Linnux无名管道的创建例子

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例子：创建一个进程两个管道从一管道写入小写字符串，另一管道读出大写字符串

#include <stdio.h>#include<unistd.h>#include<sys/types.h>#include<errno.h>#include<string.h>#include<stdlib.h>int main(){int fd[2],fd1[2];pid_t pid,pid1;char r_buf[100];char w_buf[100];char buf[100];char *p_wbuf;int r_num,i;memset(r_buf,0,sizeof(r_buf));memset(w_buf,0,sizeof(w_buf));p_wbuf=w_buf;if(pipe(fd)<0){printf("pipe create error!\n");return -1;}if(pipe(fd1)<0){printf("pipe fd1 create error!\n");return -1;}if((pid = fork())==0){close(fd[1]);close(fd1[0]);sleep(3);if((r_num=read(fd[0],r_buf,100))>0){printf("%d num from to pipe is %s\n",r_num,r_buf);}for(i=0;i<r_num;i++){r_buf[i] -= 32;}if(write(fd1[1],r_buf,r_num)==-1){printf("write fd1[1] successful!\n");}close(fd1[1]);close(fd[0]);exit(0);}else if(pid>0){close(fd[0]);close(fd1[1]);sleep(1);printf("input string:");scanf("%s",w_buf);write(fd[1],w_buf,strlen(w_buf));sleep(1);if(r_num=read(fd1[0],w_buf,100)>0);{printf("from to pipe is %s\n",w_buf);}close(fd[1]);close(fd1[0]);waitpid(pid,NULL,0);}return 0;}

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