03-28-2008
host name to IP address
There's a piece in a C program I'm writing (Linux) that simply needs to take a host name and return an IP address (e.g., take 'mail.gnu.org' and return 199.232.76.166). I've gotten a successful status from getaddrinfo, but don't see any of the fields in the result structure that has what I'm looking for, and similar for the structure returned by gethostbyname. I'm wondering if I need to use a function like 'inet_addr' on one of those values to get what I'm looking for. Thank you.
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LEARN ABOUT ULTRIX
socket_from_name
socket_from_name(3ncs) socket_from_name(3ncs)
Name
socket_from_name - convert a name and port number to a socket address
Syntax
#include <idl/c/socket.h>
void socket_$from_name(family, name, nlength, port, sockaddr, slength, status)
unsigned long family;
socket_$string_t name;
unsigned long nlength;
unsigned long port;
socket_$addr_t *sockaddr;
unsigned long *slength;
status_$t *status;
Arguments
family The integer representation of an address family. Value can be socket_$internet or socket_$unspec If the family parameter is
socket_$unspec, then the name parameter is scanned for a prefix of family: (for example, ip:).
name A string in the format family:host[port], where family:, host, and [port] are all optional. The family is an address family. The
only valid family is ip. If you specify a family as part of the name parameter, you must specify socket_$unspec in the family
parameter. The host is a host name. A leading number sign (#) can be used to indicate that the host name is in the standard
numeric form (for example, #192.9.8.7). If host is omitted, the local host name is used. The port is a port number. If you spec-
ify a port as part of the name parameter, the port parameter is ignored.
nlength
The length, in bytes, of name.
port A port number. If you specify a port number in the name parameter, this parameter is ignored.
sockaddr
A socket address.
slength
The length, in bytes, of sockaddr.
status The completion status. If the completion status returned in is equal to status_$ok , then the routine that supplied it was success-
ful.
Description
The routine converts a textual address family, host name, and port number to a socket address. The address family and the port number can
be either specified as separate parameters or included in the name parameter.
Files
See Also
intro(3ncs), socket_family_from_name(3ncs), socket_to_name(3ncs)
socket_from_name(3ncs)