将子进程写到文件file中的内容读取出来，输出到屏幕上。#include #include #include #include #include #include #include int main(int argc,char* argv[]){pid_t pid;int fd;char * info = "goodbye world";char buf[64] = {0};int nBytes;fd =1;if(fd < 0){perror("open file failed");exit(1);}if((pid =2) < 0){perror("fork error");}else if(pid3){if((nBytes = 4)) < 0){perror("write failed");}exit(0);}else{sleep(1);5；if((nBytes =6)) < 0){perror("read failed");}printf("%s\n",buf);}7；exit(0);}