头书写一个tcp通信的实例
1、在虚拟机上新建tcp_server.c,代码如下:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define SERVER_PORT 3861
#define LISENT_NUM 10
int main(int argc, char * argv[])
{
int sfd, cfd;
struct sockaddr_in clientaddr;
struct sockaddr_in serverAddr;
char buff[1024];
int size = sizeof(struct sockaddr);
pthread_t client_thread[LISENT_NUM];
if((sfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("socket");
exit(-1);
}
memset(&serverAddr, 0, sizeof(struct sockaddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_addr.s_addr = INADDR_ANY;
serverAddr.sin_port = htons(SERVER_PORT);
if (bind(sfd, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr)) == -1)
{
perror("bind");
close(sfd);
exit(-1);
}
if(listen(sfd, LISENT_NUM) == -1)
{
perror("listen");
close(sfd);
exit(-1);
}
printf("#@ listen SERVER_PORT %d\\\\n", SERVER_PORT);
printf("main: server waiting connect...\\\\n");
if ((cfd = accept(sfd, (struct sockaddr *)&clientaddr, (socklen_t*)&size)) == -1)
{
perror("accept");
close(sfd);
return0;
}
printf("client (ip = %s : SERVER_PORT = %d) connect success\\\\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
while (1)
{
usleep(1000*10);
if (send(cfd, "hello MYD/YG2L", 6, MSG_NOSIGNAL) == -1)
{
perror("send");
exit(-1);
}
printf("send: hello MYD/YG2L\\\\n");
usleep(1000*10);
if(recv(cfd, buff, sizeof(buff), 0) == -1)
{
perror("recv");
exit(-1);
}
printf("receive: %s\\\\n", buff);
}
return0;
}
2、加载sdk:source /opt/yg2lx/environment-setup-aarch64-poky-linux
3、编译:
lugl@lugl-virtual-machine:~/MYDG2L$ $CC tcp_server.c -o tcp_server
In file included from /opt/yg2lx/sysroots/aarch64-poky-linux/usr/include/bits/libc-header-start.h:33,
from /opt/yg2lx/sysroots/aarch64-poky-linux/usr/include/stdio.h:27,
from tcp_server.c:1:
/opt/yg2lx/sysroots/aarch64-poky-linux/usr/include/features.h:397:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
# warning _FORTIFY_SOURCE requires compiling with optimization (-O)
4、上传到开发板,修改运行权限、运行:
root@myir-yg2lx:~# chmod 777 tcp_server
root@myir-yg2lx:~# ./tcp_server
#@ listen SERVER_PORT 3861
main: server waiting connect...
client (ip = 192.168.3.166 : SERVER_PORT = 53634) connect success
send: hello MYD/YG2L
receive: hello
send: hello MYD/YG2L
receive: hello
send: hello MYD/YG2L
receive: hello MYD
send: hello MYD/YG2L
5、打开网终调试助手,连接服务器后发送数据:
如上图,调试正常。
【总结】在安装好交叉编译环境后,就可以愉快的进行linux下的编程了。