Recommanded Free YOUTUBE Lecture: High Avalibility Application On AWS Cloud

Contents

1. 설명

리눅스/솔라리스 시스템의 부팅후 경과된 시간을 초단위로 얻어옵니다. 부팅시간은 /proc/uptime의 값을 이용해서 계산합니다. 부팅경과 시간은 단순히 시스템의 부팅 시간을 얻어오는 것 외에도 프로세스의 CPU사용율 등을 계산하기 위한 용도로도 사용됩니다.

2. 사용방법

int uptime();
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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  1. 리턴값 : 실패했을 경우 -1을 그렇지 않을경우 0보다 큰값을 리턴
int main()
{
time_t cutime = uptime();
time_t starttime = time((time_t *)NULL) - cutime;
printf("Uptime is %d sec\n", (unsigned int)cutime);
printf("Booting time is %s\n",time2str(starttime, "y/m/d/ D h:mi:s"));
return 0;
}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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다음은 출력 결과입니다.
# ./uptime
Uptime is 55489 sec
Booting time is 2004/02/01/ 01:50:42
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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<!> time2str 함수는 time2str을 참고하기 바랍니다.

3. 코드

#include <stdio.h>
#include <time.h>
#include "time2str.h"
#ifdef _SOLARIS_
#include <kstat.h>
#endif
#include <stdio.h>
int uptime()
{
double stime;
double idletime;
#ifdef _LINUX_
char buf[36];
FILE *fp;
if ((fp = fopen("/proc/uptime", "r")) == NULL)
{
return -1;
}
fgets(buf, 36, fp);
sscanf(buf, "%lf %lf", &stime, &idletime);
fclose(fp);
return (int)stime;
#endif
#ifdef _SOLARIS_
kstat_ctl_t *kc;
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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4. 컴파일

  • Solaris에서 컴파일 할경우 kstat를 링크시켜주어야 한다.
    # gcc -o test uptime.c -lksat -D_SOLARIS_
    הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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5. 변경사항

  1. 솔라리스에 사용가능하도록 변경 : 2005/05/12