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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 1.8 by pajs, Sat Mar 1 02:41:54 2003 UTC vs.
Revision 1.48 by tdb, Fri Jan 16 15:54:54 2004 UTC

#	Line 1 | Line 1
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) 2000-2004 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
22		#ifdef HAVE_CONFIG_H
23		#include "config.h"
24		#endif
25
25	–	#include <stdlib.h>
26		#include <stdio.h>
27	+	#include <stdlib.h>
28		#include <string.h>
29	+	#include <time.h>
30		#include "statgrab.h"
31
32		#ifdef SOLARIS
#	Line 34 | Line 36
36		#define VALID_FS_TYPES {"ufs", "tmpfs"}
37		#endif
38
39	+	#if defined(LINUX) || defined(CYGWIN)
40	+	#include <mntent.h>
41	+	#include <sys/vfs.h>
42	+	#include "tools.h"
43	+	#endif
44	+
45	+	#ifdef LINUX
46	+	#define VALID_FS_TYPES {"adfs", "affs", "befs", "bfs", "efs", "ext2", \
47	+	"ext3", "vxfs", "hfs", "hfsplus", "hpfs", "jffs", \
48	+	"jffs2", "minix", "msdos", "ntfs", "qnx4", "ramfs", \
49	+	"rootfs", "reiserfs", "sysv", "v7", "udf", "ufs", \
50	+	"umsdos", "vfat", "xfs", "jfs"}
51	+	#endif
52	+
53	+	#ifdef CYGWIN
54	+	#define VALID_FS_TYPES {"user"}
55	+	#endif
56	+
57	+	#ifdef ALLBSD
58	+	#include <sys/param.h>
59	+	#include <sys/ucred.h>
60	+	#include <sys/mount.h>
61	+	#endif
62	+	#ifdef FREEBSD
63	+	#include <sys/dkstat.h>
64	+	#include <devstat.h>
65	+	#define VALID_FS_TYPES {"hpfs", "msdosfs", "ntfs", "udf", "ext2fs", \
66	+	"ufs", "mfs"}
67	+	#endif
68	+	#ifdef NETBSD
69	+	#include <sys/param.h>
70	+	#include <sys/sysctl.h>
71	+	#include <sys/disk.h>
72	+	#define VALID_FS_TYPES {"ffs", "mfs", "msdos", "lfs", "adosfs", "ext2fs", \
73	+	"ntfs"}
74	+	#endif
75	+
76		#define START_VAL 1
77
78		char *copy_string(char *orig_ptr, const char *newtext){
#	Line 60 | Line 99 | void init_disk_stat(int start, int end, disk_stat_t *d
99		}
100		}
101
102	+	int is_valid_fs_type(const char *type) {
103	+	const char *types[] = VALID_FS_TYPES;
104	+	int i;
105	+
106	+	for (i = 0; i < (sizeof types / sizeof *types); i++) {
107	+	if (strcmp(types[i], type) == 0) {
108	+	return 1;
109	+	}
110	+	}
111	+	return 0;
112	+	}
113	+
114		disk_stat_t *get_disk_stats(int *entries){
115
116		static disk_stat_t *disk_stats;
117		static int watermark=-1;
118
119	<	char *fs_types[] = VALID_FS_TYPES;
69	<	int x, valid_type;
70	<
119	>	int valid_type;
120		int num_disks=0;
121	<	struct mnttab mp;
73	<	struct statvfs fs;
121	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
122		FILE *f;
123	+	#endif
124
125		disk_stat_t *disk_ptr;
126
127	+	#ifdef SOLARIS
128	+	struct mnttab mp;
129	+	struct statvfs fs;
130	+	#endif
131	+	#if defined(LINUX) || defined(CYGWIN)
132	+	struct mntent *mp;
133	+	struct statfs fs;
134	+	#endif
135	+	#ifdef ALLBSD
136	+	int nummnt;
137	+	struct statfs *mp;
138	+	#endif
139	+
140		if(watermark==-1){
141		disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
142		if(disk_stats==NULL){
#	Line 83 | Line 145 | disk_stat_t *get_disk_stats(int *entries){
145		watermark=START_VAL;
146		init_disk_stat(0, watermark-1, disk_stats);
147		}
148	+	#ifdef ALLBSD
149	+	nummnt=getmntinfo(&mp , MNT_LOCAL);
150	+	if (nummnt<=0){
151	+	return NULL;
152	+	}
153	+	for(;nummnt--; mp++){
154	+	valid_type = is_valid_fs_type(mp->f_fstypename);
155	+	#endif
156
157	+	#if defined(LINUX) || defined(CYGWIN)
158	+	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
159	+	return NULL;
160	+	}
161
162	+	while((mp=getmntent(f))){
163	+	if((statfs(mp->mnt_dir, &fs)) !=0){
164	+	continue;
165	+	}
166	+
167	+	valid_type = is_valid_fs_type(mp->mnt_type);
168	+	#endif
169	+
170	+	#ifdef SOLARIS
171		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
172		return NULL;
173		}
#	Line 92 | Line 175 | disk_stat_t *get_disk_stats(int *entries){
175		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
176		continue;
177		}
178	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
179	+	#endif
180
96	–	valid_type=0;
97	–	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
98	–	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
99	–	valid_type=1;
100	–	break;
101	–	}
102	–	}
103	–
181		if(valid_type){
182		if(num_disks>watermark-1){
183		disk_ptr=disk_stats;
#	Line 114 | Line 191 | disk_stat_t *get_disk_stats(int *entries){
191		}
192
193		disk_ptr=disk_stats+num_disks;
194	<
194	>	#ifdef ALLBSD
195	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
196	>	return NULL;
197	>	}
198	>
199	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->f_fstypename))==NULL){
200	>	return NULL;
201	>	}
202	>
203	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->f_mntonname))==NULL){
204	>	return NULL;
205	>	}
206	>
207	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
208	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
209	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
210	>
211	>	disk_ptr->total_inodes=(long long)mp->f_files;
212	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
213	>	/* Freebsd doesn't have a "available" inodes */
214	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
215	>	#endif
216	>	#if defined(LINUX) || defined(CYGWIN)
217	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->mnt_fsname))==NULL){
218	>	return NULL;
219	>	}
220	>
221	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->mnt_type))==NULL){
222	>	return NULL;
223	>	}
224	>
225	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->mnt_dir))==NULL){
226	>	return NULL;
227	>	}
228	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
229	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
230	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
231	>
232	>	disk_ptr->total_inodes=(long long)fs.f_files;
233	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
234	>	/* Linux doesn't have a "available" inodes */
235	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
236	>	#endif
237	>
238	>	#ifdef SOLARIS
239		/* Memory leak in event of realloc failing */
240		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
241	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
242	<	of a k each */
241	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
242	>	* be upwards of a k each
243	>	*/
244		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
245		return NULL;
246		}
#	Line 138 | Line 260 | disk_stat_t *get_disk_stats(int *entries){
260		disk_ptr->total_inodes=(long long)fs.f_files;
261		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
262		disk_ptr->free_inodes=(long long)fs.f_favail;
263	<
263	>	#endif
264		num_disks++;
265		}
266		}
267
268		*entries=num_disks;
269
270	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
270	>	/* If this fails, there is very little i can do about it, so
271	>	I'll ignore it :) */
272	>	#if defined(LINUX) || defined(CYGWIN)
273	>	endmntent(f);
274	>	#endif
275	>	#if defined(SOLARIS)
276		fclose(f);
277	+	#endif
278
279		return disk_stats;
280
281		}
154	–
282		void diskio_stat_init(int start, int end, diskio_stat_t *diskio_stats){
283
284		for(diskio_stats+=start; start<end; start++){
#	Line 190 | Line 317 | diskio_stat_t *diskio_stat_malloc(int needed_entries,
317		static diskio_stat_t *diskio_stats=NULL;
318		static int num_diskio=0;
319
320	+	#ifdef LINUX
321	+	typedef struct {
322	+	int major;
323	+	int minor;
324	+	} partition;
325	+	#endif
326	+
327		diskio_stat_t *get_diskio_stats(int *entries){
328
329		static int sizeof_diskio_stats=0;
330	+	#ifndef LINUX
331		diskio_stat_t *diskio_stats_ptr;
332	+	#endif
333
334	+	#ifdef SOLARIS
335		kstat_ctl_t *kc;
336		kstat_t *ksp;
337		kstat_io_t kios;
338	+	#endif
339	+	#ifdef LINUX
340	+	FILE *f;
341	+	char *line_ptr;
342	+	int major, minor;
343	+	int has_pp_stats = 1;
344	+	static partition *parts = NULL;
345	+	static int alloc_parts = 0;
346	+	int i, n;
347	+	time_t now;
348	+	const char *format;
349	+	#endif
350	+	#ifdef FREEBSD
351	+	static struct statinfo stats;
352	+	static int stats_init = 0;
353	+	int counter;
354	+	struct device_selection *dev_sel = NULL;
355	+	int n_selected, n_selections;
356	+	long sel_gen;
357	+	struct devstat *dev_ptr;
358	+	#endif
359	+	#ifdef NETBSD
360	+	struct disk_sysctl *stats;
361	+	int num_disks, i;
362	+	int mib[3];
363	+	size_t size;
364	+	#endif
365
366	+	num_diskio=0;
367	+
368	+	#ifdef NETBSD
369	+	mib[0] = CTL_HW;
370	+	mib[1] = HW_DISKSTATS;
371	+	mib[2] = sizeof(struct disk_sysctl);
372	+
373	+	if (sysctl(mib, 3, NULL, &size, NULL, 0) < 0) {
374	+	return NULL;
375	+	}
376	+	num_disks = size / sizeof(struct disk_sysctl);
377	+
378	+	stats = malloc(size);
379	+	if (stats == NULL) {
380	+	return NULL;
381	+	}
382	+
383	+	if (sysctl(mib, 3, stats, &size, NULL, 0) < 0) {
384	+	return NULL;
385	+	}
386	+
387	+	for (i = 0; i < num_disks; i++) {
388	+	u_int64_t rbytes, wbytes;
389	+
390	+	#ifdef HAVE_DK_RBYTES
391	+	rbytes = stats[i].dk_rbytes;
392	+	wbytes = stats[i].dk_wbytes;
393	+	#else
394	+	/* Before 1.7, NetBSD merged reads and writes. */
395	+	rbytes = wbytes = stats[i].dk_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	+	diskio_stats = diskio_stat_malloc(num_diskio + 1,
404	+	&sizeof_diskio_stats,
405	+	diskio_stats);
406	+	if (diskio_stats == NULL) {
407	+	return NULL;
408	+	}
409	+	diskio_stats_ptr = diskio_stats + num_diskio;
410	+
411	+	diskio_stats_ptr->read_bytes = rbytes;
412	+	diskio_stats_ptr->write_bytes = wbytes;
413	+	if (diskio_stats_ptr->disk_name != NULL) {
414	+	free(diskio_stats_ptr->disk_name);
415	+	}
416	+	diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
417	+	diskio_stats_ptr->systime = time(NULL);
418	+
419	+	num_diskio++;
420	+	}
421	+
422	+	free(stats);
423	+	#endif
424	+
425	+	#ifdef FREEBSD
426	+	if (!stats_init) {
427	+	stats.dinfo=malloc(sizeof(struct devinfo));
428	+	if(stats.dinfo==NULL) return NULL;
429	+	bzero(stats.dinfo, sizeof(struct devinfo));
430	+	stats_init = 1;
431	+	}
432	+	#ifdef FREEBSD5
433	+	if ((devstat_getdevs(NULL, &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 (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;
439	+	#else
440	+	if ((getdevs(&stats)) < 0) return NULL;
441	+	/* Not aware of a get all devices, so i said 999. If we ever
442	+	* find a machine with more than 999 disks, then i'll change
443	+	* this number :)
444	+	*/
445	+	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;
446	+	#endif
447	+
448	+	for(counter=0;counter<stats.dinfo->numdevs;counter++){
449	+	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
450	+
451	+	/* Throw away devices that have done nothing, ever.. Eg "odd"
452	+	* devices.. like mem, proc.. and also doesn't report floppy
453	+	* drives etc unless they are doing stuff :)
454	+	*/
455	+	#ifdef FREEBSD5
456	+	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
457	+	#else
458	+	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
459	+	#endif
460	+	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
461	+	return NULL;
462	+	}
463	+	diskio_stats_ptr=diskio_stats+num_diskio;
464	+
465	+	#ifdef FREEBSD5
466	+	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
467	+	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
468	+	#else
469	+	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
470	+	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
471	+	#endif
472	+	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
473	+	asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number);
474	+	diskio_stats_ptr->systime=time(NULL);
475	+
476	+	num_diskio++;
477	+	}
478	+	free(dev_sel);
479	+
480	+	#endif
481	+	#ifdef SOLARIS
482		if ((kc = kstat_open()) == NULL) {
483		return NULL;
484		}
485
206	–	num_diskio=0;
207	–
486		for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
487		if (!strcmp(ksp->ks_class, "disk")) {
488
#	Line 226 | Line 504 | diskio_stat_t *get_diskio_stats(int *entries){
504
505		if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
506
507	<	diskio_stats_ptr->disk_name=strdup(ksp->ks_name);
507	>	diskio_stats_ptr->disk_name=strdup((char *) get_svr_from_bsd(ksp->ks_name));
508	>	diskio_stats_ptr->systime=time(NULL);
509		num_diskio++;
510		}
511		}
512
513		kstat_close(kc);
514	+	#endif
515
516	+	#ifdef LINUX
517	+	num_diskio = 0;
518	+	n = 0;
519	+
520	+	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
521	+	have statistics in here too, so we can use those directly.
522	+	2.6 kernels have /proc/diskstats instead with almost (but not quite)
523	+	the same format. */
524	+
525	+	f = fopen("/proc/diskstats", "r");
526	+	format = " %d %d %19s %*d %*d %lld %*d %*d %*d %lld";
527	+	if (f == NULL) {
528	+	f = fopen("/proc/partitions", "r");
529	+	format = " %d %d %*d %19s %*d %*d %lld %*d %*d %*d %lld";
530	+	}
531	+	if (f == NULL) goto out;
532	+	now = time(NULL);
533	+
534	+	while ((line_ptr = f_read_line(f, "")) != NULL) {
535	+	char name[20];
536	+	char *s;
537	+	long long rsect, wsect;
538	+
539	+	int nr = sscanf(line_ptr, format,
540	+	&major, &minor, name, &rsect, &wsect);
541	+	if (nr < 3) continue;
542	+
543	+	/* Skip device names ending in numbers, since they're
544	+	partitions. */
545	+	s = name;
546	+	while (*s != '\0') s++;
547	+	--s;
548	+	if (*s >= '0' && *s <= '9') continue;
549	+
550	+	if (nr < 5) {
551	+	has_pp_stats = 0;
552	+	rsect = 0;
553	+	wsect = 0;
554	+	}
555	+
556	+	diskio_stats = diskio_stat_malloc(n + 1, &sizeof_diskio_stats,
557	+	diskio_stats);
558	+	if (diskio_stats == NULL) goto out;
559	+	if (n >= alloc_parts) {
560	+	alloc_parts += 16;
561	+	parts = realloc(parts, alloc_parts * sizeof *parts);
562	+	if (parts == NULL) {
563	+	alloc_parts = 0;
564	+	goto out;
565	+	}
566	+	}
567	+
568	+	if (diskio_stats[n].disk_name != NULL)
569	+	free(diskio_stats[n].disk_name);
570	+	diskio_stats[n].disk_name = strdup(name);
571	+	diskio_stats[n].read_bytes = rsect * 512;
572	+	diskio_stats[n].write_bytes = wsect * 512;
573	+	diskio_stats[n].systime = now;
574	+	parts[n].major = major;
575	+	parts[n].minor = minor;
576	+
577	+	n++;
578	+	}
579	+
580	+	fclose(f);
581	+	f = NULL;
582	+
583	+	if (!has_pp_stats) {
584	+	/* This is an older kernel where /proc/partitions doesn't
585	+	contain stats. Read what we can from /proc/stat instead, and
586	+	fill in the appropriate bits of the list allocated above. */
587	+
588	+	f = fopen("/proc/stat", "r");
589	+	if (f == NULL) goto out;
590	+	now = time(NULL);
591	+
592	+	line_ptr = f_read_line(f, "disk_io:");
593	+	if (line_ptr == NULL) goto out;
594	+
595	+	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
596	+	long long rsect, wsect;
597	+
598	+	if (*++line_ptr == '\0') break;
599	+
600	+	if((sscanf(line_ptr,
601	+	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
602	+	&major, &minor, &rsect, &wsect)) != 4) {
603	+	continue;
604	+	}
605	+
606	+	/* Find the corresponding device from earlier.
607	+	Just to add to the fun, "minor" is actually the disk
608	+	number, not the device minor, so we need to figure
609	+	out the real minor number based on the major!
610	+	This list is not exhaustive; if you're running
611	+	an older kernel you probably don't have fancy
612	+	I2O hardware anyway... */
613	+	switch (major) {
614	+	case 3:
615	+	case 21:
616	+	case 22:
617	+	case 33:
618	+	case 34:
619	+	case 36:
620	+	case 56:
621	+	case 57:
622	+	case 88:
623	+	case 89:
624	+	case 90:
625	+	case 91:
626	+	minor *= 64;
627	+	break;
628	+	case 9:
629	+	case 43:
630	+	break;
631	+	default:
632	+	minor *= 16;
633	+	break;
634	+	}
635	+	for (i = 0; i < n; i++) {
636	+	if (major == parts[i].major
637	+	&& minor == parts[i].minor)
638	+	break;
639	+	}
640	+	if (i == n) continue;
641	+
642	+	/* We read the number of blocks. Blocks are stored in
643	+	512 bytes */
644	+	diskio_stats[i].read_bytes = rsect * 512;
645	+	diskio_stats[i].write_bytes = wsect * 512;
646	+	diskio_stats[i].systime = now;
647	+	}
648	+	}
649	+
650	+	num_diskio = n;
651	+	out:
652	+	if (f != NULL) fclose(f);
653	+	#endif
654	+
655	+	#ifdef CYGWIN
656	+	return NULL;
657	+	#endif
658	+
659		*entries=num_diskio;
660
661		return diskio_stats;
#	Line 272 | Line 695 | diskio_stat_t *get_diskio_stats_diff(int *entries){
695		}
696
697		diskio_stats_ptr=get_diskio_stats(&disks);
698	+	if (diskio_stats_ptr == NULL) {
699	+	return NULL;
700	+	}
701		diskio_stats_diff_ptr=diskio_stats_diff;
702
703		for(x=0;x<sizeof_diskio_stats_diff;x++){

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