pipe用法

pipe()函数例子：

#include<unistd.h>

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>

int main(void)
{
int ret = -1;
int nbytes;
pid_t pid;
char buf[] = "pipe test";
char rdbuf[80] ;


int fd[2];


int *write_fd = &fd[1];/*写描述符*/
int *read_fd = &fd[0];


ret = pipe(fd);/*建立管道*/
if(ret<0)
{
printf("管道建立失败\n");
return -1;
}

pid = fork();/*创建进程*/
if(pid==-1)
{
printf("进程建立失败\n");
return -1;
}
if(pid ==0)/*子进程*/
{
close(*read_fd);/*关闭读*/
ret = write(*write_fd,buf,strlen(buf));/*写入字符*/
return 0;
}
else
{
close(*write_fd);/*关闭写*/
memset(rdbuf,0,sizeof(rdbuf));
nbytes = read(*read_fd,rdbuf,sizeof(rdbuf));/*读取字符*/
printf("revice%ddatas:%s \n",nbytes,rdbuf);
}

return 0;

}