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IPADDR_REMOTE(3) libdill Library Functions IPADDR_REMOTE(3) NAME ipaddr_remote - resolve the address of a remote IP endpoint SYNOPSIS #include <libdill.h> int ipaddr_remote( struct ipaddr* addr, const char* name, int port, int mode, int64_t deadline); DESCRIPTION Converts an IP address in human-readable format, or a name of a remote host into an ipaddr structure. Mode specifies which kind of addresses should be returned. Possible values are: • IPADDR_IPV4: Get IPv4 address. • IPADDR_IPV6: Get IPv6 address. • IPADDR_PREF_IPV4: Get IPv4 address if possible, IPv6 address other- wise. • IPADDR_PREF_IPV6: Get IPv6 address if possible, IPv4 address other- wise. Setting the argument to zero invokes default behaviour, which, at the present, is IPADDR_PREF_IPV4. However, in the future when IPv6 becomes more common it may be switched to IPADDR_PREF_IPV6. addr: Out parameter, The IP address object. name: Name of the remote IP endpoint, such as "www.example.org" or "192.168.0.111". port: Port number. Valid values are 1-65535. mode: What kind of address to return. See above. deadline: A point in time when the operation should time out, in mil- liseconds. Use the now function to get your current point in time. 0 means immediate timeout, i.e., perform the operation if possible or re- turn without blocking if not. -1 means no deadline, i.e., the call will block forever if the operation cannot be performed. This function is not available if libdill is compiled with --dis- able-sockets option. RETURN VALUE In case of success the function returns 0. In case of error it returns -1 and sets errno to one of the values below. ERRORS • EADDRNOTAVAIL: The name of the remote host cannot be resolved to an address of the specified type. • ECANCELED: Current coroutine was canceled. • ETIMEDOUT: Deadline was reached. EXAMPLE ipaddr addr; ipaddr_remote(&addr, "www.example.org", 80, 0, -1); int s = socket(ipaddr_family(addr), SOCK_STREAM, 0); connect(s, ipaddr_sockaddr(&addr), ipaddr_len(&addr)); SEE ALSO ipaddr_equal(3) ipaddr_family(3) ipaddr_len(3) ipaddr_local(3) ipad- dr_port(3) ipaddr_remotes(3) ipaddr_setport(3) ipaddr_sockaddr(3) ipad- dr_str(3) now(3) libdill IPADDR_REMOTE(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLE | SEE ALSO
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