src/libstatgrab/cpu_stats.c

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * 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 Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <ukcprog.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <time.h>
#include <string.h>
#include "statgrab.h"
#ifdef SOLARIS
#include <kstat.h>
#include <sys/sysinfo.h>
#endif
#ifdef FREEBSD
#include <sys/sysctl.h>
#include <sys/dkstat.h>
#endif

static cpu_states_t cpu_now;
static int cpu_now_uninit=1;

cpu_states_t *get_cpu_totals(){

#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        cpu_stat_t cs;

        cpu_now.user=0;
        cpu_now.iowait=0;
        cpu_now.kernel=0;
        cpu_now.idle=0;
        cpu_now.swap=0;
        cpu_now.total=0;
        /* Not stored in solaris */
        cpu_now.nice=0;

        if ((kc = kstat_open()) == NULL) {
                return NULL;
        }
        for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
                if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
                if (kstat_read(kc, ksp, &cs) == -1) {
                        continue;
                }
                cpu_now.user+=cs.cpu_sysinfo.cpu[CPU_USER];
                cpu_now.iowait+=cs.cpu_sysinfo.cpu[CPU_WAIT];
                cpu_now.kernel+=cs.cpu_sysinfo.cpu[CPU_KERNEL];
                cpu_now.idle+=cs.cpu_sysinfo.cpu[CPU_IDLE];
                cpu_now.swap+=cs.cpu_sysinfo.cpu[CPU_STATES];
        }

        cpu_now.total=cpu_now.user+cpu_now.iowait+cpu_now.kernel+cpu_now.idle+cpu_now.swap;
        cpu_now_uninit=0;

        kstat_close(kc);
#endif

        cpu_now.systime=time(NULL);

        return &cpu_now;
}

cpu_states_t *get_cpu_diff(){
        static cpu_states_t cpu_diff;
        cpu_states_t cpu_then, *cpu_tmp;

        if (cpu_now_uninit){
                if((cpu_tmp=get_cpu_totals())==NULL){
                /* Should get_cpu_totals fail */
                        return NULL;
                }
                return cpu_tmp;
        }


        cpu_then.user=cpu_now.user;
        cpu_then.kernel=cpu_now.kernel;
        cpu_then.idle=cpu_now.idle;
        cpu_then.iowait=cpu_now.iowait;
        cpu_then.swap=cpu_now.swap;
        cpu_then.nice=cpu_now.nice;
        cpu_then.total=cpu_now.total;
        cpu_then.systime=cpu_now.systime;

        if((cpu_tmp=get_cpu_totals())==NULL){
                return NULL;
        }

        cpu_diff.user = cpu_now.user - cpu_then.user;
        cpu_diff.kernel = cpu_now.kernel - cpu_then.kernel;
        cpu_diff.idle = cpu_now.idle - cpu_then.idle;
        cpu_diff.iowait = cpu_now.iowait - cpu_then.iowait;
        cpu_diff.swap = cpu_now.swap - cpu_then.swap;
        cpu_diff.nice = cpu_now.nice - cpu_then.nice;
        cpu_diff.total = cpu_now.total - cpu_then.total;
        cpu_diff.systime = cpu_now.systime - cpu_then.systime;

        return &cpu_diff;
}

cpu_percent_t *cpu_percent_usage(){
        static cpu_percent_t cpu_usage;
        cpu_states_t *cs_ptr;

        cs_ptr=get_cpu_diff();
        if(cs_ptr==NULL){
                return NULL;
        }

        cpu_usage.user =  ((float)cs_ptr->user / (float)cs_ptr->total)*100;
        cpu_usage.kernel =  ((float)cs_ptr->kernel / (float)cs_ptr->total)*100;
        cpu_usage.idle = ((float)cs_ptr->idle / (float)cs_ptr->total)*100;
        cpu_usage.iowait = ((float)cs_ptr->iowait / (float)cs_ptr->total)*100;
        cpu_usage.swap = ((float)cs_ptr->swap / (float)cs_ptr->total)*100;
        cpu_usage.nice = ((float)cs_ptr->nice / (float)cs_ptr->total)*100;
        cpu_usage.time_taken = cs_ptr->systime;

        return &cpu_usage;

}

Revision:	1.2
Committed:	Tue Feb 18 23:23:36 2003 UTC (21 years, 3 months ago) by pajs
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+1 -5 lines
Log Message:	Changed the kstat_close to not return NULL in event of a failure. If we cant close it, well there is nothing i can do about that, so i may as well at least return something useful since its done all the hardwork by that point. And anywan, it should never fail to close :)
#	User	Rev	Content
1	pajs	1.1	/*
2			* i-scream central monitoring system
3			* http://www.i-scream.org.uk
4			* Copyright (C) 2000-2002 i-scream
5			*
6			* This program is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19			*/
20
21			#ifdef HAVE_CONFIG_H
22			#include "config.h"
23			#endif
24
25			#include <stdio.h>
26			#include <ukcprog.h>
27			#include <unistd.h>
28			#include <stdlib.h>
29			#include <sys/types.h>
30			#include <time.h>
31			#include <string.h>
32			#include "statgrab.h"
33			#ifdef SOLARIS
34			#include <kstat.h>
35			#include <sys/sysinfo.h>
36			#endif
37			#ifdef FREEBSD
38			#include <sys/sysctl.h>
39			#include <sys/dkstat.h>
40			#endif
41
42			static cpu_states_t cpu_now;
43			static int cpu_now_uninit=1;
44
45			cpu_states_t *get_cpu_totals(){
46
47			#ifdef SOLARIS
48			kstat_ctl_t *kc;
49			kstat_t *ksp;
50			cpu_stat_t cs;
51
52			cpu_now.user=0;
53			cpu_now.iowait=0;
54			cpu_now.kernel=0;
55			cpu_now.idle=0;
56			cpu_now.swap=0;
57			cpu_now.total=0;
58			/* Not stored in solaris */
59			cpu_now.nice=0;
60
61			if ((kc = kstat_open()) == NULL) {
62			return NULL;
63			}
64			for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
65			if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
66			if (kstat_read(kc, ksp, &cs) == -1) {
67			continue;
68			}
69			cpu_now.user+=cs.cpu_sysinfo.cpu[CPU_USER];
70			cpu_now.iowait+=cs.cpu_sysinfo.cpu[CPU_WAIT];
71			cpu_now.kernel+=cs.cpu_sysinfo.cpu[CPU_KERNEL];
72			cpu_now.idle+=cs.cpu_sysinfo.cpu[CPU_IDLE];
73			cpu_now.swap+=cs.cpu_sysinfo.cpu[CPU_STATES];
74			}
75
76			cpu_now.total=cpu_now.user+cpu_now.iowait+cpu_now.kernel+cpu_now.idle+cpu_now.swap;
77			cpu_now_uninit=0;
78
79	pajs	1.2	kstat_close(kc);
80	pajs	1.1	#endif
81
82			cpu_now.systime=time(NULL);
83
84			return &cpu_now;
85			}
86
87			cpu_states_t *get_cpu_diff(){
88			static cpu_states_t cpu_diff;
89			cpu_states_t cpu_then, *cpu_tmp;
90
91			if (cpu_now_uninit){
92			if((cpu_tmp=get_cpu_totals())==NULL){
93			/* Should get_cpu_totals fail */
94			return NULL;
95			}
96			return cpu_tmp;
97			}
98
99
100			cpu_then.user=cpu_now.user;
101			cpu_then.kernel=cpu_now.kernel;
102			cpu_then.idle=cpu_now.idle;
103			cpu_then.iowait=cpu_now.iowait;
104			cpu_then.swap=cpu_now.swap;
105			cpu_then.nice=cpu_now.nice;
106			cpu_then.total=cpu_now.total;
107			cpu_then.systime=cpu_now.systime;
108
109			if((cpu_tmp=get_cpu_totals())==NULL){
110			return NULL;
111			}
112
113			cpu_diff.user = cpu_now.user - cpu_then.user;
114			cpu_diff.kernel = cpu_now.kernel - cpu_then.kernel;
115			cpu_diff.idle = cpu_now.idle - cpu_then.idle;
116			cpu_diff.iowait = cpu_now.iowait - cpu_then.iowait;
117			cpu_diff.swap = cpu_now.swap - cpu_then.swap;
118			cpu_diff.nice = cpu_now.nice - cpu_then.nice;
119			cpu_diff.total = cpu_now.total - cpu_then.total;
120			cpu_diff.systime = cpu_now.systime - cpu_then.systime;
121
122			return &cpu_diff;
123			}
124
125			cpu_percent_t *cpu_percent_usage(){
126			static cpu_percent_t cpu_usage;
127			cpu_states_t *cs_ptr;
128
129			cs_ptr=get_cpu_diff();
130			if(cs_ptr==NULL){
131			return NULL;
132			}
133
134			cpu_usage.user = ((float)cs_ptr->user / (float)cs_ptr->total)*100;
135			cpu_usage.kernel = ((float)cs_ptr->kernel / (float)cs_ptr->total)*100;
136			cpu_usage.idle = ((float)cs_ptr->idle / (float)cs_ptr->total)*100;
137			cpu_usage.iowait = ((float)cs_ptr->iowait / (float)cs_ptr->total)*100;
138			cpu_usage.swap = ((float)cs_ptr->swap / (float)cs_ptr->total)*100;
139			cpu_usage.nice = ((float)cs_ptr->nice / (float)cs_ptr->total)*100;
140			cpu_usage.time_taken = cs_ptr->systime;
141
142			return &cpu_usage;
143
144			}
145