src/libstatgrab/memory_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"
#ifdef SOLARIS
#include <unistd.h>
#include <kstat.h>
#endif
#ifdef LINUX
#include <stdio.h>
#include <string.h>
#include "tools.h"
#endif
#ifdef FREEBSD
#include <sys/types.h>
#include <sys/sysctl.h>
#include <unistd.h>
#endif

mem_stat_t *get_memory_stats(){

        static mem_stat_t mem_stat;

#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        kstat_named_t *kn;
        long totalmem;
        int pagesize;
#endif
#ifdef LINUX
        char *line_ptr;
        FILE *f;
#endif
#ifdef FREEBSD
        u_int free_count;
        u_int cache_count;
        u_int inactive_count;
        u_long physmem;
        size_t size;
        int pagesize;
#endif

#ifdef SOLARIS
        if((pagesize=sysconf(_SC_PAGESIZE)) == -1){
                return NULL;    
        }

        if((totalmem=sysconf(_SC_PHYS_PAGES)) == -1){
                return NULL;
        }

        if ((kc = kstat_open()) == NULL) {
                return NULL;
        }
        if((ksp=kstat_lookup(kc, "unix", 0, "system_pages")) == NULL){
                return NULL;
        }
        if (kstat_read(kc, ksp, 0) == -1) {
                return NULL;
        }
        if((kn=kstat_data_lookup(ksp, "freemem")) == NULL){
                return NULL;
        }
        kstat_close(kc);

        mem_stat.total = (long long)totalmem * (long long)pagesize;
        mem_stat.free = ((long long)kn->value.ul) * (long long)pagesize;
        mem_stat.used = mem_stat.total - mem_stat.free;
#endif

#ifdef LINUX
        f=fopen("/proc/meminfo", "r");
        if(f==NULL){
                return NULL;
        }

        if((line_ptr=f_read_line(f, "Mem:"))==NULL){
                fclose(f);
                return NULL;
        }

        fclose(f);

        /* Linux actually stores this as a unsigned long long, but
         * our structures are just long longs. This shouldn't be a
         * problem for sometime yet :) 
         */
        if((sscanf(line_ptr,"Mem:  %lld %lld %lld %*d %*d %lld", \
                &mem_stat.total, \
                &mem_stat.used, \
                &mem_stat.free, \
                &mem_stat.cache))!=4){
                        return NULL;
        }

#endif

#ifdef FREEBSD
        /* Returns bytes */
        size = sizeof physmem;
        if (sysctlbyname("hw.physmem", &physmem, &size, NULL, 0) < 0){
                return NULL;
        }

        /*returns pages*/
        size = sizeof free_count;
        if (sysctlbyname("vm.stats.vm.v_free_count", &free_count, &size, NULL, 0) < 0){
                return NULL;
        }

        size = sizeof inactive_count;
        if (sysctlbyname("vm.stats.vm.v_inactive_count", &inactive_count , &size, NULL, 0) < 0){
                return NULL;
        }

        size = sizeof cache_count;
        if (sysctlbyname("vm.stats.vm.v_cache_count", &cache_count, &size, NULL, 0) < 0){
                return NULL;
        }

        /* Because all the vm.stats returns pages, I need to get the page size.
         * After that I then need to multiple the anything that used vm.stats to
         * get the system statistics by pagesize 
         */
        if ((pagesize=getpagesize()) == -1){
                return NULL;
        }

        mem_stat.total=physmem;
        mem_stat.cache=cache_count*pagesize;

        /* Of couse nothing is ever that simple :) And I have inactive pages to
         * deal with too. So I'm going to add them to free memory :)
         */
        mem_stat.free=(free_count*pagesize)+(inactive_count*pagesize);
        mem_stat.used=physmem-mem_stat.free;
#endif

        return &mem_stat;

}
Revision:	1.11
Committed:	Sat Oct 18 23:04:23 2003 UTC (20 years, 7 months ago) by ats
Content type:	text/plain
Branch:	MAIN
Changes since 1.10:	+4 -0 lines
Log Message:	... and the size parameter should be initialised to the size of the buffer first (although FreeBSD doesn't actually seem to care, NetBSD does, and the manual page says so).
#	User	Rev	Content
1	pajs	1.1	/*
2			* i-scream central monitoring system
3	tdb	1.7	* 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 "statgrab.h"
26			#ifdef SOLARIS
27			#include <unistd.h>
28			#include <kstat.h>
29			#endif
30	pajs	1.5	#ifdef LINUX
31			#include <stdio.h>
32			#include <string.h>
33			#include "tools.h"
34			#endif
35	pajs	1.6	#ifdef FREEBSD
36			#include <sys/types.h>
37			#include <sys/sysctl.h>
38			#include <unistd.h>
39			#endif
40	pajs	1.1
41			mem_stat_t *get_memory_stats(){
42
43			static mem_stat_t mem_stat;
44
45			#ifdef SOLARIS
46			kstat_ctl_t *kc;
47			kstat_t *ksp;
48			kstat_named_t *kn;
49			long totalmem;
50			int pagesize;
51			#endif
52	pajs	1.5	#ifdef LINUX
53			char *line_ptr;
54			FILE *f;
55			#endif
56	pajs	1.6	#ifdef FREEBSD
57	tdb	1.8	u_int free_count;
58			u_int cache_count;
59			u_int inactive_count;
60	tdb	1.9	u_long physmem;
61	pajs	1.6	size_t size;
62			int pagesize;
63			#endif
64	pajs	1.1
65			#ifdef SOLARIS
66			if((pagesize=sysconf(_SC_PAGESIZE)) == -1){
67			return NULL;
68			}
69
70			if((totalmem=sysconf(_SC_PHYS_PAGES)) == -1){
71			return NULL;
72			}
73
74			if ((kc = kstat_open()) == NULL) {
75			return NULL;
76			}
77			if((ksp=kstat_lookup(kc, "unix", 0, "system_pages")) == NULL){
78			return NULL;
79			}
80			if (kstat_read(kc, ksp, 0) == -1) {
81			return NULL;
82			}
83			if((kn=kstat_data_lookup(ksp, "freemem")) == NULL){
84			return NULL;
85			}
86	pajs	1.2	kstat_close(kc);
87
88	pajs	1.1	mem_stat.total = (long long)totalmem * (long long)pagesize;
89			mem_stat.free = ((long long)kn->value.ul) * (long long)pagesize;
90			mem_stat.used = mem_stat.total - mem_stat.free;
91	pajs	1.5	#endif
92
93			#ifdef LINUX
94			f=fopen("/proc/meminfo", "r");
95			if(f==NULL){
96			return NULL;
97			}
98
99			if((line_ptr=f_read_line(f, "Mem:"))==NULL){
100			fclose(f);
101			return NULL;
102			}
103
104			fclose(f);
105
106			/* Linux actually stores this as a unsigned long long, but
107			* our structures are just long longs. This shouldn't be a
108			* problem for sometime yet :)
109			*/
110			if((sscanf(line_ptr,"Mem: %lld %lld %lld %d %d %lld", \
111			&mem_stat.total, \
112			&mem_stat.used, \
113			&mem_stat.free, \
114			&mem_stat.cache))!=4){
115			return NULL;
116			}
117	pajs	1.6
118			#endif
119
120			#ifdef FREEBSD
121	tdb	1.8	/* Returns bytes */
122	ats	1.11	size = sizeof physmem;
123	ats	1.10	if (sysctlbyname("hw.physmem", &physmem, &size, NULL, 0) < 0){
124	pajs	1.6	return NULL;
125			}
126
127			/returns pages/
128	ats	1.11	size = sizeof free_count;
129	ats	1.10	if (sysctlbyname("vm.stats.vm.v_free_count", &free_count, &size, NULL, 0) < 0){
130	pajs	1.6	return NULL;
131			}
132
133	ats	1.11	size = sizeof inactive_count;
134	ats	1.10	if (sysctlbyname("vm.stats.vm.v_inactive_count", &inactive_count , &size, NULL, 0) < 0){
135	pajs	1.6	return NULL;
136			}
137
138	ats	1.11	size = sizeof cache_count;
139	ats	1.10	if (sysctlbyname("vm.stats.vm.v_cache_count", &cache_count, &size, NULL, 0) < 0){
140	pajs	1.6	return NULL;
141			}
142
143	tdb	1.8	/* Because all the vm.stats returns pages, I need to get the page size.
144			* After that I then need to multiple the anything that used vm.stats to
145			* get the system statistics by pagesize
146	pajs	1.6	*/
147			if ((pagesize=getpagesize()) == -1){
148			return NULL;
149			}
150
151	tdb	1.8	mem_stat.total=physmem;
152			mem_stat.cache=cache_count*pagesize;
153
154			/* Of couse nothing is ever that simple :) And I have inactive pages to
155			* deal with too. So I'm going to add them to free memory :)
156	pajs	1.6	*/
157	tdb	1.8	mem_stat.free=(free_countpagesize)+(inactive_countpagesize);
158			mem_stat.used=physmem-mem_stat.free;
159	pajs	1.1	#endif
160
161			return &mem_stat;
162
163			}