src/libstatgrab/memory_stats.c

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 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
        long inactive;
        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 byes */
        if (sysctlbyname("hw.physmem", NULL, &size, NULL, NULL) < 0){
                return NULL;
        }
        if (sysctlbyname("hw.physmem", &mem_stat.total, &size, NULL, NULL) < 0){
                return NULL;
        }

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

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

        if (sysctlbyname("vm.stats.vm.v_cache_count", NULL, &size, NULL, NULL) < 0){
                return NULL;
        }
        if (sysctlbyname("vm.stats.vm.v_cache_count", &mem_stat.cache, &size, NULL, NULL) < 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.cache=mem_stat.cache*pagesize;
        /* Of couse nothing is ever that simple :) And i have inactive pages to deal 
         * with too. So im goingto add them to free memory :)
         */
        mem_stat.free=(mem_stat.free*pagesize)+(inactive*pagesize);
        
        mem_stat.used=mem_stat.total-mem_stat.free;

#endif

        return &mem_stat;

}
Revision:	1.6
Committed:	Thu Apr 3 20:05:10 2003 UTC (21 years, 1 month ago) by pajs
Content type:	text/plain
Branch:	MAIN
CVS Tags:	LIBSTATGRAB_0_4
Changes since 1.5:	+59 -0 lines
Log Message:	Should now work happily on freebsd. sysctlbyname seems to return a lot of things in long's. Im not completely trusting this code, but it does appear to work, and its the same as the old implementation.
#	User	Rev	Content
1	pajs	1.1	/*
2			* i-scream central monitoring system
3			* http://www.i-scream.org.uk
4			* Copyright (C) 2000-2002 i-scream
5			*
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			long inactive;
58			size_t size;
59			int pagesize;
60			#endif
61	pajs	1.1
62			#ifdef SOLARIS
63			if((pagesize=sysconf(_SC_PAGESIZE)) == -1){
64			return NULL;
65			}
66
67			if((totalmem=sysconf(_SC_PHYS_PAGES)) == -1){
68			return NULL;
69			}
70
71			if ((kc = kstat_open()) == NULL) {
72			return NULL;
73			}
74			if((ksp=kstat_lookup(kc, "unix", 0, "system_pages")) == NULL){
75			return NULL;
76			}
77			if (kstat_read(kc, ksp, 0) == -1) {
78			return NULL;
79			}
80			if((kn=kstat_data_lookup(ksp, "freemem")) == NULL){
81			return NULL;
82			}
83	pajs	1.2	kstat_close(kc);
84
85	pajs	1.1	mem_stat.total = (long long)totalmem * (long long)pagesize;
86			mem_stat.free = ((long long)kn->value.ul) * (long long)pagesize;
87			mem_stat.used = mem_stat.total - mem_stat.free;
88	pajs	1.5	#endif
89
90			#ifdef LINUX
91			f=fopen("/proc/meminfo", "r");
92			if(f==NULL){
93			return NULL;
94			}
95
96			if((line_ptr=f_read_line(f, "Mem:"))==NULL){
97			fclose(f);
98			return NULL;
99			}
100
101			fclose(f);
102
103			/* Linux actually stores this as a unsigned long long, but
104			* our structures are just long longs. This shouldn't be a
105			* problem for sometime yet :)
106			*/
107			if((sscanf(line_ptr,"Mem: %lld %lld %lld %d %d %lld", \
108			&mem_stat.total, \
109			&mem_stat.used, \
110			&mem_stat.free, \
111			&mem_stat.cache))!=4){
112			return NULL;
113			}
114	pajs	1.6
115			#endif
116
117			#ifdef FREEBSD
118			/* Returns byes */
119			if (sysctlbyname("hw.physmem", NULL, &size, NULL, NULL) < 0){
120			return NULL;
121			}
122			if (sysctlbyname("hw.physmem", &mem_stat.total, &size, NULL, NULL) < 0){
123			return NULL;
124			}
125
126			/returns pages/
127			if (sysctlbyname("vm.stats.vm.v_free_count", NULL, &size, NULL, NULL) < 0){
128			return NULL;
129			}
130			if (sysctlbyname("vm.stats.vm.v_free_count", &mem_stat.free, &size, NULL, NULL) < 0){
131			return NULL;
132			}
133
134			if (sysctlbyname("vm.stats.vm.v_inactive_count", NULL, &size, NULL, NULL) < 0){
135			return NULL;
136			}
137			if (sysctlbyname("vm.stats.vm.v_inactive_count", &inactive , &size, NULL, NULL) < 0){
138			return NULL;
139			}
140
141			if (sysctlbyname("vm.stats.vm.v_cache_count", NULL, &size, NULL, NULL) < 0){
142			return NULL;
143			}
144			if (sysctlbyname("vm.stats.vm.v_cache_count", &mem_stat.cache, &size, NULL, NULL) < 0){
145			return NULL;
146			}
147
148			/* Because all the vm.stats returns pages, i need to get the page size.
149			* After that i then need to multiple the anything that used vm.stats to get
150			* the system statistics by pagesize
151			*/
152			if ((pagesize=getpagesize()) == -1){
153			return NULL;
154			}
155
156			mem_stat.cache=mem_stat.cache*pagesize;
157			/* Of couse nothing is ever that simple :) And i have inactive pages to deal
158			* with too. So im goingto add them to free memory :)
159			*/
160			mem_stat.free=(mem_stat.freepagesize)+(inactivepagesize);
161
162			mem_stat.used=mem_stat.total-mem_stat.free;
163	pajs	1.5
164	pajs	1.1	#endif
165
166			return &mem_stat;
167
168			}