Below is my code which is showing warning of
ionline.c: In function 'handle_memory':
> ionline.c: warning: ignoring return value of 'system', declared
> with attribute warn_unused_result [-Wunused-result]
> ionline.c: warning: ignoring return value of 'fscanf', declared
> with attribute warn_unused_result [-Wunused-result]
Why it it not talking any function which is returning valuses?? Like system
call , fscanf etc..etc..
/****************************************************
root@ubuntu:/home/net-snmp/agent/mibgroup# net-snmp-config --compile-subagent
ionline ionline.c
root@ubuntu:/home/net-snmp/agent/mibgroup# ./ionline localhost &
-
****************************************************
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "ionline.h"
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include <sys/sysinfo.h>
unsigned long memoryCapacity = 10;
/*
* Our initialization routine, called automatically by the agent
* (Note that the function name must match init_FILENAME())
*/
void init_ionline(void)
{
netsnmp_handler_registration *reg;
int i;
const oid memoryPercentUsage _oid[] = { 1,3,6,1,4,1,21067,3,1 };
static netsnmp_watcher_info memoryPercentUsage _winfo;
FILE *pipe = NULL;
int j;
system("sh jatin.sh > jatin.txt");
pipe=fopen("jatin.txt", "r");
/*******************
After scanf function i would have a integer value between 1 to 100
**********************/
fscanf(pipe,"%d",&i);
DEBUGMSGTL(("ionline","Initializing memoryPercentUsage scalar integer. Default
value = %ld\n",memoryPercentUsage));
memoryPercentUsage=i;
netsnmp_register_read_only_counter32_instance("memoryPercentUsage",memoryPercentUsage_oid,
OID_LENGTH(memoryPercentUsage_oid),
&memoryPercentUsage,NULL);
reg = netsnmp_create_handler_registration("memoryPercentUsage",
NULL,memoryPercentUsage_oid,
OID_LENGTH(memoryPercentUsage_oid),HANDLER_CAN_RONLY);
netsnmp_init_watcher_info(&memoryPercentUsage_winfo,
&memoryPercentUsage, sizeof(u_long),
ASN_COUNTER, WATCHER_FIXED_SIZE);
if (netsnmp_register_watched_scalar( reg, &memoryPercentUsage_winfo ) <
0 )
{
snmp_log( LOG_ERR, "Failed to register watched
memoryPercentUsage" );
}
}
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