摘要：
fgets（buff，sizeof（buff），fd）；sscanf（buff，“%s%u%u%u%u”，o-˃名称，&o-˃用户，&o-˃nice，&o-˃系统，&o-˃idle）；fclose（fd）；}voidget_member_occupy（mem_occupy*mem）｛FILE*fd；charbuff[MAXBUFSIZE]；fd=fopen（“/proc/meminfo”，“r”）；fgets（buff，sizeof（buff），fd）；sscanf（buff“%s%ld”，mem-˃name，&membe-˃total）；fget（buff、sizeof（buff），fd；sscanv（buff”%s%ld“，mem-˃name2，&membe-˃free）；｝floatget_ io_ occupy（）｛charcmd[]=“iostat-d-x”；charbuffer[MAXBUFSIZE]；chara[20]；floatarr[20]；FILE*管道=popen（cmd，“r”）；if（！管道）return-1；fgets（缓冲区，sizeof（缓冲区），管道）；fget（缓冲区、sizeof（缓存区）、管道）f%f%f%f“，a，&arr[0]，&arr[1]，&arr[2]，&arr[3]，&arr[4]，&arr[5]&
代码：
#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #define MAXBUFSIZE 1024 #define WAIT_SECOND 3 //暂停时间，单位为“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; //定义一个全局的int类型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; //获取cpu核数 cpu_num = sysconf(_SC_NPROCESSORS_ONLN); printf("cpu mum:%d ",cpu_num); //获取cpu使用率 get_occupy(&ocpu); sleep(1); get_occupy(&ncpu); cal_occupy(&ocpu, &ncpu); printf("cpu used:%4.2f ", g_cpu_used); //获取内存使用率 get_mem_occupy(&mem); double using = ((double)(mem.total - mem.free)/mem.total)*100; printf("mem used:%4.2f ",using); //获取io使用率 printf("io used:%4.2f ",get_io_occupy()); //获取当前磁盘的使用率 char t[20]=""; char *used = t; get_disk_occupy(&used); //char used[20]=" " ; //get_disk_occupy((char **)&used); printf("disk used:%s ",used); //网络延迟 long int start_download_rates; //保存开始时的流量计数 long int end_download_rates; //保存结果时的流量计数 getCurrentDownloadRates(&start_download_rates);//获取当前流量，并保存在start_download_rates里 sleep(WAIT_SECOND); //休眠多少秒，这个值根据宏定义中的WAIT_SECOND的值来确定 getCurrentDownloadRates(&end_download_rates);//获取当前流量，并保存在end_download_rates里 printf("download is : %4.2f byte/s ",( (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(用户+优先级+系统+空闲)的时间再赋给od nd = (double) (n->user + n->nice + n->system +n->idle);//第二次(用户+优先级+系统+空闲)的时间再赋给od scale = 100.0 / (float)(nd-od); //100除强制转换(nd-od)之差为float类型再赋给scale这个变量 id = (double) (n->user - o->user); //用户第一次和第二次的时间之差再赋给id sd = (double) (n->system - o->system);//系统第一次和第二次的时间之差再赋给sd g_cpu_used = ((sd+id)*100.0)/(nd-od); //((用户+系统)乖100)除(第一次和第二次的时间差)再赋给g_cpu_used } void get_occupy (CPU_OCCUPY *o) { FILE *fd; int n; char buff[MAXBUFSIZE]; fd = fopen ("/proc/stat", "r"); //这里只读取stat文件的第一行及cpu总信息，如需获取每核cpu的使用情况，请分析stat文件的接下来几行。 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 ",arr[12]); return arr[12]; pclose(pipe); } void get_disk_occupy(char ** reused){ char currentDirectoryPath[ MAXBUFSIZE ]; getcwd(currentDirectoryPath, MAXBUFSIZE); //printf("当前目录：%s ",currentDirectoryPath); char cmd[50]="df "; strcat(cmd,currentDirectoryPath); //printf("%s ",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 ",percent); strcpy(*reused,percent); return ; } void getCurrentDownloadRates(long int * save_rate) { char intface[] = "eth0:"; //这是网络接口名，根据主机配置 //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! "); 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 ",i,buffer); sscanf(buffer,"%s %ld",buffer,save_rate); break; } } } if(i==20) *save_rate=0.01; fclose(net_dev_file); //关闭文件 return ; }
打印结果：
cpu mum:4 cpu used:1.25 mem used:70.30 io used:0.10 disk used:4% download is : 4963.33 byte/s