C/C++获取Linux系统CPU和内存及硬盘使用情况

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：
[cpp] view plain copy
1. //通过获取/proc/stat (CPU)和/proc/meminfo(内存和硬盘)文件信息
2. //proc/meminfo文件结构
3. //MemTotal: 515164 kB
4. //MemFree: 15024 kB
5. //Buffers: 13740 kB
6. //Cached: 248824 kB
7. //SwapCached: 960 kB
8. //Active: 309980 kB
9. //Inactive: 63420 kB
10. typedef struct MEMPACKED //定义一个mem occupy的结构体
11. {
12. char name1[20]; //定义一个char类型的数组名name有20个元素
13. unsigned long MemTotal;
14. char name2[20];
15. unsigned long MemFree;
16. char name3[20];
17. unsigned long Buffers;
18. char name4[20];
19. unsigned long Cached;
20. char name5[20];
21. unsigned long SwapCached;
22. }MEM_OCCUPY;
24. //proc/stat文件结构
25. //cpu 633666 46912 249878 176813696 782884 2859 19625 0
26. //cpu0 633666 46912 249878 176813696 782884 2859 19625 0
27. //intr 5812844
28. //ctxt 265816063
29. //btime 1455203832
30. //processes 596625
31. //procs_running 1
32. //procs_blocked 0
34. typedef struct CPUPACKED //定义一个cpu occupy的结构体
35. {
36. char name[20]; //定义一个char类型的数组名name有20个元素
37. unsigned int user; //定义一个无符号的int类型的user
38. unsigned int nice; //定义一个无符号的int类型的nice
39. unsigned int system;//定义一个无符号的int类型的system
40. unsigned int idle; //定义一个无符号的int类型的idle
41. unsigned int lowait;
42. unsigned int irq;
43. unsigned int softirq;
44. }CPU_OCCUPY;
47. 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
48. {
49. FILE *fd;
50. char buff[256];
51. MEM_OCCUPY *m;
52. m = mem;
54. fd = fopen("/proc/meminfo", "r");
55. //MemTotal: 515164 kB
56. //MemFree: 7348 kB
57. //Buffers: 7892 kB
58. //Cached: 241852 kB
59. //SwapCached: 0 kB
60. //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
61. fgets(buff, sizeof(buff), fd);
62. sscanf(buff, "%s %lu ", m->name1, &m->MemTotal);
63. fgets(buff, sizeof(buff), fd);
64. sscanf(buff, "%s %lu ", m->name2, &m->MemFree);
65. fgets(buff, sizeof(buff), fd);
66. sscanf(buff, "%s %lu ", m->name3, &m->Buffers);
67. fgets(buff, sizeof(buff), fd);
68. sscanf(buff, "%s %lu ", m->name4, &m->Cached);
69. fgets(buff, sizeof(buff), fd);
70. sscanf(buff, "%s %lu", m->name5, &m->SwapCached);
72. fclose(fd); //关闭文件fd
73. }
76. 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
77. {
78. FILE *fd;
79. char buff[256];
80. CPU_OCCUPY *cpu_occupy;
81. cpu_occupy = cpust;
83. fd = fopen("/proc/stat", "r");
84. fgets(buff, sizeof(buff), fd);
86. 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);
89. fclose(fd);
91. return 0;
92. }
95. int cal_cpuoccupy(CPU_OCCUPY *o, CPU_OCCUPY *n)
96. {
97. unsigned long od, nd;
98. double cpu_use = 0;
100. 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
101. 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
102. double sum = nd - od;
103. double idle = n->idle - o->idle;
104. cpu_use = idle / sum;
105. printf("cpu_use1(idle) = %f ", cpu_use);
106. idle = n->user + n->system + n->nice - o->user - o->system - o->nice;
107. cpu_use = idle / sum;
108. printf("cpu_use2(user+system+nice) = %f ", cpu_use);
109. return 0;
110. }
112. int main( int argc, char **argv )
113. {
114. MEM_OCCUPY mem_stat;
115. CPU_OCCUPY cpu_stat1;
116. CPU_OCCUPY cpu_stat2;
118. CAfcLowerTools m_afcLowerTools;
120. //获取内存
121. get_memoccupy((MEM_OCCUPY *)&mem_stat);
122. printf(" [MemTotal] = %lu [MemFree] = %lu [Buffers] = %lu [Cached] = %lu [SwapCached] = %lu ", mem_stat.MemTotal, mem_stat.MemFree, mem_stat.Buffers, mem_stat.Cached, mem_stat.SwapCached);
124. //第一次获取cpu使用情况
125. get_cpuoccupy((CPU_OCCUPY *)&cpu_stat1);
126. Sleep(1000);
127. //第二次获取cpu使用情况
128. get_cpuoccupy((CPU_OCCUPY *)&cpu_stat2);
129. //计算cpu使用率
130. cal_cpuoccupy((CPU_OCCUPY *)&cpu_stat1, (CPU_OCCUPY *)&cpu_stat2);
132. }
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原文地址：https://www.cnblogs.com/lidabo/p/7554465.html