[시스템] CPU 사용량 측정 소스 코드
CPU Tick count 를 이용한 일반적인 CPU점유율 모니터를 만들어 봤습니다.
아래 파일을 “cpuusage.c” 로 저장후 다음과 같이 컴파일 합니다.
bash# gcc -s -O2 -Wall -I. -ansi -o cpuusage cpuusage.c
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/*
Copyright (c) 2002 Information Equipment co.,LTD.
All Right Reserved.
Code by JaeHyuk Cho < minzkn@infoeq.co.kr >
– Simple is best
– [SEE] Linux kernel /usr/src/linux/fs/proc/proc_misc.c FUNCTION(kstat_read_proc)
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#define DEF_PROCSTAT_BUFFER_SIZE (1 << 10) /* 1 KBytes (512 + 512 ^^) */
int main(int s_Argc, char **s_Argv)
{
const char *s_ProcStat = “/proc/stat”;
const char *s_CPUName = “cpu “;
int s_Handle, s_Check, s_Count;
char s_StatBuffer[ DEF_PROCSTAT_BUFFER_SIZE ];
char *s_String;
unsigned long s_CPUTick[2][5];
float s_DiffTotal;
fprintf(stdout, “MZ_cpuusage v1.0.0 – Copyright(c)InfoEQ co.,LTD – %s %s\\n”, __DATE__, __TIME__);
fprintf(stdout, “Code by JaeHyuk Cho – < minzkn@infoeq.co.kr >\\n\\n”);
memset(&s_CPUTick[0][0], 0, sizeof(s_CPUTick));
do
{
s_Handle = open(s_ProcStat, O_RDONLY);
if(s_Handle >= 0)
{
s_Check = read(s_Handle, &s_StatBuffer[0], sizeof(s_StatBuffer) – 1);
close(s_Handle);
if(s_Check > 0)
{
s_StatBuffer[s_Check] = ‘\\0’;
s_String = strstr(&s_StatBuffer[0], s_CPUName); /* Total CPU entry */
if(s_String)
{
s_Check = sscanf(s_String, “cpu %lu %lu %lu %lu”, \\
&s_CPUTick[0][0], &s_CPUTick[0][1], &s_CPUTick[0][2], &s_CPUTick[0][3]);
if(s_Check == 4)
{
for(s_Count = 0, s_CPUTick[0][4] = 0lu; s_Count < 4;s_Count++)s_CPUTick[0][4] += s_CPUTick[0][s_Count];
s_DiffTotal = (float)(s_CPUTick[0][4] – s_CPUTick[1][4]);
if(s_DiffTotal > 0.0)
{
fprintf(stdout, “[CPU] User=%1.2f%%, Nice=%1.2f%%, System=%1.2f%%, Idle=%1.2f%%\\n”, \\
(float)( (float)((s_CPUTick[0][0] – s_CPUTick[1][0]) * 100lu) / s_DiffTotal ),\\
(float)( (float)((s_CPUTick[0][1] – s_CPUTick[1][1]) * 100lu) / s_DiffTotal ),\\
(float)( (float)((s_CPUTick[0][2] – s_CPUTick[1][2]) * 100lu) / s_DiffTotal ),\\
(float)( (float)((s_CPUTick[0][3] – s_CPUTick[1][3]) * 100lu) / s_DiffTotal ));
memcpy(&s_CPUTick[1][0], &s_CPUTick[0][0], sizeof(s_CPUTick) >> 1);
}
else fprintf(stderr, “%s: Destroy proc fs !!!\\n”, s_Argv[0]);
}
else fprintf(stderr, “%s: Can not parse !!!\\n”, s_Argv[0]);
}
else fprintf(stderr, “%s: Can not found info !!!\\n”, s_Argv[0]);
}
else fprintf(stderr, “%s: Can not read %s !!!\\n”, s_Argv[0], s_ProcStat);
}
else fprintf(stderr, “%s: Can not open %s !!!\\n”, s_Argv[0], s_ProcStat);
sleep(1); /* Check term */
}while(1);
return(0);
}
/* End of source */
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