添加日志文件

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<unistd.h>
 4 #include<string.h>
 5 #include<errno.h>
 6 #include<sys/types.h>
 7 #include<sys/stat.h>
 8 #include<fcntl.h>
 9 #include<time.h>
10 
11 void writelog(const char* log)
12 {
13     time_t tDate;
14     struct tm* eventTime;
15     time(&tDate);//得到系统当前时间
16     eventTime=localtime(&tDate);//将time_t数据类型转化为struct tm结构
17     int iYear = eventTime->tm_year+1900;
18     int iMon = eventTime->tm_mon +1;
19     int iDay =eventTime->tm_wday;
20     int iHour = eventTime->tm_hour;
21     int iMin = eventTime->tm_min;
22     int iSec = eventTime->tm_sec;
23 
24     printf("wday =%d\n",eventTime->tm_wday);  //星期几
25     printf("wday =%d\n",eventTime->tm_yday);  //从一月一号到现在多少天了
26     printf("eventTime->tm_isdst = %d\n",eventTime->tm_isdst);
27 
28     char sDate[16];
29     sprintf(sDate,"%04d-%02d-%02d",iYear,iMon,iDay);
30     char sTime[16];
31     sprintf(sTime,"%02d:%02d:%02d",iHour,iMin,iSec);
32     char s[1024];
33     sprintf(s,"%s %s %s\n",sDate,sTime,log);
34     FILE* p=fopen("my.log","a+");
35     if(p==NULL)
36     {
37         printf("write log my.log error:%s\n",strerror(errno));
38     }
39     else
40     {
41         fputs(s,p);
42         fclose(p);
43     }
44 }
45 
46 int main(int arg, char *args[])
47 {
48     writelog("process begin");
49     printf("hello world\n");
50     writelog("process end");
51 
52     return 0;
53 }