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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 1.54 by ats, Fri Mar 19 23:44:30 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	>	* $Id$
22		*/
23
24		#ifdef HAVE_CONFIG_H
25		#include "config.h"
26		#endif
27
25	–	#include <stdlib.h>
28		#include <stdio.h>
29	+	#include <stdlib.h>
30		#include <string.h>
31	+	#include <time.h>
32		#include "statgrab.h"
33
34		#ifdef SOLARIS
#	Line 34 | Line 38
38		#define VALID_FS_TYPES {"ufs", "tmpfs"}
39		#endif
40
41	+	#if defined(LINUX) || defined(CYGWIN)
42	+	#include <mntent.h>
43	+	#include <sys/vfs.h>
44	+	#include "tools.h"
45	+	#endif
46	+
47	+	#ifdef LINUX
48	+	#define VALID_FS_TYPES {"adfs", "affs", "befs", "bfs", "efs", "ext2", \
49	+	"ext3", "vxfs", "hfs", "hfsplus", "hpfs", "jffs", \
50	+	"jffs2", "minix", "msdos", "ntfs", "qnx4", "ramfs", \
51	+	"rootfs", "reiserfs", "sysv", "v7", "udf", "ufs", \
52	+	"umsdos", "vfat", "xfs", "jfs"}
53	+	#endif
54	+
55	+	#ifdef CYGWIN
56	+	#define VALID_FS_TYPES {"user"}
57	+	#endif
58	+
59	+	#ifdef ALLBSD
60	+	#include <sys/param.h>
61	+	#include <sys/ucred.h>
62	+	#include <sys/mount.h>
63	+	#endif
64	+	#if defined(FREEBSD) || defined(DFBSD)
65	+	#include <sys/dkstat.h>
66	+	#include <devstat.h>
67	+	#define VALID_FS_TYPES {"hpfs", "msdosfs", "ntfs", "udf", "ext2fs", \
68	+	"ufs", "mfs"}
69	+	#endif
70	+	#if defined(NETBSD) || defined(OPENBSD)
71	+	#include <sys/param.h>
72	+	#include <sys/sysctl.h>
73	+	#include <sys/disk.h>
74	+	#define VALID_FS_TYPES {"ffs", "mfs", "msdos", "lfs", "adosfs", "ext2fs", \
75	+	"ntfs"}
76	+	#endif
77	+
78		#define START_VAL 1
79
80		char *copy_string(char *orig_ptr, const char *newtext){
#	Line 60 | Line 101 | void init_disk_stat(int start, int end, disk_stat_t *d
101		}
102		}
103
104	+	int is_valid_fs_type(const char *type) {
105	+	const char *types[] = VALID_FS_TYPES;
106	+	int i;
107	+
108	+	for (i = 0; i < (sizeof types / sizeof *types); i++) {
109	+	if (strcmp(types[i], type) == 0) {
110	+	return 1;
111	+	}
112	+	}
113	+	return 0;
114	+	}
115	+
116		disk_stat_t *get_disk_stats(int *entries){
117
118		static disk_stat_t *disk_stats;
119		static int watermark=-1;
120
121	<	char *fs_types[] = VALID_FS_TYPES;
69	<	int x, valid_type;
70	<
121	>	int valid_type;
122		int num_disks=0;
123	<	struct mnttab mp;
73	<	struct statvfs fs;
123	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
124		FILE *f;
125	+	#endif
126
127		disk_stat_t *disk_ptr;
128
129	+	#ifdef SOLARIS
130	+	struct mnttab mp;
131	+	struct statvfs fs;
132	+	#endif
133	+	#if defined(LINUX) || defined(CYGWIN)
134	+	struct mntent *mp;
135	+	struct statfs fs;
136	+	#endif
137	+	#ifdef ALLBSD
138	+	int nummnt;
139	+	struct statfs *mp;
140	+	#endif
141	+
142		if(watermark==-1){
143		disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
144		if(disk_stats==NULL){
#	Line 83 | Line 147 | disk_stat_t *get_disk_stats(int *entries){
147		watermark=START_VAL;
148		init_disk_stat(0, watermark-1, disk_stats);
149		}
150	+	#ifdef ALLBSD
151	+	nummnt=getmntinfo(&mp , MNT_LOCAL);
152	+	if (nummnt<=0){
153	+	return NULL;
154	+	}
155	+	for(;nummnt--; mp++){
156	+	valid_type = is_valid_fs_type(mp->f_fstypename);
157	+	#endif
158
159	+	#if defined(LINUX) || defined(CYGWIN)
160	+	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
161	+	return NULL;
162	+	}
163
164	+	while((mp=getmntent(f))){
165	+	if((statfs(mp->mnt_dir, &fs)) !=0){
166	+	continue;
167	+	}
168	+
169	+	valid_type = is_valid_fs_type(mp->mnt_type);
170	+	#endif
171	+
172	+	#ifdef SOLARIS
173		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
174		return NULL;
175		}
#	Line 92 | Line 177 | disk_stat_t *get_disk_stats(int *entries){
177		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
178		continue;
179		}
180	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
181	+	#endif
182
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	–
183		if(valid_type){
184		if(num_disks>watermark-1){
185		disk_ptr=disk_stats;
#	Line 114 | Line 193 | disk_stat_t *get_disk_stats(int *entries){
193		}
194
195		disk_ptr=disk_stats+num_disks;
196	<
196	>	#ifdef ALLBSD
197	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
198	>	return NULL;
199	>	}
200	>
201	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->f_fstypename))==NULL){
202	>	return NULL;
203	>	}
204	>
205	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->f_mntonname))==NULL){
206	>	return NULL;
207	>	}
208	>
209	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
210	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
211	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
212	>
213	>	disk_ptr->total_inodes=(long long)mp->f_files;
214	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
215	>	/* Freebsd doesn't have a "available" inodes */
216	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
217	>	#endif
218	>	#if defined(LINUX) || defined(CYGWIN)
219	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->mnt_fsname))==NULL){
220	>	return NULL;
221	>	}
222	>
223	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->mnt_type))==NULL){
224	>	return NULL;
225	>	}
226	>
227	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->mnt_dir))==NULL){
228	>	return NULL;
229	>	}
230	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
231	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
232	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
233	>
234	>	disk_ptr->total_inodes=(long long)fs.f_files;
235	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
236	>	/* Linux doesn't have a "available" inodes */
237	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
238	>	#endif
239	>
240	>	#ifdef SOLARIS
241		/* Memory leak in event of realloc failing */
242		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
243	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
244	<	of a k each */
243	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
244	>	* be upwards of a k each
245	>	*/
246		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
247		return NULL;
248		}
#	Line 138 | Line 262 | disk_stat_t *get_disk_stats(int *entries){
262		disk_ptr->total_inodes=(long long)fs.f_files;
263		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
264		disk_ptr->free_inodes=(long long)fs.f_favail;
265	<
265	>	#endif
266		num_disks++;
267		}
268		}
269
270		*entries=num_disks;
271
272	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
272	>	/* If this fails, there is very little i can do about it, so
273	>	I'll ignore it :) */
274	>	#if defined(LINUX) || defined(CYGWIN)
275	>	endmntent(f);
276	>	#endif
277	>	#if defined(SOLARIS)
278		fclose(f);
279	+	#endif
280
281		return disk_stats;
282
283		}
154	–
284		void diskio_stat_init(int start, int end, diskio_stat_t *diskio_stats){
285
286		for(diskio_stats+=start; start<end; start++){
#	Line 190 | Line 319 | diskio_stat_t *diskio_stat_malloc(int needed_entries,
319		static diskio_stat_t *diskio_stats=NULL;
320		static int num_diskio=0;
321
322	+	#ifdef LINUX
323	+	typedef struct {
324	+	int major;
325	+	int minor;
326	+	} partition;
327	+	#endif
328	+
329		diskio_stat_t *get_diskio_stats(int *entries){
330
331		static int sizeof_diskio_stats=0;
332	+	#ifndef LINUX
333		diskio_stat_t *diskio_stats_ptr;
334	+	#endif
335
336	+	#ifdef SOLARIS
337		kstat_ctl_t *kc;
338		kstat_t *ksp;
339		kstat_io_t kios;
340	+	#endif
341	+	#ifdef LINUX
342	+	FILE *f;
343	+	char *line_ptr;
344	+	int major, minor;
345	+	int has_pp_stats = 1;
346	+	static partition *parts = NULL;
347	+	static int alloc_parts = 0;
348	+	int i, n;
349	+	time_t now;
350	+	const char *format;
351	+	#endif
352	+	#if defined(FREEBSD) || defined(DFBSD)
353	+	static struct statinfo stats;
354	+	static int stats_init = 0;
355	+	int counter;
356	+	struct device_selection *dev_sel = NULL;
357	+	int n_selected, n_selections;
358	+	long sel_gen;
359	+	struct devstat *dev_ptr;
360	+	#endif
361	+	#ifdef NETBSD
362	+	struct disk_sysctl *stats;
363	+	#endif
364	+	#ifdef OPENBSD
365	+	int diskcount;
366	+	char *disknames, *name, *bufpp;
367	+	char **dk_name;
368	+	struct diskstats *stats;
369	+	#endif
370	+	#ifdef NETBSD
371	+	#define MIBSIZE 3
372	+	#endif
373	+	#ifdef OPENBSD
374	+	#define MIBSIZE 2
375	+	#endif
376	+	#if defined(NETBSD) || defined(OPENBSD)
377	+	int num_disks, i;
378	+	int mib[MIBSIZE];
379	+	size_t size;
380	+	#endif
381
382	+	num_diskio=0;
383	+
384	+	#ifdef OPENBSD
385	+	mib[0] = CTL_HW;
386	+	mib[1] = HW_DISKCOUNT;
387	+
388	+	size = sizeof(diskcount);
389	+	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
390	+	return NULL;
391	+	}
392	+
393	+	mib[0] = CTL_HW;
394	+	mib[1] = HW_DISKNAMES;
395	+
396	+	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
397	+	return NULL;
398	+	}
399	+
400	+	disknames = malloc(size);
401	+	if (disknames == NULL) {
402	+	return NULL;
403	+	}
404	+
405	+	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
406	+	return NULL;
407	+	}
408	+
409	+	dk_name = calloc(diskcount, sizeof(char *));
410	+	bufpp = disknames;
411	+	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
412	+	dk_name[i] = name;
413	+	}
414	+	#endif
415	+
416	+	#if defined(NETBSD) || defined(OPENBSD)
417	+	mib[0] = CTL_HW;
418	+	mib[1] = HW_DISKSTATS;
419	+	#ifdef NETBSD
420	+	mib[2] = sizeof(struct disk_sysctl);
421	+	#endif
422	+
423	+	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
424	+	return NULL;
425	+	}
426	+
427	+	#ifdef NETBSD
428	+	num_disks = size / sizeof(struct disk_sysctl);
429	+	#else
430	+	num_disks = size / sizeof(struct diskstats);
431	+	#endif
432	+
433	+	stats = malloc(size);
434	+	if (stats == NULL) {
435	+	return NULL;
436	+	}
437	+
438	+	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
439	+	return NULL;
440	+	}
441	+
442	+	for (i = 0; i < num_disks; i++) {
443	+	u_int64_t rbytes, wbytes;
444	+
445	+	#ifdef NETBSD
446	+	#ifdef HAVE_DK_RBYTES
447	+	rbytes = stats[i].dk_rbytes;
448	+	wbytes = stats[i].dk_wbytes;
449	+	#else
450	+	/* Before 1.7, NetBSD merged reads and writes. */
451	+	rbytes = wbytes = stats[i].dk_bytes;
452	+	#endif
453	+	#else
454	+	rbytes = wbytes = stats[i].ds_bytes;
455	+	#endif
456	+
457	+	/* Don't keep stats for disks that have never been used. */
458	+	if (rbytes == 0 && wbytes == 0) {
459	+	continue;
460	+	}
461	+
462	+	diskio_stats = diskio_stat_malloc(num_diskio + 1,
463	+	&sizeof_diskio_stats,
464	+	diskio_stats);
465	+	if (diskio_stats == NULL) {
466	+	return NULL;
467	+	}
468	+	diskio_stats_ptr = diskio_stats + num_diskio;
469	+
470	+	diskio_stats_ptr->read_bytes = rbytes;
471	+	diskio_stats_ptr->write_bytes = wbytes;
472	+	if (diskio_stats_ptr->disk_name != NULL) {
473	+	free(diskio_stats_ptr->disk_name);
474	+	}
475	+	#ifdef NETBSD
476	+	diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
477	+	#else
478	+	diskio_stats_ptr->disk_name = strdup(dk_name[i]);
479	+	#endif
480	+	diskio_stats_ptr->systime = time(NULL);
481	+
482	+	num_diskio++;
483	+	}
484	+
485	+	free(stats);
486	+	#ifdef OPENBSD
487	+	free(dk_name);
488	+	free(disknames);
489	+	#endif
490	+	#endif
491	+
492	+	#if defined(FREEBSD) || defined(DFBSD)
493	+	if (!stats_init) {
494	+	stats.dinfo=malloc(sizeof(struct devinfo));
495	+	if(stats.dinfo==NULL) return NULL;
496	+	bzero(stats.dinfo, sizeof(struct devinfo));
497	+	stats_init = 1;
498	+	}
499	+	#ifdef FREEBSD5
500	+	if ((devstat_getdevs(NULL, &stats)) < 0) return NULL;
501	+	/* Not aware of a get all devices, so i said 999. If we ever
502	+	* find a machine with more than 999 disks, then i'll change
503	+	* this number :)
504	+	*/
505	+	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;
506	+	#else
507	+	if ((getdevs(&stats)) < 0) return NULL;
508	+	/* Not aware of a get all devices, so i said 999. If we ever
509	+	* find a machine with more than 999 disks, then i'll change
510	+	* this number :)
511	+	*/
512	+	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;
513	+	#endif
514	+
515	+	for(counter=0;counter<stats.dinfo->numdevs;counter++){
516	+	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
517	+
518	+	/* Throw away devices that have done nothing, ever.. Eg "odd"
519	+	* devices.. like mem, proc.. and also doesn't report floppy
520	+	* drives etc unless they are doing stuff :)
521	+	*/
522	+	#ifdef FREEBSD5
523	+	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
524	+	#else
525	+	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
526	+	#endif
527	+	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
528	+	return NULL;
529	+	}
530	+	diskio_stats_ptr=diskio_stats+num_diskio;
531	+
532	+	#ifdef FREEBSD5
533	+	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
534	+	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
535	+	#else
536	+	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
537	+	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
538	+	#endif
539	+	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
540	+	asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number);
541	+	diskio_stats_ptr->systime=time(NULL);
542	+
543	+	num_diskio++;
544	+	}
545	+	free(dev_sel);
546	+
547	+	#endif
548	+	#ifdef SOLARIS
549		if ((kc = kstat_open()) == NULL) {
550		return NULL;
551		}
552
206	–	num_diskio=0;
207	–
553		for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
554		if (!strcmp(ksp->ks_class, "disk")) {
555
#	Line 226 | Line 571 | diskio_stat_t *get_diskio_stats(int *entries){
571
572		if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
573
574	<	diskio_stats_ptr->disk_name=strdup(ksp->ks_name);
574	>	diskio_stats_ptr->disk_name=strdup((char *) get_svr_from_bsd(ksp->ks_name));
575	>	diskio_stats_ptr->systime=time(NULL);
576		num_diskio++;
577		}
578		}
579
580		kstat_close(kc);
581	+	#endif
582
583	+	#ifdef LINUX
584	+	num_diskio = 0;
585	+	n = 0;
586	+
587	+	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
588	+	have statistics in here too, so we can use those directly.
589	+	2.6 kernels have /proc/diskstats instead with almost (but not quite)
590	+	the same format. */
591	+
592	+	f = fopen("/proc/diskstats", "r");
593	+	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
594	+	if (f == NULL) {
595	+	f = fopen("/proc/partitions", "r");
596	+	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
597	+	}
598	+	if (f == NULL) goto out;
599	+	now = time(NULL);
600	+
601	+	while ((line_ptr = f_read_line(f, "")) != NULL) {
602	+	char name[100];
603	+	char *s;
604	+	long long rsect, wsect;
605	+
606	+	int nr = sscanf(line_ptr, format,
607	+	&major, &minor, name, &rsect, &wsect);
608	+	if (nr < 3) continue;
609	+
610	+	/* Skip device names ending in numbers, since they're
611	+	partitions. */
612	+	s = name;
613	+	while (*s != '\0') s++;
614	+	--s;
615	+	if (*s >= '0' && *s <= '9') continue;
616	+
617	+	if (nr < 5) {
618	+	has_pp_stats = 0;
619	+	rsect = 0;
620	+	wsect = 0;
621	+	}
622	+
623	+	diskio_stats = diskio_stat_malloc(n + 1, &sizeof_diskio_stats,
624	+	diskio_stats);
625	+	if (diskio_stats == NULL) goto out;
626	+	if (n >= alloc_parts) {
627	+	alloc_parts += 16;
628	+	parts = realloc(parts, alloc_parts * sizeof *parts);
629	+	if (parts == NULL) {
630	+	alloc_parts = 0;
631	+	goto out;
632	+	}
633	+	}
634	+
635	+	if (diskio_stats[n].disk_name != NULL)
636	+	free(diskio_stats[n].disk_name);
637	+	diskio_stats[n].disk_name = strdup(name);
638	+	diskio_stats[n].read_bytes = rsect * 512;
639	+	diskio_stats[n].write_bytes = wsect * 512;
640	+	diskio_stats[n].systime = now;
641	+	parts[n].major = major;
642	+	parts[n].minor = minor;
643	+
644	+	n++;
645	+	}
646	+
647	+	fclose(f);
648	+	f = NULL;
649	+
650	+	if (!has_pp_stats) {
651	+	/* This is an older kernel where /proc/partitions doesn't
652	+	contain stats. Read what we can from /proc/stat instead, and
653	+	fill in the appropriate bits of the list allocated above. */
654	+
655	+	f = fopen("/proc/stat", "r");
656	+	if (f == NULL) goto out;
657	+	now = time(NULL);
658	+
659	+	line_ptr = f_read_line(f, "disk_io:");
660	+	if (line_ptr == NULL) goto out;
661	+
662	+	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
663	+	long long rsect, wsect;
664	+
665	+	if (*++line_ptr == '\0') break;
666	+
667	+	if((sscanf(line_ptr,
668	+	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
669	+	&major, &minor, &rsect, &wsect)) != 4) {
670	+	continue;
671	+	}
672	+
673	+	/* Find the corresponding device from earlier.
674	+	Just to add to the fun, "minor" is actually the disk
675	+	number, not the device minor, so we need to figure
676	+	out the real minor number based on the major!
677	+	This list is not exhaustive; if you're running
678	+	an older kernel you probably don't have fancy
679	+	I2O hardware anyway... */
680	+	switch (major) {
681	+	case 3:
682	+	case 21:
683	+	case 22:
684	+	case 33:
685	+	case 34:
686	+	case 36:
687	+	case 56:
688	+	case 57:
689	+	case 88:
690	+	case 89:
691	+	case 90:
692	+	case 91:
693	+	minor *= 64;
694	+	break;
695	+	case 9:
696	+	case 43:
697	+	break;
698	+	default:
699	+	minor *= 16;
700	+	break;
701	+	}
702	+	for (i = 0; i < n; i++) {
703	+	if (major == parts[i].major
704	+	&& minor == parts[i].minor)
705	+	break;
706	+	}
707	+	if (i == n) continue;
708	+
709	+	/* We read the number of blocks. Blocks are stored in
710	+	512 bytes */
711	+	diskio_stats[i].read_bytes = rsect * 512;
712	+	diskio_stats[i].write_bytes = wsect * 512;
713	+	diskio_stats[i].systime = now;
714	+	}
715	+	}
716	+
717	+	num_diskio = n;
718	+	out:
719	+	if (f != NULL) fclose(f);
720	+	#endif
721	+
722	+	#ifdef CYGWIN
723	+	return NULL;
724	+	#endif
725	+
726		*entries=num_diskio;
727
728		return diskio_stats;
729		}
730
731		diskio_stat_t *get_diskio_stats_diff(int *entries){
732	<	static diskio_stat_t *diskio_stats_diff=NULL;
733	<	static int sizeof_diskio_stats_diff=0;
734	<	diskio_stat_t *diskio_stats_diff_ptr, *diskio_stats_ptr;
735	<	int disks, x, y;
732	>	static diskio_stat_t *diff = NULL;
733	>	static int diff_count = 0;
734	>	diskio_stat_t *src, *dest;
735	>	int i, j, new_count;
736
737	<	if(diskio_stats==NULL){
738	<	diskio_stats_ptr=get_diskio_stats(&disks);
739	<	*entries=disks;
250	<	return diskio_stats_ptr;
737	>	if (diskio_stats == NULL) {
738	>	/* No previous stats, so we can't calculate a difference. */
739	>	return get_diskio_stats(entries);
740		}
741
742	<	diskio_stats_diff=diskio_stat_malloc(num_diskio, &sizeof_diskio_stats_diff, diskio_stats_diff);
743	<	if(diskio_stats_diff==NULL){
742	>	/* Resize the results array to match the previous stats. */
743	>	diff = diskio_stat_malloc(num_diskio, &diff_count, diff);
744	>	if (diff == NULL) {
745		return NULL;
746		}
747
748	<	diskio_stats_diff_ptr=diskio_stats_diff;
749	<	diskio_stats_ptr=diskio_stats;
748	>	/* Copy the previous stats into the result. */
749	>	for (i = 0; i < diff_count; i++) {
750	>	src = &diskio_stats[i];
751	>	dest = &diff[i];
752
753	<	for(disks=0;disks<num_diskio;disks++){
754	<	if(diskio_stats_diff_ptr->disk_name!=NULL){
263	<	free(diskio_stats_diff_ptr->disk_name);
753	>	if (dest->disk_name != NULL) {
754	>	free(dest->disk_name);
755		}
756	<	diskio_stats_diff_ptr->disk_name=strdup(diskio_stats_ptr->disk_name);
757	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes;
758	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes;
759	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime;
756	>	dest->disk_name = strdup(src->disk_name);
757	>	dest->read_bytes = src->read_bytes;
758	>	dest->write_bytes = src->write_bytes;
759	>	dest->systime = src->systime;
760	>	}
761
762	<	diskio_stats_diff_ptr++;
763	<	diskio_stats_ptr++;
762	>	/* Get a new set of stats. */
763	>	if (get_diskio_stats(&new_count) == NULL) {
764	>	return NULL;
765		}
766
767	<	diskio_stats_ptr=get_diskio_stats(&disks);
768	<	diskio_stats_diff_ptr=diskio_stats_diff;
767	>	/* For each previous stat... */
768	>	for (i = 0; i < diff_count; i++) {
769	>	dest = &diff[i];
770
771	<	for(x=0;x<sizeof_diskio_stats_diff;x++){
772	<
773	<	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
774	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
775	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
776	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
777	<	}else{
284	<	diskio_stats_ptr=diskio_stats;
285	<	for(y=0;y<disks;y++){
286	<	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
287	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
288	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
289	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
290	<
291	<	break;
292	<	}
293	<
294	<	diskio_stats_ptr++;
771	>	/* ... find the corresponding new stat ... */
772	>	for (j = 0; j < new_count; j++) {
773	>	/* Try the new stat in the same position first,
774	>	since that's most likely to be it. */
775	>	src = &diskio_stats[(i + j) % new_count];
776	>	if (strcmp(src->disk_name, dest->disk_name) == 0) {
777	>	break;
778		}
779		}
780	+	if (j == new_count) {
781	+	/* No match found. */
782	+	continue;
783	+	}
784
785	<	diskio_stats_ptr++;
786	<	diskio_stats_diff_ptr++;
787	<
785	>	/* ... and subtract the previous stat from it to get the
786	>	difference. */
787	>	dest->read_bytes = src->read_bytes - dest->read_bytes;
788	>	dest->write_bytes = src->write_bytes - dest->write_bytes;
789	>	dest->systime = src->systime - dest->systime;
790		}
791	<
792	<	*entries=sizeof_diskio_stats_diff;
793	<	return diskio_stats_diff;
791	>
792	>	*entries = diff_count;
793	>	return diff;
794		}
795	+

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