Linux C programming Get native CPU utilization memory usage hard disk usage __ block chain

1. Get CPU Utilization

The typedef struct CPU_PACKED         //defines a CPU occupy structure body
{
char name[20];             Defines a char-type array name with 20 elements
unsigned int user;        Defines a user unsigned int of unsigned type int nice
;        Defines a nice unsigned int system of unsigned int types
;    Defines a system unsigned int idle with unsigned int type
;         Defines an unsigned int-type idle
unsigned int iowait;
unsigned int IRQ;
unsigned int softirq;
} Cpu_occupy;

Main program:

Double Cal_cpuoccupy (cpu_occupy *o, Cpu_occupy *n) {double od, ND;
    Double ID, SD;

    Double Cpu_use; od = (double) (O->user + o->nice + o->system +O->IDLE+O->SOFTIRQ+O->IOWAIT+O->IRQ);//First time (user + priority + System + Idle time is then assigned to od nd = (double) (N->user + n->nice + n->system +N->IDLE+N->SOFTIRQ+N->IOWAIT+N->IRQ)    //second (user + priority + system + Idle) time is assigned to OD id = (double) (n->idle);    The difference between the first and second times of the user is then assigned to the ID SD = (double) (o->idle); The time difference between the first and second times of the system is then assigned to the SD if ((Nd-od)!= 0) Cpu_use =100.0-((ID-SD))/(Nd-od) *100.00;
    (user + system) good 100) in addition to (the first and second time difference) and then assigned to g_cpu_used else Cpu_use = 0;
return cpu_use;
    } void Get_cpuoccupy (Cpu_occupy *cpust) {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%u%u%u), Cpu_occupy->name, &cpu_occupy->user, &cpu_occupy->nice,&cpu_ occupy->system, &cpu_occupy->idle,&cpu_occupy->iowait,&cpu_occupy->irq,&cpu_occupy->

    SOFTIRQ);
Fclose (FD);
    Double Getcpurate () {cpu_occupy cpu_stat1;
    Cpu_occupy Cpu_stat2;
    Double CPU;
    Get_cpuoccupy ((Cpu_occupy *) &CPU_STAT1);

    Sleep (1);

    Second get CPU usage get_cpuoccupy ((cpu_occupy *) &CPU_STAT2);

    Compute CPU Usage CPU = cal_cpuoccupy ((cpu_occupy *) &CPU_STAT1, (Cpu_occupy *) &CPU_STAT2);
return CPU; }

2. Get Memory usage

typedef struct MEM_PACKED         //Definition of a MEM occupy structure body
{
        char name[20];      Defines a char type array name with 20 elements
        unsigned long total;
        Char name2[20];
} Mem_occupy;


typedef struct MEM_PACK         //define a MEM occupy structure body
{
        double total,used_rate;
} Mem_pack;

Main program:

Mem_pack *get_memoccupy ()    //Get RAM message
{
    FILE *fd;
    int n;
    Double mem_total,mem_used_rate;;
    Char buff[256];
    Mem_occupy *m= (Mem_occupy *) malloc (sizeof (mem_occupy))
    Mem_pack *p= (Mem_pack *) malloc (sizeof (Mem_pack));
    FD = fopen ("/proc/meminfo", "R");

    Fgets (buff, sizeof (buff), FD);
    SSCANF (Buff, "%s%lu%s\n", M->name, &m->total, m->name2);
    mem_total=m->total;
    Fgets (buff, sizeof (buff), FD);
    SSCANF (Buff, "%s%lu%s\n", M->name, &m->total, m->name2);
    Mem_used_rate= (1-m->total/mem_total) *100;
    mem_total=mem_total/(1024*1024);
    p->total=mem_total;
    p->used_rate=mem_used_rate;
    Fclose (FD);     Close file fd return
    p;
}

3. Get the use of hard disk

typedef struct DEV_MEM         //define a MEM occupy structure body
{
        double total,used_rate;
} Dev_mem;

Main program:

Dev_mem *get_devmem ()        //Get Hard disk meeeage
{
        FILE * FP;
        int h=0;
        Char buffer[80],a[80],d[80],e[80],f[80],buf[256];
        Double c,b;
        Fp=popen ("DF", "R");
        Fgets (BUF,256,FP);
        Double dev_total=0,dev_used=0;
        Dev_mem  *dev= (DEV_MEM *) malloc (sizeof (DEV_MEM));
        while (6==FSCANF (FP, "%s%lf%lf%s%s", a,&b,&c,d,e,f))
        {
                dev_total+=b;
                dev_used+=c;
        }
        dev->total=dev_total/1024/1024;;
        dev->used_rate=dev_used/dev_total*100;
        Pclose (FP);
        return dev;
}