src/libstatgrab/cpu_stats.c

/*
 * i-scream libstatgrab
 * http://www.i-scream.org
 * Copyright (C) 2000-2004 i-scream
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * $Id: cpu_stats.c,v 1.21 2004/04/06 14:52:58 tdb Exp $
 */

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

#include <time.h>
#include "statgrab.h"
#include "tools.h"
#ifdef SOLARIS
#include <kstat.h>
#include <sys/sysinfo.h>
#include <string.h>
#endif
#if defined(LINUX) || defined(CYGWIN)
#include <stdio.h>
#endif
#if defined(FREEBSD) || defined(DFBSD)
#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
#ifdef OPENBSD
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/dkstat.h>
#endif

static sg_cpu_stats cpu_now;
static int cpu_now_uninit=1;

sg_cpu_stats *sg_get_cpu_stats(){

#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        cpu_stat_t cs;
#endif
#if defined(LINUX) || defined(CYGWIN)
        FILE *f;
#endif
#ifdef ALLBSD
#if defined(NETBSD) || defined(OPENBSD)
        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) {
                sg_set_error(SG_ERROR_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) {
                sg_set_error(SG_ERROR_OPEN, "/proc/stat");
                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){
                sg_set_error(SG_ERROR_PARSE, "cpu");
                fclose(f);
                return NULL;
        }

        fclose(f);

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

sg_cpu_stats *sg_get_cpu_stats_diff(){
        static sg_cpu_stats cpu_diff;
        sg_cpu_stats cpu_then, *cpu_tmp;

        if (cpu_now_uninit){
                if((cpu_tmp=sg_get_cpu_stats())==NULL){
                        /* Should sg_get_cpu_stats 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=sg_get_cpu_stats())==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;
}

sg_cpu_percents *sg_get_cpu_percents(){
        static sg_cpu_percents cpu_usage;
        sg_cpu_stats *cs_ptr;

        cs_ptr=sg_get_cpu_stats_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:	1.23
Committed:	Wed Apr 7 14:53:40 2004 UTC (20 years, 1 month ago) by tdb
Content type:	text/plain
Branch:	MAIN
CVS Tags:	LIBSTATGRAB_0_10
Changes since 1.22:	+0 -0 lines
Log Message:	Whitespace tidyup - change spaces to tabs.
#	User	Rev	Content
1	tdb	1.16	/*
2	tdb	1.21	* i-scream libstatgrab
3	tdb	1.10	* http://www.i-scream.org
4	tdb	1.16	* Copyright (C) 2000-2004 i-scream
5	pajs	1.1	*
6	tdb	1.16	* This library is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10	pajs	1.1	*
11	tdb	1.16	* This library is distributed in the hope that it will be useful,
12	pajs	1.1	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	tdb	1.16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15	pajs	1.1	*
16	tdb	1.16	* You should have received a copy of the GNU Lesser General Public
17			* License along with this library; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19	tdb	1.17	*
20	tdb	1.22	* $Id: cpu_stats.c,v 1.21 2004/04/06 14:52:58 tdb Exp $
21	pajs	1.1	*/
22
23			#ifdef HAVE_CONFIG_H
24			#include "config.h"
25			#endif
26
27			#include <time.h>
28			#include "statgrab.h"
29	tdb	1.22	#include "tools.h"
30	pajs	1.1	#ifdef SOLARIS
31			#include <kstat.h>
32			#include <sys/sysinfo.h>
33	pajs	1.6	#include <string.h>
34	pajs	1.1	#endif
35	ats	1.14	#if defined(LINUX) \|\| defined(CYGWIN)
36	pajs	1.7	#include <stdio.h>
37			#endif
38	tdb	1.19	#if defined(FREEBSD) \|\| defined(DFBSD)
39	pajs	1.9	#include <sys/sysctl.h>
40			#include <sys/dkstat.h>
41			#endif
42	ats	1.13	#ifdef NETBSD
43			#include <sys/types.h>
44			#include <sys/param.h>
45			#include <sys/sysctl.h>
46			#include <sys/sched.h>
47			#endif
48	tdb	1.18	#ifdef OPENBSD
49			#include <sys/param.h>
50			#include <sys/sysctl.h>
51			#include <sys/dkstat.h>
52			#endif
53	pajs	1.1
54	ats	1.20	static sg_cpu_stats cpu_now;
55	pajs	1.1	static int cpu_now_uninit=1;
56
57	ats	1.20	sg_cpu_stats *sg_get_cpu_stats(){
58	pajs	1.1
59			#ifdef SOLARIS
60	tdb	1.22	kstat_ctl_t *kc;
61			kstat_t *ksp;
62	pajs	1.7	cpu_stat_t cs;
63			#endif
64	tdb	1.15	#if defined(LINUX) \|\| defined(CYGWIN)
65	pajs	1.7	FILE *f;
66			#endif
67	ats	1.13	#ifdef ALLBSD
68	tdb	1.19	#if defined(NETBSD) \|\| defined(OPENBSD)
69	ats	1.13	int mib[2];
70			#endif
71			#ifdef NETBSD
72			u_int64_t cp_time[CPUSTATES];
73			#else
74	pajs	1.9	long cp_time[CPUSTATES];
75	ats	1.13	#endif
76	pajs	1.9	size_t size;
77			#endif
78	tdb	1.22
79	pajs	1.1	cpu_now.user=0;
80	pajs	1.9	/* Not stored in linux or freebsd */
81	pajs	1.1	cpu_now.iowait=0;
82			cpu_now.kernel=0;
83			cpu_now.idle=0;
84	pajs	1.9	/* Not stored in linux or freebsd */
85	pajs	1.1	cpu_now.swap=0;
86			cpu_now.total=0;
87			/* Not stored in solaris */
88			cpu_now.nice=0;
89
90	pajs	1.7	#ifdef SOLARIS
91	tdb	1.22	if ((kc = kstat_open()) == NULL) {
92			sg_set_error(SG_ERROR_KSTAT_OPEN, NULL);
93			return NULL;
94			}
95			for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
96			if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
97			if (kstat_read(kc, ksp, &cs) == -1) {
98			continue;
99			}
100	pajs	1.5	cpu_now.user+=(long long)cs.cpu_sysinfo.cpu[CPU_USER];
101			cpu_now.iowait+=(long long)cs.cpu_sysinfo.cpu[CPU_WAIT];
102			cpu_now.kernel+=(long long)cs.cpu_sysinfo.cpu[CPU_KERNEL];
103			cpu_now.idle+=(long long)cs.cpu_sysinfo.cpu[CPU_IDLE];
104			cpu_now.swap+=(long long)cs.cpu_sysinfo.cpu[CPU_STATES];
105	pajs	1.1	}
106
107			cpu_now.total=cpu_now.user+cpu_now.iowait+cpu_now.kernel+cpu_now.idle+cpu_now.swap;
108	pajs	1.7
109	tdb	1.22	kstat_close(kc);
110	pajs	1.7	#endif
111	ats	1.14	#if defined(LINUX) \|\| defined(CYGWIN)
112	pajs	1.7	if ((f=fopen("/proc/stat", "r" ))==NULL) {
113	tdb	1.22	sg_set_error(SG_ERROR_OPEN, "/proc/stat");
114	pajs	1.7	return NULL;
115			}
116			/* The very first line should be cpu */
117			if((fscanf(f, "cpu %lld %lld %lld %lld", \
118			&cpu_now.user, \
119			&cpu_now.nice, \
120			&cpu_now.kernel, \
121			&cpu_now.idle)) != 4){
122	tdb	1.22	sg_set_error(SG_ERROR_PARSE, "cpu");
123	pajs	1.8	fclose(f);
124	pajs	1.7	return NULL;
125			}
126
127			fclose(f);
128	pajs	1.1
129	pajs	1.7	cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
130	pajs	1.9	#endif
131	ats	1.13	#ifdef ALLBSD
132	tdb	1.19	#if defined(FREEBSD) \|\| defined(DFBSD)
133	ats	1.12	size = sizeof cp_time;
134	ats	1.11	if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) < 0){
135	tdb	1.22	sg_set_error(SG_ERROR_SYSCTLBYNAME, "kern.cp_time");
136	pajs	1.9	return NULL;
137			}
138	ats	1.13	#else
139			mib[0] = CTL_KERN;
140	tdb	1.18	#ifdef NETBSD
141	ats	1.13	mib[1] = KERN_CP_TIME;
142	tdb	1.18	#else
143			mib[1] = KERN_CPTIME;
144			#endif
145	ats	1.13	size = sizeof cp_time;
146			if (sysctl(mib, 2, &cp_time, &size, NULL, 0) < 0) {
147	tdb	1.22	#ifdef NETBSD
148			sg_set_error(SG_ERROR_SYSCTL, "CTL_KERN.KERN_CP_TIME");
149			#else
150			sg_set_error(SG_ERROR_SYSCTL, "CTL_KERN.KERN_CPTIME");
151			#endif
152	ats	1.13	return NULL;
153			}
154			#endif
155	pajs	1.9
156			cpu_now.user=cp_time[CP_USER];
157			cpu_now.nice=cp_time[CP_NICE];
158			cpu_now.kernel=cp_time[CP_SYS];
159			cpu_now.idle=cp_time[CP_IDLE];
160
161			cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
162
163	pajs	1.1	#endif
164
165			cpu_now.systime=time(NULL);
166	pajs	1.7	cpu_now_uninit=0;
167
168	pajs	1.1
169			return &cpu_now;
170			}
171
172	ats	1.20	sg_cpu_stats *sg_get_cpu_stats_diff(){
173			static sg_cpu_stats cpu_diff;
174			sg_cpu_stats cpu_then, *cpu_tmp;
175	pajs	1.1
176			if (cpu_now_uninit){
177	ats	1.20	if((cpu_tmp=sg_get_cpu_stats())==NULL){
178	tdb	1.22	/* Should sg_get_cpu_stats fail */
179	pajs	1.1	return NULL;
180			}
181			return cpu_tmp;
182			}
183
184
185	tdb	1.22	cpu_then.user=cpu_now.user;
186			cpu_then.kernel=cpu_now.kernel;
187			cpu_then.idle=cpu_now.idle;
188			cpu_then.iowait=cpu_now.iowait;
189			cpu_then.swap=cpu_now.swap;
190			cpu_then.nice=cpu_now.nice;
191			cpu_then.total=cpu_now.total;
192			cpu_then.systime=cpu_now.systime;
193	pajs	1.1
194	ats	1.20	if((cpu_tmp=sg_get_cpu_stats())==NULL){
195	pajs	1.1	return NULL;
196			}
197
198			cpu_diff.user = cpu_now.user - cpu_then.user;
199			cpu_diff.kernel = cpu_now.kernel - cpu_then.kernel;
200			cpu_diff.idle = cpu_now.idle - cpu_then.idle;
201			cpu_diff.iowait = cpu_now.iowait - cpu_then.iowait;
202			cpu_diff.swap = cpu_now.swap - cpu_then.swap;
203			cpu_diff.nice = cpu_now.nice - cpu_then.nice;
204			cpu_diff.total = cpu_now.total - cpu_then.total;
205			cpu_diff.systime = cpu_now.systime - cpu_then.systime;
206
207			return &cpu_diff;
208			}
209
210	ats	1.20	sg_cpu_percents *sg_get_cpu_percents(){
211			static sg_cpu_percents cpu_usage;
212			sg_cpu_stats *cs_ptr;
213	pajs	1.1
214	ats	1.20	cs_ptr=sg_get_cpu_stats_diff();
215	pajs	1.1	if(cs_ptr==NULL){
216			return NULL;
217			}
218
219			cpu_usage.user = ((float)cs_ptr->user / (float)cs_ptr->total)*100;
220			cpu_usage.kernel = ((float)cs_ptr->kernel / (float)cs_ptr->total)*100;
221			cpu_usage.idle = ((float)cs_ptr->idle / (float)cs_ptr->total)*100;
222			cpu_usage.iowait = ((float)cs_ptr->iowait / (float)cs_ptr->total)*100;
223			cpu_usage.swap = ((float)cs_ptr->swap / (float)cs_ptr->total)*100;
224			cpu_usage.nice = ((float)cs_ptr->nice / (float)cs_ptr->total)*100;
225			cpu_usage.time_taken = cs_ptr->systime;
226
227			return &cpu_usage;
228
229			}
230