Monitor the number of opened files in the nagios Agent System

Monitor the number of opened files in the nagios Agent System

Vi check_open_file.c (for linux only)

#include 
 
  #include 
  
   #include 
   
    #define OK       0#define WARNING  1#define CRITICAL 2#define UNKNOWN  3#define LEN 1000#define FILE_NR "/proc/sys/fs/file-nr"int exitstatus=OK;char *exit_status[4]={"OK","WARNING","CRITICAL","UNKNOWN"};char status_information[LEN];char performance_data[LEN];int parse_cmd() {        int ret=0;        FILE *fp;        char readbuf[LEN];        int i;        char *p,*str;        float used_percent=0;        char used_handle[LEN]={0},free_handle[LEN]={0},max_handle[LEN]={0};        fp=fopen(FILE_NR,"r");        if(fp==NULL) {        //      fprintf(stderr,"fopen() error.\n");                sprintf(status_information,"File not exist, used_handle=%s max_handle=%s used_percent=%.0f%%","0","0",used_percent*100);                sprintf(performance_data,"used_handle=%s;;;; max_handle=%s;;;; used_percent=%.0f%%;30;50;;","0","0",used_percent*100);                exitstatus=CRITICAL;                printf("%s: %s | %s\n",exit_status[exitstatus],status_information,performance_data);                exit(exitstatus);        }        str=fgets(readbuf,LEN,fp);        if(str==NULL) {                fprintf(stderr,"fgets() error.\n");                return -1;        }//      printf("readbuf=%s",readbuf);        ret=sscanf(readbuf,"%s\t%s\t%s",used_handle,free_handle,max_handle);//      printf("sscanf ret=%d\n",ret);//      printf("used_handle=%s,free_handle=%s,max_handle=%s\n",used_handle,free_handle,max_handle);        used_percent=(float)(atoi(used_handle)/(float)atoi(max_handle));//      printf("used_percent=%f\n",used_percent);//      printf("used_percent=%.0f\n",used_percent*100);        if(used_percent>=0 && used_percent<30) {                exitstatus=OK;          }        else if(used_percent>=30 && used_percent<50) {                exitstatus=WARNING;             }        else if(used_percent>=50 && used_percent<=100) {                exitstatus=CRITICAL;        }        else {                exitstatus=CRITICAL;        }        sprintf(status_information,"used_handle=%s max_handle=%s used_percent=%.0f%%",used_handle,max_handle,used_percent*100);        sprintf(performance_data,"used_handle=%s;;;; max_handle=%s;;;; used_percent=%.0f%%;30;50;;",used_handle,max_handle,used_percent*100);        ret=fclose(fp);        if(ret==EOF) {                fprintf(stderr,"fclose() error.\n");                return -1;        }       // while(fgets(readbuf,1024,fp)!=NULL) {                /*                for(p=strtok(readbuf," ");p;p=strtok(NULL," ")) {                //      str=p;                        sprintf(status_information,"active call=%s",p);                        sprintf(performance_data,"call=%s;;;;",p);                        break;                }                break;                */        return 0;}int main() {        int ret;        ret=parse_cmd();        if(ret!=0) {                fprintf(stderr,"parse_cmd() error.\n");               // exitstatus=CRITICAL;               // printf("%s: - %s | %s\n",exit_status[exitstatus],status_information,performance_data);        //      exit(-1);        }        printf("%s: %s | %s\n",exit_status[exitstatus],status_information,performance_data);        return exitstatus;}