55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
|
/*************************************************************************
|
||
|
|
> File Name : ipc_pip_nameless.c
|
||
|
|
> Author : TL Song
|
||
|
|
> EMail : songtianlun@frytea.com
|
||
|
|
> Created Time : Mon 28 Dec 2020 03:46:41 PM CST
|
||
|
|
************************************************************************/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
int pipe_fd[2];
|
||
|
|
pid_t pid;
|
||
|
|
char r_buf[10];
|
||
|
|
char w_buf[4];
|
||
|
|
int r_num;
|
||
|
|
|
||
|
|
memset(r_buf,0,sizeof(r_buf));
|
||
|
|
memset(w_buf,0,sizeof(w_buf));
|
||
|
|
if(pipe(pipe_fd)<0)
|
||
|
|
{
|
||
|
|
printf("pipe create error\n");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if((pid=fork())==0)
|
||
|
|
{
|
||
|
|
printf("\n");
|
||
|
|
close(pipe_fd[1]);
|
||
|
|
sleep(3);//确保父进程关闭写端
|
||
|
|
r_num=read(pipe_fd[0],r_buf,10);
|
||
|
|
printf( "read num is %d the data read from the pipe is %d\n",r_num,atoi(r_buf));
|
||
|
|
|
||
|
|
close(pipe_fd[0]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
else if(pid>0)
|
||
|
|
{
|
||
|
|
close(pipe_fd[0]);//close read
|
||
|
|
strcpy(w_buf,"111");
|
||
|
|
if(write(pipe_fd[1],w_buf,4)!=-1)
|
||
|
|
printf("parent write over\n");
|
||
|
|
printf("parent close fd[1] over\n");
|
||
|
|
close(pipe_fd[1]);//write
|
||
|
|
sleep(10);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|