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root/i-scream/projects/libstatgrab/src/libstatgrab/memory_stats.c
Revision: 1.10
Committed: Sat Oct 18 22:15:35 2003 UTC (20 years, 7 months ago) by ats
Content type: text/plain
Branch: MAIN
Changes since 1.9: +4 -16 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.

File Contents

# 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 1.10 if (sysctlbyname("hw.physmem", &physmem, &size, NULL, 0) < 0){
123 pajs 1.6 return NULL;
124     }
125    
126     /*returns pages*/
127 ats 1.10 if (sysctlbyname("vm.stats.vm.v_free_count", &free_count, &size, NULL, 0) < 0){
128 pajs 1.6 return NULL;
129     }
130    
131 ats 1.10 if (sysctlbyname("vm.stats.vm.v_inactive_count", &inactive_count , &size, NULL, 0) < 0){
132 pajs 1.6 return NULL;
133     }
134    
135 ats 1.10 if (sysctlbyname("vm.stats.vm.v_cache_count", &cache_count, &size, NULL, 0) < 0){
136 pajs 1.6 return NULL;
137     }
138    
139 tdb 1.8 /* Because all the vm.stats returns pages, I need to get the page size.
140     * After that I then need to multiple the anything that used vm.stats to
141     * get the system statistics by pagesize
142 pajs 1.6 */
143     if ((pagesize=getpagesize()) == -1){
144     return NULL;
145     }
146    
147 tdb 1.8 mem_stat.total=physmem;
148     mem_stat.cache=cache_count*pagesize;
149    
150     /* Of couse nothing is ever that simple :) And I have inactive pages to
151     * deal with too. So I'm going to add them to free memory :)
152 pajs 1.6 */
153 tdb 1.8 mem_stat.free=(free_count*pagesize)+(inactive_count*pagesize);
154     mem_stat.used=physmem-mem_stat.free;
155 pajs 1.1 #endif
156    
157     return &mem_stat;
158    
159     }