src/libstatgrab/cpu_stats.c

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org
 * Copyright (C) 2000-2003 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
#if defined(LINUX) || defined(CYGWIN)
#include <stdio.h>
#endif
#ifdef FREEBSD
#include <sys/sysctl.h>
#include <sys/dkstat.h>
#endif
#ifdef NETBSD
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/sched.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
#ifdef ALLBSD
#ifndef FREEBSD
        int mib[2];
#endif
#ifdef NETBSD
        u_int64_t cp_time[CPUSTATES];
#else
        long cp_time[CPUSTATES];
#endif
        size_t size;
#endif
        
        cpu_now.user=0;
        /* Not stored in linux or freebsd */
        cpu_now.iowait=0;
        cpu_now.kernel=0;
        cpu_now.idle=0;
        /* Not stored in linux or freebsd */
        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
#if defined(LINUX) || defined(CYGWIN)
        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){
                fclose(f);
                return NULL;
        }

        fclose(f);

        cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
#endif
#ifdef ALLBSD
#ifdef FREEBSD
        size = sizeof cp_time;
        if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) < 0){
                return NULL;
        }
#else
        mib[0] = CTL_KERN;
        mib[1] = KERN_CP_TIME;
        size = sizeof cp_time;
        if (sysctl(mib, 2, &cp_time, &size, NULL, 0) < 0) {
                return NULL;
        }
#endif

        cpu_now.user=cp_time[CP_USER];
        cpu_now.nice=cp_time[CP_NICE];
        cpu_now.kernel=cp_time[CP_SYS];
        cpu_now.idle=cp_time[CP_IDLE];
        
        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:	1.14
Committed:	Mon Nov 10 23:25:45 2003 UTC (20 years, 6 months ago) by ats
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+2 -2 lines
Log Message:	Make Cygwin its own platform, rather than defining LINUX. This stops libstatgrab from trying to fetch stats that Cygwin doesn't have.
#	User	Rev	Content
1	pajs	1.1	/*
2			* i-scream central monitoring system
3	tdb	1.10	* http://www.i-scream.org
4			* Copyright (C) 2000-2003 i-scream
5	pajs	1.1	*
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	ats	1.14	#if defined(LINUX) \|\| defined(CYGWIN)
33	pajs	1.7	#include <stdio.h>
34			#endif
35	pajs	1.9	#ifdef FREEBSD
36			#include <sys/sysctl.h>
37			#include <sys/dkstat.h>
38			#endif
39	ats	1.13	#ifdef NETBSD
40			#include <sys/types.h>
41			#include <sys/param.h>
42			#include <sys/sysctl.h>
43			#include <sys/sched.h>
44			#endif
45	pajs	1.1
46			static cpu_states_t cpu_now;
47			static int cpu_now_uninit=1;
48
49			cpu_states_t *get_cpu_totals(){
50
51			#ifdef SOLARIS
52			kstat_ctl_t *kc;
53			kstat_t *ksp;
54	pajs	1.7	cpu_stat_t cs;
55			#endif
56			#ifdef LINUX
57			FILE *f;
58			#endif
59	ats	1.13	#ifdef ALLBSD
60			#ifndef FREEBSD
61			int mib[2];
62			#endif
63			#ifdef NETBSD
64			u_int64_t cp_time[CPUSTATES];
65			#else
66	pajs	1.9	long cp_time[CPUSTATES];
67	ats	1.13	#endif
68	pajs	1.9	size_t size;
69			#endif
70	pajs	1.7
71	pajs	1.1	cpu_now.user=0;
72	pajs	1.9	/* Not stored in linux or freebsd */
73	pajs	1.1	cpu_now.iowait=0;
74			cpu_now.kernel=0;
75			cpu_now.idle=0;
76	pajs	1.9	/* Not stored in linux or freebsd */
77	pajs	1.1	cpu_now.swap=0;
78			cpu_now.total=0;
79			/* Not stored in solaris */
80			cpu_now.nice=0;
81
82	pajs	1.7	#ifdef SOLARIS
83	pajs	1.1	if ((kc = kstat_open()) == NULL) {
84			return NULL;
85			}
86			for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
87			if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
88			if (kstat_read(kc, ksp, &cs) == -1) {
89			continue;
90			}
91	pajs	1.5	cpu_now.user+=(long long)cs.cpu_sysinfo.cpu[CPU_USER];
92			cpu_now.iowait+=(long long)cs.cpu_sysinfo.cpu[CPU_WAIT];
93			cpu_now.kernel+=(long long)cs.cpu_sysinfo.cpu[CPU_KERNEL];
94			cpu_now.idle+=(long long)cs.cpu_sysinfo.cpu[CPU_IDLE];
95			cpu_now.swap+=(long long)cs.cpu_sysinfo.cpu[CPU_STATES];
96	pajs	1.1	}
97
98			cpu_now.total=cpu_now.user+cpu_now.iowait+cpu_now.kernel+cpu_now.idle+cpu_now.swap;
99	pajs	1.7
100			kstat_close(kc);
101			#endif
102	ats	1.14	#if defined(LINUX) \|\| defined(CYGWIN)
103	pajs	1.7	if ((f=fopen("/proc/stat", "r" ))==NULL) {
104			return NULL;
105			}
106			/* The very first line should be cpu */
107			if((fscanf(f, "cpu %lld %lld %lld %lld", \
108			&cpu_now.user, \
109			&cpu_now.nice, \
110			&cpu_now.kernel, \
111			&cpu_now.idle)) != 4){
112	pajs	1.8	fclose(f);
113	pajs	1.7	return NULL;
114			}
115
116			fclose(f);
117	pajs	1.1
118	pajs	1.7	cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
119	pajs	1.9	#endif
120	ats	1.13	#ifdef ALLBSD
121	pajs	1.9	#ifdef FREEBSD
122	ats	1.12	size = sizeof cp_time;
123	ats	1.11	if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) < 0){
124	pajs	1.9	return NULL;
125			}
126	ats	1.13	#else
127			mib[0] = CTL_KERN;
128			mib[1] = KERN_CP_TIME;
129			size = sizeof cp_time;
130			if (sysctl(mib, 2, &cp_time, &size, NULL, 0) < 0) {
131			return NULL;
132			}
133			#endif
134	pajs	1.9
135			cpu_now.user=cp_time[CP_USER];
136			cpu_now.nice=cp_time[CP_NICE];
137			cpu_now.kernel=cp_time[CP_SYS];
138			cpu_now.idle=cp_time[CP_IDLE];
139
140			cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
141
142	pajs	1.1	#endif
143
144			cpu_now.systime=time(NULL);
145	pajs	1.7	cpu_now_uninit=0;
146
147	pajs	1.1
148			return &cpu_now;
149			}
150
151			cpu_states_t *get_cpu_diff(){
152			static cpu_states_t cpu_diff;
153			cpu_states_t cpu_then, *cpu_tmp;
154
155			if (cpu_now_uninit){
156			if((cpu_tmp=get_cpu_totals())==NULL){
157			/* Should get_cpu_totals fail */
158			return NULL;
159			}
160			return cpu_tmp;
161			}
162
163
164			cpu_then.user=cpu_now.user;
165			cpu_then.kernel=cpu_now.kernel;
166			cpu_then.idle=cpu_now.idle;
167			cpu_then.iowait=cpu_now.iowait;
168			cpu_then.swap=cpu_now.swap;
169			cpu_then.nice=cpu_now.nice;
170			cpu_then.total=cpu_now.total;
171			cpu_then.systime=cpu_now.systime;
172
173			if((cpu_tmp=get_cpu_totals())==NULL){
174			return NULL;
175			}
176
177			cpu_diff.user = cpu_now.user - cpu_then.user;
178			cpu_diff.kernel = cpu_now.kernel - cpu_then.kernel;
179			cpu_diff.idle = cpu_now.idle - cpu_then.idle;
180			cpu_diff.iowait = cpu_now.iowait - cpu_then.iowait;
181			cpu_diff.swap = cpu_now.swap - cpu_then.swap;
182			cpu_diff.nice = cpu_now.nice - cpu_then.nice;
183			cpu_diff.total = cpu_now.total - cpu_then.total;
184			cpu_diff.systime = cpu_now.systime - cpu_then.systime;
185
186			return &cpu_diff;
187			}
188
189			cpu_percent_t *cpu_percent_usage(){
190			static cpu_percent_t cpu_usage;
191			cpu_states_t *cs_ptr;
192
193			cs_ptr=get_cpu_diff();
194			if(cs_ptr==NULL){
195			return NULL;
196			}
197
198			cpu_usage.user = ((float)cs_ptr->user / (float)cs_ptr->total)*100;
199			cpu_usage.kernel = ((float)cs_ptr->kernel / (float)cs_ptr->total)*100;
200			cpu_usage.idle = ((float)cs_ptr->idle / (float)cs_ptr->total)*100;
201			cpu_usage.iowait = ((float)cs_ptr->iowait / (float)cs_ptr->total)*100;
202			cpu_usage.swap = ((float)cs_ptr->swap / (float)cs_ptr->total)*100;
203			cpu_usage.nice = ((float)cs_ptr->nice / (float)cs_ptr->total)*100;
204			cpu_usage.time_taken = cs_ptr->systime;
205
206			return &cpu_usage;
207
208			}
209