nagios插件之系统打开文件数监控

最新推荐文章于 2025-12-04 13:11:19 发布

原创最新推荐文章于 2025-12-04 13:11:19 发布 · 940 阅读

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本文介绍了一个用于检查Linux系统中文件数量及评估其使用情况的C语言脚本。通过读取特定配置文件，脚本可以计算并报告当前使用的文件数、最大允许文件数以及使用百分比。根据使用情况，脚本会输出状态信息和性能数据，帮助用户了解系统资源使用状况。

vi check_open_file.c (仅限linux系统使用)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#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;
}