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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 1.57 by ats, Sun Apr 4 22:29:54 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	>	* $Id$
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	<	char *copy_string(char *orig_ptr, const char *newtext){
56	>	#ifdef CYGWIN
57	>	#define VALID_FS_TYPES {"user"}
58	>	#endif
59
60	<	/* Maybe free if not NULL, and strdup rather than realloc and strcpy? */
61	<	orig_ptr=realloc(orig_ptr, (1+strlen(newtext)));
62	<	if(orig_ptr==NULL){
63	<	return NULL;
64	<	}
65	<	strcpy(orig_ptr, newtext);
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	<	return orig_ptr;
79	>	static char *copy_string(char **dest, const char *src) {
80	>	char *new;
81	>
82	>	new = realloc(*dest, strlen(src) + 1);
83	>	if (new == NULL) {
84	>	return NULL;
85	>	}
86	>
87	>	strcpy(new, src);
88	>	*dest = new;
89	>	return new;
90		}
91
92	+	static void disk_stat_init(disk_stat_t *d) {
93	+	d->device_name = NULL;
94	+	d->fs_type = NULL;
95	+	d->mnt_point = NULL;
96	+	}
97
98	<	void init_disk_stat(int start, int end, disk_stat_t *disk_stats){
98	>	static void disk_stat_destroy(disk_stat_t *d) {
99	>	free(d->device_name);
100	>	free(d->fs_type);
101	>	free(d->mnt_point);
102	>	}
103
104	<	for(disk_stats+=start; start<=end; start++){
105	<	disk_stats->device_name=NULL;
106	<	disk_stats->fs_type=NULL;
59	<	disk_stats->mnt_point=NULL;
60	<
61	<	disk_stats++;
62	<	}
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	+	VECTOR_DECLARE_STATIC(disk_stats, disk_stat_t, 10,
118	+	disk_stat_init, disk_stat_destroy);
119
120	<	static disk_stat_t *disk_stats;
121	<	static int watermark=-1;
120	>	int valid_type;
121	>	int num_disks=0;
122	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
123	>	FILE *f;
124	>	#endif
125
126	<	char *fs_types[] = VALID_FS_TYPES;
72	<	int x, valid_type;
126	>	disk_stat_t *disk_ptr;
127
128	<	int num_disks=0;
128	>	#ifdef SOLARIS
129		struct mnttab mp;
130		struct statvfs fs;
131	<	FILE *f;
131	>	#endif
132	>	#if defined(LINUX) || defined(CYGWIN)
133	>	struct mntent *mp;
134	>	struct statfs fs;
135	>	#endif
136	>	#ifdef ALLBSD
137	>	int nummnt;
138	>	struct statfs *mp;
139	>	#endif
140
141	<	disk_stat_t *disk_ptr;
141	>	#ifdef ALLBSD
142	>	nummnt=getmntinfo(&mp , MNT_LOCAL);
143	>	if (nummnt<=0){
144	>	return NULL;
145	>	}
146	>	for(;nummnt--; mp++){
147	>	valid_type = is_valid_fs_type(mp->f_fstypename);
148	>	#endif
149
150	<	if(watermark==-1){
151	<	disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
152	<	if(disk_stats==NULL){
84	<	return NULL;
85	<	}
86	<	watermark=START_VAL;
87	<	init_disk_stat(0, watermark-1, disk_stats);
150	>	#if defined(LINUX) || defined(CYGWIN)
151	>	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
152	>	return NULL;
153		}
154
155	+	while((mp=getmntent(f))){
156	+	if((statfs(mp->mnt_dir, &fs)) !=0){
157	+	continue;
158	+	}
159
160	+	valid_type = is_valid_fs_type(mp->mnt_type);
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		}
171	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
172	+	#endif
173
174	<	valid_type=0;
175	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
176	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
102	<	valid_type=1;
103	<	break;
174	>	if(valid_type){
175	>	if (VECTOR_RESIZE(disk_stats, num_disks + 1) < 0) {
176	>	return NULL;
177		}
178	<	}
178	>	disk_ptr=disk_stats+num_disks;
179
180	<	if(valid_type){
181	<	if(num_disks>watermark-1){
182	<	disk_ptr=disk_stats;
183	<	if((disk_stats=realloc(disk_stats, (watermark*2 * sizeof(disk_stat_t))))==NULL){
184	<	disk_stats=disk_ptr;
185	<	return NULL;
186	<	}
180	>	#ifdef ALLBSD
181	>	if (copy_string(&disk_ptr->device_name, mp->f_mntfromname) == NULL) {
182	>	return NULL;
183	>	}
184	>	if (copy_string(&disk_ptr->fs_type, mp->f_fstypename) == NULL) {
185	>	return NULL;
186	>	}
187	>	if (copy_string(&disk_ptr->mnt_point, mp->f_mntonname) == NULL) {
188	>	return NULL;
189	>	}
190
191	<	watermark=watermark*2;
192	<	init_disk_stat(num_disks, watermark-1, disk_stats);
191	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
192	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
193	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
194	>
195	>	disk_ptr->total_inodes=(long long)mp->f_files;
196	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
197	>	/* Freebsd doesn't have a "available" inodes */
198	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
199	>	#endif
200	>	#if defined(LINUX) || defined(CYGWIN)
201	>	if (copy_string(&disk_ptr->device_name, mp->mnt_fsname) == NULL) {
202	>	return NULL;
203		}
204	+
205	+	if (copy_string(&disk_ptr->fs_type, mp->mnt_type) == NULL) {
206	+	return NULL;
207	+	}
208
209	<	disk_ptr=disk_stats+num_disks;
210	<
211	<	/* Memory leak in event of realloc failing */
209	>	if (copy_string(&disk_ptr->mnt_point, mp->mnt_dir) == NULL) {
210	>	return NULL;
211	>	}
212	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
213	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
214	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
215	>
216	>	disk_ptr->total_inodes=(long long)fs.f_files;
217	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
218	>	/* Linux doesn't have a "available" inodes */
219	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
220	>	#endif
221	>
222	>	#ifdef SOLARIS
223		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
224	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
225	<	of a k each */
226	<	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
224	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
225	>	* be upwards of a k each
226	>	*/
227	>	if (copy_string(&disk_ptr->device_name, mp.mnt_special) == NULL) {
228		return NULL;
229		}
230
231	<	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp.mnt_fstype))==NULL){
231	>	if (copy_string(&disk_ptr->fs_type, mp.mnt_fstype) == NULL) {
232		return NULL;
233		}
234
235	<	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp.mnt_mountp))==NULL){
235	>	if (copy_string(&disk_ptr->mnt_point, mp.mnt_mountp) == NULL) {
236		return NULL;
237		}
238
#	Line 141 | Line 243 | disk_stat_t *get_disk_stats(int *entries){
243		disk_ptr->total_inodes=(long long)fs.f_files;
244		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
245		disk_ptr->free_inodes=(long long)fs.f_favail;
246	<
246	>	#endif
247		num_disks++;
248		}
249		}
250
251		*entries=num_disks;
252
253	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
253	>	/* If this fails, there is very little i can do about it, so
254	>	I'll ignore it :) */
255	>	#if defined(LINUX) || defined(CYGWIN)
256	>	endmntent(f);
257	>	#endif
258	>	#if defined(SOLARIS)
259		fclose(f);
260	+	#endif
261
262		return disk_stats;
263
264		}
265
266	+	static void diskio_stat_init(diskio_stat_t *d) {
267	+	d->disk_name = NULL;
268	+	}
269	+
270	+	static void diskio_stat_destroy(diskio_stat_t *d) {
271	+	free(d->disk_name);
272	+	}
273	+
274	+	VECTOR_DECLARE_STATIC(diskio_stats, diskio_stat_t, 10,
275	+	diskio_stat_init, diskio_stat_destroy);
276	+
277	+	#ifdef LINUX
278	+	typedef struct {
279	+	int major;
280	+	int minor;
281	+	} partition;
282	+	#endif
283	+
284		diskio_stat_t *get_diskio_stats(int *entries){
285	+	int num_diskio;
286	+	#ifndef LINUX
287	+	diskio_stat_t *diskio_stats_ptr;
288	+	#endif
289
290	<	/* Do jibble */
290	>	#ifdef SOLARIS
291	>	kstat_ctl_t *kc;
292	>	kstat_t *ksp;
293	>	kstat_io_t kios;
294	>	#endif
295	>	#ifdef LINUX
296	>	FILE *f;
297	>	char *line_ptr;
298	>	int major, minor;
299	>	int has_pp_stats = 1;
300	>	static partition *parts = NULL;
301	>	static int alloc_parts = 0;
302	>	int i, n;
303	>	time_t now;
304	>	const char *format;
305	>	#endif
306	>	#if defined(FREEBSD) || defined(DFBSD)
307	>	static struct statinfo stats;
308	>	static int stats_init = 0;
309	>	int counter;
310	>	struct device_selection *dev_sel = NULL;
311	>	int n_selected, n_selections;
312	>	long sel_gen;
313	>	struct devstat *dev_ptr;
314	>	#endif
315	>	#ifdef NETBSD
316	>	struct disk_sysctl *stats;
317	>	#endif
318	>	#ifdef OPENBSD
319	>	int diskcount;
320	>	char *disknames, *name, *bufpp;
321	>	char **dk_name;
322	>	struct diskstats *stats;
323	>	#endif
324	>	#ifdef NETBSD
325	>	#define MIBSIZE 3
326	>	#endif
327	>	#ifdef OPENBSD
328	>	#define MIBSIZE 2
329	>	#endif
330	>	#if defined(NETBSD) || defined(OPENBSD)
331	>	int num_disks, i;
332	>	int mib[MIBSIZE];
333	>	size_t size;
334	>	#endif
335	>
336	>	num_diskio=0;
337	>
338	>	#ifdef OPENBSD
339	>	mib[0] = CTL_HW;
340	>	mib[1] = HW_DISKCOUNT;
341	>
342	>	size = sizeof(diskcount);
343	>	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
344	>	return NULL;
345	>	}
346	>
347	>	mib[0] = CTL_HW;
348	>	mib[1] = HW_DISKNAMES;
349	>
350	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
351	>	return NULL;
352	>	}
353	>
354	>	disknames = malloc(size);
355	>	if (disknames == NULL) {
356	>	return NULL;
357	>	}
358	>
359	>	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
360	>	return NULL;
361	>	}
362	>
363	>	dk_name = calloc(diskcount, sizeof(char *));
364	>	bufpp = disknames;
365	>	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
366	>	dk_name[i] = name;
367	>	}
368	>	#endif
369	>
370	>	#if defined(NETBSD) || defined(OPENBSD)
371	>	mib[0] = CTL_HW;
372	>	mib[1] = HW_DISKSTATS;
373	>	#ifdef NETBSD
374	>	mib[2] = sizeof(struct disk_sysctl);
375	>	#endif
376	>
377	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
378	>	return NULL;
379	>	}
380	>
381	>	#ifdef NETBSD
382	>	num_disks = size / sizeof(struct disk_sysctl);
383	>	#else
384	>	num_disks = size / sizeof(struct diskstats);
385	>	#endif
386	>
387	>	stats = malloc(size);
388	>	if (stats == NULL) {
389	>	return NULL;
390	>	}
391	>
392	>	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
393	>	return NULL;
394	>	}
395	>
396	>	for (i = 0; i < num_disks; i++) {
397	>	u_int64_t rbytes, wbytes;
398	>
399	>	#ifdef NETBSD
400	>	#ifdef HAVE_DK_RBYTES
401	>	rbytes = stats[i].dk_rbytes;
402	>	wbytes = stats[i].dk_wbytes;
403	>	#else
404	>	/* Before 1.7, NetBSD merged reads and writes. */
405	>	rbytes = wbytes = stats[i].dk_bytes;
406	>	#endif
407	>	#else
408	>	rbytes = wbytes = stats[i].ds_bytes;
409	>	#endif
410	>
411	>	/* Don't keep stats for disks that have never been used. */
412	>	if (rbytes == 0 && wbytes == 0) {
413	>	continue;
414	>	}
415	>
416	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
417	>	return NULL;
418	>	}
419	>	diskio_stats_ptr = diskio_stats + num_diskio;
420	>
421	>	diskio_stats_ptr->read_bytes = rbytes;
422	>	diskio_stats_ptr->write_bytes = wbytes;
423	>	if (diskio_stats_ptr->disk_name != NULL) {
424	>	free(diskio_stats_ptr->disk_name);
425	>	}
426	>	#ifdef NETBSD
427	>	diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
428	>	#else
429	>	diskio_stats_ptr->disk_name = strdup(dk_name[i]);
430	>	#endif
431	>	diskio_stats_ptr->systime = time(NULL);
432	>
433	>	num_diskio++;
434	>	}
435	>
436	>	free(stats);
437	>	#ifdef OPENBSD
438	>	free(dk_name);
439	>	free(disknames);
440	>	#endif
441	>	#endif
442	>
443	>	#if defined(FREEBSD) || defined(DFBSD)
444	>	if (!stats_init) {
445	>	stats.dinfo=malloc(sizeof(struct devinfo));
446	>	if(stats.dinfo==NULL) return NULL;
447	>	bzero(stats.dinfo, sizeof(struct devinfo));
448	>	stats_init = 1;
449	>	}
450	>	#ifdef FREEBSD5
451	>	if ((devstat_getdevs(NULL, &stats)) < 0) return NULL;
452	>	/* Not aware of a get all devices, so i said 999. If we ever
453	>	* find a machine with more than 999 disks, then i'll change
454	>	* this number :)
455	>	*/
456	>	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;
457	>	#else
458	>	if ((getdevs(&stats)) < 0) return NULL;
459	>	/* Not aware of a get all devices, so i said 999. If we ever
460	>	* find a machine with more than 999 disks, then i'll change
461	>	* this number :)
462	>	*/
463	>	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;
464	>	#endif
465	>
466	>	for(counter=0;counter<stats.dinfo->numdevs;counter++){
467	>	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
468	>
469	>	/* Throw away devices that have done nothing, ever.. Eg "odd"
470	>	* devices.. like mem, proc.. and also doesn't report floppy
471	>	* drives etc unless they are doing stuff :)
472	>	*/
473	>	#ifdef FREEBSD5
474	>	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
475	>	#else
476	>	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
477	>	#endif
478	>
479	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
480	>	return NULL;
481	>	}
482	>	diskio_stats_ptr=diskio_stats+num_diskio;
483	>
484	>	#ifdef FREEBSD5
485	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
486	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
487	>	#else
488	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
489	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
490	>	#endif
491	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
492	>	asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number);
493	>	diskio_stats_ptr->systime=time(NULL);
494	>
495	>	num_diskio++;
496	>	}
497	>	free(dev_sel);
498	>
499	>	#endif
500	>	#ifdef SOLARIS
501	>	if ((kc = kstat_open()) == NULL) {
502	>	return NULL;
503	>	}
504	>
505	>	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
506	>	if (!strcmp(ksp->ks_class, "disk")) {
507	>
508	>	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
509	>	/* We dont want metadevices appearins as num_diskio */
510	>	if(strcmp(ksp->ks_module, "md")==0) continue;
511	>	if((kstat_read(kc, ksp, &kios))==-1){
512	>	}
513	>
514	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
515	>	kstat_close(kc);
516	>	return NULL;
517	>	}
518	>	diskio_stats_ptr=diskio_stats+num_diskio;
519	>
520	>	diskio_stats_ptr->read_bytes=kios.nread;
521	>
522	>	diskio_stats_ptr->write_bytes=kios.nwritten;
523	>
524	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
525	>
526	>	diskio_stats_ptr->disk_name=strdup((char *) get_svr_from_bsd(ksp->ks_name));
527	>	diskio_stats_ptr->systime=time(NULL);
528	>	num_diskio++;
529	>	}
530	>	}
531	>
532	>	kstat_close(kc);
533	>	#endif
534	>
535	>	#ifdef LINUX
536	>	num_diskio = 0;
537	>	n = 0;
538	>
539	>	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
540	>	have statistics in here too, so we can use those directly.
541	>	2.6 kernels have /proc/diskstats instead with almost (but not quite)
542	>	the same format. */
543	>
544	>	f = fopen("/proc/diskstats", "r");
545	>	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
546	>	if (f == NULL) {
547	>	f = fopen("/proc/partitions", "r");
548	>	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
549	>	}
550	>	if (f == NULL) goto out;
551	>	now = time(NULL);
552	>
553	>	while ((line_ptr = f_read_line(f, "")) != NULL) {
554	>	char name[100];
555	>	char *s;
556	>	long long rsect, wsect;
557	>
558	>	int nr = sscanf(line_ptr, format,
559	>	&major, &minor, name, &rsect, &wsect);
560	>	if (nr < 3) continue;
561	>
562	>	/* Skip device names ending in numbers, since they're
563	>	partitions. */
564	>	s = name;
565	>	while (*s != '\0') s++;
566	>	--s;
567	>	if (*s >= '0' && *s <= '9') continue;
568	>
569	>	if (nr < 5) {
570	>	has_pp_stats = 0;
571	>	rsect = 0;
572	>	wsect = 0;
573	>	}
574	>
575	>	if (VECTOR_RESIZE(diskio_stats, n + 1) < 0) {
576	>	goto out;
577	>	}
578	>	if (n >= alloc_parts) {
579	>	alloc_parts += 16;
580	>	parts = realloc(parts, alloc_parts * sizeof *parts);
581	>	if (parts == NULL) {
582	>	alloc_parts = 0;
583	>	goto out;
584	>	}
585	>	}
586	>
587	>	if (diskio_stats[n].disk_name != NULL)
588	>	free(diskio_stats[n].disk_name);
589	>	diskio_stats[n].disk_name = strdup(name);
590	>	diskio_stats[n].read_bytes = rsect * 512;
591	>	diskio_stats[n].write_bytes = wsect * 512;
592	>	diskio_stats[n].systime = now;
593	>	parts[n].major = major;
594	>	parts[n].minor = minor;
595	>
596	>	n++;
597	>	}
598	>
599	>	fclose(f);
600	>	f = NULL;
601	>
602	>	if (!has_pp_stats) {
603	>	/* This is an older kernel where /proc/partitions doesn't
604	>	contain stats. Read what we can from /proc/stat instead, and
605	>	fill in the appropriate bits of the list allocated above. */
606	>
607	>	f = fopen("/proc/stat", "r");
608	>	if (f == NULL) goto out;
609	>	now = time(NULL);
610	>
611	>	line_ptr = f_read_line(f, "disk_io:");
612	>	if (line_ptr == NULL) goto out;
613	>
614	>	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
615	>	long long rsect, wsect;
616	>
617	>	if (*++line_ptr == '\0') break;
618	>
619	>	if((sscanf(line_ptr,
620	>	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
621	>	&major, &minor, &rsect, &wsect)) != 4) {
622	>	continue;
623	>	}
624	>
625	>	/* Find the corresponding device from earlier.
626	>	Just to add to the fun, "minor" is actually the disk
627	>	number, not the device minor, so we need to figure
628	>	out the real minor number based on the major!
629	>	This list is not exhaustive; if you're running
630	>	an older kernel you probably don't have fancy
631	>	I2O hardware anyway... */
632	>	switch (major) {
633	>	case 3:
634	>	case 21:
635	>	case 22:
636	>	case 33:
637	>	case 34:
638	>	case 36:
639	>	case 56:
640	>	case 57:
641	>	case 88:
642	>	case 89:
643	>	case 90:
644	>	case 91:
645	>	minor *= 64;
646	>	break;
647	>	case 9:
648	>	case 43:
649	>	break;
650	>	default:
651	>	minor *= 16;
652	>	break;
653	>	}
654	>	for (i = 0; i < n; i++) {
655	>	if (major == parts[i].major
656	>	&& minor == parts[i].minor)
657	>	break;
658	>	}
659	>	if (i == n) continue;
660	>
661	>	/* We read the number of blocks. Blocks are stored in
662	>	512 bytes */
663	>	diskio_stats[i].read_bytes = rsect * 512;
664	>	diskio_stats[i].write_bytes = wsect * 512;
665	>	diskio_stats[i].systime = now;
666	>	}
667	>	}
668	>
669	>	num_diskio = n;
670	>	out:
671	>	if (f != NULL) fclose(f);
672	>	#endif
673	>
674	>	#ifdef CYGWIN
675		return NULL;
676	+	#endif
677	+
678	+	*entries=num_diskio;
679	+
680	+	return diskio_stats;
681		}
682	+
683	+	diskio_stat_t *get_diskio_stats_diff(int *entries){
684	+	VECTOR_DECLARE_STATIC(diff, diskio_stat_t, 1,
685	+	diskio_stat_init, diskio_stat_destroy);
686	+	diskio_stat_t *src = NULL, *dest;
687	+	int i, j, diff_count, new_count;
688	+
689	+	if (diskio_stats == NULL) {
690	+	/* No previous stats, so we can't calculate a difference. */
691	+	return get_diskio_stats(entries);
692	+	}
693	+
694	+	/* Resize the results array to match the previous stats. */
695	+	diff_count = VECTOR_SIZE(diskio_stats);
696	+	if (VECTOR_RESIZE(diff, diff_count) < 0) {
697	+	return NULL;
698	+	}
699	+
700	+	/* Copy the previous stats into the result. */
701	+	for (i = 0; i < diff_count; i++) {
702	+	src = &diskio_stats[i];
703	+	dest = &diff[i];
704	+
705	+	if (dest->disk_name != NULL) {
706	+	free(dest->disk_name);
707	+	}
708	+	dest->disk_name = strdup(src->disk_name);
709	+	dest->read_bytes = src->read_bytes;
710	+	dest->write_bytes = src->write_bytes;
711	+	dest->systime = src->systime;
712	+	}
713	+
714	+	/* Get a new set of stats. */
715	+	if (get_diskio_stats(&new_count) == NULL) {
716	+	return NULL;
717	+	}
718	+
719	+	/* For each previous stat... */
720	+	for (i = 0; i < diff_count; i++) {
721	+	dest = &diff[i];
722	+
723	+	/* ... find the corresponding new stat ... */
724	+	for (j = 0; j < new_count; j++) {
725	+	/* Try the new stat in the same position first,
726	+	since that's most likely to be it. */
727	+	src = &diskio_stats[(i + j) % new_count];
728	+	if (strcmp(src->disk_name, dest->disk_name) == 0) {
729	+	break;
730	+	}
731	+	}
732	+	if (j == new_count) {
733	+	/* No match found. */
734	+	continue;
735	+	}
736	+
737	+	/* ... and subtract the previous stat from it to get the
738	+	difference. */
739	+	dest->read_bytes = src->read_bytes - dest->read_bytes;
740	+	dest->write_bytes = src->write_bytes - dest->write_bytes;
741	+	dest->systime = src->systime - dest->systime;
742	+	}
743	+
744	+	*entries = diff_count;
745	+	return diff;
746	+	}
747	+

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