1 #include <stdio.h>
  2 #include                                                                                                                   
  3 #include                                                                                                               
  4 #include                                                                                                               
  5 #include                                                                                                                
  6                                                                                                                                      
  7 int                                                                                                                                  
  8 main(int argc, char **argv) {                                                                                                        
  9         if (argc != 2) {                                                                                                             
 10                 printf("選擇一個需要測試的端口, Please!\n");                                                                         
 11                 return 0;                                                                                                            
 12         }                                                                                                                            
 13         int fd = socket(AF_INET, SOCK_STREAM, 0);                                                                                    
 14         if (fd < 0) {                                                                                                                
 15                 perror(*argv);                                                                                                       
 16                 return 0;                                                                                                            
 17         }                                                                                                                            
 18         struct sockaddr_in addr = { 0 };                                                                                             
 19         addr.sin_family = AF_INET;                                                                                                   
 20         int port;                                                                                                                    
 21         if (sscanf(argv[1], "%d", &port) == 0) {                                                                                     
 22                 printf("端口號錯誤!\n");                                                                                             
 23                 return 0;                                                                                                            
 24         }                                                                                                                            
 25         printf("INFO: port %d\n", port);                                                                                             
 26         addr.sin_port = htons(port);                                                                                                 
 27         addr.sin_addr.s_addr = inet_addr("0.0.0.0");                                                                                 
 28         if (bind(fd, (void *)&addr, sizeof addr) != 0) {                                                                             
 29                 perror(*argv);                                                                                                       
 30                 return 0;                                                                                                            
 31         }                                                                                                                            
 32         if (listen(fd, 10) != 0) {                                                                                                   
 33                 perror(*argv);                                                                                                       
 34                 return 0;                                                                                                            
 35         }                                                                                                                            
 36         while (1) {                                                                                                                  
 37                 int conn = accept(fd, NULL, NULL);                                                                                   
 38                 write(conn, "Hello", 5);                                                                                             
 39                 close(conn);                                                                                                         
 40         }                                                                                                                            
 41         return 0;                                                                                                                    
 42 }                                                                                                                                    
 43