2 #include <sys/socket.h>
3 #include <netinet/in.h>
10 int getservbyport_r(int port, const char *prots,
11 struct servent *se, char *buf, size_t buflen, struct servent **res)
14 struct sockaddr_in sin = {
15 .sin_family = AF_INET,
20 int r = getservbyport_r(port, "tcp", se, buf, buflen, res);
21 if (r) r = getservbyport_r(port, "udp", se, buf, buflen, res);
27 i = (uintptr_t)buf & sizeof(char *)-1;
28 if (!i) i = sizeof(char *);
29 if (buflen < 3*sizeof(char *)-i)
31 buf += sizeof(char *)-i;
32 buflen -= sizeof(char *)-i;
34 if (strcmp(prots, "tcp") && strcmp(prots, "udp")) return EINVAL;
37 se->s_proto = (char *)prots;
38 se->s_aliases = (void *)buf;
39 buf += 2*sizeof(char *);
40 buflen -= 2*sizeof(char *);
42 se->s_aliases[0] = se->s_name = buf;
44 switch (getnameinfo((void *)&sin, sizeof sin, 0, 0, buf, buflen,
45 strcmp(prots, "udp") ? 0 : NI_DGRAM)) {
55 /* A numeric port string is not a service record. */
56 if (strtol(buf, 0, 10)==ntohs(port)) return ENOENT;