src/libstatgrab/memory_stats.c

/*
 * i-scream libstatgrab
 * 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: memory_stats.c,v 1.27 2004/04/07 21:08:40 tdb Exp $
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "statgrab.h"
#include "tools.h"
#ifdef SOLARIS
#include <unistd.h>
#include <kstat.h>
#endif
#if defined(LINUX) || defined(CYGWIN)
#include <stdio.h>
#include <string.h>
#endif
#if defined(FREEBSD) || defined(DFBSD)
#include <sys/types.h>
#include <sys/sysctl.h>
#include <unistd.h>
#endif
#if defined(NETBSD) || defined(OPENBSD)
#include <sys/param.h>
#include <sys/time.h>
#include <uvm/uvm.h>
#endif

sg_mem_stats *sg_get_mem_stats(){

        static sg_mem_stats mem_stat;

#ifdef SOLARIS
        kstat_ctl_t *kc;
        kstat_t *ksp;
        kstat_named_t *kn;
        long totalmem;
        int pagesize;
#endif
#if defined(LINUX) || defined(CYGWIN)
        char *line_ptr;
        unsigned long long value;
        FILE *f;
#endif
#if defined(FREEBSD) || defined(DFBSD)
        int mib[2];
        u_long physmem;
        size_t size;
        u_int free_count;
        u_int cache_count;
        u_int inactive_count;
        int pagesize;
#endif
#if defined(NETBSD) || defined(OPENBSD)
        struct uvmexp *uvm;
#endif

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

        if((totalmem=sysconf(_SC_PHYS_PAGES)) == -1){
                sg_set_error_with_errno(SG_ERROR_SYSCONF, "_SC_PHYS_PAGES");
                return NULL;
        }

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

#if defined(LINUX) || defined(CYGWIN)
        if ((f = fopen("/proc/meminfo", "r")) == NULL) {
                sg_set_error_with_errno(SG_ERROR_OPEN, "/proc/meminfo");
                return NULL;
        }

        while ((line_ptr = sg_f_read_line(f, "")) != NULL) {
                if (sscanf(line_ptr, "%*s %llu kB", &value) != 1) {
                        continue;
                }
                value *= 1024;

                if (strncmp(line_ptr, "MemTotal:", 9) == 0) {
                        mem_stat.total = value;
                } else if (strncmp(line_ptr, "MemFree:", 8) == 0) {
                        mem_stat.free = value;
                } else if (strncmp(line_ptr, "Cached:", 7) == 0) {
                        mem_stat.cache = value;
                }
        }

        fclose(f);
        mem_stat.used = mem_stat.total - mem_stat.free;
#endif

#if defined(FREEBSD) || defined(DFBSD)
        /* Returns bytes */
        mib[0] = CTL_HW;
        mib[1] = HW_PHYSMEM;
        size = sizeof physmem;
        if (sysctl(mib, 2, &physmem, &size, NULL, 0) < 0) {
                sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_PHYSMEM");
                return NULL;
        }
        mem_stat.total = physmem;

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

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

        size = sizeof cache_count;
        if (sysctlbyname("vm.stats.vm.v_cache_count", &cache_count, &size, NULL, 0) < 0){
                sg_set_error_with_errno(SG_ERROR_SYSCTLBYNAME,
                                        "vm.stats.vm.v_cache_count");
                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 
         */
        /* FIXME getpagesize() cannot actually fail */
        if ((pagesize=getpagesize()) == -1){
                sg_set_error(SG_ERROR_GETPAGESIZE, "NULL");
                return NULL;
        }

        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

#if defined(NETBSD) || defined(OPENBSD)
        if ((uvm = sg_get_uvmexp()) == NULL) {
                return NULL;
        }

        mem_stat.total = uvm->pagesize * uvm->npages;
#ifdef NETBSD
        mem_stat.cache = uvm->pagesize * (uvm->filepages + uvm->execpages);
#else
        /* Can't find cache memory on OpenBSD */
        mem_stat.cache = 0;
#endif
        mem_stat.free = uvm->pagesize * (uvm->free + uvm->inactive);
        mem_stat.used = mem_stat.total - mem_stat.free;
#endif

        return &mem_stat;
}
Revision:	1.28
Committed:	Sun Jul 18 21:30:11 2004 UTC (19 years, 10 months ago) by ats
Content type:	text/plain
Branch:	MAIN
Changes since 1.27:	+12 -8 lines
Log Message:	Use sg_set_error_with_errno whenever errno's valid. Change the one user of SG_ERROR_ENOENT to SG_ERROR_SYSCTL instead (since that's what it should have been).
#	Content
1	/*
2	* i-scream libstatgrab
3	* http://www.i-scream.org
4	* Copyright (C) 2000-2004 i-scream
5	*
6	* 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	*
11	* This library 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 GNU
14	* Lesser General Public License for more details.
15	*
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
19	* 02111-1307 USA
20	*
21	* $Id: memory_stats.c,v 1.27 2004/04/07 21:08:40 tdb Exp $
22	*/
23
24	#ifdef HAVE_CONFIG_H
25	#include "config.h"
26	#endif
27
28	#include "statgrab.h"
29	#include "tools.h"
30	#ifdef SOLARIS
31	#include <unistd.h>
32	#include <kstat.h>
33	#endif
34	#if defined(LINUX) \|\| defined(CYGWIN)
35	#include <stdio.h>
36	#include <string.h>
37	#endif
38	#if defined(FREEBSD) \|\| defined(DFBSD)
39	#include <sys/types.h>
40	#include <sys/sysctl.h>
41	#include <unistd.h>
42	#endif
43	#if defined(NETBSD) \|\| defined(OPENBSD)
44	#include <sys/param.h>
45	#include <sys/time.h>
46	#include <uvm/uvm.h>
47	#endif
48
49	sg_mem_stats *sg_get_mem_stats(){
50
51	static sg_mem_stats mem_stat;
52
53	#ifdef SOLARIS
54	kstat_ctl_t *kc;
55	kstat_t *ksp;
56	kstat_named_t *kn;
57	long totalmem;
58	int pagesize;
59	#endif
60	#if defined(LINUX) \|\| defined(CYGWIN)
61	char *line_ptr;
62	unsigned long long value;
63	FILE *f;
64	#endif
65	#if defined(FREEBSD) \|\| defined(DFBSD)
66	int mib[2];
67	u_long physmem;
68	size_t size;
69	u_int free_count;
70	u_int cache_count;
71	u_int inactive_count;
72	int pagesize;
73	#endif
74	#if defined(NETBSD) \|\| defined(OPENBSD)
75	struct uvmexp *uvm;
76	#endif
77
78	#ifdef SOLARIS
79	if((pagesize=sysconf(_SC_PAGESIZE)) == -1){
80	sg_set_error_with_errno(SG_ERROR_SYSCONF, "_SC_PAGESIZE");
81	return NULL;
82	}
83
84	if((totalmem=sysconf(_SC_PHYS_PAGES)) == -1){
85	sg_set_error_with_errno(SG_ERROR_SYSCONF, "_SC_PHYS_PAGES");
86	return NULL;
87	}
88
89	if ((kc = kstat_open()) == NULL) {
90	sg_set_error(SG_ERROR_KSTAT_OPEN, NULL);
91	return NULL;
92	}
93	if((ksp=kstat_lookup(kc, "unix", 0, "system_pages")) == NULL){
94	sg_set_error(SG_ERROR_KSTAT_LOOKUP, "unix,0,system_pages");
95	return NULL;
96	}
97	if (kstat_read(kc, ksp, 0) == -1) {
98	sg_set_error(SG_ERROR_KSTAT_READ, NULL);
99	return NULL;
100	}
101	if((kn=kstat_data_lookup(ksp, "freemem")) == NULL){
102	sg_set_error(SG_ERROR_KSTAT_DATA_LOOKUP, "freemem");
103	return NULL;
104	}
105	kstat_close(kc);
106
107	mem_stat.total = (long long)totalmem * (long long)pagesize;
108	mem_stat.free = ((long long)kn->value.ul) * (long long)pagesize;
109	mem_stat.used = mem_stat.total - mem_stat.free;
110	#endif
111
112	#if defined(LINUX) \|\| defined(CYGWIN)
113	if ((f = fopen("/proc/meminfo", "r")) == NULL) {
114	sg_set_error_with_errno(SG_ERROR_OPEN, "/proc/meminfo");
115	return NULL;
116	}
117
118	while ((line_ptr = sg_f_read_line(f, "")) != NULL) {
119	if (sscanf(line_ptr, "%*s %llu kB", &value) != 1) {
120	continue;
121	}
122	value *= 1024;
123
124	if (strncmp(line_ptr, "MemTotal:", 9) == 0) {
125	mem_stat.total = value;
126	} else if (strncmp(line_ptr, "MemFree:", 8) == 0) {
127	mem_stat.free = value;
128	} else if (strncmp(line_ptr, "Cached:", 7) == 0) {
129	mem_stat.cache = value;
130	}
131	}
132
133	fclose(f);
134	mem_stat.used = mem_stat.total - mem_stat.free;
135	#endif
136
137	#if defined(FREEBSD) \|\| defined(DFBSD)
138	/* Returns bytes */
139	mib[0] = CTL_HW;
140	mib[1] = HW_PHYSMEM;
141	size = sizeof physmem;
142	if (sysctl(mib, 2, &physmem, &size, NULL, 0) < 0) {
143	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_PHYSMEM");
144	return NULL;
145	}
146	mem_stat.total = physmem;
147
148	/returns pages/
149	size = sizeof free_count;
150	if (sysctlbyname("vm.stats.vm.v_free_count", &free_count, &size, NULL, 0) < 0){
151	sg_set_error_with_errno(SG_ERROR_SYSCTLBYNAME,
152	"vm.stats.vm.v_free_count");
153	return NULL;
154	}
155
156	size = sizeof inactive_count;
157	if (sysctlbyname("vm.stats.vm.v_inactive_count", &inactive_count , &size, NULL, 0) < 0){
158	sg_set_error_with_errno(SG_ERROR_SYSCTLBYNAME,
159	"vm.stats.vm.v_inactive_count");
160	return NULL;
161	}
162
163	size = sizeof cache_count;
164	if (sysctlbyname("vm.stats.vm.v_cache_count", &cache_count, &size, NULL, 0) < 0){
165	sg_set_error_with_errno(SG_ERROR_SYSCTLBYNAME,
166	"vm.stats.vm.v_cache_count");
167	return NULL;
168	}
169
170	/* Because all the vm.stats returns pages, I need to get the page size.
171	* After that I then need to multiple the anything that used vm.stats to
172	* get the system statistics by pagesize
173	*/
174	/* FIXME getpagesize() cannot actually fail */
175	if ((pagesize=getpagesize()) == -1){
176	sg_set_error(SG_ERROR_GETPAGESIZE, "NULL");
177	return NULL;
178	}
179
180	mem_stat.cache=cache_count*pagesize;
181
182	/* Of couse nothing is ever that simple :) And I have inactive pages to
183	* deal with too. So I'm going to add them to free memory :)
184	*/
185	mem_stat.free=(free_countpagesize)+(inactive_countpagesize);
186	mem_stat.used=physmem-mem_stat.free;
187	#endif
188
189	#if defined(NETBSD) \|\| defined(OPENBSD)
190	if ((uvm = sg_get_uvmexp()) == NULL) {
191	return NULL;
192	}
193
194	mem_stat.total = uvm->pagesize * uvm->npages;
195	#ifdef NETBSD
196	mem_stat.cache = uvm->pagesize * (uvm->filepages + uvm->execpages);
197	#else
198	/* Can't find cache memory on OpenBSD */
199	mem_stat.cache = 0;
200	#endif
201	mem_stat.free = uvm->pagesize * (uvm->free + uvm->inactive);
202	mem_stat.used = mem_stat.total - mem_stat.free;
203	#endif
204
205	return &mem_stat;
206	}