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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 1.76 by ats, Sat Nov 6 15:33:40 2004 UTC

#	Line 1 | Line 1
1	<	/*
2	<	* i-scream central monitoring system
3	<	* http://www.i-scream.org.uk
4	<	* Copyright (C) 2000-2002 i-scream
1	>	/*
2	>	* i-scream libstatgrab
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	+	#include "tools.h"
35
36		#ifdef SOLARIS
37		#include <sys/mnttab.h>
32	–	#include <sys/types.h>
38		#include <sys/statvfs.h>
39	+	#include <kstat.h>
40	+	#define VALID_FS_TYPES {"ufs", "tmpfs", "vxfs"}
41	+	#endif
42
43	<	#define VALID_FS_TYPES {"ufs", "tmpfs"}
43	>	#if defined(LINUX) || defined(CYGWIN)
44	>	#include <mntent.h>
45	>	#include <sys/vfs.h>
46	>	#endif
47
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	<	#define START_VAL 1
56	>	#ifdef CYGWIN
57	>	#define VALID_FS_TYPES {"user"}
58	>	#endif
59
60	<	char *copy_string(char *orig_ptr, const char *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	<	/* Maybe free if not NULL, and strdup rather than realloc and strcpy? */
80	<	orig_ptr=realloc(orig_ptr, (1+strlen(newtext)));
81	<	if(orig_ptr==NULL){
82	<	return NULL;
83	<	}
84	<	strcpy(orig_ptr, newtext);
79	>	#ifdef HPUX
80	>	#include <sys/param.h>
81	>	#include <sys/pstat.h>
82	>	#include <sys/types.h>
83	>	#include <sys/stat.h>
84	>	#include <sys/vfs.h>
85	>	#include <mntent.h>
86	>	#include <dirent.h>
87	>	#include <stdio.h>
88	>	#include <time.h>
89	>	#define VALID_FS_TYPES {"vxfs", "hfs"}
90	>	#define DISK_BATCH 30
91	>	#endif
92
93	<	return orig_ptr;
93	>	static void disk_stat_init(sg_fs_stats *d) {
94	>	d->device_name = NULL;
95	>	d->fs_type = NULL;
96	>	d->mnt_point = NULL;
97		}
98
99	+	static void disk_stat_destroy(sg_fs_stats *d) {
100	+	free(d->device_name);
101	+	free(d->fs_type);
102	+	free(d->mnt_point);
103	+	}
104
105	<	void init_disk_stat(int start, int end, disk_stat_t *disk_stats){
105	>	static int is_valid_fs_type(const char *type) {
106	>	const char *types[] = VALID_FS_TYPES;
107	>	int i;
108
109	<	for(disk_stats+=start; start<=end; start++){
110	<	disk_stats->device_name=NULL;
111	<	disk_stats->fs_type=NULL;
112	<	disk_stats->mnt_point=NULL;
60	<
61	<	disk_stats++;
109	>	for (i = 0; i < (sizeof types / sizeof *types); i++) {
110	>	if (strcmp(types[i], type) == 0) {
111	>	return 1;
112	>	}
113		}
114	<
114	>	return 0;
115		}
116
117	<	disk_stat_t *get_disk_stats(int *entries){
117	>	sg_fs_stats *sg_get_fs_stats(int *entries){
118	>	VECTOR_DECLARE_STATIC(disk_stats, sg_fs_stats, 10,
119	>	disk_stat_init, disk_stat_destroy);
120
121	<	static disk_stat_t *disk_stats;
122	<	static int watermark=-1;
121	>	int valid_type;
122	>	int num_disks=0;
123	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN) || defined(HPUX)
124	>	FILE *f;
125	>	#endif
126
127	<	char *fs_types[] = VALID_FS_TYPES;
72	<	int x, valid_type;
127	>	sg_fs_stats *disk_ptr;
128
129	<	int num_disks=0;
129	>	#ifdef SOLARIS
130		struct mnttab mp;
131		struct statvfs fs;
132	<	FILE *f;
132	>	#endif
133	>	#if defined(LINUX) || defined(CYGWIN) || defined(HPUX)
134	>	struct mntent *mp;
135	>	struct statfs fs;
136	>	#endif
137	>	#ifdef ALLBSD
138	>	int nummnt;
139	>	#ifdef HAVE_STATVFS
140	>	struct statvfs *mp;
141	>	#else
142	>	struct statfs *mp;
143	>	#endif
144	>	#endif
145
146	<	disk_stat_t *disk_ptr;
146	>	#ifdef ALLBSD
147	>	nummnt=getmntinfo(&mp , MNT_LOCAL);
148	>	if (nummnt<=0){
149	>	sg_set_error_with_errno(SG_ERROR_GETMNTINFO, NULL);
150	>	return NULL;
151	>	}
152	>	for(;nummnt--; mp++){
153	>	valid_type = is_valid_fs_type(mp->f_fstypename);
154	>	#endif
155
156	<	if(watermark==-1){
157	<	disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
158	<	if(disk_stats==NULL){
159	<	return NULL;
160	<	}
161	<	watermark=START_VAL;
162	<	init_disk_stat(0, watermark-1, disk_stats);
156	>	#if defined(LINUX) || defined(CYGWIN) || defined(HPUX)
157	>	#ifdef MNT_MNTTAB
158	>	if ((f=setmntent(MNT_MNTTAB, "r" ))==NULL){
159	>	#else
160	>	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
161	>	#endif
162	>	sg_set_error(SG_ERROR_SETMNTENT, NULL);
163	>	return NULL;
164		}
165
166	+	while((mp=getmntent(f))){
167	+	if((statfs(mp->mnt_dir, &fs)) !=0){
168	+	continue;
169	+	}
170
171	+	valid_type = is_valid_fs_type(mp->mnt_type);
172	+	#endif
173	+
174	+	#ifdef SOLARIS
175		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
176	+	sg_set_error_with_errno(SG_ERROR_OPEN, "/etc/mnttab");
177		return NULL;
178		}
179		while((getmntent(f, &mp)) == 0){
180		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
181		continue;
182		}
183	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
184	+	#endif
185
186	<	valid_type=0;
187	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
188	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
102	<	valid_type=1;
103	<	break;
186	>	if(valid_type){
187	>	if (VECTOR_RESIZE(disk_stats, num_disks + 1) < 0) {
188	>	return NULL;
189		}
190	<	}
190	>	disk_ptr=disk_stats+num_disks;
191
192	<	if(valid_type){
193	<	if(num_disks>watermark-1){
194	<	disk_ptr=disk_stats;
195	<	if((disk_stats=realloc(disk_stats, (watermark*2 * sizeof(disk_stat_t))))==NULL){
196	<	disk_stats=disk_ptr;
197	<	return NULL;
198	<	}
192	>	#ifdef ALLBSD
193	>	if (sg_update_string(&disk_ptr->device_name, mp->f_mntfromname) < 0) {
194	>	return NULL;
195	>	}
196	>	if (sg_update_string(&disk_ptr->fs_type, mp->f_fstypename) < 0) {
197	>	return NULL;
198	>	}
199	>	if (sg_update_string(&disk_ptr->mnt_point, mp->f_mntonname) < 0) {
200	>	return NULL;
201	>	}
202
203	<	watermark=watermark*2;
204	<	init_disk_stat(num_disks, watermark-1, disk_stats);
203	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
204	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
205	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
206	>
207	>	disk_ptr->total_inodes=(long long)mp->f_files;
208	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
209	>	/* Freebsd doesn't have a "available" inodes */
210	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
211	>	#endif
212	>	#if defined(LINUX) || defined(CYGWIN) || defined(HPUX)
213	>	if (sg_update_string(&disk_ptr->device_name, mp->mnt_fsname) < 0) {
214	>	return NULL;
215		}
216	+
217	+	if (sg_update_string(&disk_ptr->fs_type, mp->mnt_type) < 0) {
218	+	return NULL;
219	+	}
220
221	<	disk_ptr=disk_stats+num_disks;
222	<
223	<	/* Memory leak in event of realloc failing */
221	>	if (sg_update_string(&disk_ptr->mnt_point, mp->mnt_dir) < 0) {
222	>	return NULL;
223	>	}
224	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
225	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
226	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
227	>
228	>	disk_ptr->total_inodes=(long long)fs.f_files;
229	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
230	>	/* Linux doesn't have a "available" inodes */
231	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
232	>	#endif
233	>
234	>	#ifdef SOLARIS
235		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
236	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
237	<	of a k each */
238	<	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
236	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
237	>	* be upwards of a k each
238	>	*/
239	>	if (sg_update_string(&disk_ptr->device_name, mp.mnt_special) < 0) {
240		return NULL;
241		}
242
243	<	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp.mnt_fstype))==NULL){
244	<	return NULL;
245	<	}
243	>	if (sg_update_string(&disk_ptr->fs_type, mp.mnt_fstype) < 0) {
244	>	return NULL;
245	>	}
246
247	<	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp.mnt_mountp))==NULL){
248	<	return NULL;
249	<	}
247	>	if (sg_update_string(&disk_ptr->mnt_point, mp.mnt_mountp) < 0) {
248	>	return NULL;
249	>	}
250
251		disk_ptr->size = (long long)fs.f_frsize * (long long)fs.f_blocks;
252		disk_ptr->avail = (long long)fs.f_frsize * (long long)fs.f_bavail;
#	Line 141 | Line 255 | disk_stat_t *get_disk_stats(int *entries){
255		disk_ptr->total_inodes=(long long)fs.f_files;
256		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
257		disk_ptr->free_inodes=(long long)fs.f_favail;
258	<
258	>	#endif
259		num_disks++;
260		}
261		}
262
263		*entries=num_disks;
264
265	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
265	>	/* If this fails, there is very little i can do about it, so
266	>	I'll ignore it :) */
267	>	#if defined(LINUX) || defined(CYGWIN) || defined(HPUX)
268	>	endmntent(f);
269	>	#endif
270	>	#if defined(SOLARIS)
271		fclose(f);
272	+	#endif
273
274		return disk_stats;
275
276		}
277
278	<	diskio_stat_t *get_diskio_stats(int *entries){
278	>	int sg_fs_compare_device_name(const void *va, const void *vb) {
279	>	const sg_fs_stats *a = (const sg_fs_stats *)va;
280	>	const sg_fs_stats *b = (const sg_fs_stats *)vb;
281
282	<	/* Do jibble */
282	>	return strcmp(a->device_name, b->device_name);
283	>	}
284	>
285	>	int sg_fs_compare_mnt_point(const void *va, const void *vb) {
286	>	const sg_fs_stats *a = (const sg_fs_stats *)va;
287	>	const sg_fs_stats *b = (const sg_fs_stats *)vb;
288	>
289	>	return strcmp(a->mnt_point, b->mnt_point);
290	>	}
291	>
292	>	static void diskio_stat_init(sg_disk_io_stats *d) {
293	>	d->disk_name = NULL;
294	>	}
295	>
296	>	static void diskio_stat_destroy(sg_disk_io_stats *d) {
297	>	free(d->disk_name);
298	>	}
299	>
300	>	VECTOR_DECLARE_STATIC(diskio_stats, sg_disk_io_stats, 10,
301	>	diskio_stat_init, diskio_stat_destroy);
302	>
303	>	#ifdef LINUX
304	>	typedef struct {
305	>	int major;
306	>	int minor;
307	>	} partition;
308	>	#endif
309	>
310	>	sg_disk_io_stats *sg_get_disk_io_stats(int *entries){
311	>	int num_diskio;
312	>	#ifndef LINUX
313	>	sg_disk_io_stats *diskio_stats_ptr;
314	>	#endif
315	>
316	>	#ifdef HPUX
317	>	long long rbytes = 0, wbytes = 0;
318	>	struct dirent *dinfo = NULL;
319	>	struct stat lstatinfo;
320	>	struct pst_diskinfo pstat_diskinfo[DISK_BATCH];
321	>	char fullpathbuf[1024] = {0};
322	>	dev_t diskid;
323	>	DIR *dh = NULL;
324	>	int diskidx = 0;
325	>	int num, i;
326	>	#endif
327	>	#ifdef SOLARIS
328	>	kstat_ctl_t *kc;
329	>	kstat_t *ksp;
330	>	kstat_io_t kios;
331	>	#endif
332	>	#ifdef LINUX
333	>	FILE *f;
334	>	char *line_ptr;
335	>	int major, minor;
336	>	int has_pp_stats = 1;
337	>	VECTOR_DECLARE_STATIC(parts, partition, 16, NULL, NULL);
338	>	int i, n;
339	>	time_t now;
340	>	const char *format;
341	>	#endif
342	>	#if defined(FREEBSD) || defined(DFBSD)
343	>	static struct statinfo stats;
344	>	static int stats_init = 0;
345	>	int counter;
346	>	struct device_selection *dev_sel = NULL;
347	>	int n_selected, n_selections;
348	>	long sel_gen;
349	>	struct devstat *dev_ptr;
350	>	#endif
351	>	#ifdef NETBSD
352	>	struct disk_sysctl *stats;
353	>	#endif
354	>	#ifdef OPENBSD
355	>	int diskcount;
356	>	char *disknames, *name, *bufpp;
357	>	char **dk_name;
358	>	struct diskstats *stats;
359	>	#endif
360	>	#ifdef NETBSD
361	>	#define MIBSIZE 3
362	>	#endif
363	>	#ifdef OPENBSD
364	>	#define MIBSIZE 2
365	>	#endif
366	>	#if defined(NETBSD) || defined(OPENBSD)
367	>	int num_disks, i;
368	>	int mib[MIBSIZE];
369	>	size_t size;
370	>	#endif
371	>
372	>	num_diskio=0;
373	>
374	>	#ifdef HPUX
375	>	while (1) {
376	>	num = pstat_getdisk(pstat_diskinfo, sizeof pstat_diskinfo[0],
377	>	DISK_BATCH, diskidx);
378	>	if (num == -1) {
379	>	sg_set_error_with_errno(SG_ERROR_PSTAT,
380	>	"pstat_getdisk");
381	>	return NULL;
382	>	} else if (num == 0) {
383	>	break;
384	>	}
385	>
386	>	for (i = 0; i < num; i++) {
387	>	struct pst_diskinfo *di = &pstat_diskinfo[i];
388	>
389	>	/* Skip "disabled" disks. */
390	>	if (di->psd_status == 0) {
391	>	continue;
392	>	}
393	>
394	>	/* We can't seperate the reads from the writes, we'll
395	>	just give the same to each. */
396	>	rbytes = wbytes = di->psd_dkwds / 2;
397	>
398	>	/* Skip unused disks. */
399	>	if (rbytes == 0 && wbytes == 0) {
400	>	continue;
401	>	}
402	>
403	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
404	>	return NULL;
405	>	}
406	>
407	>	diskio_stats_ptr = diskio_stats + num_diskio;
408	>
409	>	diskio_stats_ptr->read_bytes = rbytes;
410	>	diskio_stats_ptr->write_bytes = wbytes;
411	>
412	>	diskio_stats_ptr->systime = time(NULL);
413	>
414	>	num_diskio++;
415	>
416	>	if (diskio_stats_ptr->disk_name == NULL) {
417	>	dh = opendir("/dev/dsk");
418	>	if (dh == NULL) {
419	>	continue;
420	>	}
421	>
422	>	diskid = (di->psd_dev.psd_major << 24) | di->psd_dev.psd_minor;
423	>	while (1) {
424	>	dinfo = readdir(dh);
425	>	if (dinfo == NULL) {
426	>	break;
427	>	}
428	>	snprintf(fullpathbuf, sizeof(fullpathbuf), "/dev/dsk/%s", dinfo->d_name);
429	>	if (lstat(fullpathbuf, &lstatinfo) < 0) {
430	>	continue;
431	>	}
432	>
433	>	if (lstatinfo.st_rdev == diskid) {
434	>	if (sg_update_string(&diskio_stats_ptr->disk_name, dinfo->d_name) < 0) {
435	>	return NULL;
436	>	}
437	>	break;
438	>	}
439	>	}
440	>	closedir(dh);
441	>
442	>	if (diskio_stats_ptr->disk_name == NULL) {
443	>	if (sg_update_string(&diskio_stats_ptr->disk_name, di->psd_hw_path.psh_name) < 0) {
444	>	return NULL;
445	>	}
446	>	}
447	>	}
448	>	}
449	>	diskidx = pstat_diskinfo[num - 1].psd_idx + 1;
450	>	}
451	>	#endif
452	>	#ifdef OPENBSD
453	>	mib[0] = CTL_HW;
454	>	mib[1] = HW_DISKCOUNT;
455	>
456	>	size = sizeof(diskcount);
457	>	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
458	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKCOUNT");
459	>	return NULL;
460	>	}
461	>
462	>	mib[0] = CTL_HW;
463	>	mib[1] = HW_DISKNAMES;
464	>
465	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
466	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKNAMES");
467	>	return NULL;
468	>	}
469	>
470	>	disknames = sg_malloc(size);
471	>	if (disknames == NULL) {
472	>	return NULL;
473	>	}
474	>
475	>	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
476	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKNAMES");
477	>	return NULL;
478	>	}
479	>
480	>	dk_name = sg_malloc(diskcount * sizeof(char *));
481	>	bufpp = disknames;
482	>	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
483	>	dk_name[i] = name;
484	>	}
485	>	#endif
486	>
487	>	#if defined(NETBSD) || defined(OPENBSD)
488	>	mib[0] = CTL_HW;
489	>	mib[1] = HW_DISKSTATS;
490	>	#ifdef NETBSD
491	>	mib[2] = sizeof(struct disk_sysctl);
492	>	#endif
493	>
494	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
495	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKSTATS");
496	>	return NULL;
497	>	}
498	>
499	>	#ifdef NETBSD
500	>	num_disks = size / sizeof(struct disk_sysctl);
501	>	#else
502	>	num_disks = size / sizeof(struct diskstats);
503	>	#endif
504	>
505	>	stats = sg_malloc(size);
506	>	if (stats == NULL) {
507	>	return NULL;
508	>	}
509	>
510	>	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
511	>	sg_set_error_with_errno(SG_ERROR_SYSCTL, "CTL_HW.HW_DISKSTATS");
512	>	return NULL;
513	>	}
514	>
515	>	for (i = 0; i < num_disks; i++) {
516	>	const char *name;
517	>	u_int64_t rbytes, wbytes;
518	>
519	>	#ifdef NETBSD
520	>	#ifdef HAVE_DK_RBYTES
521	>	rbytes = stats[i].dk_rbytes;
522	>	wbytes = stats[i].dk_wbytes;
523	>	#else
524	>	/* Before 2.0, NetBSD merged reads and writes. */
525	>	rbytes = wbytes = stats[i].dk_bytes;
526	>	#endif
527	>	#else
528	>	#ifdef HAVE_DS_RBYTES
529	>	rbytes = stats[i].ds_rbytes;
530	>	wbytes = stats[i].ds_wbytes;
531	>	#else
532	>	/* Before 3.5, OpenBSD merged reads and writes */
533	>	rbytes = wbytes = stats[i].ds_bytes;
534	>	#endif
535	>	#endif
536	>
537	>	/* Don't keep stats for disks that have never been used. */
538	>	if (rbytes == 0 && wbytes == 0) {
539	>	continue;
540	>	}
541	>
542	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
543	>	return NULL;
544	>	}
545	>	diskio_stats_ptr = diskio_stats + num_diskio;
546	>
547	>	diskio_stats_ptr->read_bytes = rbytes;
548	>	diskio_stats_ptr->write_bytes = wbytes;
549	>	#ifdef NETBSD
550	>	name = stats[i].dk_name;
551	>	#else
552	>	name = dk_name[i];
553	>	#endif
554	>	if (sg_update_string(&diskio_stats_ptr->disk_name, name) < 0) {
555	>	return NULL;
556	>	}
557	>	diskio_stats_ptr->systime = time(NULL);
558	>
559	>	num_diskio++;
560	>	}
561	>
562	>	free(stats);
563	>	#ifdef OPENBSD
564	>	free(dk_name);
565	>	free(disknames);
566	>	#endif
567	>	#endif
568	>
569	>	#if defined(FREEBSD) || defined(DFBSD)
570	>	if (!stats_init) {
571	>	stats.dinfo=sg_malloc(sizeof(struct devinfo));
572	>	if(stats.dinfo==NULL) return NULL;
573	>	bzero(stats.dinfo, sizeof(struct devinfo));
574	>	stats_init = 1;
575	>	}
576	>	#ifdef FREEBSD5
577	>	if ((devstat_getdevs(NULL, &stats)) < 0) {
578	>	/* FIXME devstat functions return a string error in
579	>	devstat_errbuf */
580	>	sg_set_error(SG_ERROR_DEVSTAT_GETDEVS, NULL);
581	>	return NULL;
582	>	}
583	>	/* Not aware of a get all devices, so i said 999. If we ever
584	>	* find a machine with more than 999 disks, then i'll change
585	>	* this number :)
586	>	*/
587	>	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) {
588	>	sg_set_error(SG_ERROR_DEVSTAT_SELECTDEVS, NULL);
589	>	return NULL;
590	>	}
591	>	#else
592	>	if ((getdevs(&stats)) < 0) {
593	>	sg_set_error(SG_ERROR_DEVSTAT_GETDEVS, NULL);
594	>	return NULL;
595	>	}
596	>	/* Not aware of a get all devices, so i said 999. If we ever
597	>	* find a machine with more than 999 disks, then i'll change
598	>	* this number :)
599	>	*/
600	>	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) {
601	>	sg_set_error(SG_ERROR_DEVSTAT_SELECTDEVS, NULL);
602	>	return NULL;
603	>	}
604	>	#endif
605	>
606	>	for(counter=0;counter<stats.dinfo->numdevs;counter++){
607	>	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
608	>
609	>	/* Throw away devices that have done nothing, ever.. Eg "odd"
610	>	* devices.. like mem, proc.. and also doesn't report floppy
611	>	* drives etc unless they are doing stuff :)
612	>	*/
613	>	#ifdef FREEBSD5
614	>	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
615	>	#else
616	>	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
617	>	#endif
618	>
619	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
620	>	return NULL;
621	>	}
622	>	diskio_stats_ptr=diskio_stats+num_diskio;
623	>
624	>	#ifdef FREEBSD5
625	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
626	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
627	>	#else
628	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
629	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
630	>	#endif
631	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
632	>	if (asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number) == -1) {
633	>	sg_set_error_with_errno(SG_ERROR_ASPRINTF, NULL);
634	>	return NULL;
635	>	}
636	>	diskio_stats_ptr->systime=time(NULL);
637	>
638	>	num_diskio++;
639	>	}
640	>	free(dev_sel);
641	>
642	>	#endif
643	>	#ifdef SOLARIS
644	>	if ((kc = kstat_open()) == NULL) {
645	>	sg_set_error(SG_ERROR_KSTAT_OPEN, NULL);
646	>	return NULL;
647	>	}
648	>
649	>	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
650	>	if (!strcmp(ksp->ks_class, "disk")) {
651	>
652	>	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
653	>	/* We dont want metadevices appearins as num_diskio */
654	>	if(strcmp(ksp->ks_module, "md")==0) continue;
655	>	if((kstat_read(kc, ksp, &kios))==-1){
656	>	}
657	>
658	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
659	>	kstat_close(kc);
660	>	return NULL;
661	>	}
662	>	diskio_stats_ptr=diskio_stats+num_diskio;
663	>
664	>	diskio_stats_ptr->read_bytes=kios.nread;
665	>	diskio_stats_ptr->write_bytes=kios.nwritten;
666	>	if (sg_update_string(&diskio_stats_ptr->disk_name,
667	>	sg_get_svr_from_bsd(ksp->ks_name)) < 0) {
668	>	return NULL;
669	>	}
670	>	diskio_stats_ptr->systime=time(NULL);
671	>
672	>	num_diskio++;
673	>	}
674	>	}
675	>
676	>	kstat_close(kc);
677	>	#endif
678	>
679	>	#ifdef LINUX
680	>	num_diskio = 0;
681	>	n = 0;
682	>
683	>	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
684	>	have statistics in here too, so we can use those directly.
685	>	2.6 kernels have /proc/diskstats instead with almost (but not quite)
686	>	the same format. */
687	>
688	>	f = fopen("/proc/diskstats", "r");
689	>	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
690	>	if (f == NULL) {
691	>	f = fopen("/proc/partitions", "r");
692	>	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
693	>	}
694	>	if (f == NULL) goto out;
695	>	now = time(NULL);
696	>
697	>	while ((line_ptr = sg_f_read_line(f, "")) != NULL) {
698	>	char name[100];
699	>	char *s;
700	>	long long rsect, wsect;
701	>
702	>	int nr = sscanf(line_ptr, format,
703	>	&major, &minor, name, &rsect, &wsect);
704	>	if (nr < 3) continue;
705	>
706	>	/* Skip device names ending in numbers, since they're
707	>	partitions. */
708	>	s = name;
709	>	while (*s != '\0') s++;
710	>	--s;
711	>	if (*s >= '0' && *s <= '9') continue;
712	>
713	>	if (nr < 5) {
714	>	has_pp_stats = 0;
715	>	rsect = 0;
716	>	wsect = 0;
717	>	}
718	>
719	>	if (VECTOR_RESIZE(diskio_stats, n + 1) < 0) {
720	>	goto out;
721	>	}
722	>	if (VECTOR_RESIZE(parts, n + 1) < 0) {
723	>	goto out;
724	>	}
725	>
726	>	if (sg_update_string(&diskio_stats[n].disk_name, name) < 0) {
727	>	goto out;
728	>	}
729	>	diskio_stats[n].read_bytes = rsect * 512;
730	>	diskio_stats[n].write_bytes = wsect * 512;
731	>	diskio_stats[n].systime = now;
732	>	parts[n].major = major;
733	>	parts[n].minor = minor;
734	>
735	>	n++;
736	>	}
737	>
738	>	fclose(f);
739	>	f = NULL;
740	>
741	>	if (!has_pp_stats) {
742	>	/* This is an older kernel where /proc/partitions doesn't
743	>	contain stats. Read what we can from /proc/stat instead, and
744	>	fill in the appropriate bits of the list allocated above. */
745	>
746	>	f = fopen("/proc/stat", "r");
747	>	if (f == NULL) goto out;
748	>	now = time(NULL);
749	>
750	>	line_ptr = sg_f_read_line(f, "disk_io:");
751	>	if (line_ptr == NULL) goto out;
752	>
753	>	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
754	>	long long rsect, wsect;
755	>
756	>	if (*++line_ptr == '\0') break;
757	>
758	>	if((sscanf(line_ptr,
759	>	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
760	>	&major, &minor, &rsect, &wsect)) != 4) {
761	>	continue;
762	>	}
763	>
764	>	/* Find the corresponding device from earlier.
765	>	Just to add to the fun, "minor" is actually the disk
766	>	number, not the device minor, so we need to figure
767	>	out the real minor number based on the major!
768	>	This list is not exhaustive; if you're running
769	>	an older kernel you probably don't have fancy
770	>	I2O hardware anyway... */
771	>	switch (major) {
772	>	case 3:
773	>	case 21:
774	>	case 22:
775	>	case 33:
776	>	case 34:
777	>	case 36:
778	>	case 56:
779	>	case 57:
780	>	case 88:
781	>	case 89:
782	>	case 90:
783	>	case 91:
784	>	minor *= 64;
785	>	break;
786	>	case 9:
787	>	case 43:
788	>	break;
789	>	default:
790	>	minor *= 16;
791	>	break;
792	>	}
793	>	for (i = 0; i < n; i++) {
794	>	if (major == parts[i].major
795	>	&& minor == parts[i].minor)
796	>	break;
797	>	}
798	>	if (i == n) continue;
799	>
800	>	/* We read the number of blocks. Blocks are stored in
801	>	512 bytes */
802	>	diskio_stats[i].read_bytes = rsect * 512;
803	>	diskio_stats[i].write_bytes = wsect * 512;
804	>	diskio_stats[i].systime = now;
805	>	}
806	>	}
807	>
808	>	num_diskio = n;
809	>	out:
810	>	if (f != NULL) fclose(f);
811	>	#endif
812	>
813	>	#ifdef CYGWIN
814	>	sg_set_error(SG_ERROR_UNSUPPORTED, "Cygwin");
815		return NULL;
816	+	#endif
817	+
818	+	*entries=num_diskio;
819	+
820	+	return diskio_stats;
821		}
822	+
823	+	sg_disk_io_stats *sg_get_disk_io_stats_diff(int *entries){
824	+	VECTOR_DECLARE_STATIC(diff, sg_disk_io_stats, 1,
825	+	diskio_stat_init, diskio_stat_destroy);
826	+	sg_disk_io_stats *src = NULL, *dest;
827	+	int i, j, diff_count, new_count;
828	+
829	+	if (diskio_stats == NULL) {
830	+	/* No previous stats, so we can't calculate a difference. */
831	+	return sg_get_disk_io_stats(entries);
832	+	}
833	+
834	+	/* Resize the results array to match the previous stats. */
835	+	diff_count = VECTOR_SIZE(diskio_stats);
836	+	if (VECTOR_RESIZE(diff, diff_count) < 0) {
837	+	return NULL;
838	+	}
839	+
840	+	/* Copy the previous stats into the result. */
841	+	for (i = 0; i < diff_count; i++) {
842	+	src = &diskio_stats[i];
843	+	dest = &diff[i];
844	+
845	+	if (sg_update_string(&dest->disk_name, src->disk_name) < 0) {
846	+	return NULL;
847	+	}
848	+	dest->read_bytes = src->read_bytes;
849	+	dest->write_bytes = src->write_bytes;
850	+	dest->systime = src->systime;
851	+	}
852	+
853	+	/* Get a new set of stats. */
854	+	if (sg_get_disk_io_stats(&new_count) == NULL) {
855	+	return NULL;
856	+	}
857	+
858	+	/* For each previous stat... */
859	+	for (i = 0; i < diff_count; i++) {
860	+	dest = &diff[i];
861	+
862	+	/* ... find the corresponding new stat ... */
863	+	for (j = 0; j < new_count; j++) {
864	+	/* Try the new stat in the same position first,
865	+	since that's most likely to be it. */
866	+	src = &diskio_stats[(i + j) % new_count];
867	+	if (strcmp(src->disk_name, dest->disk_name) == 0) {
868	+	break;
869	+	}
870	+	}
871	+	if (j == new_count) {
872	+	/* No match found. */
873	+	continue;
874	+	}
875	+
876	+	/* ... and subtract the previous stat from it to get the
877	+	difference. */
878	+	dest->read_bytes = src->read_bytes - dest->read_bytes;
879	+	dest->write_bytes = src->write_bytes - dest->write_bytes;
880	+	dest->systime = src->systime - dest->systime;
881	+	}
882	+
883	+	*entries = diff_count;
884	+	return diff;
885	+	}
886	+
887	+	int sg_disk_io_compare_name(const void *va, const void *vb) {
888	+	const sg_disk_io_stats *a = (const sg_disk_io_stats *)va;
889	+	const sg_disk_io_stats *b = (const sg_disk_io_stats *)vb;
890	+
891	+	return strcmp(a->disk_name, b->disk_name);
892	+	}
893	+

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