IO复用select实现

 1 #include<unistd.h>
 2 #include<stdio.h>
 3 #include<sys/select.h>
 4 #include<sys/socket.h>
 5 #include<netinet/in.h>
 6 #include<string.h>
 7 #include<stdlib.h>
 8 #include<assert.h>
 9 
10 #define SERVER_IP "127.0.0.1"
11 #define SERVER_PORT 9090
12 
13 #define LISTEN_QUEUE_SIZE  5
14 
15 void Perror(char *error)
16 {
17     perror(error);
18     exit(1);
19 }
20 
21 int Startup(char *ip, short port)
22 {
23     int sockfd = socket(AF_INET, SOCK_STREAM, 0);
24     if(sockfd == -1)
25         Perror("socket");
26 
27     short ser_port = port;
28     char *ser_ip = ip;
29 
30     struct sockaddr_in addrSer;
31     addrSer.sin_family = AF_INET;
32     addrSer.sin_port = htons(ser_port);
33     addrSer.sin_addr.s_addr = inet_addr(ser_ip);
34 
35 
36     int yes = 1;
37     setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
38 
39     socklen_t len = sizeof(struct sockaddr);
40     int res = bind(sockfd, (struct sockaddr*)&addrSer, len);
41     if(res == -1)
42         Perror("bind");
43     res = listen(sockfd, LISTEN_QUEUE_SIZE);
44     if(res == -1)
45         Perror("listen");
46 
47     return sockfd;
48 }
49 
50 
51 ye

 1  #include"utili.h"
 2 
 3 //select ip port
 4 
 5 #define MAX_CLIENT_NUM 50000
 6 
 7 void handler_msg(int sockConn)
 8 {
 9     char buffer[256];
10     recv(sockConn, buffer, 256, 0);
11     printf("cli msg:> %s\n",buffer);
12     send(sockConn, buffer, strlen(buffer)+1, 0);
13 }
14 
15 
16 
17 int main(int argc, char *argv[])
18 {
19     assert(argc == 3);
20     short port = atoi(argv[2]);
21     int sockSer = Startup(argv[1], port);
22 
23     int client_fd[MAX_CLIENT_NUM] = {0};
24     fd_set readset;
25 
26     int max_sock = sockSer;
27     int conn_num = 0;
28     int i;
29     while(1)
30     {
31         FD_ZERO(&readset);
32         FD_SET(sockSer, &readset);
33         for(i=0; i<MAX_CLIENT_NUM; ++i)
34         {
35             if(client_fd[i] != 0)
36             {
37                 FD_SET(client_fd[i], &readset);
38             }
39         }
40         printf("select waiting......\n");
41         int res = select(max_sock+1, &readset, NULL, NULL, NULL);
42         printf("select wakeup.......\n");
43         if(res == -1)
44         {
45             perror("select");
46             continue;
47         }
48         else if(res == 0)
49         {
50             printf("select Time Out.\n");
51             continue;
52         }
53         else
54         {
55             //1
56             if(FD_ISSET(sockSer, &readset))
57             {
58                 struct sockaddr_in addrCli;
59                 socklen_t len = sizeof(struct sockaddr);
60                 int sockConn = accept(sockSer, (struct sockaddr*)&addrCli, &len);
61                 if(sockConn == -1)
62                 {
63                     printf("Server Accept Client Connect Fail.\n");
64                 }
65                 else
66                 {
67                     printf("Server Accept Client Connect OK.\n");
68                     client_fd[conn_num++] = sockConn;
69 
70                     if(sockConn > max_sock)
71                         max_sock = sockConn;
72                 }
73                 continue;
74             }
75 
76             for(i=0; i<conn_num; ++i)
77             {
78                 if(FD_ISSET(client_fd[i], &readset))
79                 {
80                     handler_msg(client_fd[i]);
81                 }
82             }
83         }
84 
85     }
86     
87     return 0;
88 }