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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 1.72 by ats, Sun Jul 18 21:30:11 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	+	#include <kstat.h>
40	+	#define VALID_FS_TYPES {"ufs", "tmpfs", "vxfs"}
41	+	#endif
42
43	<	#define VALID_FS_TYPES {"ufs", "tmpfs"}
43	>	#if defined(LINUX) || defined(CYGWIN)
44	>	#include <mntent.h>
45	>	#include <sys/vfs.h>
46	>	#endif
47
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	<	#define START_VAL 1
56	>	#ifdef CYGWIN
57	>	#define VALID_FS_TYPES {"user"}
58	>	#endif
59
60	<	char *copy_string(char *orig_ptr, const char *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	<	/* Maybe free if not NULL, and strdup rather than realloc and strcpy? */
80	<	orig_ptr=realloc(orig_ptr, (1+strlen(newtext)));
81	<	if(orig_ptr==NULL){
82	<	return NULL;
83	<	}
48	<	strcpy(orig_ptr, newtext);
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	<	return orig_ptr;
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	+	static int is_valid_fs_type(const char *type) {
92	+	const char *types[] = VALID_FS_TYPES;
93	+	int i;
94
95	<	void init_disk_stat(int start, int end, disk_stat_t *disk_stats){
96	<
97	<	for(disk_stats+=start; start<=end; start++){
98	<	disk_stats->device_name=NULL;
58	<	disk_stats->fs_type=NULL;
59	<	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	>	#ifdef HAVE_STATVFS
126	>	struct statvfs *mp;
127	>	#else
128	>	struct statfs *mp;
129	>	#endif
130	>	#endif
131
132	<	disk_stat_t *disk_ptr;
132	>	#ifdef ALLBSD
133	>	nummnt=getmntinfo(&mp , MNT_LOCAL);
134	>	if (nummnt<=0){
135	>	sg_set_error_with_errno(SG_ERROR_GETMNTINFO, NULL);
136	>	return NULL;
137	>	}
138	>	for(;nummnt--; mp++){
139	>	valid_type = is_valid_fs_type(mp->f_fstypename);
140	>	#endif
141
142	<	if(watermark==-1){
143	<	disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
144	<	if(disk_stats==NULL){
145	<	return NULL;
85	<	}
86	<	watermark=START_VAL;
87	<	init_disk_stat(0, watermark-1, disk_stats);
142	>	#if defined(LINUX) || defined(CYGWIN)
143	>	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
144	>	sg_set_error(SG_ERROR_SETMNTENT, NULL);
145	>	return NULL;
146		}
147
148	+	while((mp=getmntent(f))){
149	+	if((statfs(mp->mnt_dir, &fs)) !=0){
150	+	continue;
151	+	}
152
153	+	valid_type = is_valid_fs_type(mp->mnt_type);
154	+	#endif
155	+
156	+	#ifdef SOLARIS
157		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
158	+	sg_set_error_with_errno(SG_ERROR_OPEN, "/etc/mnttab");
159		return NULL;
160		}
161		while((getmntent(f, &mp)) == 0){
162		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
163		continue;
164		}
165	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
166	+	#endif
167
168	<	valid_type=0;
169	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
170	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
102	<	valid_type=1;
103	<	break;
168	>	if(valid_type){
169	>	if (VECTOR_RESIZE(disk_stats, num_disks + 1) < 0) {
170	>	return NULL;
171		}
172	<	}
172	>	disk_ptr=disk_stats+num_disks;
173
174	<	if(valid_type){
175	<	if(num_disks>watermark-1){
176	<	disk_ptr=disk_stats;
177	<	if((disk_stats=realloc(disk_stats, (watermark*2 * sizeof(disk_stat_t))))==NULL){
178	<	disk_stats=disk_ptr;
179	<	return NULL;
180	<	}
174	>	#ifdef ALLBSD
175	>	if (sg_update_string(&disk_ptr->device_name, mp->f_mntfromname) < 0) {
176	>	return NULL;
177	>	}
178	>	if (sg_update_string(&disk_ptr->fs_type, mp->f_fstypename) < 0) {
179	>	return NULL;
180	>	}
181	>	if (sg_update_string(&disk_ptr->mnt_point, mp->f_mntonname) < 0) {
182	>	return NULL;
183	>	}
184
185	<	watermark=watermark*2;
186	<	init_disk_stat(num_disks, watermark-1, disk_stats);
185	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
186	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
187	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
188	>
189	>	disk_ptr->total_inodes=(long long)mp->f_files;
190	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
191	>	/* Freebsd doesn't have a "available" inodes */
192	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
193	>	#endif
194	>	#if defined(LINUX) || defined(CYGWIN)
195	>	if (sg_update_string(&disk_ptr->device_name, mp->mnt_fsname) < 0) {
196	>	return NULL;
197		}
198	+
199	+	if (sg_update_string(&disk_ptr->fs_type, mp->mnt_type) < 0) {
200	+	return NULL;
201	+	}
202
203	<	disk_ptr=disk_stats+num_disks;
204	<
205	<	/* Memory leak in event of realloc failing */
203	>	if (sg_update_string(&disk_ptr->mnt_point, mp->mnt_dir) < 0) {
204	>	return NULL;
205	>	}
206	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
207	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
208	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
209	>
210	>	disk_ptr->total_inodes=(long long)fs.f_files;
211	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
212	>	/* Linux doesn't have a "available" inodes */
213	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
214	>	#endif
215	>
216	>	#ifdef SOLARIS
217		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
218	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
219	<	of a k each */
220	<	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
218	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
219	>	* be upwards of a k each
220	>	*/
221	>	if (sg_update_string(&disk_ptr->device_name, mp.mnt_special) < 0) {
222		return NULL;
223		}
224
225	<	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp.mnt_fstype))==NULL){
226	<	return NULL;
227	<	}
225	>	if (sg_update_string(&disk_ptr->fs_type, mp.mnt_fstype) < 0) {
226	>	return NULL;
227	>	}
228
229	<	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp.mnt_mountp))==NULL){
230	<	return NULL;
231	<	}
229	>	if (sg_update_string(&disk_ptr->mnt_point, mp.mnt_mountp) < 0) {
230	>	return NULL;
231	>	}
232
233		disk_ptr->size = (long long)fs.f_frsize * (long long)fs.f_blocks;
234		disk_ptr->avail = (long long)fs.f_frsize * (long long)fs.f_bavail;
#	Line 141 | Line 237 | disk_stat_t *get_disk_stats(int *entries){
237		disk_ptr->total_inodes=(long long)fs.f_files;
238		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
239		disk_ptr->free_inodes=(long long)fs.f_favail;
240	<
240	>	#endif
241		num_disks++;
242		}
243		}
244
245		*entries=num_disks;
246
247	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
247	>	/* If this fails, there is very little i can do about it, so
248	>	I'll ignore it :) */
249	>	#if defined(LINUX) || defined(CYGWIN)
250	>	endmntent(f);
251	>	#endif
252	>	#if defined(SOLARIS)
253		fclose(f);
254	+	#endif
255
256		return disk_stats;
257
258		}
259
260	<	diskio_stat_t *get_diskio_stats(int *entries){
260	>	int sg_fs_compare_device_name(const void *va, const void *vb) {
261	>	const sg_fs_stats *a = (const sg_fs_stats *)va;
262	>	const sg_fs_stats *b = (const sg_fs_stats *)vb;
263
264	<	/* Do jibble */
264	>	return strcmp(a->device_name, b->device_name);
265	>	}
266	>
267	>	int sg_fs_compare_mnt_point(const void *va, const void *vb) {
268	>	const sg_fs_stats *a = (const sg_fs_stats *)va;
269	>	const sg_fs_stats *b = (const sg_fs_stats *)vb;
270	>
271	>	return strcmp(a->mnt_point, b->mnt_point);
272	>	}
273	>
274	>	static void diskio_stat_init(sg_disk_io_stats *d) {
275	>	d->disk_name = NULL;
276	>	}
277	>
278	>	static void diskio_stat_destroy(sg_disk_io_stats *d) {
279	>	free(d->disk_name);
280	>	}
281	>
282	>	VECTOR_DECLARE_STATIC(diskio_stats, sg_disk_io_stats, 10,
283	>	diskio_stat_init, diskio_stat_destroy);
284	>
285	>	#ifdef LINUX
286	>	typedef struct {
287	>	int major;
288	>	int minor;
289	>	} partition;
290	>	#endif
291	>
292	>	sg_disk_io_stats *sg_get_disk_io_stats(int *entries){
293	>	int num_diskio;
294	>	#ifndef LINUX
295	>	sg_disk_io_stats *diskio_stats_ptr;
296	>	#endif
297	>
298	>	#ifdef SOLARIS
299	>	kstat_ctl_t *kc;
300	>	kstat_t *ksp;
301	>	kstat_io_t kios;
302	>	#endif
303	>	#ifdef LINUX
304	>	FILE *f;
305	>	char *line_ptr;
306	>	int major, minor;
307	>	int has_pp_stats = 1;
308	>	VECTOR_DECLARE_STATIC(parts, partition, 16, NULL, NULL);
309	>	int i, n;
310	>	time_t now;
311	>	const char *format;
312	>	#endif
313	>	#if defined(FREEBSD) || defined(DFBSD)
314	>	static struct statinfo stats;
315	>	static int stats_init = 0;
316	>	int counter;
317	>	struct device_selection *dev_sel = NULL;
318	>	int n_selected, n_selections;
319	>	long sel_gen;
320	>	struct devstat *dev_ptr;
321	>	#endif
322	>	#ifdef NETBSD
323	>	struct disk_sysctl *stats;
324	>	#endif
325	>	#ifdef OPENBSD
326	>	int diskcount;
327	>	char *disknames, *name, *bufpp;
328	>	char **dk_name;
329	>	struct diskstats *stats;
330	>	#endif
331	>	#ifdef NETBSD
332	>	#define MIBSIZE 3
333	>	#endif
334	>	#ifdef OPENBSD
335	>	#define MIBSIZE 2
336	>	#endif
337	>	#if defined(NETBSD) || defined(OPENBSD)
338	>	int num_disks, i;
339	>	int mib[MIBSIZE];
340	>	size_t size;
341	>	#endif
342	>
343	>	num_diskio=0;
344	>
345	>	#ifdef OPENBSD
346	>	mib[0] = CTL_HW;
347	>	mib[1] = HW_DISKCOUNT;
348	>
349	>	size = sizeof(diskcount);
350	>	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
351	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKCOUNT");
352	>	return NULL;
353	>	}
354	>
355	>	mib[0] = CTL_HW;
356	>	mib[1] = HW_DISKNAMES;
357	>
358	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
359	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKNAMES");
360	>	return NULL;
361	>	}
362	>
363	>	disknames = sg_malloc(size);
364	>	if (disknames == NULL) {
365	>	return NULL;
366	>	}
367	>
368	>	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
369	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKNAMES");
370	>	return NULL;
371	>	}
372	>
373	>	dk_name = sg_malloc(diskcount * sizeof(char *));
374	>	bufpp = disknames;
375	>	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
376	>	dk_name[i] = name;
377	>	}
378	>	#endif
379	>
380	>	#if defined(NETBSD) || defined(OPENBSD)
381	>	mib[0] = CTL_HW;
382	>	mib[1] = HW_DISKSTATS;
383	>	#ifdef NETBSD
384	>	mib[2] = sizeof(struct disk_sysctl);
385	>	#endif
386	>
387	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
388	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKSTATS");
389	>	return NULL;
390	>	}
391	>
392	>	#ifdef NETBSD
393	>	num_disks = size / sizeof(struct disk_sysctl);
394	>	#else
395	>	num_disks = size / sizeof(struct diskstats);
396	>	#endif
397	>
398	>	stats = sg_malloc(size);
399	>	if (stats == NULL) {
400	>	return NULL;
401	>	}
402	>
403	>	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
404	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKSTATS");
405	>	return NULL;
406	>	}
407	>
408	>	for (i = 0; i < num_disks; i++) {
409	>	const char *name;
410	>	u_int64_t rbytes, wbytes;
411	>
412	>	#ifdef NETBSD
413	>	#ifdef HAVE_DK_RBYTES
414	>	rbytes = stats[i].dk_rbytes;
415	>	wbytes = stats[i].dk_wbytes;
416	>	#else
417	>	/* Before 2.0, NetBSD merged reads and writes. */
418	>	rbytes = wbytes = stats[i].dk_bytes;
419	>	#endif
420	>	#else
421	>	#ifdef HAVE_DS_RBYTES
422	>	rbytes = stats[i].ds_rbytes;
423	>	wbytes = stats[i].ds_wbytes;
424	>	#else
425	>	/* Before 3.5, OpenBSD merged reads and writes */
426	>	rbytes = wbytes = stats[i].ds_bytes;
427	>	#endif
428	>	#endif
429	>
430	>	/* Don't keep stats for disks that have never been used. */
431	>	if (rbytes == 0 && wbytes == 0) {
432	>	continue;
433	>	}
434	>
435	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
436	>	return NULL;
437	>	}
438	>	diskio_stats_ptr = diskio_stats + num_diskio;
439	>
440	>	diskio_stats_ptr->read_bytes = rbytes;
441	>	diskio_stats_ptr->write_bytes = wbytes;
442	>	#ifdef NETBSD
443	>	name = stats[i].dk_name;
444	>	#else
445	>	name = dk_name[i];
446	>	#endif
447	>	if (sg_update_string(&diskio_stats_ptr->disk_name, name) < 0) {
448	>	return NULL;
449	>	}
450	>	diskio_stats_ptr->systime = time(NULL);
451	>
452	>	num_diskio++;
453	>	}
454	>
455	>	free(stats);
456	>	#ifdef OPENBSD
457	>	free(dk_name);
458	>	free(disknames);
459	>	#endif
460	>	#endif
461	>
462	>	#if defined(FREEBSD) || defined(DFBSD)
463	>	if (!stats_init) {
464	>	stats.dinfo=sg_malloc(sizeof(struct devinfo));
465	>	if(stats.dinfo==NULL) return NULL;
466	>	bzero(stats.dinfo, sizeof(struct devinfo));
467	>	stats_init = 1;
468	>	}
469	>	#ifdef FREEBSD5
470	>	if ((devstat_getdevs(NULL, &stats)) < 0) {
471	>	/* FIXME devstat functions return a string error in
472	>	devstat_errbuf */
473	>	sg_set_error(SG_ERROR_DEVSTAT_GETDEVS, NULL);
474	>	return NULL;
475	>	}
476	>	/* Not aware of a get all devices, so i said 999. If we ever
477	>	* find a machine with more than 999 disks, then i'll change
478	>	* this number :)
479	>	*/
480	>	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) {
481	>	sg_set_error(SG_ERROR_DEVSTAT_SELECTDEVS, NULL);
482	>	return NULL;
483	>	}
484	>	#else
485	>	if ((getdevs(&stats)) < 0) {
486	>	sg_set_error(SG_ERROR_DEVSTAT_GETDEVS, NULL);
487	>	return NULL;
488	>	}
489	>	/* Not aware of a get all devices, so i said 999. If we ever
490	>	* find a machine with more than 999 disks, then i'll change
491	>	* this number :)
492	>	*/
493	>	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) {
494	>	sg_set_error(SG_ERROR_DEVSTAT_SELECTDEVS, NULL);
495	>	return NULL;
496	>	}
497	>	#endif
498	>
499	>	for(counter=0;counter<stats.dinfo->numdevs;counter++){
500	>	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
501	>
502	>	/* Throw away devices that have done nothing, ever.. Eg "odd"
503	>	* devices.. like mem, proc.. and also doesn't report floppy
504	>	* drives etc unless they are doing stuff :)
505	>	*/
506	>	#ifdef FREEBSD5
507	>	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
508	>	#else
509	>	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
510	>	#endif
511	>
512	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
513	>	return NULL;
514	>	}
515	>	diskio_stats_ptr=diskio_stats+num_diskio;
516	>
517	>	#ifdef FREEBSD5
518	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
519	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
520	>	#else
521	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
522	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
523	>	#endif
524	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
525	>	if (asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number) == -1) {
526	>	sg_set_error_with_errno(SG_ERROR_ASPRINTF, NULL);
527	>	return NULL;
528	>	}
529	>	diskio_stats_ptr->systime=time(NULL);
530	>
531	>	num_diskio++;
532	>	}
533	>	free(dev_sel);
534	>
535	>	#endif
536	>	#ifdef SOLARIS
537	>	if ((kc = kstat_open()) == NULL) {
538	>	sg_set_error(SG_ERROR_KSTAT_OPEN, NULL);
539	>	return NULL;
540	>	}
541	>
542	>	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
543	>	if (!strcmp(ksp->ks_class, "disk")) {
544	>
545	>	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
546	>	/* We dont want metadevices appearins as num_diskio */
547	>	if(strcmp(ksp->ks_module, "md")==0) continue;
548	>	if((kstat_read(kc, ksp, &kios))==-1){
549	>	}
550	>
551	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
552	>	kstat_close(kc);
553	>	return NULL;
554	>	}
555	>	diskio_stats_ptr=diskio_stats+num_diskio;
556	>
557	>	diskio_stats_ptr->read_bytes=kios.nread;
558	>	diskio_stats_ptr->write_bytes=kios.nwritten;
559	>	if (sg_update_string(&diskio_stats_ptr->disk_name,
560	>	sg_get_svr_from_bsd(ksp->ks_name)) < 0) {
561	>	return NULL;
562	>	}
563	>	diskio_stats_ptr->systime=time(NULL);
564	>
565	>	num_diskio++;
566	>	}
567	>	}
568	>
569	>	kstat_close(kc);
570	>	#endif
571	>
572	>	#ifdef LINUX
573	>	num_diskio = 0;
574	>	n = 0;
575	>
576	>	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
577	>	have statistics in here too, so we can use those directly.
578	>	2.6 kernels have /proc/diskstats instead with almost (but not quite)
579	>	the same format. */
580	>
581	>	f = fopen("/proc/diskstats", "r");
582	>	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
583	>	if (f == NULL) {
584	>	f = fopen("/proc/partitions", "r");
585	>	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
586	>	}
587	>	if (f == NULL) goto out;
588	>	now = time(NULL);
589	>
590	>	while ((line_ptr = sg_f_read_line(f, "")) != NULL) {
591	>	char name[100];
592	>	char *s;
593	>	long long rsect, wsect;
594	>
595	>	int nr = sscanf(line_ptr, format,
596	>	&major, &minor, name, &rsect, &wsect);
597	>	if (nr < 3) continue;
598	>
599	>	/* Skip device names ending in numbers, since they're
600	>	partitions. */
601	>	s = name;
602	>	while (*s != '\0') s++;
603	>	--s;
604	>	if (*s >= '0' && *s <= '9') continue;
605	>
606	>	if (nr < 5) {
607	>	has_pp_stats = 0;
608	>	rsect = 0;
609	>	wsect = 0;
610	>	}
611	>
612	>	if (VECTOR_RESIZE(diskio_stats, n + 1) < 0) {
613	>	goto out;
614	>	}
615	>	if (VECTOR_RESIZE(parts, n + 1) < 0) {
616	>	goto out;
617	>	}
618	>
619	>	if (sg_update_string(&diskio_stats[n].disk_name, name) < 0) {
620	>	goto out;
621	>	}
622	>	diskio_stats[n].read_bytes = rsect * 512;
623	>	diskio_stats[n].write_bytes = wsect * 512;
624	>	diskio_stats[n].systime = now;
625	>	parts[n].major = major;
626	>	parts[n].minor = minor;
627	>
628	>	n++;
629	>	}
630	>
631	>	fclose(f);
632	>	f = NULL;
633	>
634	>	if (!has_pp_stats) {
635	>	/* This is an older kernel where /proc/partitions doesn't
636	>	contain stats. Read what we can from /proc/stat instead, and
637	>	fill in the appropriate bits of the list allocated above. */
638	>
639	>	f = fopen("/proc/stat", "r");
640	>	if (f == NULL) goto out;
641	>	now = time(NULL);
642	>
643	>	line_ptr = sg_f_read_line(f, "disk_io:");
644	>	if (line_ptr == NULL) goto out;
645	>
646	>	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
647	>	long long rsect, wsect;
648	>
649	>	if (*++line_ptr == '\0') break;
650	>
651	>	if((sscanf(line_ptr,
652	>	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
653	>	&major, &minor, &rsect, &wsect)) != 4) {
654	>	continue;
655	>	}
656	>
657	>	/* Find the corresponding device from earlier.
658	>	Just to add to the fun, "minor" is actually the disk
659	>	number, not the device minor, so we need to figure
660	>	out the real minor number based on the major!
661	>	This list is not exhaustive; if you're running
662	>	an older kernel you probably don't have fancy
663	>	I2O hardware anyway... */
664	>	switch (major) {
665	>	case 3:
666	>	case 21:
667	>	case 22:
668	>	case 33:
669	>	case 34:
670	>	case 36:
671	>	case 56:
672	>	case 57:
673	>	case 88:
674	>	case 89:
675	>	case 90:
676	>	case 91:
677	>	minor *= 64;
678	>	break;
679	>	case 9:
680	>	case 43:
681	>	break;
682	>	default:
683	>	minor *= 16;
684	>	break;
685	>	}
686	>	for (i = 0; i < n; i++) {
687	>	if (major == parts[i].major
688	>	&& minor == parts[i].minor)
689	>	break;
690	>	}
691	>	if (i == n) continue;
692	>
693	>	/* We read the number of blocks. Blocks are stored in
694	>	512 bytes */
695	>	diskio_stats[i].read_bytes = rsect * 512;
696	>	diskio_stats[i].write_bytes = wsect * 512;
697	>	diskio_stats[i].systime = now;
698	>	}
699	>	}
700	>
701	>	num_diskio = n;
702	>	out:
703	>	if (f != NULL) fclose(f);
704	>	#endif
705	>
706	>	#ifdef CYGWIN
707	>	sg_set_error(SG_ERROR_UNSUPPORTED, "Cygwin");
708		return NULL;
709	+	#endif
710	+
711	+	*entries=num_diskio;
712	+
713	+	return diskio_stats;
714		}
715	+
716	+	sg_disk_io_stats *sg_get_disk_io_stats_diff(int *entries){
717	+	VECTOR_DECLARE_STATIC(diff, sg_disk_io_stats, 1,
718	+	diskio_stat_init, diskio_stat_destroy);
719	+	sg_disk_io_stats *src = NULL, *dest;
720	+	int i, j, diff_count, new_count;
721	+
722	+	if (diskio_stats == NULL) {
723	+	/* No previous stats, so we can't calculate a difference. */
724	+	return sg_get_disk_io_stats(entries);
725	+	}
726	+
727	+	/* Resize the results array to match the previous stats. */
728	+	diff_count = VECTOR_SIZE(diskio_stats);
729	+	if (VECTOR_RESIZE(diff, diff_count) < 0) {
730	+	return NULL;
731	+	}
732	+
733	+	/* Copy the previous stats into the result. */
734	+	for (i = 0; i < diff_count; i++) {
735	+	src = &diskio_stats[i];
736	+	dest = &diff[i];
737	+
738	+	if (sg_update_string(&dest->disk_name, src->disk_name) < 0) {
739	+	return NULL;
740	+	}
741	+	dest->read_bytes = src->read_bytes;
742	+	dest->write_bytes = src->write_bytes;
743	+	dest->systime = src->systime;
744	+	}
745	+
746	+	/* Get a new set of stats. */
747	+	if (sg_get_disk_io_stats(&new_count) == NULL) {
748	+	return NULL;
749	+	}
750	+
751	+	/* For each previous stat... */
752	+	for (i = 0; i < diff_count; i++) {
753	+	dest = &diff[i];
754	+
755	+	/* ... find the corresponding new stat ... */
756	+	for (j = 0; j < new_count; j++) {
757	+	/* Try the new stat in the same position first,
758	+	since that's most likely to be it. */
759	+	src = &diskio_stats[(i + j) % new_count];
760	+	if (strcmp(src->disk_name, dest->disk_name) == 0) {
761	+	break;
762	+	}
763	+	}
764	+	if (j == new_count) {
765	+	/* No match found. */
766	+	continue;
767	+	}
768	+
769	+	/* ... and subtract the previous stat from it to get the
770	+	difference. */
771	+	dest->read_bytes = src->read_bytes - dest->read_bytes;
772	+	dest->write_bytes = src->write_bytes - dest->write_bytes;
773	+	dest->systime = src->systime - dest->systime;
774	+	}
775	+
776	+	*entries = diff_count;
777	+	return diff;
778	+	}
779	+
780	+	int sg_disk_io_compare_name(const void *va, const void *vb) {
781	+	const sg_disk_io_stats *a = (const sg_disk_io_stats *)va;
782	+	const sg_disk_io_stats *b = (const sg_disk_io_stats *)vb;
783	+
784	+	return strcmp(a->disk_name, b->disk_name);
785	+	}
786	+

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