src/libstatgrab/cpu_stats.c

/*
 * i-scream central monitoring system
 * 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 1.19 2004/02/16 14:55:32 tdb Exp $
 */

#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
#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) {
                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
#if defined(FREEBSD) || defined(DFBSD)
        size = sizeof cp_time;
        if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) < 0){
                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) {
                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:	1.20
Committed:	Mon Apr 5 15:40:14 2004 UTC (20 years, 1 month ago) by ats
Content type:	text/plain
Branch:	MAIN
Changes since 1.19:	+13 -13 lines
Log Message:	Rename all the functions, types and enums in the API to be consistent. Types are now of the form "sg_mem_stats"; functions of the form "sg_get_mem_stats"; enums of the form "SG_PROCESS_STATE_RUNNING". (The old get_proc_snapshot follows the usual calling convention now.) Make internal functions static where possible. Rename non-static internal functions to have an sg_ prefix so they don't collide with those from other libraries. In particular, strlcpy and strlcat are now called sg_strlcpy and sg_strlcat and are always included. Fix saidar and statgrab to use the new API.
#	User	Rev	Content
1	tdb	1.16	/*
2	pajs	1.1	* i-scream central monitoring system
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	ats	1.20	* $Id: cpu_stats.c,v 1.19 2004/02/16 14:55:32 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			#ifdef SOLARIS
30			#include <kstat.h>
31			#include <sys/sysinfo.h>
32	pajs	1.6	#include <string.h>
33	pajs	1.1	#endif
34	ats	1.14	#if defined(LINUX) \|\| defined(CYGWIN)
35	pajs	1.7	#include <stdio.h>
36			#endif
37	tdb	1.19	#if defined(FREEBSD) \|\| defined(DFBSD)
38	pajs	1.9	#include <sys/sysctl.h>
39			#include <sys/dkstat.h>
40			#endif
41	ats	1.13	#ifdef NETBSD
42			#include <sys/types.h>
43			#include <sys/param.h>
44			#include <sys/sysctl.h>
45			#include <sys/sched.h>
46			#endif
47	tdb	1.18	#ifdef OPENBSD
48			#include <sys/param.h>
49			#include <sys/sysctl.h>
50			#include <sys/dkstat.h>
51			#endif
52	pajs	1.1
53	ats	1.20	static sg_cpu_stats cpu_now;
54	pajs	1.1	static int cpu_now_uninit=1;
55
56	ats	1.20	sg_cpu_stats *sg_get_cpu_stats(){
57	pajs	1.1
58			#ifdef SOLARIS
59			kstat_ctl_t *kc;
60			kstat_t *ksp;
61	pajs	1.7	cpu_stat_t cs;
62			#endif
63	tdb	1.15	#if defined(LINUX) \|\| defined(CYGWIN)
64	pajs	1.7	FILE *f;
65			#endif
66	ats	1.13	#ifdef ALLBSD
67	tdb	1.19	#if defined(NETBSD) \|\| defined(OPENBSD)
68	ats	1.13	int mib[2];
69			#endif
70			#ifdef NETBSD
71			u_int64_t cp_time[CPUSTATES];
72			#else
73	pajs	1.9	long cp_time[CPUSTATES];
74	ats	1.13	#endif
75	pajs	1.9	size_t size;
76			#endif
77	pajs	1.7
78	pajs	1.1	cpu_now.user=0;
79	pajs	1.9	/* Not stored in linux or freebsd */
80	pajs	1.1	cpu_now.iowait=0;
81			cpu_now.kernel=0;
82			cpu_now.idle=0;
83	pajs	1.9	/* Not stored in linux or freebsd */
84	pajs	1.1	cpu_now.swap=0;
85			cpu_now.total=0;
86			/* Not stored in solaris */
87			cpu_now.nice=0;
88
89	pajs	1.7	#ifdef SOLARIS
90	pajs	1.1	if ((kc = kstat_open()) == NULL) {
91			return NULL;
92			}
93			for (ksp = kc->kc_chain; ksp!=NULL; ksp = ksp->ks_next) {
94			if ((strcmp(ksp->ks_module, "cpu_stat")) != 0) continue;
95			if (kstat_read(kc, ksp, &cs) == -1) {
96			continue;
97			}
98	pajs	1.5	cpu_now.user+=(long long)cs.cpu_sysinfo.cpu[CPU_USER];
99			cpu_now.iowait+=(long long)cs.cpu_sysinfo.cpu[CPU_WAIT];
100			cpu_now.kernel+=(long long)cs.cpu_sysinfo.cpu[CPU_KERNEL];
101			cpu_now.idle+=(long long)cs.cpu_sysinfo.cpu[CPU_IDLE];
102			cpu_now.swap+=(long long)cs.cpu_sysinfo.cpu[CPU_STATES];
103	pajs	1.1	}
104
105			cpu_now.total=cpu_now.user+cpu_now.iowait+cpu_now.kernel+cpu_now.idle+cpu_now.swap;
106	pajs	1.7
107			kstat_close(kc);
108			#endif
109	ats	1.14	#if defined(LINUX) \|\| defined(CYGWIN)
110	pajs	1.7	if ((f=fopen("/proc/stat", "r" ))==NULL) {
111			return NULL;
112			}
113			/* The very first line should be cpu */
114			if((fscanf(f, "cpu %lld %lld %lld %lld", \
115			&cpu_now.user, \
116			&cpu_now.nice, \
117			&cpu_now.kernel, \
118			&cpu_now.idle)) != 4){
119	pajs	1.8	fclose(f);
120	pajs	1.7	return NULL;
121			}
122
123			fclose(f);
124	pajs	1.1
125	pajs	1.7	cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
126	pajs	1.9	#endif
127	ats	1.13	#ifdef ALLBSD
128	tdb	1.19	#if defined(FREEBSD) \|\| defined(DFBSD)
129	ats	1.12	size = sizeof cp_time;
130	ats	1.11	if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) < 0){
131	pajs	1.9	return NULL;
132			}
133	ats	1.13	#else
134			mib[0] = CTL_KERN;
135	tdb	1.18	#ifdef NETBSD
136	ats	1.13	mib[1] = KERN_CP_TIME;
137	tdb	1.18	#else
138			mib[1] = KERN_CPTIME;
139			#endif
140	ats	1.13	size = sizeof cp_time;
141			if (sysctl(mib, 2, &cp_time, &size, NULL, 0) < 0) {
142			return NULL;
143			}
144			#endif
145	pajs	1.9
146			cpu_now.user=cp_time[CP_USER];
147			cpu_now.nice=cp_time[CP_NICE];
148			cpu_now.kernel=cp_time[CP_SYS];
149			cpu_now.idle=cp_time[CP_IDLE];
150
151			cpu_now.total=cpu_now.user+cpu_now.nice+cpu_now.kernel+cpu_now.idle;
152
153	pajs	1.1	#endif
154
155			cpu_now.systime=time(NULL);
156	pajs	1.7	cpu_now_uninit=0;
157
158	pajs	1.1
159			return &cpu_now;
160			}
161
162	ats	1.20	sg_cpu_stats *sg_get_cpu_stats_diff(){
163			static sg_cpu_stats cpu_diff;
164			sg_cpu_stats cpu_then, *cpu_tmp;
165	pajs	1.1
166			if (cpu_now_uninit){
167	ats	1.20	if((cpu_tmp=sg_get_cpu_stats())==NULL){
168			/* Should sg_get_cpu_stats fail */
169	pajs	1.1	return NULL;
170			}
171			return cpu_tmp;
172			}
173
174
175			cpu_then.user=cpu_now.user;
176			cpu_then.kernel=cpu_now.kernel;
177			cpu_then.idle=cpu_now.idle;
178			cpu_then.iowait=cpu_now.iowait;
179			cpu_then.swap=cpu_now.swap;
180			cpu_then.nice=cpu_now.nice;
181			cpu_then.total=cpu_now.total;
182			cpu_then.systime=cpu_now.systime;
183
184	ats	1.20	if((cpu_tmp=sg_get_cpu_stats())==NULL){
185	pajs	1.1	return NULL;
186			}
187
188			cpu_diff.user = cpu_now.user - cpu_then.user;
189			cpu_diff.kernel = cpu_now.kernel - cpu_then.kernel;
190			cpu_diff.idle = cpu_now.idle - cpu_then.idle;
191			cpu_diff.iowait = cpu_now.iowait - cpu_then.iowait;
192			cpu_diff.swap = cpu_now.swap - cpu_then.swap;
193			cpu_diff.nice = cpu_now.nice - cpu_then.nice;
194			cpu_diff.total = cpu_now.total - cpu_then.total;
195			cpu_diff.systime = cpu_now.systime - cpu_then.systime;
196
197			return &cpu_diff;
198			}
199
200	ats	1.20	sg_cpu_percents *sg_get_cpu_percents(){
201			static sg_cpu_percents cpu_usage;
202			sg_cpu_stats *cs_ptr;
203	pajs	1.1
204	ats	1.20	cs_ptr=sg_get_cpu_stats_diff();
205	pajs	1.1	if(cs_ptr==NULL){
206			return NULL;
207			}
208
209			cpu_usage.user = ((float)cs_ptr->user / (float)cs_ptr->total)*100;
210			cpu_usage.kernel = ((float)cs_ptr->kernel / (float)cs_ptr->total)*100;
211			cpu_usage.idle = ((float)cs_ptr->idle / (float)cs_ptr->total)*100;
212			cpu_usage.iowait = ((float)cs_ptr->iowait / (float)cs_ptr->total)*100;
213			cpu_usage.swap = ((float)cs_ptr->swap / (float)cs_ptr->total)*100;
214			cpu_usage.nice = ((float)cs_ptr->nice / (float)cs_ptr->total)*100;
215			cpu_usage.time_taken = cs_ptr->systime;
216
217			return &cpu_usage;
218
219			}
220