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/* $Id: plugin_netdev.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_netdev.c $
*
* plugin for /proc/net/dev parsing
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 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.
*
*/
/*
* exported functions:
*
* int plugin_init_netdev (void)
* adds functions to access /proc/net/dev
*
*/
#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 NetDev;
static FILE *Stream = NULL;
static char *DELIMITER = " :|\t\n";
static int parse_netdev(void)
{
int age;
int row, col;
static int first_time = 1;
/* reread every 10 msec only */
age = hash_age(&NetDev, NULL);
if (age > 0 && age <= 10)
return 0;
if (Stream == NULL)
Stream = fopen("/proc/net/dev", "r");
if (Stream == NULL) {
error("fopen(/proc/net/dev) failed: %s", strerror(errno));
return -1;
}
rewind(Stream);
row = 0;
while (!feof(Stream)) {
char buffer[256];
char dev[16];
char *beg, *end;
unsigned int len;
if (fgets(buffer, sizeof(buffer), Stream) == NULL)
break;
switch (++row) {
case 1:
/* skip row 1 */
continue;
case 2:
/* row 2 used for headers */
if (first_time) {
char *RxTx = strrchr(buffer, '|');
first_time = 0;
col = 0;
beg = buffer;
while (beg) {
char key[32];
while (strchr(DELIMITER, *beg))
beg++;
if ((end = strpbrk(beg, DELIMITER)) != NULL)
*end = '\0';
qprintf(key, sizeof(key), "%s_%s", beg < RxTx ? "Rx" : "Tx", beg);
hash_set_column(&NetDev, col++, key);
beg = end ? end + 1 : NULL;
}
}
continue;
default:
/* fetch interface name (1st column) as key */
beg = buffer;
while (*beg && *beg == ' ')
beg++;
end = beg + 1;
while (*end && *end != ':')
end++;
len = end - beg;
if (len >= sizeof(dev))
len = sizeof(dev) - 1;
strncpy(dev, beg, len);
dev[len] = '\0';
hash_put_delta(&NetDev, dev, buffer);
}
}
return 0;
}
static void my_netdev(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3)
{
char *dev, *key;
int delay;
double value;
if (parse_netdev() < 0) {
SetResult(&result, R_STRING, "");
return;
}
dev = R2S(arg1);
key = R2S(arg2);
delay = R2N(arg3);
value = hash_get_regex(&NetDev, dev, key, delay);
SetResult(&result, R_NUMBER, &value);
}
static void my_netdev_fast(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT * arg3)
{
char *dev, *key;
int delay;
double value;
if (parse_netdev() < 0) {
SetResult(&result, R_STRING, "");
return;
}
dev = R2S(arg1);
key = R2S(arg2);
delay = R2N(arg3);
value = hash_get_delta(&NetDev, dev, key, delay);
SetResult(&result, R_NUMBER, &value);
}
int plugin_init_netdev(void)
{
hash_create(&NetDev);
hash_set_delimiter(&NetDev, " :|\t\n");
AddFunction("netdev", 3, my_netdev);
AddFunction("netdev::fast", 3, my_netdev_fast);
return 0;
}
void plugin_exit_netdev(void)
{
if (Stream != NULL) {
fclose(Stream);
Stream = NULL;
}
hash_destroy(&NetDev);
}
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