通道实现进程间通信

fork创建子进程，pipe及read、write实现进程间通信

#include <stdio.h>#include <unistd.h>main(){        int i;        int ppid[2];        pipe(ppid);        int pid = fork();        if (0 == pid)        {                write(ppid[1],"test",sizeof("test"));        }        else        {                char buf[128] = {0};                read(ppid[0],buf,128);                printf("buf is %s\n",buf);        }}