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/* $Id: plugin_netdev.c,v 1.10 2004/06/17 10:58:58 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 1.10 2004/06/17 10:58:58 reinelt
*
* changed plugin_netdev to use the new fast hash model
*
* Revision 1.9 2004/06/17 06:23:43 reinelt
*
* hash handling rewritten to solve performance issues
*
* Revision 1.8 2004/05/27 03:39:47 reinelt
*
* changed function naming scheme to plugin::function
*
* Revision 1.7 2004/03/11 06:39:59 reinelt
* big patch from Martin:
* - reuse filehandles
* - memory leaks fixed
* - earlier busy-flag checking with HD44780
* - reuse memory for strings in RESULT and hash
* - netdev_fast to wavid time-consuming regex
*
* Revision 1.6 2004/03/03 04:44:16 reinelt
* changes (cosmetics?) to the big patch from Martin
* hash patch un-applied
*
* Revision 1.5 2004/03/03 03:47:04 reinelt
* big patch from Martin Hejl:
* - use qprintf() where appropriate
* - save CPU cycles on gettimeofday()
* - add quit() functions to free allocated memory
* - fixed lots of memory leaks
*
* 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 "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;
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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