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