添加日志文件

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<time.h>

void writelog(const char* log)
{
    time_t tDate;
    struct tm* eventTime;
    time(&tDate);//得到系统当前时间
    eventTime=localtime(&tDate);//将time_t数据类型转化为struct tm结构
    int iYear = eventTime->tm_year+1900;
    int iMon = eventTime->tm_mon +1;
    int iDay =eventTime->tm_wday;
    int iHour = eventTime->tm_hour;
    int iMin = eventTime->tm_min;
    int iSec = eventTime->tm_sec;

    printf("wday =%d\n",eventTime->tm_wday);  //星期几
    printf("wday =%d\n",eventTime->tm_yday);  //从一月一号到现在多少天了
    printf("eventTime->tm_isdst = %d\n",eventTime->tm_isdst);

    char sDate[16];
    sprintf(sDate,"%04d-%02d-%02d",iYear,iMon,iDay);
    char sTime[16];
    sprintf(sTime,"%02d:%02d:%02d",iHour,iMin,iSec);
    char s[1024];
    sprintf(s,"%s %s %s\n",sDate,sTime,log);
    FILE* p=fopen("my.log","a+");
    if(p==NULL)
    {
        printf("write log my.log error:%s\n",strerror(errno));
    }
    else
    {
        fputs(s,p);
        fclose(p);
    }
}

int main(int arg, char *args[])
{
    writelog("process begin");
    printf("hello world\n");
    writelog("process end");

    return 0;
}