1 /* include udp_server */
2 #include "unp.h"
3
4 int
udp_server_reuseaddr(const char * host,const char * serv,socklen_t * addrlenp)5 udp_server_reuseaddr(const char *host, const char *serv, socklen_t *addrlenp)
6 {
7 int sockfd, n;
8 const int on = 1;
9 struct addrinfo hints, *res, *ressave;
10
11 bzero(&hints, sizeof(struct addrinfo));
12 hints.ai_flags = AI_PASSIVE;
13 hints.ai_family = AF_UNSPEC;
14 hints.ai_socktype = SOCK_DGRAM;
15
16 if ( (n = getaddrinfo(host, serv, &hints, &res)) != 0)
17 err_quit("udp_server error for %s, %s: %s",
18 host, serv, gai_strerror(n));
19 ressave = res;
20
21 do {
22 sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
23 if (sockfd < 0)
24 continue; /* error, try next one */
25
26 Setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
27 if (bind(sockfd, res->ai_addr, res->ai_addrlen) == 0)
28 break; /* success */
29
30 Close(sockfd); /* bind error, close and try next one */
31 } while ( (res = res->ai_next) != NULL);
32
33 if (res == NULL) /* errno from final socket() or bind() */
34 err_sys("udp_server error for %s, %s", host, serv);
35
36 if (addrlenp)
37 *addrlenp = res->ai_addrlen; /* return size of protocol address */
38
39 freeaddrinfo(ressave);
40
41 return(sockfd);
42 }
43 /* end udp_server */
44
45 int
Udp_server_reuseaddr(const char * host,const char * serv,socklen_t * addrlenp)46 Udp_server_reuseaddr(const char *host, const char *serv, socklen_t *addrlenp)
47 {
48 return(udp_server_reuseaddr(host, serv, addrlenp));
49 }
50