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- /* $Id: sm_io.c,v 1.3 2008/04/06 13:02:12 dijkstra Exp $ */
- /*
- * Copyright (c) 2001-2006 Willem Dijkstra
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- */
- /*
- * Get current disk statistics from kernel and return them in symon_buf as
- *
- * total_rxfer, total_wxfer, total_seeks, total_rbytes, total_wbytes
- *
- */
- #include <sys/param.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <string.h>
- #include <unistd.h>
- #include "conf.h"
- #include "xmalloc.h"
- #include "error.h"
- #include "symon.h"
- /* Globals for this module start with io_ */
- static void *io_buf = NULL;
- static int io_size = 0;
- static int io_maxsize = 0;
- struct io_device_stats
- {
- u_int64_t read_issued;
- u_int64_t read_merged;
- u_int64_t read_sectors;
- u_int64_t read_milliseconds;
- u_int64_t write_issued;
- u_int64_t write_merged;
- u_int64_t write_sectors;
- u_int64_t write_milliseconds;
- u_int64_t progress_ios;
- u_int64_t progress_milliseconds;
- u_int64_t progress_weight;
- };
- #ifdef HAS_PROC_DISKSTATS
- char *io_filename = "/proc/diskstats";
- #else
- #ifdef HAS_PROC_PARTITIONS
- char *io_filename = "/proc/partitions";
- #endif
- #endif
- #if defined(HAS_PROC_DISKSTATS) || defined(HAS_PROC_PARTITIONS)
- void
- init_io(struct stream *st)
- {
- if (io_buf == NULL) {
- io_maxsize = SYMON_MAX_OBJSIZE;
- io_buf = xmalloc(io_maxsize);
- }
- info("started module io(%.200s)", st->arg);
- }
- void
- gets_io()
- {
- int fd;
- if ((fd = open(io_filename, O_RDONLY)) < 0) {
- warning("cannot access %.200s: %.200s", io_filename, strerror(errno));
- return;
- }
- bzero(io_buf, io_maxsize);
- io_size = read(fd, io_buf, io_maxsize);
- close(fd);
- if (io_size == io_maxsize) {
- /* buffer is too small to hold all interface data */
- io_maxsize += SYMON_MAX_OBJSIZE;
- if (io_maxsize > SYMON_MAX_OBJSIZE * SYMON_MAX_DOBJECTS) {
- fatal("%s:%d: dynamic object limit (%d) exceeded for io data",
- __FILE__, __LINE__, SYMON_MAX_OBJSIZE * SYMON_MAX_DOBJECTS);
- }
- io_buf = xrealloc(io_buf, io_maxsize);
- gets_io();
- return;
- }
- if (io_size == -1) {
- warning("could not read io statistics from %.200s: %.200s", io_filename, strerror(errno));
- }
- }
- int
- get_io(char *symon_buf, int maxlen, struct stream *st)
- {
- char *line;
- struct io_device_stats stats;
- if (io_size <= 0) {
- return 0;
- }
- if ((line = strstr(io_buf, st->arg)) == NULL) {
- warning("could not find disk %s", st->arg);
- return 0;
- }
- line += strlen(st->arg);
- bzero(&stats, sizeof(struct io_device_stats));
- if (11 > sscanf(line, " %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
- &stats.read_issued, &stats.read_merged,
- &stats.read_sectors, &stats.read_milliseconds,
- &stats.write_issued, &stats.write_merged,
- &stats.write_sectors, &stats.write_milliseconds,
- &stats.progress_ios, &stats.progress_milliseconds,
- &stats.progress_weight)) {
- #ifdef HAS_PROC_DISKSTATS
- if (4 > sscanf(line, " %llu %llu %llu %llu\n",
- &stats.read_issued, &stats.read_sectors,
- &stats.write_issued, &stats.write_sectors)) {
- warning("could not parse disk statistics for %.200s", st->arg);
- return 0;
- }
- }
- #else
- warning("could not parse disk statistics for %.200s", st->arg);
- return 0;
- }
- #endif
- return snpack(symon_buf, maxlen, st->arg, MT_IO2,
- stats.read_issued,
- stats.write_issued,
- (u_int64_t) 0,
- (u_int64_t)(stats.read_sectors * DEV_BSIZE),
- (u_int64_t)(stats.write_sectors * DEV_BSIZE));
- }
- #else
- void
- init_io(struct stream *st)
- {
- fatal("io module not available");
- }
- void
- gets_io()
- {
- fatal("io module not available");
- }
- int
- get_io(char *symon_buf, int maxlen, struct stream *st)
- {
- fatal("io module not available");
- /* NOT REACHED */
- return 0;
- }
- #endif
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