src/libstatgrab/page_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 "statgrab.h"
#include <time.h>
#ifdef SOLARIS
#include <kstat.h>
#include <sys/sysinfo.h>
#include <string.h>
#endif
#ifdef LINUX
#include <stdio.h>
#include "tools.h"
#endif
#ifdef FREEBSD
#include <sys/types.h>
#include <sys/sysctl.h>
#endif

static page_stat_t page_stats;
static int page_stats_uninit=1;

page_stat_t *get_page_stats(){
#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        cpu_stat_t cs;
#endif
#ifdef LINUX
        FILE *f;
        char *line_ptr;
#endif
#ifdef FREEBSD
        size_t size;
#endif

        page_stats.pages_pagein=0;
        page_stats.pages_pageout=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;
                }

                page_stats.pages_pagein+=(long long)cs.cpu_vminfo.pgpgin;
                page_stats.pages_pageout+=(long long)cs.cpu_vminfo.pgpgout;
        }

        page_stats.systime=time(NULL);

        kstat_close(kc);
#endif
#ifdef LINUX
        if((f=fopen("/proc/stat", "r"))==NULL){
                return NULL;
        }
        if((line_ptr=f_read_line(f, "page"))==NULL){
                fclose(f);
                return NULL;
        }
        if((sscanf(line_ptr, "page %lld %lld", &page_stats.pages_pagein, &page_stats.pages_pageout))!=2){
                return NULL;
        }
        page_stats.systime=time(NULL);
        fclose(f);

#endif
#ifdef FREEBSD
        if (sysctlbyname("vm.stats.vm.v_swappgsin", &page_stats.pages_pagein, &size, NULL, 0) < 0){
                return NULL;
        }
        if (sysctlbyname("vm.stats.vm.v_swappgsout", &page_stats.pages_pageout, &size, NULL, 0) < 0){
                return NULL;
        }

#endif

        return &page_stats;
}

page_stat_t *get_page_stats_diff(){
        page_stat_t *page_ptr;
        static page_stat_t page_stats_diff;

        if(page_stats_uninit){
                page_ptr=get_page_stats();
                if(page_ptr==NULL){
                        return NULL;
                }
                page_stats_uninit=0;
                return page_ptr;
        }

        page_stats_diff.pages_pagein=page_stats.pages_pagein;
        page_stats_diff.pages_pageout=page_stats.pages_pageout;
        page_stats_diff.systime=page_stats.systime;

        page_ptr=get_page_stats();
        if(page_ptr==NULL){
                return NULL;
        }

        page_stats_diff.pages_pagein=page_stats.pages_pagein-page_stats_diff.pages_pagein;
        page_stats_diff.pages_pageout=page_stats.pages_pageout-page_stats_diff.pages_pageout;
        page_stats_diff.systime=page_stats.systime-page_stats_diff.systime;
        
        return &page_stats_diff;
}
Revision:	1.7
Committed:	Sat Oct 18 22:15:35 2003 UTC (20 years, 7 months ago) by ats
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+2 -8 lines
Log Message:	You only need to call sysctl{,byname}() twice if you're actually going to do something with the size the first call returns. The last argument to sysctl{,byname}() is a size_t, not a pointer, so it should be 0, not NULL.
#	User	Rev	Content
1	pajs	1.1	/*
2			* i-scream central monitoring system
3	tdb	1.6	* 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	pajs	1.2	#include "statgrab.h"
26	pajs	1.4	#include <time.h>
27	pajs	1.1	#ifdef SOLARIS
28			#include <kstat.h>
29			#include <sys/sysinfo.h>
30	pajs	1.2	#include <string.h>
31	pajs	1.1	#endif
32	pajs	1.4	#ifdef LINUX
33			#include <stdio.h>
34			#include "tools.h"
35			#endif
36	pajs	1.5	#ifdef FREEBSD
37			#include <sys/types.h>
38			#include <sys/sysctl.h>
39			#endif
40	pajs	1.3
41			static page_stat_t page_stats;
42			static int page_stats_uninit=1;
43
44	pajs	1.1	page_stat_t *get_page_stats(){
45	pajs	1.4	#ifdef SOLARIS
46	pajs	1.1	kstat_ctl_t *kc;
47			kstat_t *ksp;
48			cpu_stat_t cs;
49	pajs	1.4	#endif
50			#ifdef LINUX
51			FILE *f;
52			char *line_ptr;
53			#endif
54	pajs	1.5	#ifdef FREEBSD
55			size_t size;
56			#endif
57	pajs	1.2
58			page_stats.pages_pagein=0;
59			page_stats.pages_pageout=0;
60	pajs	1.1
61	pajs	1.4	#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
71	pajs	1.2	page_stats.pages_pagein+=(long long)cs.cpu_vminfo.pgpgin;
72			page_stats.pages_pageout+=(long long)cs.cpu_vminfo.pgpgout;
73			}
74
75			page_stats.systime=time(NULL);
76
77			kstat_close(kc);
78	pajs	1.4	#endif
79			#ifdef LINUX
80			if((f=fopen("/proc/stat", "r"))==NULL){
81			return NULL;
82			}
83			if((line_ptr=f_read_line(f, "page"))==NULL){
84			fclose(f);
85			return NULL;
86			}
87			if((sscanf(line_ptr, "page %lld %lld", &page_stats.pages_pagein, &page_stats.pages_pageout))!=2){
88			return NULL;
89			}
90			page_stats.systime=time(NULL);
91			fclose(f);
92	pajs	1.5
93			#endif
94			#ifdef FREEBSD
95	ats	1.7	if (sysctlbyname("vm.stats.vm.v_swappgsin", &page_stats.pages_pagein, &size, NULL, 0) < 0){
96	pajs	1.5	return NULL;
97			}
98	ats	1.7	if (sysctlbyname("vm.stats.vm.v_swappgsout", &page_stats.pages_pageout, &size, NULL, 0) < 0){
99	pajs	1.5	return NULL;
100			}
101	pajs	1.4
102			#endif
103	pajs	1.1
104	pajs	1.2	return &page_stats;
105	pajs	1.3	}
106
107			page_stat_t *get_page_stats_diff(){
108			page_stat_t *page_ptr;
109			static page_stat_t page_stats_diff;
110
111			if(page_stats_uninit){
112			page_ptr=get_page_stats();
113			if(page_ptr==NULL){
114			return NULL;
115			}
116			page_stats_uninit=0;
117			return page_ptr;
118			}
119
120			page_stats_diff.pages_pagein=page_stats.pages_pagein;
121			page_stats_diff.pages_pageout=page_stats.pages_pageout;
122			page_stats_diff.systime=page_stats.systime;
123
124			page_ptr=get_page_stats();
125			if(page_ptr==NULL){
126			return NULL;
127			}
128
129			page_stats_diff.pages_pagein=page_stats.pages_pagein-page_stats_diff.pages_pagein;
130			page_stats_diff.pages_pageout=page_stats.pages_pageout-page_stats_diff.pages_pageout;
131			page_stats_diff.systime=page_stats.systime-page_stats_diff.systime;
132
133			return &page_stats_diff;
134	pajs	1.1	}