用c语言实现Linux中的pushd+n功能
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发布时间：2022-04-20 17:19
共1个回答
热心网友
时间：2023-06-22 22:30
（1）通过socket()函数创建socket
（2）通过bind函数绑定socket于设备地址
（3）进行读写操作read/recv/recvfrom write/send/sendto
（4）close方法关闭套接字
例子如下：
test1.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(void)
{
//create socket
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if(fd==-1)
{
perror("socket\n");
exit(-1);
}
printf("socket fd=%d\n",fd);
//build connection address
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(6666);
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
int r;
r = bind(fd,(struct sockaddr*)&addr,sizeof(addr));
if(r==-1)
{
perror("bind");
close(fd);
exit(-1);
}
printf("bind address successful!\n");
//accept or send message
char buf[255];
struct sockaddr_in from;
socklen_t len;
len = sizeof(from);
while(1)
{
r = recvfrom(fd,buf,sizeof(buf)-1,0,(struct sockaddr*)&from,&len);
if(r>0)
{
buf[r]=0;
printf("The message from %s is:%s\n",inet_ntoa(from.sin_addr),buf);
}
else
{
break;
}
}
//close socket
close(fd);
return 0;
}
test2.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(void)
{
//create socket
int fd = socket(AF_INET,SOCK_DGRAM,0);
if(fd==-1)
{
perror("socket");
exit(-1);
}
printf("create socket OK!\n");
//create an send address
struct sockaddr_in addr={};
addr.sin_family = AF_INET;
addr.sin_port = htons(6666);
addr.sin_addr.s_addr=inet_addr("127.0.0.1");
//send the message to the specify address
int r;
char buf[255];
while(1)
{
r = read(0,buf,sizeof(buf)-1);
if(r<=0)
break;
sendto(fd,buf,r,0,(struct sockaddr*)&addr,sizeof(addr));
}
//close socket
close(fd);
return 0;
}
先运行test1.c，然后运行test2.c，在test2.c运行后输入内容，在test1.c所在终端中就会显示信息
运行结果如下：追问运行结果可以截图给我看下吗
