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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 1.37 by ats, Sun Oct 19 21:22:09 2003 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
3	>	* http://www.i-scream.org
4	>	* Copyright (C) 2000-2003 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
#	Line 22 | Line 22
22		#include "config.h"
23		#endif
24
25	–	#include "statgrab.h"
26	–	#include <stdlib.h>
25		#include <stdio.h>
26	+	#include <stdlib.h>
27		#include <string.h>
28	+	#include "statgrab.h"
29
30		#ifdef SOLARIS
31		#include <sys/mnttab.h>
32	–	#include <sys/types.h>
32		#include <sys/statvfs.h>
33	<
33	>	#include <kstat.h>
34		#define VALID_FS_TYPES {"ufs", "tmpfs"}
35	+	#endif
36
37	+	#ifdef LINUX
38	+	#include <time.h>
39	+	#include <sys/vfs.h>
40	+	#include <mntent.h>
41	+	#include "tools.h"
42	+	#define VALID_FS_TYPES {"adfs", "affs", "befs", "bfs", "efs", "ext2", \
43	+	"ext3", "vxfs", "hfs", "hfsplus", "hpfs", "jffs", \
44	+	"jffs2", "minix", "msdos", "ntfs", "qnx4", "ramfs", \
45	+	"rootfs", "reiserfs", "sysv", "v7", "udf", "ufs", \
46	+	"umsdos", "vfat", "xfs", "jfs"}
47		#endif
48
49	+	#ifdef ALLBSD
50	+	#include <sys/param.h>
51	+	#include <sys/ucred.h>
52	+	#include <sys/mount.h>
53	+	#endif
54	+	#ifdef FREEBSD
55	+	#include <sys/dkstat.h>
56	+	#include <devstat.h>
57	+	#define VALID_FS_TYPES {"hpfs", "msdosfs", "ntfs", "udf", "ext2fs", \
58	+	"ufs", "mfs"}
59	+	#endif
60	+	#ifdef NETBSD
61	+	#include <sys/param.h>
62	+	#include <sys/sysctl.h>
63	+	#include <sys/disk.h>
64	+	#define VALID_FS_TYPES {"ffs", "mfs", "msdos", "lfs", "adosfs", "ext2fs", \
65	+	"ntfs"}
66	+	#endif
67	+
68		#define START_VAL 1
69
70		char *copy_string(char *orig_ptr, const char *newtext){
#	Line 60 | Line 89 | void init_disk_stat(int start, int end, disk_stat_t *d
89
90		disk_stats++;
91		}
63	–
92		}
93
94		disk_stat_t *get_disk_stats(int *entries){
#	Line 70 | Line 98 | disk_stat_t *get_disk_stats(int *entries){
98
99		char *fs_types[] = VALID_FS_TYPES;
100		int x, valid_type;
73	–
101		int num_disks=0;
102	<	struct mnttab mp;
76	<	struct statvfs fs;
102	>	#if defined(LINUX) || defined (SOLARIS)
103		FILE *f;
104	+	#endif
105
106		disk_stat_t *disk_ptr;
107
108	+	#ifdef SOLARIS
109	+	struct mnttab mp;
110	+	struct statvfs fs;
111	+	#endif
112	+	#ifdef LINUX
113	+	struct mntent *mp;
114	+	struct statfs fs;
115	+	#endif
116	+	#ifdef ALLBSD
117	+	int nummnt;
118	+	struct statfs *mp;
119	+	#endif
120	+
121		if(watermark==-1){
122		disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
123		if(disk_stats==NULL){
#	Line 86 | Line 126 | disk_stat_t *get_disk_stats(int *entries){
126		watermark=START_VAL;
127		init_disk_stat(0, watermark-1, disk_stats);
128		}
129	+	#ifdef ALLBSD
130	+	nummnt=getmntinfo(&mp , MNT_LOCAL);
131	+	if (nummnt<=0){
132	+	return NULL;
133	+	}
134	+	for(;nummnt--; mp++){
135	+	valid_type=0;
136	+	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
137	+	if(strcmp(mp->f_fstypename, fs_types[x]) ==0){
138	+	valid_type=1;
139	+	break;
140	+	}
141	+	}
142	+	#endif
143
144	+	#ifdef LINUX
145	+	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
146	+	return NULL;
147	+	}
148
149	+	while((mp=getmntent(f))){
150	+	if((statfs(mp->mnt_dir, &fs)) !=0){
151	+	continue;
152	+	}
153	+
154	+	valid_type=0;
155	+	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
156	+	if(strcmp(mp->mnt_type, fs_types[x]) ==0){
157	+	valid_type=1;
158	+	break;
159	+	}
160	+	}
161	+	#endif
162	+
163	+	#ifdef SOLARIS
164		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
165		return NULL;
166		}
#	Line 95 | Line 168 | disk_stat_t *get_disk_stats(int *entries){
168		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
169		continue;
170		}
98	–
171		valid_type=0;
172		for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
173		if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
#	Line 103 | Line 175 | disk_stat_t *get_disk_stats(int *entries){
175		break;
176		}
177		}
178	+	#endif
179
180		if(valid_type){
181		if(num_disks>watermark-1){
#	Line 117 | Line 190 | disk_stat_t *get_disk_stats(int *entries){
190		}
191
192		disk_ptr=disk_stats+num_disks;
193	<
193	>	#ifdef ALLBSD
194	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
195	>	return NULL;
196	>	}
197	>
198	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->f_fstypename))==NULL){
199	>	return NULL;
200	>	}
201	>
202	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->f_mntonname))==NULL){
203	>	return NULL;
204	>	}
205	>
206	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
207	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
208	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
209	>
210	>	disk_ptr->total_inodes=(long long)mp->f_files;
211	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
212	>	/* Freebsd doesn't have a "available" inodes */
213	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
214	>	#endif
215	>	#ifdef LINUX
216	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->mnt_fsname))==NULL){
217	>	return NULL;
218	>	}
219	>
220	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->mnt_type))==NULL){
221	>	return NULL;
222	>	}
223	>
224	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->mnt_dir))==NULL){
225	>	return NULL;
226	>	}
227	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
228	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
229	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
230	>
231	>	disk_ptr->total_inodes=(long long)fs.f_files;
232	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
233	>	/* Linux doesn't have a "available" inodes */
234	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
235	>	#endif
236	>
237	>	#ifdef SOLARIS
238		/* Memory leak in event of realloc failing */
239		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
240	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
241	<	of a k each */
240	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
241	>	* be upwards of a k each
242	>	*/
243		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
244		return NULL;
245		}
#	Line 141 | Line 259 | disk_stat_t *get_disk_stats(int *entries){
259		disk_ptr->total_inodes=(long long)fs.f_files;
260		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
261		disk_ptr->free_inodes=(long long)fs.f_favail;
262	<
262	>	#endif
263		num_disks++;
264		}
265		}
#	Line 149 | Line 267 | disk_stat_t *get_disk_stats(int *entries){
267		*entries=num_disks;
268
269		/* If this fails, there is very little i can do about it, so i'll ignore it :) */
270	+	#if defined(LINUX) || defined(SOLARIS)
271		fclose(f);
272	+	#endif
273
274		return disk_stats;
275
276		}
277	+	void diskio_stat_init(int start, int end, diskio_stat_t *diskio_stats){
278
279	+	for(diskio_stats+=start; start<end; start++){
280	+	diskio_stats->disk_name=NULL;
281	+
282	+	diskio_stats++;
283	+	}
284	+	}
285	+
286	+	diskio_stat_t *diskio_stat_malloc(int needed_entries, int *cur_entries, diskio_stat_t *diskio_stats){
287	+
288	+	if(diskio_stats==NULL){
289	+
290	+	if((diskio_stats=malloc(needed_entries * sizeof(diskio_stat_t)))==NULL){
291	+	return NULL;
292	+	}
293	+	diskio_stat_init(0, needed_entries, diskio_stats);
294	+	*cur_entries=needed_entries;
295	+
296	+	return diskio_stats;
297	+	}
298	+
299	+
300	+	if(*cur_entries<needed_entries){
301	+	diskio_stats=realloc(diskio_stats, (sizeof(diskio_stat_t)*needed_entries));
302	+	if(diskio_stats==NULL){
303	+	return NULL;
304	+	}
305	+	diskio_stat_init(*cur_entries, needed_entries, diskio_stats);
306	+	*cur_entries=needed_entries;
307	+	}
308	+
309	+	return diskio_stats;
310	+	}
311	+
312	+	static diskio_stat_t *diskio_stats=NULL;
313	+	static int num_diskio=0;
314	+
315	+	#ifdef LINUX
316	+	typedef struct {
317	+	int major;
318	+	int minor;
319	+	} partition;
320	+	#endif
321	+
322		diskio_stat_t *get_diskio_stats(int *entries){
323
324	<	/* Do jibble */
325	<	return NULL;
324	>	static int sizeof_diskio_stats=0;
325	>	diskio_stat_t *diskio_stats_ptr;
326	>
327	>	#ifdef SOLARIS
328	>	kstat_ctl_t *kc;
329	>	kstat_t *ksp;
330	>	kstat_io_t kios;
331	>	#endif
332	>	#ifdef LINUX
333	>	FILE *f;
334	>	char *line_ptr;
335	>	int major, minor;
336	>	char dev_letter;
337	>	int has_pp_stats = 1;
338	>	static partition *parts = NULL;
339	>	static int alloc_parts = 0;
340	>	int i, n;
341	>	time_t now;
342	>	#endif
343	>	#ifdef FREEBSD
344	>	static struct statinfo stats;
345	>	static int stats_init = 0;
346	>	int counter;
347	>	struct device_selection *dev_sel = NULL;
348	>	int n_selected, n_selections;
349	>	long sel_gen;
350	>	struct devstat *dev_ptr;
351	>	#endif
352	>	#ifdef NETBSD
353	>	struct disk_sysctl *stats;
354	>	int num_disks, i;
355	>	int mib[3];
356	>	size_t size;
357	>	#endif
358	>
359	>	num_diskio=0;
360	>
361	>	#ifdef NETBSD
362	>	mib[0] = CTL_HW;
363	>	mib[1] = HW_DISKSTATS;
364	>	mib[2] = sizeof(struct disk_sysctl);
365	>
366	>	if (sysctl(mib, 3, NULL, &size, NULL, 0) < 0) {
367	>	return NULL;
368	>	}
369	>	num_disks = size / sizeof(struct disk_sysctl);
370	>
371	>	stats = malloc(size);
372	>	if (stats == NULL) {
373	>	return NULL;
374	>	}
375	>
376	>	if (sysctl(mib, 3, stats, &size, NULL, 0) < 0) {
377	>	return NULL;
378	>	}
379	>
380	>	for (i = 0; i < num_disks; i++) {
381	>	u_int64_t rbytes, wbytes;
382	>
383	>	#ifdef HAVE_DK_RBYTES
384	>	rbytes = stats[i].dk_rbytes;
385	>	wbytes = stats[i].dk_wbytes;
386	>	#else
387	>	/* Before 1.7, NetBSD merged reads and writes. */
388	>	rbytes = wbytes = stats[i].dk_bytes;
389	>	#endif
390	>
391	>	/* Don't keep stats for disks that have never been used. */
392	>	if (rbytes == 0 && wbytes == 0) {
393	>	continue;
394	>	}
395	>
396	>	diskio_stats = diskio_stat_malloc(num_diskio + 1,
397	>	&sizeof_diskio_stats,
398	>	diskio_stats);
399	>	if (diskio_stats == NULL) {
400	>	return NULL;
401	>	}
402	>	diskio_stats_ptr = diskio_stats + num_diskio;
403	>
404	>	diskio_stats_ptr->read_bytes = rbytes;
405	>	diskio_stats_ptr->write_bytes = wbytes;
406	>	if (diskio_stats_ptr->disk_name != NULL) {
407	>	free(diskio_stats_ptr->disk_name);
408	>	}
409	>	diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
410	>	diskio_stats_ptr->systime = time(NULL);
411	>
412	>	num_diskio++;
413	>	}
414	>
415	>	free(stats);
416	>	#endif
417	>
418	>	#ifdef FREEBSD
419	>	if (!stats_init) {
420	>	stats.dinfo=malloc(sizeof(struct devinfo));
421	>	if(stats.dinfo==NULL) return NULL;
422	>	bzero(stats.dinfo, sizeof(struct devinfo));
423	>	stats_init = 1;
424	>	}
425	>	#ifdef FREEBSD5
426	>	if ((devstat_getdevs(NULL, &stats)) < 0) return NULL;
427	>	/* Not aware of a get all devices, so i said 999. If we ever
428	>	* find a machine with more than 999 disks, then i'll change
429	>	* this number :)
430	>	*/
431	>	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;
432	>	#else
433	>	if ((getdevs(&stats)) < 0) return NULL;
434	>	/* Not aware of a get all devices, so i said 999. If we ever
435	>	* find a machine with more than 999 disks, then i'll change
436	>	* this number :)
437	>	*/
438	>	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;
439	>	#endif
440	>
441	>	for(counter=0;counter<stats.dinfo->numdevs;counter++){
442	>	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
443	>
444	>	/* Throw away devices that have done nothing, ever.. Eg "odd"
445	>	* devices.. like mem, proc.. and also doesn't report floppy
446	>	* drives etc unless they are doing stuff :)
447	>	*/
448	>	#ifdef FREEBSD5
449	>	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
450	>	#else
451	>	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
452	>	#endif
453	>	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
454	>	return NULL;
455	>	}
456	>	diskio_stats_ptr=diskio_stats+num_diskio;
457	>
458	>	#ifdef FREEBSD5
459	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
460	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
461	>	#else
462	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
463	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
464	>	#endif
465	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
466	>	asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number);
467	>	diskio_stats_ptr->systime=time(NULL);
468	>
469	>	num_diskio++;
470	>	}
471	>	free(dev_sel);
472	>
473	>	#endif
474	>	#ifdef SOLARIS
475	>	if ((kc = kstat_open()) == NULL) {
476	>	return NULL;
477	>	}
478	>
479	>	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
480	>	if (!strcmp(ksp->ks_class, "disk")) {
481	>
482	>	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
483	>	/* We dont want metadevices appearins as num_diskio */
484	>	if(strcmp(ksp->ks_module, "md")==0) continue;
485	>	if((kstat_read(kc, ksp, &kios))==-1){
486	>	}
487	>
488	>	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
489	>	kstat_close(kc);
490	>	return NULL;
491	>	}
492	>	diskio_stats_ptr=diskio_stats+num_diskio;
493	>
494	>	diskio_stats_ptr->read_bytes=kios.nread;
495	>
496	>	diskio_stats_ptr->write_bytes=kios.nwritten;
497	>
498	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
499	>
500	>	diskio_stats_ptr->disk_name=strdup(ksp->ks_name);
501	>	diskio_stats_ptr->systime=time(NULL);
502	>	num_diskio++;
503	>	}
504	>	}
505	>
506	>	kstat_close(kc);
507	>	#endif
508	>
509	>	#ifdef LINUX
510	>	num_diskio = 0;
511	>	n = 0;
512	>
513	>	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
514	>	have statistics in here too, so we can use those directly. */
515	>
516	>	f = fopen("/proc/partitions", "r");
517	>	if (f == NULL) goto out;
518	>	now = time(NULL);
519	>
520	>	while ((line_ptr = f_read_line(f, "")) != NULL) {
521	>	char name[20];
522	>	char *s;
523	>	long long rsect, wsect;
524	>
525	>	int nr = sscanf(line_ptr,
526	>	" %d %d %*d %19s %*d %*d %lld %*d %*d %*d %lld",
527	>	&major, &minor, name, &rsect, &wsect);
528	>	if (nr < 3) continue;
529	>	if (nr < 5) {
530	>	has_pp_stats = 0;
531	>	rsect = 0;
532	>	wsect = 0;
533	>	}
534	>
535	>	/* Skip device names ending in numbers, since they're
536	>	partitions. */
537	>	s = name;
538	>	while (*s != '\0') s++;
539	>	--s;
540	>	if (*s >= '0' && *s <= '9') continue;
541	>
542	>	diskio_stats = diskio_stat_malloc(n + 1, &sizeof_diskio_stats,
543	>	diskio_stats);
544	>	if (diskio_stats == NULL) goto out;
545	>	if (n >= alloc_parts) {
546	>	alloc_parts += 16;
547	>	parts = realloc(parts, alloc_parts * sizeof *parts);
548	>	if (parts == NULL) {
549	>	alloc_parts = 0;
550	>	goto out;
551	>	}
552	>	}
553	>
554	>	if (diskio_stats[n].disk_name != NULL)
555	>	free(diskio_stats[n].disk_name);
556	>	diskio_stats[n].disk_name = strdup(name);
557	>	diskio_stats[n].read_bytes = rsect * 512;
558	>	diskio_stats[n].write_bytes = wsect * 512;
559	>	diskio_stats[n].systime = now;
560	>	parts[n].major = major;
561	>	parts[n].minor = minor;
562	>
563	>	n++;
564	>	}
565	>
566	>	if (!has_pp_stats) {
567	>	/* This is an older kernel without stats in /proc/partitions.
568	>	Read what we can from /proc/stat instead. */
569	>
570	>	f = fopen("/proc/stat", "r");
571	>	if (f == NULL) goto out;
572	>	now = time(NULL);
573	>
574	>	line_ptr = f_read_line(f, "disk_io:");
575	>	if (line_ptr == NULL) goto out;
576	>
577	>	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
578	>	long long rsect, wsect;
579	>
580	>	if (*++line_ptr == '\0') break;
581	>
582	>	if((sscanf(line_ptr,
583	>	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
584	>	&major, &minor, &rsect, &wsect)) != 4) {
585	>	continue;
586	>	}
587	>
588	>	/* Find the corresponding device from earlier.
589	>	Just to add to the fun, "minor" is actually the disk
590	>	number, not the device minor, so we need to figure
591	>	out the real minor number based on the major!
592	>	This list is not exhaustive; if you're running
593	>	an older kernel you probably don't have fancy
594	>	I2O hardware anyway... */
595	>	switch (major) {
596	>	case 3:
597	>	case 21:
598	>	case 22:
599	>	case 33:
600	>	case 34:
601	>	case 36:
602	>	case 56:
603	>	case 57:
604	>	case 88:
605	>	case 89:
606	>	case 90:
607	>	case 91:
608	>	minor *= 64;
609	>	break;
610	>	case 9:
611	>	case 43:
612	>	break;
613	>	default:
614	>	minor *= 16;
615	>	break;
616	>	}
617	>	for (i = 0; i < n; i++) {
618	>	if (major == parts[i].major
619	>	&& minor == parts[i].minor)
620	>	break;
621	>	}
622	>	if (i == n) continue;
623	>
624	>	/* We read the number of blocks. Blocks are stored in
625	>	512 bytes */
626	>	diskio_stats[i].read_bytes = rsect * 512;
627	>	diskio_stats[i].write_bytes = wsect * 512;
628	>	diskio_stats[i].systime = now;
629	>	}
630	>	}
631	>
632	>	num_diskio = n;
633	>	out:
634	>	if (f != NULL) fclose(f);
635	>
636	>	#endif
637	>	*entries=num_diskio;
638	>
639	>	return diskio_stats;
640	>	}
641	>
642	>	diskio_stat_t *get_diskio_stats_diff(int *entries){
643	>	static diskio_stat_t *diskio_stats_diff=NULL;
644	>	static int sizeof_diskio_stats_diff=0;
645	>	diskio_stat_t *diskio_stats_diff_ptr, *diskio_stats_ptr;
646	>	int disks, x, y;
647	>
648	>	if(diskio_stats==NULL){
649	>	diskio_stats_ptr=get_diskio_stats(&disks);
650	>	*entries=disks;
651	>	return diskio_stats_ptr;
652	>	}
653	>
654	>	diskio_stats_diff=diskio_stat_malloc(num_diskio, &sizeof_diskio_stats_diff, diskio_stats_diff);
655	>	if(diskio_stats_diff==NULL){
656	>	return NULL;
657	>	}
658	>
659	>	diskio_stats_diff_ptr=diskio_stats_diff;
660	>	diskio_stats_ptr=diskio_stats;
661	>
662	>	for(disks=0;disks<num_diskio;disks++){
663	>	if(diskio_stats_diff_ptr->disk_name!=NULL){
664	>	free(diskio_stats_diff_ptr->disk_name);
665	>	}
666	>	diskio_stats_diff_ptr->disk_name=strdup(diskio_stats_ptr->disk_name);
667	>	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes;
668	>	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes;
669	>	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime;
670	>
671	>	diskio_stats_diff_ptr++;
672	>	diskio_stats_ptr++;
673	>	}
674	>
675	>	diskio_stats_ptr=get_diskio_stats(&disks);
676	>	diskio_stats_diff_ptr=diskio_stats_diff;
677	>
678	>	for(x=0;x<sizeof_diskio_stats_diff;x++){
679	>
680	>	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
681	>	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
682	>	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
683	>	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
684	>	}else{
685	>	diskio_stats_ptr=diskio_stats;
686	>	for(y=0;y<disks;y++){
687	>	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
688	>	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
689	>	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
690	>	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
691	>
692	>	break;
693	>	}
694	>
695	>	diskio_stats_ptr++;
696	>	}
697	>	}
698	>
699	>	diskio_stats_ptr++;
700	>	diskio_stats_diff_ptr++;
701	>
702	>	}
703	>
704	>	*entries=sizeof_diskio_stats_diff;
705	>	return diskio_stats_diff;
706		}

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