86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <time.h>
|
||
#include <unistd.h>
|
||
|
||
#define FNAME "time.log"
|
||
#define BUFSIZE 1024
|
||
|
||
/**
|
||
* @brief 往文件里面输出时间戳
|
||
* @details
|
||
* 实例格式：2019-12-12 12:12:12
|
||
*
|
||
* @param argc
|
||
* @param argv
|
||
*
|
||
* @return int
|
||
*/
|
||
int main(int argc, char **argv)
|
||
{
|
||
FILE *fp;
|
||
time_t stamp;
|
||
struct tm *tm;
|
||
char buf[BUFSIZE];
|
||
int count = 0;
|
||
|
||
fp = fopen(FNAME, "a+");
|
||
if (fp == NULL)
|
||
{
|
||
perror("fopen()");
|
||
exit(1);
|
||
}
|
||
|
||
while (fgets(buf, BUFSIZE, fp) != NULL)
|
||
count++;
|
||
|
||
while (1)
|
||
{
|
||
stamp = time(NULL);
|
||
|
||
tm = localtime(&stamp);
|
||
if (NULL == tm)
|
||
{
|
||
perror("localtime()");
|
||
exit(1);
|
||
}
|
||
|
||
strftime(buf, BUFSIZE, "%Y-%m-%d %H:%M:%S", tm);
|
||
|
||
fprintf(fp, "%-4d%s\n", ++count, buf);
|
||
|
||
/*
|
||
* 加了sleep(1)之后就没有输出？
|
||
* 全缓冲
|
||
* 因为缓冲区没有满，没有刷新到文件里面
|
||
*/
|
||
fflush(fp);
|
||
|
||
sleep(1);
|
||
}
|
||
|
||
fclose(fp);
|
||
exit(0);
|
||
}
|
||
|
||
//! 最终效果
|
||
// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ ./test
|
||
// ^C
|
||
// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ cat time.log
|
||
// 1 2024-05-11 21:53:26
|
||
// 2 2024-05-11 21:53:27
|
||
// 3 2024-05-11 21:53:28
|
||
// 4 2024-05-11 21:53:29
|
||
// 5 2024-05-11 21:53:30
|
||
// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ ./test
|
||
// ^C
|
||
// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ cat time.log
|
||
// 1 2024-05-11 21:53:26
|
||
// 2 2024-05-11 21:53:27
|
||
// 3 2024-05-11 21:53:28
|
||
// 4 2024-05-11 21:53:29
|
||
// 5 2024-05-11 21:53:30
|
||
// 6 2024-05-11 21:53:35
|
||
// 7 2024-05-11 21:53:36
|
||
// 8 2024-05-11 21:53:37
|
||
// 9 2024-05-11 21:53:38
|