代碼：
#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #define MAXBUFSIZE 1024 #define WAIT_SECOND 3 //暫停時間，單位為“秒” typedef struct occupy { char name[20]; unsigned int user; unsigned int nice; unsigned int system; unsigned int idle; } CPU_OCCUPY ; typedef struct PACKED { char name[20]; long total; char name2[20]; long free; }MEM_OCCUPY; float g_cpu_used; int cpu_num; //定義一個全局的int類型cup_num void cal_occupy(CPU_OCCUPY *, CPU_OCCUPY *); void get_occupy(CPU_OCCUPY *); void get_mem_occupy(MEM_OCCUPY *) ; float get_io_occupy(); void get_disk_occupy(char ** reused); void getCurrentDownloadRates(long int * save_rate); int main(){ CPU_OCCUPY ocpu,ncpu; MEM_OCCUPY mem; //獲取cpu核數 cpu_num = sysconf(_SC_NPROCESSORS_ONLN); printf("cpu mum:%d\n",cpu_num); //獲取cpu使用率 get_occupy(&ocpu); sleep(1); get_occupy(&ncpu); cal_occupy(&ocpu, &ncpu); printf("cpu used:%4.2f \n", g_cpu_used); //獲取內存使用率 get_mem_occupy(&mem); double using = ((double)(mem.total - mem.free)/mem.total)*100; printf("mem used:%4.2f\n",using); //獲取io使用率 printf("io used:%4.2f\n",get_io_occupy()); //獲取當前磁盤的使用率 char t[20]=""; char *used = t; get_disk_occupy(&used); //char used[20]=" " ; //get_disk_occupy((char **)&used); printf("disk used:%s\n",used); //網絡延遲 long int start_download_rates; //保存開始時的流量計數 long int end_download_rates; //保存結果時的流量計數 getCurrentDownloadRates(&start_download_rates);//獲取當前流量，並保存在start_download_rates里 sleep(WAIT_SECOND); //休眠多少秒，這個值根據宏定義中的WAIT_SECOND的值來確定 getCurrentDownloadRates(&end_download_rates);//獲取當前流量，並保存在end_download_rates里 printf("download is : %4.2f byte/s \n",( (float)(end_download_rates-start_download_rates))/WAIT_SECOND ); } void cal_occupy (CPU_OCCUPY *o, CPU_OCCUPY *n){ double od, nd; double id, sd; double scale; od = (double) (o->user + o->nice + o->system +o->idle);//第一次(用戶+優先級+系統+空閑)的時間再賦給od nd = (double) (n->user + n->nice + n->system +n->idle);//第二次(用戶+優先級+系統+空閑)的時間再賦給od scale = 100.0 / (float)(nd-od); //100除強制轉換(nd-od)之差為float類型再賦給scale這個變量 id = (double) (n->user - o->user); //用戶第一次和第二次的時間之差再賦給id sd = (double) (n->system - o->system);//系統第一次和第二次的時間之差再賦給sd g_cpu_used = ((sd+id)*100.0)/(nd-od); //((用戶+系統)乖100)除(第一次和第二次的時間差)再賦給g_cpu_used } void get_occupy (CPU_OCCUPY *o) { FILE *fd; int n; char buff[MAXBUFSIZE]; fd = fopen ("/proc/stat", "r"); //這里只讀取stat文件的第一行及cpu總信息，如需獲取每核cpu的使用情況，請分析stat文件的接下來幾行。 fgets (buff, sizeof(buff), fd); sscanf (buff, "%s %u %u %u %u", o->name, &o->user, &o->nice,&o->system, &o->idle); fclose(fd); } void get_mem_occupy(MEM_OCCUPY * mem){ FILE * fd; char buff[MAXBUFSIZE]; fd = fopen("/proc/meminfo","r"); fgets (buff, sizeof(buff), fd); sscanf (buff, "%s %ld", mem->name,&mem->total); fgets (buff, sizeof(buff), fd); sscanf (buff, "%s %ld", mem->name2,&mem->free); } float get_io_occupy(){ char cmd[] ="iostat -d -x"; char buffer[MAXBUFSIZE]; char a[20]; float arr[20]; FILE* pipe = popen(cmd, "r"); if (!pipe) return -1; fgets(buffer, sizeof(buffer), pipe); fgets(buffer, sizeof(buffer), pipe); fgets(buffer, sizeof(buffer), pipe); fgets(buffer, sizeof(buffer), pipe); sscanf(buffer,"%s %f %f %f %f %f %f %f %f %f %f %f %f %f ",a,&arr[0],&arr[1],&arr[2],&arr[3],&arr[4],&arr[5],&arr[6],&arr[7],&arr[8],&arr[9],&arr[10],&arr[11],&arr[12]); //printf("%f\n",arr[12]); return arr[12]; pclose(pipe); } void get_disk_occupy(char ** reused){ char currentDirectoryPath[ MAXBUFSIZE ]; getcwd(currentDirectoryPath, MAXBUFSIZE); //printf("當前目錄：%s\n",currentDirectoryPath); char cmd[50]="df "; strcat(cmd,currentDirectoryPath); //printf("%s\n",cmd); char buffer[MAXBUFSIZE]; FILE* pipe = popen(cmd, "r"); char fileSys[20]; char blocks[20]; char used[20]; char free[20]; char percent[10]; char moment[20]; if (!pipe) return ; if(fgets(buffer, sizeof(buffer), pipe)!=NULL){ sscanf(buffer,"%s %s %s %s %s %s",fileSys,blocks,used,free,percent,moment); } if(fgets(buffer, sizeof(buffer), pipe)!=NULL){ sscanf(buffer,"%s %s %s %s %s %s",fileSys,blocks,used,free,percent,moment); } //printf("desk used:%s\n",percent); strcpy(*reused,percent); return ; } void getCurrentDownloadRates(long int * save_rate) { char intface[] = "eth0:"; //這是網絡接口名，根據主機配置 //char intface[] = "wlan0:"; FILE * net_dev_file; char buffer[1024]; size_t bytes_read; char * match; if ( (net_dev_file=fopen("/proc/net/dev", "r")) == NULL ) { printf("open file /proc/net/dev/ error!\n"); exit(EXIT_FAILURE); } int i = 0; while(i++<20){ if(fgets(buffer, sizeof(buffer), net_dev_file)!=NULL){ if(strstr(buffer,intface)!=NULL){ //printf("%d %s\n",i,buffer); sscanf(buffer,"%s %ld",buffer,save_rate); break; } } } if(i==20) *save_rate=0.01; fclose(net_dev_file); //關閉文件 return ; }
打印結果：
cpu mum:4 cpu used:1.25 mem used:70.30 io used:0.10 disk used:4% download is : 4963.33 byte/s