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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 1.56 by ats, Sun Apr 4 22:18:38 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 "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
35		#ifdef SOLARIS
36		#include <sys/mnttab.h>
32	–	#include <sys/types.h>
37		#include <sys/statvfs.h>
38	<
38	>	#include <kstat.h>
39		#define VALID_FS_TYPES {"ufs", "tmpfs"}
40	+	#endif
41
42	+	#if defined(LINUX) || defined(CYGWIN)
43	+	#include <mntent.h>
44	+	#include <sys/vfs.h>
45	+	#include "tools.h"
46		#endif
47
48	<	#define START_VAL 1
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	+	#ifdef CYGWIN
57	+	#define VALID_FS_TYPES {"user"}
58	+	#endif
59	+
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		char *copy_string(char *orig_ptr, const char *newtext){
80
81		/* Maybe free if not NULL, and strdup rather than realloc and strcpy? */
#	Line 50 | Line 88 | char *copy_string(char *orig_ptr, const char *newtext)
88		return orig_ptr;
89		}
90
91	+	static void disk_stat_init(disk_stat_t *d) {
92	+	d->device_name = NULL;
93	+	d->fs_type = NULL;
94	+	d->mnt_point = NULL;
95	+	}
96
97	<	void init_disk_stat(int start, int end, disk_stat_t *disk_stats){
97	>	static void disk_stat_destroy(disk_stat_t *d) {
98	>	free(d->device_name);
99	>	free(d->fs_type);
100	>	free(d->mnt_point);
101	>	}
102
103	<	for(disk_stats+=start; start<=end; start++){
104	<	disk_stats->device_name=NULL;
105	<	disk_stats->fs_type=NULL;
59	<	disk_stats->mnt_point=NULL;
60	<
61	<	disk_stats++;
62	<	}
103	>	int is_valid_fs_type(const char *type) {
104	>	const char *types[] = VALID_FS_TYPES;
105	>	int i;
106
107	+	for (i = 0; i < (sizeof types / sizeof *types); i++) {
108	+	if (strcmp(types[i], type) == 0) {
109	+	return 1;
110	+	}
111	+	}
112	+	return 0;
113		}
114
115		disk_stat_t *get_disk_stats(int *entries){
116	+	VECTOR_DECLARE_STATIC(disk_stats, disk_stat_t, 10,
117	+	disk_stat_init, disk_stat_destroy);
118
119	<	static disk_stat_t *disk_stats;
120	<	static int watermark=-1;
119	>	int valid_type;
120	>	int num_disks=0;
121	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
122	>	FILE *f;
123	>	#endif
124
125	<	char *fs_types[] = VALID_FS_TYPES;
72	<	int x, valid_type;
125	>	disk_stat_t *disk_ptr;
126
127	<	int num_disks=0;
127	>	#ifdef SOLARIS
128		struct mnttab mp;
129		struct statvfs fs;
130	<	FILE *f;
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	<	disk_stat_t *disk_ptr;
140	>	#ifdef ALLBSD
141	>	nummnt=getmntinfo(&mp , MNT_LOCAL);
142	>	if (nummnt<=0){
143	>	return NULL;
144	>	}
145	>	for(;nummnt--; mp++){
146	>	valid_type = is_valid_fs_type(mp->f_fstypename);
147	>	#endif
148
149	<	if(watermark==-1){
150	<	disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
151	<	if(disk_stats==NULL){
84	<	return NULL;
85	<	}
86	<	watermark=START_VAL;
87	<	init_disk_stat(0, watermark-1, disk_stats);
149	>	#if defined(LINUX) || defined(CYGWIN)
150	>	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
151	>	return NULL;
152		}
153
154	+	while((mp=getmntent(f))){
155	+	if((statfs(mp->mnt_dir, &fs)) !=0){
156	+	continue;
157	+	}
158
159	+	valid_type = is_valid_fs_type(mp->mnt_type);
160	+	#endif
161	+
162	+	#ifdef SOLARIS
163		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
164		return NULL;
165		}
#	Line 95 | Line 167 | disk_stat_t *get_disk_stats(int *entries){
167		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
168		continue;
169		}
170	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
171	+	#endif
172
173	<	valid_type=0;
174	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
175	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
102	<	valid_type=1;
103	<	break;
173	>	if(valid_type){
174	>	if (VECTOR_RESIZE(disk_stats, num_disks + 1) < 0) {
175	>	return NULL;
176		}
177	<	}
177	>	disk_ptr=disk_stats+num_disks;
178
179	<	if(valid_type){
180	<	if(num_disks>watermark-1){
181	<	disk_ptr=disk_stats;
182	<	if((disk_stats=realloc(disk_stats, (watermark*2 * sizeof(disk_stat_t))))==NULL){
111	<	disk_stats=disk_ptr;
112	<	return NULL;
113	<	}
179	>	#ifdef ALLBSD
180	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
181	>	return NULL;
182	>	}
183
184	<	watermark=watermark*2;
185	<	init_disk_stat(num_disks, watermark-1, disk_stats);
184	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->f_fstypename))==NULL){
185	>	return NULL;
186		}
187
188	<	disk_ptr=disk_stats+num_disks;
189	<
188	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->f_mntonname))==NULL){
189	>	return NULL;
190	>	}
191	>
192	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
193	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
194	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
195	>
196	>	disk_ptr->total_inodes=(long long)mp->f_files;
197	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
198	>	/* Freebsd doesn't have a "available" inodes */
199	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
200	>	#endif
201	>	#if defined(LINUX) || defined(CYGWIN)
202	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->mnt_fsname))==NULL){
203	>	return NULL;
204	>	}
205	>
206	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->mnt_type))==NULL){
207	>	return NULL;
208	>	}
209	>
210	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->mnt_dir))==NULL){
211	>	return NULL;
212	>	}
213	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
214	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
215	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
216	>
217	>	disk_ptr->total_inodes=(long long)fs.f_files;
218	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
219	>	/* Linux doesn't have a "available" inodes */
220	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
221	>	#endif
222	>
223	>	#ifdef SOLARIS
224		/* Memory leak in event of realloc failing */
225		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
226	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
227	<	of a k each */
226	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
227	>	* be upwards of a k each
228	>	*/
229		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
230		return NULL;
231		}
#	Line 141 | Line 245 | disk_stat_t *get_disk_stats(int *entries){
245		disk_ptr->total_inodes=(long long)fs.f_files;
246		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
247		disk_ptr->free_inodes=(long long)fs.f_favail;
248	<
248	>	#endif
249		num_disks++;
250		}
251		}
252
253		*entries=num_disks;
254
255	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
255	>	/* If this fails, there is very little i can do about it, so
256	>	I'll ignore it :) */
257	>	#if defined(LINUX) || defined(CYGWIN)
258	>	endmntent(f);
259	>	#endif
260	>	#if defined(SOLARIS)
261		fclose(f);
262	+	#endif
263
264		return disk_stats;
265
266		}
267
268	+	static void diskio_stat_init(diskio_stat_t *d) {
269	+	d->disk_name = NULL;
270	+	}
271	+
272	+	static void diskio_stat_destroy(diskio_stat_t *d) {
273	+	free(d->disk_name);
274	+	}
275	+
276	+	VECTOR_DECLARE_STATIC(diskio_stats, diskio_stat_t, 10,
277	+	diskio_stat_init, diskio_stat_destroy);
278	+
279	+	#ifdef LINUX
280	+	typedef struct {
281	+	int major;
282	+	int minor;
283	+	} partition;
284	+	#endif
285	+
286		diskio_stat_t *get_diskio_stats(int *entries){
287	+	int num_diskio;
288	+	#ifndef LINUX
289	+	diskio_stat_t *diskio_stats_ptr;
290	+	#endif
291
292	<	/* Do jibble */
292	>	#ifdef SOLARIS
293	>	kstat_ctl_t *kc;
294	>	kstat_t *ksp;
295	>	kstat_io_t kios;
296	>	#endif
297	>	#ifdef LINUX
298	>	FILE *f;
299	>	char *line_ptr;
300	>	int major, minor;
301	>	int has_pp_stats = 1;
302	>	static partition *parts = NULL;
303	>	static int alloc_parts = 0;
304	>	int i, n;
305	>	time_t now;
306	>	const char *format;
307	>	#endif
308	>	#if defined(FREEBSD) || defined(DFBSD)
309	>	static struct statinfo stats;
310	>	static int stats_init = 0;
311	>	int counter;
312	>	struct device_selection *dev_sel = NULL;
313	>	int n_selected, n_selections;
314	>	long sel_gen;
315	>	struct devstat *dev_ptr;
316	>	#endif
317	>	#ifdef NETBSD
318	>	struct disk_sysctl *stats;
319	>	#endif
320	>	#ifdef OPENBSD
321	>	int diskcount;
322	>	char *disknames, *name, *bufpp;
323	>	char **dk_name;
324	>	struct diskstats *stats;
325	>	#endif
326	>	#ifdef NETBSD
327	>	#define MIBSIZE 3
328	>	#endif
329	>	#ifdef OPENBSD
330	>	#define MIBSIZE 2
331	>	#endif
332	>	#if defined(NETBSD) || defined(OPENBSD)
333	>	int num_disks, i;
334	>	int mib[MIBSIZE];
335	>	size_t size;
336	>	#endif
337	>
338	>	num_diskio=0;
339	>
340	>	#ifdef OPENBSD
341	>	mib[0] = CTL_HW;
342	>	mib[1] = HW_DISKCOUNT;
343	>
344	>	size = sizeof(diskcount);
345	>	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
346	>	return NULL;
347	>	}
348	>
349	>	mib[0] = CTL_HW;
350	>	mib[1] = HW_DISKNAMES;
351	>
352	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
353	>	return NULL;
354	>	}
355	>
356	>	disknames = malloc(size);
357	>	if (disknames == NULL) {
358	>	return NULL;
359	>	}
360	>
361	>	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
362	>	return NULL;
363	>	}
364	>
365	>	dk_name = calloc(diskcount, sizeof(char *));
366	>	bufpp = disknames;
367	>	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
368	>	dk_name[i] = name;
369	>	}
370	>	#endif
371	>
372	>	#if defined(NETBSD) || defined(OPENBSD)
373	>	mib[0] = CTL_HW;
374	>	mib[1] = HW_DISKSTATS;
375	>	#ifdef NETBSD
376	>	mib[2] = sizeof(struct disk_sysctl);
377	>	#endif
378	>
379	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
380	>	return NULL;
381	>	}
382	>
383	>	#ifdef NETBSD
384	>	num_disks = size / sizeof(struct disk_sysctl);
385	>	#else
386	>	num_disks = size / sizeof(struct diskstats);
387	>	#endif
388	>
389	>	stats = malloc(size);
390	>	if (stats == NULL) {
391	>	return NULL;
392	>	}
393	>
394	>	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
395	>	return NULL;
396	>	}
397	>
398	>	for (i = 0; i < num_disks; i++) {
399	>	u_int64_t rbytes, wbytes;
400	>
401	>	#ifdef NETBSD
402	>	#ifdef HAVE_DK_RBYTES
403	>	rbytes = stats[i].dk_rbytes;
404	>	wbytes = stats[i].dk_wbytes;
405	>	#else
406	>	/* Before 1.7, NetBSD merged reads and writes. */
407	>	rbytes = wbytes = stats[i].dk_bytes;
408	>	#endif
409	>	#else
410	>	rbytes = wbytes = stats[i].ds_bytes;
411	>	#endif
412	>
413	>	/* Don't keep stats for disks that have never been used. */
414	>	if (rbytes == 0 && wbytes == 0) {
415	>	continue;
416	>	}
417	>
418	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
419	>	return NULL;
420	>	}
421	>	diskio_stats_ptr = diskio_stats + num_diskio;
422	>
423	>	diskio_stats_ptr->read_bytes = rbytes;
424	>	diskio_stats_ptr->write_bytes = wbytes;
425	>	if (diskio_stats_ptr->disk_name != NULL) {
426	>	free(diskio_stats_ptr->disk_name);
427	>	}
428	>	#ifdef NETBSD
429	>	diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
430	>	#else
431	>	diskio_stats_ptr->disk_name = strdup(dk_name[i]);
432	>	#endif
433	>	diskio_stats_ptr->systime = time(NULL);
434	>
435	>	num_diskio++;
436	>	}
437	>
438	>	free(stats);
439	>	#ifdef OPENBSD
440	>	free(dk_name);
441	>	free(disknames);
442	>	#endif
443	>	#endif
444	>
445	>	#if defined(FREEBSD) || defined(DFBSD)
446	>	if (!stats_init) {
447	>	stats.dinfo=malloc(sizeof(struct devinfo));
448	>	if(stats.dinfo==NULL) return NULL;
449	>	bzero(stats.dinfo, sizeof(struct devinfo));
450	>	stats_init = 1;
451	>	}
452	>	#ifdef FREEBSD5
453	>	if ((devstat_getdevs(NULL, &stats)) < 0) return NULL;
454	>	/* Not aware of a get all devices, so i said 999. If we ever
455	>	* find a machine with more than 999 disks, then i'll change
456	>	* this number :)
457	>	*/
458	>	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;
459	>	#else
460	>	if ((getdevs(&stats)) < 0) return NULL;
461	>	/* Not aware of a get all devices, so i said 999. If we ever
462	>	* find a machine with more than 999 disks, then i'll change
463	>	* this number :)
464	>	*/
465	>	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;
466	>	#endif
467	>
468	>	for(counter=0;counter<stats.dinfo->numdevs;counter++){
469	>	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
470	>
471	>	/* Throw away devices that have done nothing, ever.. Eg "odd"
472	>	* devices.. like mem, proc.. and also doesn't report floppy
473	>	* drives etc unless they are doing stuff :)
474	>	*/
475	>	#ifdef FREEBSD5
476	>	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
477	>	#else
478	>	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
479	>	#endif
480	>
481	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
482	>	return NULL;
483	>	}
484	>	diskio_stats_ptr=diskio_stats+num_diskio;
485	>
486	>	#ifdef FREEBSD5
487	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
488	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
489	>	#else
490	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
491	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
492	>	#endif
493	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
494	>	asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number);
495	>	diskio_stats_ptr->systime=time(NULL);
496	>
497	>	num_diskio++;
498	>	}
499	>	free(dev_sel);
500	>
501	>	#endif
502	>	#ifdef SOLARIS
503	>	if ((kc = kstat_open()) == NULL) {
504	>	return NULL;
505	>	}
506	>
507	>	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
508	>	if (!strcmp(ksp->ks_class, "disk")) {
509	>
510	>	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
511	>	/* We dont want metadevices appearins as num_diskio */
512	>	if(strcmp(ksp->ks_module, "md")==0) continue;
513	>	if((kstat_read(kc, ksp, &kios))==-1){
514	>	}
515	>
516	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
517	>	kstat_close(kc);
518	>	return NULL;
519	>	}
520	>	diskio_stats_ptr=diskio_stats+num_diskio;
521	>
522	>	diskio_stats_ptr->read_bytes=kios.nread;
523	>
524	>	diskio_stats_ptr->write_bytes=kios.nwritten;
525	>
526	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
527	>
528	>	diskio_stats_ptr->disk_name=strdup((char *) get_svr_from_bsd(ksp->ks_name));
529	>	diskio_stats_ptr->systime=time(NULL);
530	>	num_diskio++;
531	>	}
532	>	}
533	>
534	>	kstat_close(kc);
535	>	#endif
536	>
537	>	#ifdef LINUX
538	>	num_diskio = 0;
539	>	n = 0;
540	>
541	>	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
542	>	have statistics in here too, so we can use those directly.
543	>	2.6 kernels have /proc/diskstats instead with almost (but not quite)
544	>	the same format. */
545	>
546	>	f = fopen("/proc/diskstats", "r");
547	>	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
548	>	if (f == NULL) {
549	>	f = fopen("/proc/partitions", "r");
550	>	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
551	>	}
552	>	if (f == NULL) goto out;
553	>	now = time(NULL);
554	>
555	>	while ((line_ptr = f_read_line(f, "")) != NULL) {
556	>	char name[100];
557	>	char *s;
558	>	long long rsect, wsect;
559	>
560	>	int nr = sscanf(line_ptr, format,
561	>	&major, &minor, name, &rsect, &wsect);
562	>	if (nr < 3) continue;
563	>
564	>	/* Skip device names ending in numbers, since they're
565	>	partitions. */
566	>	s = name;
567	>	while (*s != '\0') s++;
568	>	--s;
569	>	if (*s >= '0' && *s <= '9') continue;
570	>
571	>	if (nr < 5) {
572	>	has_pp_stats = 0;
573	>	rsect = 0;
574	>	wsect = 0;
575	>	}
576	>
577	>	if (VECTOR_RESIZE(diskio_stats, n + 1) < 0) {
578	>	goto out;
579	>	}
580	>	if (n >= alloc_parts) {
581	>	alloc_parts += 16;
582	>	parts = realloc(parts, alloc_parts * sizeof *parts);
583	>	if (parts == NULL) {
584	>	alloc_parts = 0;
585	>	goto out;
586	>	}
587	>	}
588	>
589	>	if (diskio_stats[n].disk_name != NULL)
590	>	free(diskio_stats[n].disk_name);
591	>	diskio_stats[n].disk_name = strdup(name);
592	>	diskio_stats[n].read_bytes = rsect * 512;
593	>	diskio_stats[n].write_bytes = wsect * 512;
594	>	diskio_stats[n].systime = now;
595	>	parts[n].major = major;
596	>	parts[n].minor = minor;
597	>
598	>	n++;
599	>	}
600	>
601	>	fclose(f);
602	>	f = NULL;
603	>
604	>	if (!has_pp_stats) {
605	>	/* This is an older kernel where /proc/partitions doesn't
606	>	contain stats. Read what we can from /proc/stat instead, and
607	>	fill in the appropriate bits of the list allocated above. */
608	>
609	>	f = fopen("/proc/stat", "r");
610	>	if (f == NULL) goto out;
611	>	now = time(NULL);
612	>
613	>	line_ptr = f_read_line(f, "disk_io:");
614	>	if (line_ptr == NULL) goto out;
615	>
616	>	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
617	>	long long rsect, wsect;
618	>
619	>	if (*++line_ptr == '\0') break;
620	>
621	>	if((sscanf(line_ptr,
622	>	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
623	>	&major, &minor, &rsect, &wsect)) != 4) {
624	>	continue;
625	>	}
626	>
627	>	/* Find the corresponding device from earlier.
628	>	Just to add to the fun, "minor" is actually the disk
629	>	number, not the device minor, so we need to figure
630	>	out the real minor number based on the major!
631	>	This list is not exhaustive; if you're running
632	>	an older kernel you probably don't have fancy
633	>	I2O hardware anyway... */
634	>	switch (major) {
635	>	case 3:
636	>	case 21:
637	>	case 22:
638	>	case 33:
639	>	case 34:
640	>	case 36:
641	>	case 56:
642	>	case 57:
643	>	case 88:
644	>	case 89:
645	>	case 90:
646	>	case 91:
647	>	minor *= 64;
648	>	break;
649	>	case 9:
650	>	case 43:
651	>	break;
652	>	default:
653	>	minor *= 16;
654	>	break;
655	>	}
656	>	for (i = 0; i < n; i++) {
657	>	if (major == parts[i].major
658	>	&& minor == parts[i].minor)
659	>	break;
660	>	}
661	>	if (i == n) continue;
662	>
663	>	/* We read the number of blocks. Blocks are stored in
664	>	512 bytes */
665	>	diskio_stats[i].read_bytes = rsect * 512;
666	>	diskio_stats[i].write_bytes = wsect * 512;
667	>	diskio_stats[i].systime = now;
668	>	}
669	>	}
670	>
671	>	num_diskio = n;
672	>	out:
673	>	if (f != NULL) fclose(f);
674	>	#endif
675	>
676	>	#ifdef CYGWIN
677		return NULL;
678	+	#endif
679	+
680	+	*entries=num_diskio;
681	+
682	+	return diskio_stats;
683		}
684	+
685	+	diskio_stat_t *get_diskio_stats_diff(int *entries){
686	+	VECTOR_DECLARE_STATIC(diff, diskio_stat_t, 1,
687	+	diskio_stat_init, diskio_stat_destroy);
688	+	diskio_stat_t *src = NULL, *dest;
689	+	int i, j, diff_count, new_count;
690	+
691	+	if (diskio_stats == NULL) {
692	+	/* No previous stats, so we can't calculate a difference. */
693	+	return get_diskio_stats(entries);
694	+	}
695	+
696	+	/* Resize the results array to match the previous stats. */
697	+	diff_count = VECTOR_SIZE(diskio_stats);
698	+	if (VECTOR_RESIZE(diff, diff_count) < 0) {
699	+	return NULL;
700	+	}
701	+
702	+	/* Copy the previous stats into the result. */
703	+	for (i = 0; i < diff_count; i++) {
704	+	src = &diskio_stats[i];
705	+	dest = &diff[i];
706	+
707	+	if (dest->disk_name != NULL) {
708	+	free(dest->disk_name);
709	+	}
710	+	dest->disk_name = strdup(src->disk_name);
711	+	dest->read_bytes = src->read_bytes;
712	+	dest->write_bytes = src->write_bytes;
713	+	dest->systime = src->systime;
714	+	}
715	+
716	+	/* Get a new set of stats. */
717	+	if (get_diskio_stats(&new_count) == NULL) {
718	+	return NULL;
719	+	}
720	+
721	+	/* For each previous stat... */
722	+	for (i = 0; i < diff_count; i++) {
723	+	dest = &diff[i];
724	+
725	+	/* ... find the corresponding new stat ... */
726	+	for (j = 0; j < new_count; j++) {
727	+	/* Try the new stat in the same position first,
728	+	since that's most likely to be it. */
729	+	src = &diskio_stats[(i + j) % new_count];
730	+	if (strcmp(src->disk_name, dest->disk_name) == 0) {
731	+	break;
732	+	}
733	+	}
734	+	if (j == new_count) {
735	+	/* No match found. */
736	+	continue;
737	+	}
738	+
739	+	/* ... and subtract the previous stat from it to get the
740	+	difference. */
741	+	dest->read_bytes = src->read_bytes - dest->read_bytes;
742	+	dest->write_bytes = src->write_bytes - dest->write_bytes;
743	+	dest->systime = src->systime - dest->systime;
744	+	}
745	+
746	+	*entries = diff_count;
747	+	return diff;
748	+	}
749	+

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