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 <time.h>
#include "statgrab.h"
#ifdef SOLARIS
#include <kstat.h>
#include <sys/sysinfo.h>
#include <string.h>
#endif
#ifdef LINUX
#include <stdio.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;
#endif
#ifdef LINUX
        FILE *f;
#endif
        
        cpu_now.user=0;
        /* Not stored in linux */
        cpu_now.iowait=0;
        cpu_now.kernel=0;
        cpu_now.idle=0;
        /* Not stored in linux */
        cpu_now.swap=0;
        cpu_now.total=0;
        /* Not stored in solaris */
        cpu_now.nice=0;

#ifdef SOLARIS
        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+=(long long)cs.cpu_sysinfo.cpu[CPU_USER];
                cpu_now.iowait+=(long long)cs.cpu_sysinfo.cpu[CPU_WAIT];
                cpu_now.kernel+=(long long)cs.cpu_sysinfo.cpu[CPU_KERNEL];
                cpu_now.idle+=(long long)cs.cpu_sysinfo.cpu[CPU_IDLE];
                cpu_now.swap+=(long long)cs.cpu_sysinfo.cpu[CPU_STATES];
        }

        cpu_now.total=cpu_now.user+cpu_now.iowait+cpu_now.kernel+cpu_now.idle+cpu_now.swap;
        
        kstat_close(kc);
#endif
#ifdef LINUX
        if ((f=fopen("/proc/stat", "r" ))==NULL) {
                return NULL;
        }
        /* The very first line should be cpu */
        if((fscanf(f, "cpu %lld %lld %lld %lld", \
                &cpu_now.user, \
                &cpu_now.nice, \
                &cpu_now.kernel, \
                &cpu_now.idle)) != 4){
                return NULL;
        }

        fclose(f);

        cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
#endif

        cpu_now.systime=time(NULL);
        cpu_now_uninit=0;


        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:	1.7
Committed:	Mon Mar 3 15:26:23 2003 UTC (21 years, 2 months ago) by pajs
Content type:	text/plain
Branch:	MAIN
CVS Tags:	LIBSTATGRAB_0_3_3, LIBSTATGRAB_0_3_2, LIBSTATGRAB_0_3_1, LIBSTATGRAB_0_3
Changes since 1.6:	+32 -4 lines
Log Message:	Added linux support for cpu stats
#	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 <time.h>
26			#include "statgrab.h"
27			#ifdef SOLARIS
28			#include <kstat.h>
29			#include <sys/sysinfo.h>
30	pajs	1.6	#include <string.h>
31	pajs	1.1	#endif
32	pajs	1.7	#ifdef LINUX
33			#include <stdio.h>
34			#endif
35	pajs	1.1
36			static cpu_states_t cpu_now;
37			static int cpu_now_uninit=1;
38
39			cpu_states_t *get_cpu_totals(){
40
41			#ifdef SOLARIS
42			kstat_ctl_t *kc;
43			kstat_t *ksp;
44	pajs	1.7	cpu_stat_t cs;
45			#endif
46			#ifdef LINUX
47			FILE *f;
48			#endif
49
50	pajs	1.1	cpu_now.user=0;
51	pajs	1.7	/* Not stored in linux */
52	pajs	1.1	cpu_now.iowait=0;
53			cpu_now.kernel=0;
54			cpu_now.idle=0;
55	pajs	1.7	/* Not stored in linux */
56	pajs	1.1	cpu_now.swap=0;
57			cpu_now.total=0;
58			/* Not stored in solaris */
59			cpu_now.nice=0;
60
61	pajs	1.7	#ifdef SOLARIS
62	pajs	1.1	if ((kc = kstat_open()) == NULL) {
63			return NULL;
64			}
65			for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
66			if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
67			if (kstat_read(kc, ksp, &cs) == -1) {
68			continue;
69			}
70	pajs	1.5	cpu_now.user+=(long long)cs.cpu_sysinfo.cpu[CPU_USER];
71			cpu_now.iowait+=(long long)cs.cpu_sysinfo.cpu[CPU_WAIT];
72			cpu_now.kernel+=(long long)cs.cpu_sysinfo.cpu[CPU_KERNEL];
73			cpu_now.idle+=(long long)cs.cpu_sysinfo.cpu[CPU_IDLE];
74			cpu_now.swap+=(long long)cs.cpu_sysinfo.cpu[CPU_STATES];
75	pajs	1.1	}
76
77			cpu_now.total=cpu_now.user+cpu_now.iowait+cpu_now.kernel+cpu_now.idle+cpu_now.swap;
78	pajs	1.7
79			kstat_close(kc);
80			#endif
81			#ifdef LINUX
82			if ((f=fopen("/proc/stat", "r" ))==NULL) {
83			return NULL;
84			}
85			/* The very first line should be cpu */
86			if((fscanf(f, "cpu %lld %lld %lld %lld", \
87			&cpu_now.user, \
88			&cpu_now.nice, \
89			&cpu_now.kernel, \
90			&cpu_now.idle)) != 4){
91			return NULL;
92			}
93
94			fclose(f);
95	pajs	1.1
96	pajs	1.7	cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
97	pajs	1.1	#endif
98
99			cpu_now.systime=time(NULL);
100	pajs	1.7	cpu_now_uninit=0;
101
102	pajs	1.1
103			return &cpu_now;
104			}
105
106			cpu_states_t *get_cpu_diff(){
107			static cpu_states_t cpu_diff;
108			cpu_states_t cpu_then, *cpu_tmp;
109
110			if (cpu_now_uninit){
111			if((cpu_tmp=get_cpu_totals())==NULL){
112			/* Should get_cpu_totals fail */
113			return NULL;
114			}
115			return cpu_tmp;
116			}
117
118
119			cpu_then.user=cpu_now.user;
120			cpu_then.kernel=cpu_now.kernel;
121			cpu_then.idle=cpu_now.idle;
122			cpu_then.iowait=cpu_now.iowait;
123			cpu_then.swap=cpu_now.swap;
124			cpu_then.nice=cpu_now.nice;
125			cpu_then.total=cpu_now.total;
126			cpu_then.systime=cpu_now.systime;
127
128			if((cpu_tmp=get_cpu_totals())==NULL){
129			return NULL;
130			}
131
132			cpu_diff.user = cpu_now.user - cpu_then.user;
133			cpu_diff.kernel = cpu_now.kernel - cpu_then.kernel;
134			cpu_diff.idle = cpu_now.idle - cpu_then.idle;
135			cpu_diff.iowait = cpu_now.iowait - cpu_then.iowait;
136			cpu_diff.swap = cpu_now.swap - cpu_then.swap;
137			cpu_diff.nice = cpu_now.nice - cpu_then.nice;
138			cpu_diff.total = cpu_now.total - cpu_then.total;
139			cpu_diff.systime = cpu_now.systime - cpu_then.systime;
140
141			return &cpu_diff;
142			}
143
144			cpu_percent_t *cpu_percent_usage(){
145			static cpu_percent_t cpu_usage;
146			cpu_states_t *cs_ptr;
147
148			cs_ptr=get_cpu_diff();
149			if(cs_ptr==NULL){
150			return NULL;
151			}
152
153			cpu_usage.user = ((float)cs_ptr->user / (float)cs_ptr->total)*100;
154			cpu_usage.kernel = ((float)cs_ptr->kernel / (float)cs_ptr->total)*100;
155			cpu_usage.idle = ((float)cs_ptr->idle / (float)cs_ptr->total)*100;
156			cpu_usage.iowait = ((float)cs_ptr->iowait / (float)cs_ptr->total)*100;
157			cpu_usage.swap = ((float)cs_ptr->swap / (float)cs_ptr->total)*100;
158			cpu_usage.nice = ((float)cs_ptr->nice / (float)cs_ptr->total)*100;
159			cpu_usage.time_taken = cs_ptr->systime;
160
161			return &cpu_usage;
162
163			}
164