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class method
Socket.getaddrinfo
Socket.getaddrinfo(nodename, servname[, family[, socktype[, protocol[, flags[, reverse_lookup]]]]]) => array
ext/socket/socket.c
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static VALUE
sock_s_getaddrinfo(int argc, VALUE *argv, VALUE _)
{
VALUE host, port, family, socktype, protocol, flags, ret, revlookup;
struct addrinfo hints;
struct rb_addrinfo *res;
int norevlookup;
rb_scan_args(argc, argv, "25", &host, &port, &family, &socktype, &protocol, &flags, &revlookup);
MEMZERO(&hints, struct addrinfo, 1);
hints.ai_family = NIL_P(family) ? PF_UNSPEC : rsock_family_arg(family);
if (!NIL_P(socktype)) {
hints.ai_socktype = rsock_socktype_arg(socktype);
}
if (!NIL_P(protocol)) {
hints.ai_protocol = NUM2INT(protocol);
}
if (!NIL_P(flags)) {
hints.ai_flags = NUM2INT(flags);
}
if (NIL_P(revlookup) || !rsock_revlookup_flag(revlookup, &norevlookup)) {
norevlookup = rsock_do_not_reverse_lookup;
}
res = rsock_getaddrinfo(host, port, &hints, 0);
ret = make_addrinfo(res, norevlookup);
rb_freeaddrinfo(res);
return ret;
}
Obtains address information for nodename:servname.
Note that Addrinfo.getaddrinfo provides the same functionality in an object oriented style.
family should be an address family such as: :INET, :INET6, etc.
socktype should be a socket type such as: :STREAM, :DGRAM, :RAW, etc.
protocol should be a protocol defined in the family, and defaults to 0 for the family.
flags should be bitwise OR of Socket::AI_* constants.
Example
Socket.getaddrinfo("www.ruby-lang.org", "http", nil, :STREAM) #=> [["AF_INET", 80, "carbon.ruby-lang.org", "221.186.184.68", 2, 1, 6]] # PF_INET/SOCK_STREAM/IPPROTO_TCP Socket.getaddrinfo("localhost", nil) #=> [["AF_INET", 0, "localhost", "127.0.0.1", 2, 1, 6], # PF_INET/SOCK_STREAM/IPPROTO_TCP # ["AF_INET", 0, "localhost", "127.0.0.1", 2, 2, 17], # PF_INET/SOCK_DGRAM/IPPROTO_UDP # ["AF_INET", 0, "localhost", "127.0.0.1", 2, 3, 0]] # PF_INET/SOCK_RAW/IPPROTO_IP
reverse_lookup directs the form of the third element, and has to be one of below. If reverse_lookup is omitted, the default value is nil.
+true+, +:hostname+: hostname is obtained from numeric address using reverse lookup, which may take a time. +false+, +:numeric+: hostname is same as numeric address. +nil+: obey to the current +do_not_reverse_lookup+ flag.
If Addrinfo object is preferred, use Addrinfo.getaddrinfo.