sysinfo函数、结构体使用

article/2025/9/26 16:28:47

1，头文件：

#include <sys/sysinfo.h>

2，函数声明：

int sysinfo(struct sysinfo *info);

3，返回值：
成功返回0，错误返回-1；

4，sysinfo结构体名称
Linux 2.3.23(i386), 2.3.48 (all architectures)：(具体版本具体查看)

struct sysinfo {long uptime;          /* 启动到现在经过的时间 */unsigned long loads[3];  /* 1, 5, and 15 minute load averages */unsigned long totalram;  /* 总的可用的内存大小 */unsigned long freeram;   /* 还未被使用的内存大小 */unsigned long sharedram; /* 共享的存储器的大小*/unsigned long bufferram; /* 共享的存储器的大小 */unsigned long totalswap; /* 交换区大小 */unsigned long freeswap;  /* 还可用的交换区大小 */unsigned short procs;    /* 当前进程数目 */unsigned long totalhigh; /* 总的高内存大小 */unsigned long freehigh;  /* 可用的高内存大小 */unsigned int mem_unit;   /* 以字节为单位的内存大小 */char _f[20-2*sizeof(long)-sizeof(int)]; /* libc5的补丁
};

5，事例

#include <stdio.h>  #include <linux/kernel.h>     /* 包含sysinfo结构体信息*/  //using namespace std;  int main(int argc, char *agrv[])  {  struct sysinfo s_info;  int error;  error = sysinfo(&s_info);  printf("\n\ncode error=%d\n",error);  printf("Uptime = %ds\nLoad: 1 min%d / 5 min %d / 15 min %d\n"  "RAM: total %d / free %d /shared%d\n"  "Memory in buffers = %d\nSwap:total%d/free%d\n"  "Number of processes = %d\n",  s_info.uptime, s_info.loads[0],  s_info.loads[1], s_info.loads[2],  s_info.totalram, s_info.freeram,  s_info.totalswap, s_info.freeswap,  s_info.procs);  return 0;  }