12.时钟与信号

#include <stdio.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
//excise to ms
#include <sys/time.h>

//get time
void TestTime()
{

    time_t iTime = time(NULL);
    //get time(second).from 1900.01.01 to now
    time(&iTime);
    printf("iTime:%d
",(int)iTime);

    //time's struct
    struct tm *pNow;
    pNow = localtime(&iTime);
    //get current time
    printf("TIME:%4d-%02d-%02d %02:%02d:%02d week %d 
"
           ,pNow->tm_year + 1900,pNow->tm_mon +1 ,pNow->tm_mday,
           pNow->tm_hour,pNow->tm_min,pNow->tm_sec,
           pNow->tm_wday);

    char szTime[40];
                         //data time
    strftime(szTime,40,"TIME:%x %X
",pNow);
    printf("%s
",szTime);

    strftime(szTime,40,"TIME: %Y-%m-%d %H:%M:%S week %w
",pNow);
    printf("%s
",szTime);
}

//get precise time
void TestMicroTime()
{
    struct timeval tv;
    struct timezone tz;

    gettimeofday(&tv,&tz);

    struct tm *pNow = localtime(&(tv.tv_sec));

    printf("Precise TIME:%4d-%02d-%02d %02d:%02d:%02d
"
           ,pNow->tm_year + 1900,pNow->tm_mon +1 ,pNow->tm_mday,
           pNow->tm_hour,pNow->tm_min,pNow->tm_sec,
           (int)tv.tv_usec);
    printf("zone:offset minute=%d,dst=%d
",tz.tz_minuteswest,tz.tz_dsttime);


    //calc runing time
    struct timeval tv1,tv2;
    gettimeofday(&tv1,NULL);
    int i=0,sum=0;
    while(i++<0xfffffff)
    {
        sum += i;
    }
    gettimeofday(&tv2,NULL);

    int usec = tv2.tv_usec - tv1.tv_usec;
    int sec = tv2.tv_sec - tv1.tv_sec;

    if(usec<0)
    {
        usec += 1000*1000;
        sec--;
    }

    printf("Interval time: %d,%d
",sec,usec);
}

void fun(int sig)
{
    printf("Receive signal:%s [%d]
",strsignal(sig),sig);

    //resume default dispose
    signal(SIGINT,SIG_DFL);
}

void TestSignal()
{
    printf("Test signal...
");
    //capture SIGINT
    signal(SIGINT,fun);
    //capture SIGTERM
    signal(SIGTERM,fun);
    //ignore this signal
    signal(SIGKILL,SIG_IGN);
    while(1);
}


int main()
{
    //TestTime();
    //TestMicroTime();
    TestSignal();

    return 0;
}