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root/i-scream/projects/libstatgrab/src/libstatgrab/disk_stats.c

Comparing projects/libstatgrab/src/libstatgrab/disk_stats.c (file contents):
Revision 1.1 by pajs, Tue Feb 18 19:28:30 2003 UTC vs.
Revision 1.65 by tdb, Wed Apr 7 14:53:40 2004 UTC

#	Line 1 | Line 1
1	<	/*
2	<	* i-scream central monitoring system
3	<	* http://www.i-scream.org.uk
4	<	* Copyright (C) 2000-2002 i-scream
1	>	/*
2	>	* i-scream libstatgrab
3	>	* http://www.i-scream.org
4	>	* Copyright (C) 2000-2004 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.
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 program is distributed in the hope that it will be useful,
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
14	<	* GNU General Public License for more details.
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 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.
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	>	* $Id$
22		*/
23
24		#ifdef HAVE_CONFIG_H
25		#include "config.h"
26		#endif
27
25	–	#include "statgrab.h"
26	–	#include <stdlib.h>
28		#include <stdio.h>
29	<	#include "ukcprog.h"
29	>	#include <stdlib.h>
30		#include <string.h>
31	+	#include <time.h>
32	+	#include "statgrab.h"
33	+	#include "vector.h"
34	+	#include "tools.h"
35
36		#ifdef SOLARIS
37		#include <sys/mnttab.h>
33	–	#include <sys/types.h>
38		#include <sys/statvfs.h>
39	<
39	>	#include <kstat.h>
40		#define VALID_FS_TYPES {"ufs", "tmpfs"}
41	+	#endif
42
43	+	#if defined(LINUX) || defined(CYGWIN)
44	+	#include <mntent.h>
45	+	#include <sys/vfs.h>
46		#endif
47
48	<	#define START_VAL 1
48	>	#ifdef LINUX
49	>	#define VALID_FS_TYPES {"adfs", "affs", "befs", "bfs", "efs", "ext2", \
50	>	"ext3", "vxfs", "hfs", "hfsplus", "hpfs", "jffs", \
51	>	"jffs2", "minix", "msdos", "ntfs", "qnx4", "ramfs", \
52	>	"rootfs", "reiserfs", "sysv", "v7", "udf", "ufs", \
53	>	"umsdos", "vfat", "xfs", "jfs"}
54	>	#endif
55
56	<	char *copy_string(char *orig_ptr, const char *newtext){
56	>	#ifdef CYGWIN
57	>	#define VALID_FS_TYPES {"user"}
58	>	#endif
59
60	<	/* Maybe free if not NULL, and strdup rather than realloc and strcpy? */
61	<	orig_ptr=realloc(orig_ptr, (1+strlen(newtext)));
62	<	if(orig_ptr==NULL){
63	<	return NULL;
64	<	}
65	<	strcpy(orig_ptr, newtext);
60	>	#ifdef ALLBSD
61	>	#include <sys/param.h>
62	>	#include <sys/ucred.h>
63	>	#include <sys/mount.h>
64	>	#endif
65	>	#if defined(FREEBSD) || defined(DFBSD)
66	>	#include <sys/dkstat.h>
67	>	#include <devstat.h>
68	>	#define VALID_FS_TYPES {"hpfs", "msdosfs", "ntfs", "udf", "ext2fs", \
69	>	"ufs", "mfs"}
70	>	#endif
71	>	#if defined(NETBSD) || defined(OPENBSD)
72	>	#include <sys/param.h>
73	>	#include <sys/sysctl.h>
74	>	#include <sys/disk.h>
75	>	#define VALID_FS_TYPES {"ffs", "mfs", "msdos", "lfs", "adosfs", "ext2fs", \
76	>	"ntfs"}
77	>	#endif
78
79	<	return orig_ptr;
79	>	static void disk_stat_init(sg_fs_stats *d) {
80	>	d->device_name = NULL;
81	>	d->fs_type = NULL;
82	>	d->mnt_point = NULL;
83		}
84
85	+	static void disk_stat_destroy(sg_fs_stats *d) {
86	+	free(d->device_name);
87	+	free(d->fs_type);
88	+	free(d->mnt_point);
89	+	}
90
91	<	void init_disk_stat(int start, int end, disk_stat_t *disk_stats){
91	>	static int is_valid_fs_type(const char *type) {
92	>	const char *types[] = VALID_FS_TYPES;
93	>	int i;
94
95	<	for(disk_stats+=start; start<=end; start++){
96	<	disk_stats->device_name=NULL;
97	<	disk_stats->fs_type=NULL;
98	<	disk_stats->mnt_point=NULL;
61	<
62	<	disk_stats++;
95	>	for (i = 0; i < (sizeof types / sizeof *types); i++) {
96	>	if (strcmp(types[i], type) == 0) {
97	>	return 1;
98	>	}
99		}
100	<
100	>	return 0;
101		}
102
103	<	disk_stat_t *get_disk_stats(int *entries){
103	>	sg_fs_stats *sg_get_fs_stats(int *entries){
104	>	VECTOR_DECLARE_STATIC(disk_stats, sg_fs_stats, 10,
105	>	disk_stat_init, disk_stat_destroy);
106
107	<	static disk_stat_t *disk_stats;
108	<	static int watermark=-1;
107	>	int valid_type;
108	>	int num_disks=0;
109	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
110	>	FILE *f;
111	>	#endif
112
113	<	char *fs_types[] = VALID_FS_TYPES;
73	<	int x, valid_type;
113	>	sg_fs_stats *disk_ptr;
114
115	<	int num_disks=0;
115	>	#ifdef SOLARIS
116		struct mnttab mp;
117		struct statvfs fs;
118	<	FILE *f;
118	>	#endif
119	>	#if defined(LINUX) || defined(CYGWIN)
120	>	struct mntent *mp;
121	>	struct statfs fs;
122	>	#endif
123	>	#ifdef ALLBSD
124	>	int nummnt;
125	>	struct statfs *mp;
126	>	#endif
127
128	<	disk_stat_t *disk_ptr;
128	>	#ifdef ALLBSD
129	>	nummnt=getmntinfo(&mp , MNT_LOCAL);
130	>	if (nummnt<=0){
131	>	return NULL;
132	>	}
133	>	for(;nummnt--; mp++){
134	>	valid_type = is_valid_fs_type(mp->f_fstypename);
135	>	#endif
136
137	<	if(watermark==-1){
138	<	disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
139	<	if(disk_stats==NULL){
85	<	return NULL;
86	<	}
87	<	watermark=START_VAL;
88	<	init_disk_stat(0, watermark-1, disk_stats);
137	>	#if defined(LINUX) || defined(CYGWIN)
138	>	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
139	>	return NULL;
140		}
141
142	+	while((mp=getmntent(f))){
143	+	if((statfs(mp->mnt_dir, &fs)) !=0){
144	+	continue;
145	+	}
146
147	+	valid_type = is_valid_fs_type(mp->mnt_type);
148	+	#endif
149	+
150	+	#ifdef SOLARIS
151		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
152		return NULL;
153		}
#	Line 96 | Line 155 | disk_stat_t *get_disk_stats(int *entries){
155		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
156		continue;
157		}
158	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
159	+	#endif
160
161	<	valid_type=0;
162	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
163	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
103	<	valid_type=1;
104	<	break;
161	>	if(valid_type){
162	>	if (VECTOR_RESIZE(disk_stats, num_disks + 1) < 0) {
163	>	return NULL;
164		}
165	<	}
165	>	disk_ptr=disk_stats+num_disks;
166
167	<	if(valid_type){
168	<	if(num_disks>watermark-1){
169	<	disk_ptr=disk_stats;
170	<	if((disk_stats=realloc(disk_stats, (watermark*2 * sizeof(disk_stat_t))))==NULL){
171	<	disk_stats=disk_ptr;
172	<	return NULL;
173	<	}
167	>	#ifdef ALLBSD
168	>	if (sg_update_string(&disk_ptr->device_name, mp->f_mntfromname) < 0) {
169	>	return NULL;
170	>	}
171	>	if (sg_update_string(&disk_ptr->fs_type, mp->f_fstypename) < 0) {
172	>	return NULL;
173	>	}
174	>	if (sg_update_string(&disk_ptr->mnt_point, mp->f_mntonname) < 0) {
175	>	return NULL;
176	>	}
177
178	<	watermark=watermark*2;
179	<	init_disk_stat(num_disks, watermark-1, disk_stats);
178	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
179	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
180	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
181	>
182	>	disk_ptr->total_inodes=(long long)mp->f_files;
183	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
184	>	/* Freebsd doesn't have a "available" inodes */
185	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
186	>	#endif
187	>	#if defined(LINUX) || defined(CYGWIN)
188	>	if (sg_update_string(&disk_ptr->device_name, mp->mnt_fsname) < 0) {
189	>	return NULL;
190		}
191	+
192	+	if (sg_update_string(&disk_ptr->fs_type, mp->mnt_type) < 0) {
193	+	return NULL;
194	+	}
195
196	<	disk_ptr=disk_stats+num_disks;
197	<
198	<	/* Memory leak in event of realloc failing */
196	>	if (sg_update_string(&disk_ptr->mnt_point, mp->mnt_dir) < 0) {
197	>	return NULL;
198	>	}
199	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
200	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
201	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
202	>
203	>	disk_ptr->total_inodes=(long long)fs.f_files;
204	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
205	>	/* Linux doesn't have a "available" inodes */
206	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
207	>	#endif
208	>
209	>	#ifdef SOLARIS
210		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
211	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
212	<	of a k each */
213	<	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
211	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
212	>	* be upwards of a k each
213	>	*/
214	>	if (sg_update_string(&disk_ptr->device_name, mp.mnt_special) < 0) {
215		return NULL;
216		}
217
218	<	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp.mnt_fstype))==NULL){
219	<	return NULL;
220	<	}
218	>	if (sg_update_string(&disk_ptr->fs_type, mp.mnt_fstype) < 0) {
219	>	return NULL;
220	>	}
221
222	<	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp.mnt_mountp))==NULL){
223	<	return NULL;
224	<	}
222	>	if (sg_update_string(&disk_ptr->mnt_point, mp.mnt_mountp) < 0) {
223	>	return NULL;
224	>	}
225
226		disk_ptr->size = (long long)fs.f_frsize * (long long)fs.f_blocks;
227		disk_ptr->avail = (long long)fs.f_frsize * (long long)fs.f_bavail;
#	Line 142 | Line 230 | disk_stat_t *get_disk_stats(int *entries){
230		disk_ptr->total_inodes=(long long)fs.f_files;
231		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
232		disk_ptr->free_inodes=(long long)fs.f_favail;
233	<
233	>	#endif
234		num_disks++;
235		}
236		}
237
238		*entries=num_disks;
239
240	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
240	>	/* If this fails, there is very little i can do about it, so
241	>	I'll ignore it :) */
242	>	#if defined(LINUX) || defined(CYGWIN)
243	>	endmntent(f);
244	>	#endif
245	>	#if defined(SOLARIS)
246		fclose(f);
247	+	#endif
248
249		return disk_stats;
250
251		}
252	+
253	+	static void diskio_stat_init(sg_disk_io_stats *d) {
254	+	d->disk_name = NULL;
255	+	}
256	+
257	+	static void diskio_stat_destroy(sg_disk_io_stats *d) {
258	+	free(d->disk_name);
259	+	}
260	+
261	+	VECTOR_DECLARE_STATIC(diskio_stats, sg_disk_io_stats, 10,
262	+	diskio_stat_init, diskio_stat_destroy);
263	+
264	+	#ifdef LINUX
265	+	typedef struct {
266	+	int major;
267	+	int minor;
268	+	} partition;
269	+	#endif
270	+
271	+	sg_disk_io_stats *sg_get_disk_io_stats(int *entries){
272	+	int num_diskio;
273	+	#ifndef LINUX
274	+	sg_disk_io_stats *diskio_stats_ptr;
275	+	#endif
276	+
277	+	#ifdef SOLARIS
278	+	kstat_ctl_t *kc;
279	+	kstat_t *ksp;
280	+	kstat_io_t kios;
281	+	#endif
282	+	#ifdef LINUX
283	+	FILE *f;
284	+	char *line_ptr;
285	+	int major, minor;
286	+	int has_pp_stats = 1;
287	+	VECTOR_DECLARE_STATIC(parts, partition, 16, NULL, NULL);
288	+	int i, n;
289	+	time_t now;
290	+	const char *format;
291	+	#endif
292	+	#if defined(FREEBSD) || defined(DFBSD)
293	+	static struct statinfo stats;
294	+	static int stats_init = 0;
295	+	int counter;
296	+	struct device_selection *dev_sel = NULL;
297	+	int n_selected, n_selections;
298	+	long sel_gen;
299	+	struct devstat *dev_ptr;
300	+	#endif
301	+	#ifdef NETBSD
302	+	struct disk_sysctl *stats;
303	+	#endif
304	+	#ifdef OPENBSD
305	+	int diskcount;
306	+	char *disknames, *name, *bufpp;
307	+	char **dk_name;
308	+	struct diskstats *stats;
309	+	#endif
310	+	#ifdef NETBSD
311	+	#define MIBSIZE 3
312	+	#endif
313	+	#ifdef OPENBSD
314	+	#define MIBSIZE 2
315	+	#endif
316	+	#if defined(NETBSD) || defined(OPENBSD)
317	+	int num_disks, i;
318	+	int mib[MIBSIZE];
319	+	size_t size;
320	+	#endif
321	+
322	+	num_diskio=0;
323	+
324	+	#ifdef OPENBSD
325	+	mib[0] = CTL_HW;
326	+	mib[1] = HW_DISKCOUNT;
327	+
328	+	size = sizeof(diskcount);
329	+	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
330	+	return NULL;
331	+	}
332	+
333	+	mib[0] = CTL_HW;
334	+	mib[1] = HW_DISKNAMES;
335	+
336	+	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
337	+	return NULL;
338	+	}
339	+
340	+	disknames = sg_malloc(size);
341	+	if (disknames == NULL) {
342	+	return NULL;
343	+	}
344	+
345	+	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
346	+	return NULL;
347	+	}
348	+
349	+	dk_name = sg_malloc(diskcount * sizeof(char *));
350	+	bufpp = disknames;
351	+	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
352	+	dk_name[i] = name;
353	+	}
354	+	#endif
355	+
356	+	#if defined(NETBSD) || defined(OPENBSD)
357	+	mib[0] = CTL_HW;
358	+	mib[1] = HW_DISKSTATS;
359	+	#ifdef NETBSD
360	+	mib[2] = sizeof(struct disk_sysctl);
361	+	#endif
362	+
363	+	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
364	+	return NULL;
365	+	}
366	+
367	+	#ifdef NETBSD
368	+	num_disks = size / sizeof(struct disk_sysctl);
369	+	#else
370	+	num_disks = size / sizeof(struct diskstats);
371	+	#endif
372	+
373	+	stats = sg_malloc(size);
374	+	if (stats == NULL) {
375	+	return NULL;
376	+	}
377	+
378	+	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
379	+	return NULL;
380	+	}
381	+
382	+	for (i = 0; i < num_disks; i++) {
383	+	const char *name;
384	+	u_int64_t rbytes, wbytes;
385	+
386	+	#ifdef NETBSD
387	+	#ifdef HAVE_DK_RBYTES
388	+	rbytes = stats[i].dk_rbytes;
389	+	wbytes = stats[i].dk_wbytes;
390	+	#else
391	+	/* Before 1.7, NetBSD merged reads and writes. */
392	+	rbytes = wbytes = stats[i].dk_bytes;
393	+	#endif
394	+	#else
395	+	rbytes = wbytes = stats[i].ds_bytes;
396	+	#endif
397	+
398	+	/* Don't keep stats for disks that have never been used. */
399	+	if (rbytes == 0 && wbytes == 0) {
400	+	continue;
401	+	}
402	+
403	+	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
404	+	return NULL;
405	+	}
406	+	diskio_stats_ptr = diskio_stats + num_diskio;
407	+
408	+	diskio_stats_ptr->read_bytes = rbytes;
409	+	diskio_stats_ptr->write_bytes = wbytes;
410	+	#ifdef NETBSD
411	+	name = stats[i].dk_name;
412	+	#else
413	+	name = dk_name[i];
414	+	#endif
415	+	if (sg_update_string(&diskio_stats_ptr->disk_name, name) < 0) {
416	+	return NULL;
417	+	}
418	+	diskio_stats_ptr->systime = time(NULL);
419	+
420	+	num_diskio++;
421	+	}
422	+
423	+	free(stats);
424	+	#ifdef OPENBSD
425	+	free(dk_name);
426	+	free(disknames);
427	+	#endif
428	+	#endif
429	+
430	+	#if defined(FREEBSD) || defined(DFBSD)
431	+	if (!stats_init) {
432	+	stats.dinfo=sg_malloc(sizeof(struct devinfo));
433	+	if(stats.dinfo==NULL) return NULL;
434	+	bzero(stats.dinfo, sizeof(struct devinfo));
435	+	stats_init = 1;
436	+	}
437	+	#ifdef FREEBSD5
438	+	if ((devstat_getdevs(NULL, &stats)) < 0) return NULL;
439	+	/* Not aware of a get all devices, so i said 999. If we ever
440	+	* find a machine with more than 999 disks, then i'll change
441	+	* this number :)
442	+	*/
443	+	if (devstat_selectdevs(&dev_sel, &n_selected, &n_selections, &sel_gen, stats.dinfo->generation, stats.dinfo->devices, stats.dinfo->numdevs, NULL, 0, NULL, 0, DS_SELECT_ONLY, 999, 1) < 0) return NULL;
444	+	#else
445	+	if ((getdevs(&stats)) < 0) return NULL;
446	+	/* Not aware of a get all devices, so i said 999. If we ever
447	+	* find a machine with more than 999 disks, then i'll change
448	+	* this number :)
449	+	*/
450	+	if (selectdevs(&dev_sel, &n_selected, &n_selections, &sel_gen, stats.dinfo->generation, stats.dinfo->devices, stats.dinfo->numdevs, NULL, 0, NULL, 0, DS_SELECT_ONLY, 999, 1) < 0) return NULL;
451	+	#endif
452	+
453	+	for(counter=0;counter<stats.dinfo->numdevs;counter++){
454	+	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
455	+
456	+	/* Throw away devices that have done nothing, ever.. Eg "odd"
457	+	* devices.. like mem, proc.. and also doesn't report floppy
458	+	* drives etc unless they are doing stuff :)
459	+	*/
460	+	#ifdef FREEBSD5
461	+	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
462	+	#else
463	+	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
464	+	#endif
465	+
466	+	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
467	+	return NULL;
468	+	}
469	+	diskio_stats_ptr=diskio_stats+num_diskio;
470	+
471	+	#ifdef FREEBSD5
472	+	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
473	+	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
474	+	#else
475	+	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
476	+	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
477	+	#endif
478	+	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
479	+	if (asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number) == -1) {
480	+	return NULL;
481	+	}
482	+	diskio_stats_ptr->systime=time(NULL);
483	+
484	+	num_diskio++;
485	+	}
486	+	free(dev_sel);
487	+
488	+	#endif
489	+	#ifdef SOLARIS
490	+	if ((kc = kstat_open()) == NULL) {
491	+	return NULL;
492	+	}
493	+
494	+	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
495	+	if (!strcmp(ksp->ks_class, "disk")) {
496	+
497	+	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
498	+	/* We dont want metadevices appearins as num_diskio */
499	+	if(strcmp(ksp->ks_module, "md")==0) continue;
500	+	if((kstat_read(kc, ksp, &kios))==-1){
501	+	}
502	+
503	+	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
504	+	kstat_close(kc);
505	+	return NULL;
506	+	}
507	+	diskio_stats_ptr=diskio_stats+num_diskio;
508	+
509	+	diskio_stats_ptr->read_bytes=kios.nread;
510	+	diskio_stats_ptr->write_bytes=kios.nwritten;
511	+	if (sg_update_string(&diskio_stats_ptr->disk_name,
512	+	sg_get_svr_from_bsd(ksp->ks_name)) < 0) {
513	+	return NULL;
514	+	}
515	+	diskio_stats_ptr->systime=time(NULL);
516	+
517	+	num_diskio++;
518	+	}
519	+	}
520	+
521	+	kstat_close(kc);
522	+	#endif
523	+
524	+	#ifdef LINUX
525	+	num_diskio = 0;
526	+	n = 0;
527	+
528	+	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
529	+	have statistics in here too, so we can use those directly.
530	+	2.6 kernels have /proc/diskstats instead with almost (but not quite)
531	+	the same format. */
532	+
533	+	f = fopen("/proc/diskstats", "r");
534	+	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
535	+	if (f == NULL) {
536	+	f = fopen("/proc/partitions", "r");
537	+	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
538	+	}
539	+	if (f == NULL) goto out;
540	+	now = time(NULL);
541	+
542	+	while ((line_ptr = sg_f_read_line(f, "")) != NULL) {
543	+	char name[100];
544	+	char *s;
545	+	long long rsect, wsect;
546	+
547	+	int nr = sscanf(line_ptr, format,
548	+	&major, &minor, name, &rsect, &wsect);
549	+	if (nr < 3) continue;
550	+
551	+	/* Skip device names ending in numbers, since they're
552	+	partitions. */
553	+	s = name;
554	+	while (*s != '\0') s++;
555	+	--s;
556	+	if (*s >= '0' && *s <= '9') continue;
557	+
558	+	if (nr < 5) {
559	+	has_pp_stats = 0;
560	+	rsect = 0;
561	+	wsect = 0;
562	+	}
563	+
564	+	if (VECTOR_RESIZE(diskio_stats, n + 1) < 0) {
565	+	goto out;
566	+	}
567	+	if (VECTOR_RESIZE(parts, n + 1) < 0) {
568	+	goto out;
569	+	}
570	+
571	+	if (sg_update_string(&diskio_stats[n].disk_name, name) < 0) {
572	+	goto out;
573	+	}
574	+	diskio_stats[n].read_bytes = rsect * 512;
575	+	diskio_stats[n].write_bytes = wsect * 512;
576	+	diskio_stats[n].systime = now;
577	+	parts[n].major = major;
578	+	parts[n].minor = minor;
579	+
580	+	n++;
581	+	}
582	+
583	+	fclose(f);
584	+	f = NULL;
585	+
586	+	if (!has_pp_stats) {
587	+	/* This is an older kernel where /proc/partitions doesn't
588	+	contain stats. Read what we can from /proc/stat instead, and
589	+	fill in the appropriate bits of the list allocated above. */
590	+
591	+	f = fopen("/proc/stat", "r");
592	+	if (f == NULL) goto out;
593	+	now = time(NULL);
594	+
595	+	line_ptr = sg_f_read_line(f, "disk_io:");
596	+	if (line_ptr == NULL) goto out;
597	+
598	+	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
599	+	long long rsect, wsect;
600	+
601	+	if (*++line_ptr == '\0') break;
602	+
603	+	if((sscanf(line_ptr,
604	+	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
605	+	&major, &minor, &rsect, &wsect)) != 4) {
606	+	continue;
607	+	}
608	+
609	+	/* Find the corresponding device from earlier.
610	+	Just to add to the fun, "minor" is actually the disk
611	+	number, not the device minor, so we need to figure
612	+	out the real minor number based on the major!
613	+	This list is not exhaustive; if you're running
614	+	an older kernel you probably don't have fancy
615	+	I2O hardware anyway... */
616	+	switch (major) {
617	+	case 3:
618	+	case 21:
619	+	case 22:
620	+	case 33:
621	+	case 34:
622	+	case 36:
623	+	case 56:
624	+	case 57:
625	+	case 88:
626	+	case 89:
627	+	case 90:
628	+	case 91:
629	+	minor *= 64;
630	+	break;
631	+	case 9:
632	+	case 43:
633	+	break;
634	+	default:
635	+	minor *= 16;
636	+	break;
637	+	}
638	+	for (i = 0; i < n; i++) {
639	+	if (major == parts[i].major
640	+	&& minor == parts[i].minor)
641	+	break;
642	+	}
643	+	if (i == n) continue;
644	+
645	+	/* We read the number of blocks. Blocks are stored in
646	+	512 bytes */
647	+	diskio_stats[i].read_bytes = rsect * 512;
648	+	diskio_stats[i].write_bytes = wsect * 512;
649	+	diskio_stats[i].systime = now;
650	+	}
651	+	}
652	+
653	+	num_diskio = n;
654	+	out:
655	+	if (f != NULL) fclose(f);
656	+	#endif
657	+
658	+	#ifdef CYGWIN
659	+	return NULL;
660	+	#endif
661	+
662	+	*entries=num_diskio;
663	+
664	+	return diskio_stats;
665	+	}
666	+
667	+	sg_disk_io_stats *sg_get_disk_io_stats_diff(int *entries){
668	+	VECTOR_DECLARE_STATIC(diff, sg_disk_io_stats, 1,
669	+	diskio_stat_init, diskio_stat_destroy);
670	+	sg_disk_io_stats *src = NULL, *dest;
671	+	int i, j, diff_count, new_count;
672	+
673	+	if (diskio_stats == NULL) {
674	+	/* No previous stats, so we can't calculate a difference. */
675	+	return sg_get_disk_io_stats(entries);
676	+	}
677	+
678	+	/* Resize the results array to match the previous stats. */
679	+	diff_count = VECTOR_SIZE(diskio_stats);
680	+	if (VECTOR_RESIZE(diff, diff_count) < 0) {
681	+	return NULL;
682	+	}
683	+
684	+	/* Copy the previous stats into the result. */
685	+	for (i = 0; i < diff_count; i++) {
686	+	src = &diskio_stats[i];
687	+	dest = &diff[i];
688	+
689	+	if (sg_update_string(&dest->disk_name, src->disk_name) < 0) {
690	+	return NULL;
691	+	}
692	+	dest->read_bytes = src->read_bytes;
693	+	dest->write_bytes = src->write_bytes;
694	+	dest->systime = src->systime;
695	+	}
696	+
697	+	/* Get a new set of stats. */
698	+	if (sg_get_disk_io_stats(&new_count) == NULL) {
699	+	return NULL;
700	+	}
701	+
702	+	/* For each previous stat... */
703	+	for (i = 0; i < diff_count; i++) {
704	+	dest = &diff[i];
705	+
706	+	/* ... find the corresponding new stat ... */
707	+	for (j = 0; j < new_count; j++) {
708	+	/* Try the new stat in the same position first,
709	+	since that's most likely to be it. */
710	+	src = &diskio_stats[(i + j) % new_count];
711	+	if (strcmp(src->disk_name, dest->disk_name) == 0) {
712	+	break;
713	+	}
714	+	}
715	+	if (j == new_count) {
716	+	/* No match found. */
717	+	continue;
718	+	}
719	+
720	+	/* ... and subtract the previous stat from it to get the
721	+	difference. */
722	+	dest->read_bytes = src->read_bytes - dest->read_bytes;
723	+	dest->write_bytes = src->write_bytes - dest->write_bytes;
724	+	dest->systime = src->systime - dest->systime;
725	+	}
726	+
727	+	*entries = diff_count;
728	+	return diff;
729	+	}
730	+

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