76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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typedef struct cpu_occupy_
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{
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char name[20];
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unsigned int user;
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unsigned int nice;
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unsigned int system;
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unsigned int idle;
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unsigned int iowait;
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unsigned int irq;
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unsigned int softirq;
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} cpu_occupy_t;
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static double cal_cpuoccupy(cpu_occupy_t *o, cpu_occupy_t *n)
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{
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double od, nd;
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double id, sd;
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double cpu_use;
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od = (double)(o->user + o->nice + o->system + o->idle + o->softirq + o->iowait +
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o->irq);
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nd = (double)(n->user + n->nice + n->system + n->idle + n->softirq + n->iowait +
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n->irq);
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id = (double)(n->idle);
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sd = (double)(o->idle);
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if ((nd - od) != 0)
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cpu_use = 100.0 - ((id - sd)) / (nd - od) * 100.00;
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else
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cpu_use = 0;
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return cpu_use;
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}
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static void get_cpuoccupy(cpu_occupy_t *cpust)
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{
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FILE *fd;
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int n;
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char buff[256];
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cpu_occupy_t *cpu_occupy;
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cpu_occupy = cpust;
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fd = fopen("/proc/stat", "r");
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if (fd == NULL)
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{
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printf("open /proc/stat failed\n");
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return;
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}
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if (fgets(buff, sizeof(buff), fd) == NULL)
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printf("fgets failed\n");
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sscanf(buff, "%s %u %u %u %u %u %u %u", cpu_occupy->name,
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&cpu_occupy->user, &cpu_occupy->nice, &cpu_occupy->system,
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&cpu_occupy->idle, &cpu_occupy->iowait, &cpu_occupy->irq,
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&cpu_occupy->softirq);
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fclose(fd);
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}
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double get_cpu_usage(void)
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{
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static cpu_occupy_t cpu_stat1;
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cpu_occupy_t cpu_stat2;
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double cpu;
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get_cpuoccupy(&cpu_stat2);
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cpu = cal_cpuoccupy(&cpu_stat1, &cpu_stat2);
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memcpy(&cpu_stat1, &cpu_stat2, sizeof(cpu_occupy_t));
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return cpu;
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}
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