C/C++获取Linux系统CPU和内存及硬盘使用情况
需求分析:
不使用Top df free 等命令,利用C/C++获取Linux系统CPU和内存及硬盘使用情况
实现:
- //通过获取/proc/stat (CPU)和/proc/meminfo(内存和硬盘)文件信息
- //proc/meminfo文件结构
- //MemTotal: 515164 kB
- //MemFree: 15024 kB
- //Buffers: 13740 kB
- //Cached: 248824 kB
- //SwapCached: 960 kB
- //Active: 309980 kB
- //Inactive: 63420 kB
- typedef struct MEMPACKED //定义一个mem occupy的结构体
- {
- <span style="white-space:pre"> </span>char name1[20]; //定义一个char类型的数组名name有20个元素
- <span style="white-space:pre"> </span>unsigned long MemTotal;
- <span style="white-space:pre"> </span>char name2[20];
- <span style="white-space:pre"> </span>unsigned long MemFree;
- <span style="white-space:pre"> </span>char name3[20];
- <span style="white-space:pre"> </span>unsigned long Buffers;
- <span style="white-space:pre"> </span>char name4[20];
- <span style="white-space:pre"> </span>unsigned long Cached;
- <span style="white-space:pre"> </span>char name5[20];
- <span style="white-space:pre"> </span>unsigned long SwapCached;
- }MEM_OCCUPY;
- //proc/stat文件结构
- //cpu 633666 46912 249878 176813696 782884 2859 19625 0
- //cpu0 633666 46912 249878 176813696 782884 2859 19625 0
- //intr 5812844
- //ctxt 265816063
- //btime 1455203832
- //processes 596625
- //procs_running 1
- //procs_blocked 0
- typedef struct CPUPACKED //定义一个cpu occupy的结构体
- {
- <span style="white-space:pre"> </span>char name[20]; //定义一个char类型的数组名name有20个元素
- <span style="white-space:pre"> </span>unsigned int user; //定义一个无符号的int类型的user
- <span style="white-space:pre"> </span>unsigned int nice; //定义一个无符号的int类型的nice
- <span style="white-space:pre"> </span>unsigned int system;//定义一个无符号的int类型的system
- <span style="white-space:pre"> </span>unsigned int idle; //定义一个无符号的int类型的idle
- <span style="white-space:pre"> </span>unsigned int lowait;
- <span style="white-space:pre"> </span>unsigned int irq;
- <span style="white-space:pre"> </span>unsigned int softirq;
- }CPU_OCCUPY;
- void get_memoccupy(MEM_OCCUPY *mem) //对无类型get函数含有一个形参结构体类弄的指针O
- {
- <span style="white-space:pre"> </span>FILE *fd;
- <span style="white-space:pre"> </span>char buff[256];
- <span style="white-space:pre"> </span>MEM_OCCUPY *m;
- <span style="white-space:pre"> </span>m = mem;
- <span style="white-space:pre"> </span>fd = fopen("/proc/meminfo", "r");
- <span style="white-space:pre"> </span>//MemTotal: 515164 kB
- <span style="white-space:pre"> </span>//MemFree: 7348 kB
- <span style="white-space:pre"> </span>//Buffers: 7892 kB
- <span style="white-space:pre"> </span>//Cached: 241852 kB
- <span style="white-space:pre"> </span>//SwapCached: 0 kB
- <span style="white-space:pre"> </span>//从fd文件中读取长度为buff的字符串再存到起始地址为buff这个空间里
- <span style="white-space:pre"> </span>fgets(buff, sizeof(buff), fd);
- <span style="white-space:pre"> </span>sscanf(buff, "%s %lu ", m->name1, &m->MemTotal);
- <span style="white-space:pre"> </span>fgets(buff, sizeof(buff), fd);
- <span style="white-space:pre"> </span>sscanf(buff, "%s %lu ", m->name2, &m->MemFree);
- <span style="white-space:pre"> </span>fgets(buff, sizeof(buff), fd);
- <span style="white-space:pre"> </span>sscanf(buff, "%s %lu ", m->name3, &m->Buffers);
- <span style="white-space:pre"> </span>fgets(buff, sizeof(buff), fd);
- <span style="white-space:pre"> </span>sscanf(buff, "%s %lu ", m->name4, &m->Cached);
- <span style="white-space:pre"> </span>fgets(buff, sizeof(buff), fd);
- <span style="white-space:pre"> </span>sscanf(buff, "%s %lu", m->name5, &m->SwapCached);
- <span style="white-space:pre"> </span>fclose(fd); //关闭文件fd
- }
- int get_cpuoccupy(CPU_OCCUPY *cpust) //对无类型get函数含有一个形参结构体类弄的指针O
- {
- <span style="white-space:pre"> </span>FILE *fd;
- <span style="white-space:pre"> </span>char buff[256];
- <span style="white-space:pre"> </span>CPU_OCCUPY *cpu_occupy;
- <span style="white-space:pre"> </span>cpu_occupy = cpust;
- <span style="white-space:pre"> </span>fd = fopen("/proc/stat", "r");
- <span style="white-space:pre"> </span>fgets(buff, sizeof(buff), fd);
- <span style="white-space:pre"> </span>sscanf(buff, "%s %u %u %u %u %u %u %u", cpu_occupy->name, &cpu_occupy->user, &cpu_occupy->nice, &cpu_occupy->system, &cpu_occupy->idle, &cpu_occupy->lowait, &cpu_occupy->irq, &cpu_occupy->softirq);
- <span style="white-space:pre"> </span>fclose(fd);
- <span style="white-space:pre"> </span>return 0;
- }
- int cal_cpuoccupy(CPU_OCCUPY *o, CPU_OCCUPY *n)
- {
- <span style="white-space:pre"> </span>unsigned long od, nd;
- <span style="white-space:pre"> </span>double cpu_use = 0;
- <span style="white-space:pre"> </span>od = (unsigned long)(o->user + o->nice + o->system + o->idle + o->lowait + o->irq + o->softirq);//第一次(用户+优先级+系统+空闲)的时间再赋给od
- <span style="white-space:pre"> </span>nd = (unsigned long)(n->user + n->nice + n->system + n->idle + n->lowait + n->irq + n->softirq);//第二次(用户+优先级+系统+空闲)的时间再赋给od
- <span style="white-space:pre"> </span>double sum = nd - od;
- <span style="white-space:pre"> </span>double idle = n->idle - o->idle;
- <span style="white-space:pre"> </span>cpu_use = idle / sum;
- <span style="white-space:pre"> </span>printf("cpu_use1(idle) = %f\r\n", cpu_use);
- <span style="white-space:pre"> </span>idle = n->user + n->system + n->nice - o->user - o->system - o->nice;
- <span style="white-space:pre"> </span>cpu_use = idle / sum;
- <span style="white-space:pre"> </span>printf("cpu_use2(user+system+nice) = %f\r\n", cpu_use);
- <span style="white-space:pre"> </span>return 0;
- }
- int main( int argc, char **argv )
- {
- <span style="white-space:pre"> </span>MEM_OCCUPY mem_stat;
- <span style="white-space:pre"> </span>CPU_OCCUPY cpu_stat1;
- <span style="white-space:pre"> </span>CPU_OCCUPY cpu_stat2;
- <span style="white-space:pre"> </span>CAfcLowerTools m_afcLowerTools;
- //获取内存
- <span style="white-space:pre"> </span>get_memoccupy((MEM_OCCUPY *)&mem_stat);
- <span style="white-space:pre"> </span>printf(" [MemTotal] = %lu \n [MemFree] = %lu \n [Buffers] = %lu \n [Cached] = %lu \n [SwapCached] = %lu \n", mem_stat.MemTotal, mem_stat.MemFree, mem_stat.Buffers, mem_stat.Cached, mem_stat.SwapCached);
- //第一次获取cpu使用情况
- <span style="white-space:pre"> </span>get_cpuoccupy((CPU_OCCUPY *)&cpu_stat1);
- <span style="white-space:pre"> </span>Sleep(1000);
- //第二次获取cpu使用情况
- <span style="white-space:pre"> </span>get_cpuoccupy((CPU_OCCUPY *)&cpu_stat2);
- //计算cpu使用率
- <span style="white-space:pre"> </span>cal_cpuoccupy((CPU_OCCUPY *)&cpu_stat1, (CPU_OCCUPY *)&cpu_stat2);
- }
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