进程A获取当前系统时间并写入到命名管道，进程B从命名管道中读取数据并存储在一个名字叫做log.txt的文本中。

/**********************************************************************************
*

```
     file name:  pipe1.c
```
```
     author   :  A13326981379@163.com
```
```
     date     :  2024/05/31
```

     function :  获取系统时间，将系统时间写入管道

```
     note     :  None          
```

     CopyRight (c) 2024-2024  A13326981379@163.com    All Right Reseverd

*******************************************************************************/
进程A代码：


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


int main(int argc, char const *argv[])
{
    char *wday[] = {"星期天", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
    time_t timep;
    struct tm *p;
    time(&timep);
    p = localtime(&timep);
    printf("%d年%02d月%02d日 ", (1900 + p->tm_year), (1 + p->tm_mon), p->tm_mday);
    printf("%s %02d:%02d:%02d\n", wday[p->tm_wday], p->tm_hour, p->tm_min, p->tm_sec);

    char msg[400] = {0};  // 修改为 400 字符
    sprintf(msg, "%d年%02d月%02d日 %s %02d:%02d:%02d\n", (1900 + p->tm_year), (1 + p->tm_mon), p->tm_mday, wday[p->tm_wday], p->tm_hour, p->tm_min, p->tm_sec);
    int fifd = open("./fifo1",O_RDWR);
    if (fifd == -1)
    {
        fprintf(stderr,"fifo pipe error,error:%d,%s",errno,strerror(errno));
        exit(1);
    }
    write(fifd,msg,strlen(msg));
	
    close(fifd);
    return 0;
}

/**********************************************************************************
*

```
     file name:  pipe2.c
```
```
     author   :  A13326981379@163.com
```
```
     date     :  2024/05/31
```

     function :  将管道中的信息读出来写入文本

```
     note     :  None          
```

     CopyRight (c) 2024-2024  A13326981379@163.com    All Right Reseverd

*******************************************************************************/

进程B的代码：

#include <errno.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
int main(int argc, char const *argv[])
{
    FILE *file_fd = fopen("log.txt","a");
    if (file_fd == NULL)
    {
        fprintf(stderr,"fifo pipe error,error:%d,%s\n",errno,strerror(errno));
        exit(1);
    }
    int fifd = open("./fifo1",O_RDWR);
    if (fifd == -1)
    {
        fprintf(stderr,"fifo pipe error,error:%d,%s",errno,strerror(errno));
        exit(1);
    }
    char buf[128] = {0};
    read(fifd,buf,128);
    fprintf(file_fd,"%s",buf);
    fclose(file_fd);
    close(fifd);

    return 0;
}