统计Linux系统的内存和CPU使用信息
#include
#include
#include
#include
#include
#include
#include
#include
#include
void get_memory_info(char *buf, long long int *total, long long int *free) {
char path[64] = "/proc/meminfo";
FILE *fp = fopen(path, "r");
if (fp == NULL) {
perror("fopen");
return;
}
char line[256];
while (fgets(line, sizeof(line), fp)) {
if (strncmp(line, "MemTotal:", 8) == 0) {
*total = atoll(line + 8);
} else if (strncmp(line, "MemFree:", 7) == 0) {
*free = atoll(line + 7);
} else if (strncmp(line, "Buffers:", 7) == 0) {
*total += atoll(line + 7);
} else if (strncmp(line, "Cached:", 6) == 0) {
*total += atoll(line + 6);
}
}
fclose(fp);
}
void get_cpu_info(char *buf, double *user, double *system, double *idle) {
char path[64] = "/proc/stat";
FILE *fp = fopen(path, "r");
if (fp == NULL) {
perror("fopen");
return;
}
char line[256];
while (fgets(line, sizeof(line), fp)) {
if (strncmp(line, "cpu ", 4) == 0) {
sscanf(line, "cpu %lf %lf %lf", user, system, idle);
break;
}
}
fclose(fp);
}
int main() {
long long int total_memory, free_memory;
double user_cpu, system_cpu, idle_cpu;
time_t now;
struct tm *ltm;
char time_buf[32];
char mem_info[128], cpu_info[128];
get_memory_info(mem_info, &total_memory, &free_memory);
get_cpu_info(cpu_info, &user_cpu, &system_cpu, &idle_cpu);
now = time(NULL);
ltm = localtime(&now);
strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S", ltm);
printf("Memory usage: %lld MB total / %lld MB free
", total_memory / 1024 / 1024, free_memory / 1024 / 1024);
printf("CPU usage: %.2lf%% user / %.2lf%% system / %.2lf%% idle
", user_cpu * 100, system_cpu * 100, idle_cpu * 100);
printf("Time: %s
", time_buf);
printf("Memory info:%s", mem_info);
printf("CPU info:%s", cpu_info);
return 0;
}
这段代码定义了两个函数get_memory_info和get_cpu_info，分别用于获取内存和CPU使用信息。