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/* $Id: plugin_netdev.c,v 1.4 2004/02/15 07:23:04 reinelt Exp $
*
* plugin for /proc/net/dev 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_netdev.c,v $
* Revision 1.4 2004/02/15 07:23:04 reinelt
* bug in netdev parsing fixed
*
* Revision 1.3 2004/02/01 19:37:40 reinelt
* got rid of every strtok() incarnation.
*
* Revision 1.2 2004/01/29 04:40:02 reinelt
* every .c file includes "config.h" now
*
* Revision 1.1 2004/01/25 05:30:09 reinelt
* plugin_netdev for parsing /proc/net/dev added
*
*/
/*
* 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 "hash.h"
static HASH NetDev = { 0, };
static void hash_set3 (char *key1, char *key2, char *key3, char *val)
{
char key[32];
snprintf (key, sizeof(key), "%s.%s.%s", key1, key2, key3);
hash_set_delta (&NetDev, key, val);
}
static int parse_netdev (void)
{
int age;
int line;
int RxTx=0; // position of Receive/Transmit switch
FILE *stream;
// reread every 10 msec only
age=hash_age(&NetDev, NULL, NULL);
if (age>0 && age<=10) return 0;
stream=fopen("/proc/net/dev", "r");
if (stream==NULL) {
error ("fopen(/proc/net/dev) failed: %s", strerror(errno));
return -1;
}
line=0;
while (!feof(stream)) {
char buffer[256];
char header[256], *h, *t;
char *head[64];
char delim[]=" :|\t\n";
int col;
if (fgets (buffer, sizeof(buffer), stream) == NULL) break;
// skip line 1
if (++line<2) continue;
// line 2 used for headers
if (line==2) {
strncpy(header, buffer, sizeof(header));
RxTx=(strrchr(header, '|') - header);
col=0;
h=header;
while (h!=NULL) {
while (strchr(delim, *h)) h++;
if ((t=strpbrk(h, delim))!=NULL) *t='\0';
head[col++]=h;
h=t?t+1:NULL;
}
} else {
char *h, *iface=NULL;
col=0;
h=buffer;
while (h!=NULL) {
while (strchr(delim, *h)) h++;
if ((t=strpbrk(h, delim))!=NULL) *t='\0';
if (col==0) {
iface=h;
} else {
hash_set3 (iface, (h-buffer) < RxTx ? "Rx" : "Tx", head[col], h);
}
h=t?t+1:NULL;
col++;
}
}
}
fclose (stream);
return 0;
}
static void my_netdev (RESULT *result, RESULT *arg1, RESULT *arg2)
{
char *key;
int delay;
double value;
if (parse_netdev()<0) {
SetResult(&result, R_STRING, "");
return;
}
key = R2S(arg1);
delay = R2N(arg2);
value = hash_get_regex(&NetDev, key, delay);
SetResult(&result, R_NUMBER, &value);
}
int plugin_init_netdev (void)
{
AddFunction ("netdev", 2, my_netdev);
return 0;
}
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