3 #include <sys/socket.h>
6 #include <netinet/in.h>
10 int gethostbyname2_r(const char *name, int af,
11 struct hostent *h, char *buf, size_t buflen,
12 struct hostent **res, int *err)
14 struct addrinfo hint = {
15 .ai_family = af==AF_INET6 ? af : AF_INET,
16 .ai_flags = AI_CANONNAME
18 struct addrinfo *ai, *p;
26 i = (uintptr_t)buf & sizeof(char *)-1;
28 if (buflen < sizeof(char *)-i) return ERANGE;
29 buf += sizeof(char *)-i;
30 buflen -= sizeof(char *)-i;
33 getaddrinfo(name, 0, &hint, &ai);
34 switch (getaddrinfo(name, 0, &hint, &ai)) {
36 *err = HOST_NOT_FOUND;
52 h->h_length = af==AF_INET6 ? 16 : 4;
54 canon = ai->ai_canonname ? ai->ai_canonname : name;
55 need = 4*sizeof(char *);
56 for (i=0, p=ai; p; i++, p=p->ai_next)
57 need += sizeof(char *) + h->h_length;
58 need += strlen(name)+1;
59 need += strlen(canon)+1;
66 h->h_aliases = (void *)buf;
67 buf += 3*sizeof(char *);
68 h->h_addr_list = (void *)buf;
69 buf += (i+1)*sizeof(char *);
71 h->h_name = h->h_aliases[0] = buf;
72 strcpy(h->h_name, canon);
73 buf += strlen(h->h_name)+1;
75 if (strcmp(h->h_name, name)) {
76 h->h_aliases[1] = buf;
77 strcpy(h->h_aliases[1], name);
78 buf += strlen(h->h_aliases[1])+1;
79 } else h->h_aliases[1] = 0;
83 for (i=0, p=ai; p; i++, p=p->ai_next) {
84 h->h_addr_list[i] = (void *)buf;
86 memcpy(h->h_addr_list[i],
87 &((struct sockaddr_in *)p->ai_addr)->sin_addr,
90 h->h_addr_list[i] = 0;