_internal(void)
    132 {
    133   get_cpu_time(lib_end_count);
    134 }
    135