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Diffstat (limited to '')
-rw-r--r-- | plugin_diskstats.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/plugin_diskstats.c b/plugin_diskstats.c new file mode 100644 index 0000000..a48f00f --- /dev/null +++ b/plugin_diskstats.c @@ -0,0 +1,161 @@ +/* $Id: plugin_diskstats.c,v 1.1 2004/05/29 00:27:23 reinelt Exp $ + * + * plugin for /proc/diskstats parsing + * + * Copyright 2003 Michael Reinelt <reinelt@eunet.at> + * Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * This file is part of LCD4Linux. + * + * LCD4Linux is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * LCD4Linux is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * + * $Log: plugin_diskstats.c,v $ + * Revision 1.1 2004/05/29 00:27:23 reinelt + * + * added plugin_diskstats.c + * + */ + +/* + * exported functions: + * + * int plugin_init_diskstats (void) + * adds functions to access /proc/stat + * + */ + + +#include "config.h" + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <ctype.h> +#include <errno.h> + +#include "debug.h" +#include "plugin.h" +#include "qprintf.h" +#include "hash.h" + + +static HASH DISKSTATS = { 0, }; +static FILE *stream = NULL; + + +static void hash_set2 (char *key1, char *key2, char *val) +{ + char key[32]; + + qprintf(key, sizeof(key), "%s.%s", key1, key2); + hash_set_delta (&DISKSTATS, key, val); +} + + +static int parse_diskstats (void) +{ + int age; + + // reread every 10 msec only + age = hash_age(&DISKSTATS, NULL, NULL); + if (age > 0 && age <= 10) return 0; + + if (stream == NULL) stream = fopen("/proc/diskstats", "r"); + if (stream == NULL) { + error ("fopen(/proc/diskstats) failed: %s", strerror(errno)); + return -1; + } + + rewind(stream); + + while (!feof(stream)) { + char buffer[1024]; + char *beg, *end; + char *major = NULL; + char *minor = NULL; + char *name = NULL; + char *key[] = { "reads", "read_merges", "read_sectors", "read_ticks", + "writes", "write_merges", "write_sectors", "write_ticks", + "in_flight", "io_ticks", "time_in_queue" + }; + + int i; + + if (fgets (buffer, sizeof(buffer), stream) == NULL) break; + + beg = buffer; + i = 0; + while (beg != NULL) { + while (*beg == ' ') beg++; + if ((end = strchr(beg, ' '))) *end = '\0'; + switch (i++) { + case 0: + major = beg; + break; + case 1: + minor = beg; + break; + case 2: + name = beg; + hash_set2 ("major", name, major); + hash_set2 ("minor", name, minor); + break; + default: + hash_set2 (key[i-3], name, beg); + } + beg = end ? end+1 : NULL; + } + } + return 0; +} + + +static void my_diskstats (RESULT *result, RESULT *arg1, RESULT *arg2, RESULT *arg3) +{ + char *dev, *key, buffer[32]; + int delay; + double value; + + if (parse_diskstats() < 0) { + SetResult(&result, R_STRING, ""); + return; + } + + dev = R2S(arg1); + key = R2S(arg2); + delay = R2N(arg3); + + qprintf(buffer, sizeof(buffer), "%s\\.%s", dev, key); + value = hash_get_regex(&DISKSTATS, buffer, delay); + + SetResult(&result, R_NUMBER, &value); +} + + +int plugin_init_diskstats (void) +{ + AddFunction ("diskstats", 3, my_diskstats); + return 0; +} + +void plugin_exit_diskstats(void) +{ + if (stream != NULL) { + fclose (stream); + stream = NULL; + } + hash_destroy(&DISKSTATS); +} |