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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 1.19 by ats, Thu Aug 28 21:33:42 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
4	<	* Copyright (C) 2000-2003 i-scream
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
#	Line 25 | Line 26
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	<	#ifdef LINUX
38	<	#include <sys/vfs.h>
39	>	#if defined(LINUX) || defined(CYGWIN)
40		#include <mntent.h>
41	+	#include <sys/vfs.h>
42		#include "tools.h"
41	–	#define VALID_FS_TYPES {"ext2", "ext3", "xfs", "reiserfs", "vfat", "tmpfs"}
43		#endif
44
45	<	#ifdef FREEBSD
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 {"ufs", "mfs"}
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 75 | 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;
84	<	int x, valid_type;
119	>	int valid_type;
120		int num_disks=0;
121	<	#if defined(LINUX) || defined (SOLARIS)
121	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
122		FILE *f;
123		#endif
124
#	Line 93 | Line 128 | disk_stat_t *get_disk_stats(int *entries){
128		struct mnttab mp;
129		struct statvfs fs;
130		#endif
131	<	#ifdef LINUX
131	>	#if defined(LINUX) || defined(CYGWIN)
132		struct mntent *mp;
133		struct statfs fs;
134		#endif
135	<	#ifdef FREEBSD
135	>	#ifdef ALLBSD
136		int nummnt;
137		struct statfs *mp;
138		#endif
#	Line 110 | 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 FREEBSD
148	>	#ifdef ALLBSD
149		nummnt=getmntinfo(&mp , MNT_LOCAL);
150		if (nummnt<=0){
151		return NULL;
152		}
153		for(;nummnt--; mp++){
154	<	valid_type=0;
120	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
121	<	if(strcmp(mp->f_fstypename, fs_types[x]) ==0){
122	<	valid_type=1;
123	<	break;
124	<	}
125	<	}
154	>	valid_type = is_valid_fs_type(mp->f_fstypename);
155		#endif
156
157	<	#ifdef LINUX
157	>	#if defined(LINUX) || defined(CYGWIN)
158		if ((f=setmntent("/etc/mtab", "r" ))==NULL){
159		return NULL;
160		}
#	Line 135 | Line 164 | disk_stat_t *get_disk_stats(int *entries){
164		continue;
165		}
166
167	<	valid_type=0;
139	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
140	<	if(strcmp(mp->mnt_type, fs_types[x]) ==0){
141	<	valid_type=1;
142	<	break;
143	<	}
144	<	}
167	>	valid_type = is_valid_fs_type(mp->mnt_type);
168		#endif
169
170		#ifdef SOLARIS
#	Line 152 | Line 175 | disk_stat_t *get_disk_stats(int *entries){
175		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
176		continue;
177		}
178	<	valid_type=0;
156	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
157	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
158	<	valid_type=1;
159	<	break;
160	<	}
161	<	}
178	>	valid_type = is_valid_fs_type(mp.mnt_fstype);
179		#endif
180
181		if(valid_type){
#	Line 174 | Line 191 | disk_stat_t *get_disk_stats(int *entries){
191		}
192
193		disk_ptr=disk_stats+num_disks;
194	<	#ifdef FREEBSD
194	>	#ifdef ALLBSD
195		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
196		return NULL;
197		}
#	Line 196 | Line 213 | disk_stat_t *get_disk_stats(int *entries){
213		/* Freebsd doesn't have a "available" inodes */
214		disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
215		#endif
216	<	#ifdef LINUX
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		}
#	Line 250 | Line 267 | disk_stat_t *get_disk_stats(int *entries){
267
268		*entries=num_disks;
269
270	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
271	<	#if defined(LINUX) || defined(SOLARIS)
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
#	Line 296 | 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;
#	Line 310 | Line 340 | diskio_stat_t *get_diskio_stats(int *entries){
340		FILE *f;
341		char *line_ptr;
342		int major, minor;
343	<	char dev_letter;
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	<	struct statinfo stats;
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	<	stats.dinfo=malloc(sizeof(struct devinfo));
427	<	if(stats.dinfo==NULL) return NULL;
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];
#	Line 339 | Line 452 | diskio_stat_t *get_diskio_stats(int *entries){
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	<
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);
#	Line 354 | Line 476 | diskio_stat_t *get_diskio_stats(int *entries){
476		num_diskio++;
477		}
478		free(dev_sel);
357	–	free(stats.dinfo);
479
480		#endif
481		#ifdef SOLARIS
#	Line 383 | 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		}
#	Line 393 | Line 514 | diskio_stat_t *get_diskio_stats(int *entries){
514		#endif
515
516		#ifdef LINUX
517	<	f=fopen("/proc/stat", "r");
518	<	if(f==NULL){
519	<	*entries=0;
520	<	return NULL;
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((line_ptr=f_read_line(f, "disk_io:"))==NULL){
532	<	*entries=0;
533	<	fclose(f);
534	<	return NULL;
535	<	}
536	<	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
537	<	line_ptr++;
538	<	if(*line_ptr=='\0'){
539	<	break;
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	<	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
556	<	fclose(f);
557	<	*entries=0;
558	<	return NULL;
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		}
416	–	diskio_stats_ptr=diskio_stats+num_diskio;
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	<	if((sscanf(line_ptr, "(%d,%d):(%*d, %*d, %lld, %*d, %lld)", \
578	<	&major, \
421	<	&minor, \
422	<	&diskio_stats_ptr->read_bytes, \
423	<	&diskio_stats_ptr->write_bytes))!=4) {
424	<	continue;
425	<	}
577	>	n++;
578	>	}
579
580	<	/* We read the number of blocks. Blocks are stored in 512 bytes */
581	<	diskio_stats_ptr->read_bytes=diskio_stats_ptr->read_bytes*512;
429	<	diskio_stats_ptr->write_bytes=diskio_stats_ptr->write_bytes*512;
580	>	fclose(f);
581	>	f = NULL;
582
583	<	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
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	<	switch(major){
589	<	case 2:
590	<	if(minor==0){
591	<	diskio_stats_ptr->disk_name=strdup("fd0");
592	<	}
593	<	break;
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	<	case 3:
599	<	if(minor==0){
600	<	diskio_stats_ptr->disk_name=strdup("hda");
601	<	}else{
602	<	diskio_stats_ptr->disk_name=strdup("hdb");
603	<	}
604	<	break;
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	<	if(minor==0){
618	<	diskio_stats_ptr->disk_name=strdup("hdc");
619	<	}else{
620	<	diskio_stats_ptr->disk_name=strdup("hdd");
621	<	}
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 8:
629	<	dev_letter='a'+(minor/16);
457	<	diskio_stats_ptr->disk_name=malloc(4);
458	<	snprintf(diskio_stats_ptr->disk_name, 4, "sd%c", dev_letter);
628	>	case 9:
629	>	case 43:
630		break;
631		default:
632	<	/* I have no idea what it is then :) */
462	<	diskio_stats_ptr->disk_name=malloc(16);
463	<	snprintf(diskio_stats_ptr->disk_name, 16, "%d %d", major, minor);
632	>	minor *= 16;
633		break;
634	<	}
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	<	diskio_stats_ptr->systime=time(NULL);
643	<	num_diskio++;
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	<	fclose(f);
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 510 | 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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