mirror of
https://github.com/netfun2000/lcd4linux.git
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6d5d1055ea
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@840 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
156 lines
3.2 KiB
C
156 lines
3.2 KiB
C
/* $Id$
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* $URL$
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*
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* plugin for /proc/diskstats parsing
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*
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* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
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* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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*
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* This file is part of LCD4Linux.
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*
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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* exported functions:
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*
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* int plugin_init_diskstats (void)
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* adds functions to access /proc/stat
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*
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include "debug.h"
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#include "plugin.h"
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#include "hash.h"
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static HASH DISKSTATS;
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static FILE *stream = NULL;
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static int parse_diskstats(void)
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{
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int age;
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/* reread every 10 msec only */
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age = hash_age(&DISKSTATS, NULL);
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if (age > 0 && age <= 10)
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return 0;
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if (stream == NULL)
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stream = fopen("/proc/diskstats", "r");
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if (stream == NULL) {
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error("fopen(/proc/diskstats) failed: %s", strerror(errno));
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return -1;
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}
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rewind(stream);
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while (!feof(stream)) {
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char buffer[1024];
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char dev[64];
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char *beg, *end;
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unsigned int num, len;
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if (fgets(buffer, sizeof(buffer), stream) == NULL)
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break;
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/* fetch device name (3rd column) as key */
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num = 0;
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beg = buffer;
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end = beg;
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while (*beg) {
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while (*beg == ' ')
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beg++;
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end = beg + 1;
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while (*end && *end != ' ')
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end++;
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if (num++ == 2)
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break;
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beg = end ? end + 1 : NULL;
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}
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len = end ? (unsigned) (end - beg) : strlen(beg);
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if (len >= sizeof(dev))
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len = sizeof(dev) - 1;
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strncpy(dev, beg, len);
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dev[len] = '\0';
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hash_put_delta(&DISKSTATS, dev, buffer);
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}
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return 0;
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}
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static void my_diskstats(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3)
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{
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char *dev, *key;
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int delay;
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double value;
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if (parse_diskstats() < 0) {
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SetResult(&result, R_STRING, "");
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return;
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}
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dev = R2S(arg1);
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key = R2S(arg2);
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delay = R2N(arg3);
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value = hash_get_regex(&DISKSTATS, dev, key, delay);
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SetResult(&result, R_NUMBER, &value);
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}
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int plugin_init_diskstats(void)
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{
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int i;
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char *header[] = { "major", "minor", "name",
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"reads", "read_merges", "read_sectors", "read_ticks",
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"writes", "write_merges", "write_sectors", "write_ticks",
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"in_flight", "io_ticks", "time_in_queue", ""
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};
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hash_create(&DISKSTATS);
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hash_set_delimiter(&DISKSTATS, " \n");
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for (i = 0; *header[i] != '\0'; i++) {
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hash_set_column(&DISKSTATS, i, header[i]);
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}
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AddFunction("diskstats", 3, my_diskstats);
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return 0;
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}
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void plugin_exit_diskstats(void)
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{
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if (stream != NULL) {
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fclose(stream);
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stream = NULL;
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}
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hash_destroy(&DISKSTATS);
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}
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