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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 1.3 by tdb, Thu Feb 20 13:19:52 2003 UTC vs.
Revision 1.67 by ats, Thu Apr 8 13:44:44 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 <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>
32	–	#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;
60	<
61	<	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;
72	<	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	>	sg_set_error(SG_ERROR_GETMNTINFO, NULL);
132	>	return NULL;
133	>	}
134	>	for(;nummnt--; mp++){
135	>	valid_type = is_valid_fs_type(mp->f_fstypename);
136	>	#endif
137
138	<	if(watermark==-1){
139	<	disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
140	<	if(disk_stats==NULL){
141	<	return NULL;
85	<	}
86	<	watermark=START_VAL;
87	<	init_disk_stat(0, watermark-1, disk_stats);
138	>	#if defined(LINUX) || defined(CYGWIN)
139	>	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
140	>	sg_set_error(SG_ERROR_SETMNTENT, NULL);
141	>	return NULL;
142		}
143
144	+	while((mp=getmntent(f))){
145	+	if((statfs(mp->mnt_dir, &fs)) !=0){
146	+	continue;
147	+	}
148
149	+	valid_type = is_valid_fs_type(mp->mnt_type);
150	+	#endif
151	+
152	+	#ifdef SOLARIS
153		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
154	+	sg_set_error(SG_ERROR_OPEN, "/etc/mnttab");
155		return NULL;
156		}
157		while((getmntent(f, &mp)) == 0){
158		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
159		continue;
160		}
161	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
162	+	#endif
163
164	<	valid_type=0;
165	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
166	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
102	<	valid_type=1;
103	<	break;
164	>	if(valid_type){
165	>	if (VECTOR_RESIZE(disk_stats, num_disks + 1) < 0) {
166	>	return NULL;
167		}
168	<	}
168	>	disk_ptr=disk_stats+num_disks;
169
170	<	if(valid_type){
171	<	if(num_disks>watermark-1){
172	<	disk_ptr=disk_stats;
173	<	if((disk_stats=realloc(disk_stats, (watermark*2 * sizeof(disk_stat_t))))==NULL){
174	<	disk_stats=disk_ptr;
175	<	return NULL;
176	<	}
170	>	#ifdef ALLBSD
171	>	if (sg_update_string(&disk_ptr->device_name, mp->f_mntfromname) < 0) {
172	>	return NULL;
173	>	}
174	>	if (sg_update_string(&disk_ptr->fs_type, mp->f_fstypename) < 0) {
175	>	return NULL;
176	>	}
177	>	if (sg_update_string(&disk_ptr->mnt_point, mp->f_mntonname) < 0) {
178	>	return NULL;
179	>	}
180
181	<	watermark=watermark*2;
182	<	init_disk_stat(num_disks, watermark-1, disk_stats);
181	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
182	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
183	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
184	>
185	>	disk_ptr->total_inodes=(long long)mp->f_files;
186	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
187	>	/* Freebsd doesn't have a "available" inodes */
188	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
189	>	#endif
190	>	#if defined(LINUX) || defined(CYGWIN)
191	>	if (sg_update_string(&disk_ptr->device_name, mp->mnt_fsname) < 0) {
192	>	return NULL;
193		}
194	+
195	+	if (sg_update_string(&disk_ptr->fs_type, mp->mnt_type) < 0) {
196	+	return NULL;
197	+	}
198
199	<	disk_ptr=disk_stats+num_disks;
200	<
201	<	/* Memory leak in event of realloc failing */
199	>	if (sg_update_string(&disk_ptr->mnt_point, mp->mnt_dir) < 0) {
200	>	return NULL;
201	>	}
202	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
203	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
204	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
205	>
206	>	disk_ptr->total_inodes=(long long)fs.f_files;
207	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
208	>	/* Linux doesn't have a "available" inodes */
209	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
210	>	#endif
211	>
212	>	#ifdef SOLARIS
213		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
214	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
215	<	of a k each */
216	<	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
214	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
215	>	* be upwards of a k each
216	>	*/
217	>	if (sg_update_string(&disk_ptr->device_name, mp.mnt_special) < 0) {
218		return NULL;
219		}
220
221	<	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp.mnt_fstype))==NULL){
222	<	return NULL;
223	<	}
221	>	if (sg_update_string(&disk_ptr->fs_type, mp.mnt_fstype) < 0) {
222	>	return NULL;
223	>	}
224
225	<	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp.mnt_mountp))==NULL){
226	<	return NULL;
227	<	}
225	>	if (sg_update_string(&disk_ptr->mnt_point, mp.mnt_mountp) < 0) {
226	>	return NULL;
227	>	}
228
229		disk_ptr->size = (long long)fs.f_frsize * (long long)fs.f_blocks;
230		disk_ptr->avail = (long long)fs.f_frsize * (long long)fs.f_bavail;
#	Line 141 | Line 233 | disk_stat_t *get_disk_stats(int *entries){
233		disk_ptr->total_inodes=(long long)fs.f_files;
234		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
235		disk_ptr->free_inodes=(long long)fs.f_favail;
236	<
236	>	#endif
237		num_disks++;
238		}
239		}
240
241		*entries=num_disks;
242
243	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
243	>	/* If this fails, there is very little i can do about it, so
244	>	I'll ignore it :) */
245	>	#if defined(LINUX) || defined(CYGWIN)
246	>	endmntent(f);
247	>	#endif
248	>	#if defined(SOLARIS)
249		fclose(f);
250	+	#endif
251
252		return disk_stats;
253
254		}
255
256	<	diskio_stat_t *get_diskio_stats(int *entries){
256	>	int sg_fs_compare_device_name(const void *va, const void *vb) {
257	>	const sg_fs_stats *a = (const sg_fs_stats *)va;
258	>	const sg_fs_stats *b = (const sg_fs_stats *)vb;
259
260	<	/* Do jibble */
260	>	return strcmp(a->device_name, b->device_name);
261	>	}
262	>
263	>	int sg_fs_compare_mnt_point(const void *va, const void *vb) {
264	>	const sg_fs_stats *a = (const sg_fs_stats *)va;
265	>	const sg_fs_stats *b = (const sg_fs_stats *)vb;
266	>
267	>	return strcmp(a->mnt_point, b->mnt_point);
268	>	}
269	>
270	>	static void diskio_stat_init(sg_disk_io_stats *d) {
271	>	d->disk_name = NULL;
272	>	}
273	>
274	>	static void diskio_stat_destroy(sg_disk_io_stats *d) {
275	>	free(d->disk_name);
276	>	}
277	>
278	>	VECTOR_DECLARE_STATIC(diskio_stats, sg_disk_io_stats, 10,
279	>	diskio_stat_init, diskio_stat_destroy);
280	>
281	>	#ifdef LINUX
282	>	typedef struct {
283	>	int major;
284	>	int minor;
285	>	} partition;
286	>	#endif
287	>
288	>	sg_disk_io_stats *sg_get_disk_io_stats(int *entries){
289	>	int num_diskio;
290	>	#ifndef LINUX
291	>	sg_disk_io_stats *diskio_stats_ptr;
292	>	#endif
293	>
294	>	#ifdef SOLARIS
295	>	kstat_ctl_t *kc;
296	>	kstat_t *ksp;
297	>	kstat_io_t kios;
298	>	#endif
299	>	#ifdef LINUX
300	>	FILE *f;
301	>	char *line_ptr;
302	>	int major, minor;
303	>	int has_pp_stats = 1;
304	>	VECTOR_DECLARE_STATIC(parts, partition, 16, NULL, NULL);
305	>	int i, n;
306	>	time_t now;
307	>	const char *format;
308	>	#endif
309	>	#if defined(FREEBSD) || defined(DFBSD)
310	>	static struct statinfo stats;
311	>	static int stats_init = 0;
312	>	int counter;
313	>	struct device_selection *dev_sel = NULL;
314	>	int n_selected, n_selections;
315	>	long sel_gen;
316	>	struct devstat *dev_ptr;
317	>	#endif
318	>	#ifdef NETBSD
319	>	struct disk_sysctl *stats;
320	>	#endif
321	>	#ifdef OPENBSD
322	>	int diskcount;
323	>	char *disknames, *name, *bufpp;
324	>	char **dk_name;
325	>	struct diskstats *stats;
326	>	#endif
327	>	#ifdef NETBSD
328	>	#define MIBSIZE 3
329	>	#endif
330	>	#ifdef OPENBSD
331	>	#define MIBSIZE 2
332	>	#endif
333	>	#if defined(NETBSD) || defined(OPENBSD)
334	>	int num_disks, i;
335	>	int mib[MIBSIZE];
336	>	size_t size;
337	>	#endif
338	>
339	>	num_diskio=0;
340	>
341	>	#ifdef OPENBSD
342	>	mib[0] = CTL_HW;
343	>	mib[1] = HW_DISKCOUNT;
344	>
345	>	size = sizeof(diskcount);
346	>	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
347	>	sg_error(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKCOUNT");
348	>	return NULL;
349	>	}
350	>
351	>	mib[0] = CTL_HW;
352	>	mib[1] = HW_DISKNAMES;
353	>
354	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
355	>	sg_error(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKNAMES");
356	>	return NULL;
357	>	}
358	>
359	>	disknames = sg_malloc(size);
360	>	if (disknames == NULL) {
361	>	return NULL;
362	>	}
363	>
364	>	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
365	>	sg_error(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKNAMES");
366	>	return NULL;
367	>	}
368	>
369	>	dk_name = sg_malloc(diskcount * sizeof(char *));
370	>	bufpp = disknames;
371	>	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
372	>	dk_name[i] = name;
373	>	}
374	>	#endif
375	>
376	>	#if defined(NETBSD) || defined(OPENBSD)
377	>	mib[0] = CTL_HW;
378	>	mib[1] = HW_DISKSTATS;
379	>	#ifdef NETBSD
380	>	mib[2] = sizeof(struct disk_sysctl);
381	>	#endif
382	>
383	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
384	>	sg_error(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKSTATS");
385	>	return NULL;
386	>	}
387	>
388	>	#ifdef NETBSD
389	>	num_disks = size / sizeof(struct disk_sysctl);
390	>	#else
391	>	num_disks = size / sizeof(struct diskstats);
392	>	#endif
393	>
394	>	stats = sg_malloc(size);
395	>	if (stats == NULL) {
396	>	return NULL;
397	>	}
398	>
399	>	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
400	>	sg_error(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKSTATS");
401	>	return NULL;
402	>	}
403	>
404	>	for (i = 0; i < num_disks; i++) {
405	>	const char *name;
406	>	u_int64_t rbytes, wbytes;
407	>
408	>	#ifdef NETBSD
409	>	#ifdef HAVE_DK_RBYTES
410	>	rbytes = stats[i].dk_rbytes;
411	>	wbytes = stats[i].dk_wbytes;
412	>	#else
413	>	/* Before 1.7, NetBSD merged reads and writes. */
414	>	rbytes = wbytes = stats[i].dk_bytes;
415	>	#endif
416	>	#else
417	>	rbytes = wbytes = stats[i].ds_bytes;
418	>	#endif
419	>
420	>	/* Don't keep stats for disks that have never been used. */
421	>	if (rbytes == 0 && wbytes == 0) {
422	>	continue;
423	>	}
424	>
425	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
426	>	return NULL;
427	>	}
428	>	diskio_stats_ptr = diskio_stats + num_diskio;
429	>
430	>	diskio_stats_ptr->read_bytes = rbytes;
431	>	diskio_stats_ptr->write_bytes = wbytes;
432	>	#ifdef NETBSD
433	>	name = stats[i].dk_name;
434	>	#else
435	>	name = dk_name[i];
436	>	#endif
437	>	if (sg_update_string(&diskio_stats_ptr->disk_name, name) < 0) {
438	>	return NULL;
439	>	}
440	>	diskio_stats_ptr->systime = time(NULL);
441	>
442	>	num_diskio++;
443	>	}
444	>
445	>	free(stats);
446	>	#ifdef OPENBSD
447	>	free(dk_name);
448	>	free(disknames);
449	>	#endif
450	>	#endif
451	>
452	>	#if defined(FREEBSD) || defined(DFBSD)
453	>	if (!stats_init) {
454	>	stats.dinfo=sg_malloc(sizeof(struct devinfo));
455	>	if(stats.dinfo==NULL) return NULL;
456	>	bzero(stats.dinfo, sizeof(struct devinfo));
457	>	stats_init = 1;
458	>	}
459	>	#ifdef FREEBSD5
460	>	if ((devstat_getdevs(NULL, &stats)) < 0) {
461	>	sg_set_error(SG_ERROR_DEVSTAT_GETDEVS, NULL);
462	>	return NULL;
463	>	}
464	>	/* Not aware of a get all devices, so i said 999. If we ever
465	>	* find a machine with more than 999 disks, then i'll change
466	>	* this number :)
467	>	*/
468	>	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) {
469	>	sg_set_error(SG_ERROR_DEVSTAT_SELECTDEVS, NULL);
470	>	return NULL;
471	>	}
472	>	#else
473	>	if ((getdevs(&stats)) < 0) {
474	>	sg_set_error(SG_ERROR_DEVSTAT_GETDEVS, NULL);
475	>	return NULL;
476	>	}
477	>	/* Not aware of a get all devices, so i said 999. If we ever
478	>	* find a machine with more than 999 disks, then i'll change
479	>	* this number :)
480	>	*/
481	>	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) {
482	>	sg_set_error(SG_ERROR_DEVSTAT_SELECTDEVS, NULL);
483	>	return NULL;
484	>	}
485	>	#endif
486	>
487	>	for(counter=0;counter<stats.dinfo->numdevs;counter++){
488	>	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
489	>
490	>	/* Throw away devices that have done nothing, ever.. Eg "odd"
491	>	* devices.. like mem, proc.. and also doesn't report floppy
492	>	* drives etc unless they are doing stuff :)
493	>	*/
494	>	#ifdef FREEBSD5
495	>	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
496	>	#else
497	>	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
498	>	#endif
499	>
500	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
501	>	return NULL;
502	>	}
503	>	diskio_stats_ptr=diskio_stats+num_diskio;
504	>
505	>	#ifdef FREEBSD5
506	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
507	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
508	>	#else
509	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
510	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
511	>	#endif
512	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
513	>	if (asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number) == -1) {
514	>	sg_set_error(SG_ERROR_ASPRINTF, NULL);
515	>	return NULL;
516	>	}
517	>	diskio_stats_ptr->systime=time(NULL);
518	>
519	>	num_diskio++;
520	>	}
521	>	free(dev_sel);
522	>
523	>	#endif
524	>	#ifdef SOLARIS
525	>	if ((kc = kstat_open()) == NULL) {
526	>	sg_set_error(SG_ERROR_KSTAT_OPEN, NULL);
527	>	return NULL;
528	>	}
529	>
530	>	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
531	>	if (!strcmp(ksp->ks_class, "disk")) {
532	>
533	>	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
534	>	/* We dont want metadevices appearins as num_diskio */
535	>	if(strcmp(ksp->ks_module, "md")==0) continue;
536	>	if((kstat_read(kc, ksp, &kios))==-1){
537	>	}
538	>
539	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
540	>	kstat_close(kc);
541	>	return NULL;
542	>	}
543	>	diskio_stats_ptr=diskio_stats+num_diskio;
544	>
545	>	diskio_stats_ptr->read_bytes=kios.nread;
546	>	diskio_stats_ptr->write_bytes=kios.nwritten;
547	>	if (sg_update_string(&diskio_stats_ptr->disk_name,
548	>	sg_get_svr_from_bsd(ksp->ks_name)) < 0) {
549	>	return NULL;
550	>	}
551	>	diskio_stats_ptr->systime=time(NULL);
552	>
553	>	num_diskio++;
554	>	}
555	>	}
556	>
557	>	kstat_close(kc);
558	>	#endif
559	>
560	>	#ifdef LINUX
561	>	num_diskio = 0;
562	>	n = 0;
563	>
564	>	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
565	>	have statistics in here too, so we can use those directly.
566	>	2.6 kernels have /proc/diskstats instead with almost (but not quite)
567	>	the same format. */
568	>
569	>	f = fopen("/proc/diskstats", "r");
570	>	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
571	>	if (f == NULL) {
572	>	f = fopen("/proc/partitions", "r");
573	>	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
574	>	}
575	>	if (f == NULL) goto out;
576	>	now = time(NULL);
577	>
578	>	while ((line_ptr = sg_f_read_line(f, "")) != NULL) {
579	>	char name[100];
580	>	char *s;
581	>	long long rsect, wsect;
582	>
583	>	int nr = sscanf(line_ptr, format,
584	>	&major, &minor, name, &rsect, &wsect);
585	>	if (nr < 3) continue;
586	>
587	>	/* Skip device names ending in numbers, since they're
588	>	partitions. */
589	>	s = name;
590	>	while (*s != '\0') s++;
591	>	--s;
592	>	if (*s >= '0' && *s <= '9') continue;
593	>
594	>	if (nr < 5) {
595	>	has_pp_stats = 0;
596	>	rsect = 0;
597	>	wsect = 0;
598	>	}
599	>
600	>	if (VECTOR_RESIZE(diskio_stats, n + 1) < 0) {
601	>	goto out;
602	>	}
603	>	if (VECTOR_RESIZE(parts, n + 1) < 0) {
604	>	goto out;
605	>	}
606	>
607	>	if (sg_update_string(&diskio_stats[n].disk_name, name) < 0) {
608	>	goto out;
609	>	}
610	>	diskio_stats[n].read_bytes = rsect * 512;
611	>	diskio_stats[n].write_bytes = wsect * 512;
612	>	diskio_stats[n].systime = now;
613	>	parts[n].major = major;
614	>	parts[n].minor = minor;
615	>
616	>	n++;
617	>	}
618	>
619	>	fclose(f);
620	>	f = NULL;
621	>
622	>	if (!has_pp_stats) {
623	>	/* This is an older kernel where /proc/partitions doesn't
624	>	contain stats. Read what we can from /proc/stat instead, and
625	>	fill in the appropriate bits of the list allocated above. */
626	>
627	>	f = fopen("/proc/stat", "r");
628	>	if (f == NULL) goto out;
629	>	now = time(NULL);
630	>
631	>	line_ptr = sg_f_read_line(f, "disk_io:");
632	>	if (line_ptr == NULL) goto out;
633	>
634	>	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
635	>	long long rsect, wsect;
636	>
637	>	if (*++line_ptr == '\0') break;
638	>
639	>	if((sscanf(line_ptr,
640	>	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
641	>	&major, &minor, &rsect, &wsect)) != 4) {
642	>	continue;
643	>	}
644	>
645	>	/* Find the corresponding device from earlier.
646	>	Just to add to the fun, "minor" is actually the disk
647	>	number, not the device minor, so we need to figure
648	>	out the real minor number based on the major!
649	>	This list is not exhaustive; if you're running
650	>	an older kernel you probably don't have fancy
651	>	I2O hardware anyway... */
652	>	switch (major) {
653	>	case 3:
654	>	case 21:
655	>	case 22:
656	>	case 33:
657	>	case 34:
658	>	case 36:
659	>	case 56:
660	>	case 57:
661	>	case 88:
662	>	case 89:
663	>	case 90:
664	>	case 91:
665	>	minor *= 64;
666	>	break;
667	>	case 9:
668	>	case 43:
669	>	break;
670	>	default:
671	>	minor *= 16;
672	>	break;
673	>	}
674	>	for (i = 0; i < n; i++) {
675	>	if (major == parts[i].major
676	>	&& minor == parts[i].minor)
677	>	break;
678	>	}
679	>	if (i == n) continue;
680	>
681	>	/* We read the number of blocks. Blocks are stored in
682	>	512 bytes */
683	>	diskio_stats[i].read_bytes = rsect * 512;
684	>	diskio_stats[i].write_bytes = wsect * 512;
685	>	diskio_stats[i].systime = now;
686	>	}
687	>	}
688	>
689	>	num_diskio = n;
690	>	out:
691	>	if (f != NULL) fclose(f);
692	>	#endif
693	>
694	>	#ifdef CYGWIN
695	>	sg_set_error(SG_ERROR_UNSUPPORTED, "Cygwin");
696		return NULL;
697	+	#endif
698	+
699	+	*entries=num_diskio;
700	+
701	+	return diskio_stats;
702		}
703	+
704	+	sg_disk_io_stats *sg_get_disk_io_stats_diff(int *entries){
705	+	VECTOR_DECLARE_STATIC(diff, sg_disk_io_stats, 1,
706	+	diskio_stat_init, diskio_stat_destroy);
707	+	sg_disk_io_stats *src = NULL, *dest;
708	+	int i, j, diff_count, new_count;
709	+
710	+	if (diskio_stats == NULL) {
711	+	/* No previous stats, so we can't calculate a difference. */
712	+	return sg_get_disk_io_stats(entries);
713	+	}
714	+
715	+	/* Resize the results array to match the previous stats. */
716	+	diff_count = VECTOR_SIZE(diskio_stats);
717	+	if (VECTOR_RESIZE(diff, diff_count) < 0) {
718	+	return NULL;
719	+	}
720	+
721	+	/* Copy the previous stats into the result. */
722	+	for (i = 0; i < diff_count; i++) {
723	+	src = &diskio_stats[i];
724	+	dest = &diff[i];
725	+
726	+	if (sg_update_string(&dest->disk_name, src->disk_name) < 0) {
727	+	return NULL;
728	+	}
729	+	dest->read_bytes = src->read_bytes;
730	+	dest->write_bytes = src->write_bytes;
731	+	dest->systime = src->systime;
732	+	}
733	+
734	+	/* Get a new set of stats. */
735	+	if (sg_get_disk_io_stats(&new_count) == NULL) {
736	+	return NULL;
737	+	}
738	+
739	+	/* For each previous stat... */
740	+	for (i = 0; i < diff_count; i++) {
741	+	dest = &diff[i];
742	+
743	+	/* ... find the corresponding new stat ... */
744	+	for (j = 0; j < new_count; j++) {
745	+	/* Try the new stat in the same position first,
746	+	since that's most likely to be it. */
747	+	src = &diskio_stats[(i + j) % new_count];
748	+	if (strcmp(src->disk_name, dest->disk_name) == 0) {
749	+	break;
750	+	}
751	+	}
752	+	if (j == new_count) {
753	+	/* No match found. */
754	+	continue;
755	+	}
756	+
757	+	/* ... and subtract the previous stat from it to get the
758	+	difference. */
759	+	dest->read_bytes = src->read_bytes - dest->read_bytes;
760	+	dest->write_bytes = src->write_bytes - dest->write_bytes;
761	+	dest->systime = src->systime - dest->systime;
762	+	}
763	+
764	+	*entries = diff_count;
765	+	return diff;
766	+	}
767	+
768	+	int sg_disk_io_compare_name(const void *va, const void *vb) {
769	+	const sg_disk_io_stats *a = (const sg_disk_io_stats *)va;
770	+	const sg_disk_io_stats *b = (const sg_disk_io_stats *)vb;
771	+
772	+	return strcmp(a->disk_name, b->disk_name);
773	+	}
774	+

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