Linux套接字(Socket)是在操作系统中用于进程间通信的机制。
socket函数对应于普通文件的打开操作。普通文件的打开操作返回一个文件描述字,而socket()用于创建一个socket描述符(socket descriptor),它唯一标识一个socket。这个socket描述字跟文件描述字一样,后续的操作都有用到它,把它作为参数,通过它来进行一些读写操作。
客户端代码模拟:
#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<sys/shm.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<sys/un.h>
int main(){
int sockfd ;
int len ;
struct sockaddr_un address ;
int result ;
char ch ='A';
sockfd = socket(AF_UNIX,SOCK_STREAM,0);
address.sun_family = AF_UNIX ;
strcpy(address.sun_path,"server_socket");
len = sizeof(address);
result = connect(sockfd,(struct sockaddr *)&address,len);
if(result ==-1){
printf("ops: client1 ret= %x\n",result);
perror("oops: client1 ");
exit(EXIT_FAILURE);
}
write(sockfd,&ch,1);
read(sockfd,&ch,1);
printf("char from server =%c\n",ch);
close(sockfd);
exit(0);
}
服务端代码模拟: 文章来源:https://www.toymoban.com/news/detail-819055.html
#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<sys/shm.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<sys/un.h>
int main(){
int server_sockfd , client_sockfd ;
int server_len,client_len ;
struct sockaddr_un server_address ;
struct sockaddr_un client_address ;
unlink("server_socket");
server_sockfd = socket(AF_UNIX,SOCK_STREAM,0);
server_address.sun_family =AF_UNIX ;
strcpy(server_address.sun_path,"server_socket");
server_len = sizeof(server_address);
bind(server_sockfd,(struct sockaddr * )&server_address,server_len);
listen(server_sockfd,5);
while (1)
{
char ch ;
printf("server waiting\n");
client_len = sizeof(client_address);
client_sockfd = accept(server_sockfd,
(struct sockaddr * )&client_address,(socklen_t *)&client_len);
read(client_sockfd,&ch,1);
ch++ ;
write(client_sockfd,&ch,1);
close(client_sockfd);
}
}
测试入口: 文章来源地址https://www.toymoban.com/news/detail-819055.html
#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<sys/shm.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<sys/un.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<netdb.h>
int main(int argc ,char *argv[]){
char *host , **names ,**addrs ;
struct hostent *hostinfo ;
if(argc ==1){
char myname[256];
gethostname(myname,255);
host = myname ;
}else {
host = argv[1] ;
}
hostinfo = gethostbyname(host);
if(!hostinfo){
fprintf(stderr,"cannot get info for host:%s\n",host);
exit(1);
}
printf("result for host : %s \n",host);
printf("Name: %s \n", hostinfo->h_name);
printf("Aliases:");
names = hostinfo->h_aliases ;
while (*names)
{
printf(" %s",*names);
names++ ;
}
printf("\n");
if(hostinfo->h_addrtype != AF_INET){
fprintf(stderr,"not an IP host \n ");
exit(1);
}
addrs = hostinfo -> h_addr_list ;
while (*addrs)
{
printf(" %s",inet_ntoa(*(struct in_addr *)*addrs));
addrs++ ;
}
printf("\n");
exit(0);
}
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