想获取一下目标机运行时linux系统的硬件占用情况，写了这几个小程序，以后直接用了。
方法就是读取proc下的文件来获取了。 cpu使用率：    /proc/stat ，内存使用情况：      /proc/meminfo
看程序 ：
/***************************************************************
*    @file:        statusinfo.c
*
*    @brief:        从linux系统获取cpu及内存使用情况
*
*    @version    1.0
*
***************************************************************/
typedef struct PACKED         //定义一个cpu occupy的结构体
{
char name[20];      //定义一个char类型的数组名name有20个元素
unsigned int user; //定义一个无符号的int类型的user
unsigned int nice; //定义一个无符号的int类型的nice
unsigned int system;//定义一个无符号的int类型的system
unsigned int idle; //定义一个无符号的int类型的idle
}CPU_OCCUPY;

typedef struct PACKED         //定义一个mem occupy的结构体
{
char name[20];      //定义一个char类型的数组名name有20个元素
unsigned long total; 
char name2[20];
unsigned long free;                       
}MEM_OCCUPY;

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
{
    FILE *fd;          
    int n;             
    char buff[256];   
    MEM_OCCUPY *m;
    m=mem;
                                                                                                              
    fd = fopen ("/proc/meminfo", "r"); 
      
    fgets (buff, sizeof(buff), fd); 
    fgets (buff, sizeof(buff), fd); 
    fgets (buff, sizeof(buff), fd); 
    fgets (buff, sizeof(buff), fd); 
    sscanf (buff, "%s %u %s", m->name, &m->total, m->name2); 
    
    fgets (buff, sizeof(buff), fd); //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 
    sscanf (buff, "%s %u", m->name2, &m->free, m->name2); 
    
    fclose(fd);     //关闭文件fd
}

int cal_cpuoccupy (CPU_OCCUPY *o, CPU_OCCUPY *n) 
{   
    unsigned long od, nd;    
    unsigned long id, sd;
    int cpu_use = 0;   
    
    od = (unsigned long) (o->user + o->nice + o->system +o->idle);//第一次(用户+优先级+系统+空闲)的时间再赋给od
    nd = (unsigned long) (n->user + n->nice + n->system +n->idle);//第二次(用户+优先级+系统+空闲)的时间再赋给od
      
    id = (unsigned long) (n->user - o->user);    //用户第一次和第二次的时间之差再赋给id
    sd = (unsigned long) (n->system - o->system);//系统第一次和第二次的时间之差再赋给sd
    if((nd-od) != 0)
    cpu_use = (int)((sd+id)*10000)/(nd-od); //((用户+系统)乖100)除(第一次和第二次的时间差)再赋给g_cpu_used
    else cpu_use = 0;
    //printf("cpu: %u/n",cpu_use);
    return cpu_use;
}

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
{   
    FILE *fd;         
    int n;            
    char buff[256]; 
    CPU_OCCUPY *cpu_occupy;
    cpu_occupy=cpust;
                                                                                                               
    fd = fopen ("/proc/stat", "r"); 
    fgets (buff, sizeof(buff), fd);
    
    sscanf (buff, "%s %u %u %u %u", cpu_occupy->name, &cpu_occupy->user, &cpu_occupy->nice,&cpu_occupy->system, &cpu_occupy->idle);
    
    fclose(fd);     
}

int main()
{
    CPU_OCCUPY cpu_stat1;
    CPU_OCCUPY cpu_stat2;
    MEM_OCCUPY mem_stat;
    int cpu;
    
    //获取内存
    get_memoccupy ((MEM_OCCUPY *)&mem_stat);
    
    //第一次获取cpu使用情况
    get_cpuoccupy((CPU_OCCUPY *)&cpu_stat1);
    sleep(10);
    
    //第二次获取cpu使用情况
    get_cpuoccupy((CPU_OCCUPY *)&cpu_stat2);
    
    //计算cpu使用率
    cpu = cal_cpuoccupy ((CPU_OCCUPY *)&cpu_stat1, (CPU_OCCUPY *)&cpu_stat2);
    
    return 0;
}