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annotate src/main.c @ 4:691358f944e8

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remove hardcoded host info
author Dennis <dennisconcepcionmartin@gmail.com>
date Tue, 18 Jul 2023 12:04:37 +0100
parents 052cf5cf100a
children 45bac89a4da3
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1 #include <signal.h>
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <unistd.h>
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5 #include <string.h>
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <netdb.h>
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9 #include <netinet/in.h>
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10 #include <arpa/inet.h>
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11 #include <time.h>
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14 int socketfd;
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17 void sig_handler(int sig_num) {
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18 if (sig_num == 2) {
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19 printf("\nClosing socket\n");
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20 close(socketfd);
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21 exit(0);
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22 }
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23 }
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25
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26 int main() {
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27
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28 signal(SIGINT, sig_handler);
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30 struct addrinfo hints;
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31 struct addrinfo *servinfo;
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33 memset(&hints, 0, sizeof hints); // Make sure the struct is empty
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34 hints.ai_family = AF_UNSPEC; // Don't care IPv4 or IPv6
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35 hints.ai_socktype = SOCK_STREAM; // TCP stream sockets
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36 hints.ai_flags = AI_PASSIVE; // Fill in my IP for me
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38 if ((getaddrinfo(NULL, "5050", &hints, &servinfo)) != 0) {
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39 perror("getaddrinfo: ");
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40 exit(1);
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41 }
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43 socketfd = socket(servinfo->ai_family, servinfo->ai_socktype, servinfo->ai_protocol);
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44
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45 if (socketfd == -1) {
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46 perror("socket: ");
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47 exit(1);
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48 }
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50 if (bind(socketfd, servinfo->ai_addr, servinfo->ai_addrlen) == -1) {
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51 perror("bind: ");
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52 exit(1);
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53 }
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54
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55 freeaddrinfo(servinfo);
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56
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57 if (listen(socketfd, 10) == -1) {
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58 perror("listen: ");
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59 exit(1);
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60 }
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61
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62 char send_buffer[100];
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63 struct sockaddr_storage clientinfo;
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64 socklen_t clientinfo_size;
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65
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66 printf("Waiting for connections...\n");
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67
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68 while (1) {
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69 int connfd = accept(socketfd, (struct sockaddr *)&clientinfo, &clientinfo_size);
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71 if (connfd == -1) {
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72 perror("accept: \n");
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73 exit(1);
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74 }
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75
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76 time_t now = time(NULL);
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77 snprintf(send_buffer, sizeof(send_buffer), "Server time: %s\n", ctime(&now));
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78 send(connfd, send_buffer, sizeof(send_buffer), 0);
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79 close(connfd);
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80 }
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81
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82 return 0;
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83 }