某一个时间再回来看 , 会不会感到这个很简单呢.

 1 #include<stdio.h>
 2 #include<string.h>
 3 #include<math.h>
 4 #include<iostream>
 5 #include<algorithm>
 6 #include<queue>
 7 #include<vector>
 8 #include<set>
 9 #include<stack>
10 #include<string>
11 #include<sstream>
12 #include<map>
13 #include<cctype>
14 #include<limits.h>
15 #include<stdlib.h>
16 #include<fstream>
17 #include<unistd.h>
18 #include<arpa/inet.h>
19 #include<windows.h>
20 #include<sys/scoket.h>
21 using namespace std;
22 int main()
23 {
24     int serv_sock,clnt_sock;
25     struct sockaddr_in serv_addr;
26     struct sockaddr_in clnt_addr;
27     socklen_t clnt_addr_size;
28     char message[]="hello world!";
29     if(argc!=2)
30     {
31         printf("Usage : %s <port>\n",argv[0]);
32         exit(1);
33     }
34     serv_sock=socket(PF_INET,SOCK_STREAM,0);
35     if(serv_sock==-1)
36         error_handling("socket() error");
37     memset(&serv_addr,0,sizeof(serv_addr));
38     serv_addr.sin_family=AF_INET;
39     serv_addr.sin_addr.s_addr=htonl(INADDR_ANY);
40     serv_addr.sin_port=htons(atoi(argv[1]));
41     if(bind(serv_sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr))==-1)
42         error_handling("bind() error");
43     if(listen(serv_sock,5)==-1)
44         error_handling("listen() error");
45     clnt_addr_size=sizeof(clnt_addr);
46     clnt_sock=accept(serv_sock,(struct sockaddr*)&clnt_addr,&clnt_addr_size);
47     if(clnt_sock==-1)
48         error_handling("accept() error");
49     write(clnt_sock,message,sizeof(message));
50     close(clnt_sock);
51     close(clnt_sock);
52     return 0;
53 }
54 void error_hangling(char *message)
55 {
56     fputs(message,stderr);
57     fputc(‘\n‘,stderr);
58     exit(1);
59 }