Linux 网络编程一步一步学（五）开启网络监听服务

    1 #include <stdio.h>
    2 #include <stdlib.h>
    3 #include <errno.h>
    4 #include <string.h>
    5 #include <sys/types.h>
    6 #include <netinet/in.h>
    7 #include <sys/socket.h>
    8 #include <sys/wait.h>
    9 #include <unistd.h>
   10 #include <arpa/inet.h>
   11 int main(int argc, char **argv)
-  12 {
|  13     int sockfd;
|  14     struct sockaddr_in my_addr;
|  15     unsigned int myport, lisnum;
|  16     if (argv[1])
|  17         myport = atoi(argv[1]);
|  18     else
|  19         myport = 7838;
|  20     if (argv[2])
|  21         lisnum = atoi(argv[2]);
|  22     else
|  23         lisnum = 2;
|  24     sockfd = socket(PF_INET, SOCK_STREAM, 0);
|  25     bzero(&my_addr, sizeof(my_addr));
|  26     my_addr.sin_family = PF_INET;
|  27     my_addr.sin_port = htons(myport);
|  28     if(argv[3])
|  29         my_addr.sin_addr.s_addr = inet_addr(argv[3]);
|  30     else
|  31         my_addr.sin_addr.s_addr = INADDR_ANY;
|  32     bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr));
-  33     if (listen(sockfd, lisnum) == -1) {
2  34         perror("listen");
2  35         exit(1);
2  36     }
|  37     else printf("begin listen\n");
|  38         sleep(100);
|  39     close(sockfd);
|  40     return 0;                                                                                                          
|  41 }