SOCK服务器#include<sys/types.h>#include<sys/socket.h>#unclude<stdio.h>#include<stdlib.h>#unclude<errno.h>#unclude<string.h>#unclude<uniste.h>#unclude<netinet/in.h>Main(){insockfd,new_fd,numbytes;Strucksockaddr_inmy_addr;Strucksockaddr_intheir_addr;Intsin_size;Charbuff[100];If((sockfd=sock(AF_INET,SOCK_STREAM,0))==-1)}perror("socket");Exit(1);}Printf("sockSuccess!,sockfd=%d\n",sockfd);My_addr.sin_family=AF_INET;);My_addr,sin_port=htons(4321);My_addr.sin_addr.s_addr=INADDR_ANY;Bzero(&(my_addr.sin_zero),8);If(bind(sockfd,(structsockaddr*)&my_addr,sizeof(strucksockaddr))==-1){perror("bind");Ext(1);}Printf("bindsuccess!\n");If(listen(sockfd,10)==-1){perror("listen");exit(1);}Peintf("listening...\n");While(1){sin_size=sizeof(strucksockaddr_in);If(new_fd=accept(sockfd,(strucksockaddr*)&their_addr,&sin_size))==-1){perror("accept");Exit(1);}If((numbytes=recv(new_fb,buff,strlen(buff),0))==-1){perroe("recv");Exit(1);}Printf(%s\n,buff);If(send(new_fd,"Welcome,ThisisServer.",strlen(buff),0)==-1)Preeor("send");Close(new_fd);Exit(0);}}close(sockfd);}创建文件，对文件进行读写#include<unistd.h>#include<sys/types.h>#include<sys/stst.h>#include<fcntl.h>#include<stdlib.h>#include<stdio.h>#include<string.h>#defineMAXSIZEIntmain(void){intfd;Fd=open_file();Write_file(fd);Resd_file(fd);Exit_file(fd);}Intopen_file(){intfd;Fd=open("/tmp/aabb.c",O_GREAT|O_TRUNC|O_RDWR,0666);Printf("openfile:aabb.c,fd=%d\n",fd);Return(fd);}Intwrite_file(intfd){inti,size,len;Char*buf="Hello!I'mwritingtothisfile!";Len=strlen(buf);Size=write(fd,buf,len);Printf("Write:%s\n",buf);Return0;}Intread_file(int_fd){charbuf_r[10];Buf_r[10]='\0';Intsize;Lseek(fd,buf_r,10);Printf("readfromfile:%s\n",buf_r);Return0;}Close(fd);Printf("Closeaabb.c\n");Exit(0);}NORFlash和NANDFlash的区别NORFlashNANDFlash接口时序同SRAM，易使用地址、数据线复用，数据位较窄读取速度较快读取速度较慢写入速度慢写入速度快随机存取速度较快，支持XIP(eXecuteInPlace芯片内执行），适用于代码存储。在嵌入式系统中，常用于存放引导程序、根文件系统等顺序读取速度较快，随机存储较慢，适用于数据存储（如大量的多媒体有用）。在嵌入式新系统