gecko-dev/include/unix-dns.h
1998-03-28 02:44:41 +00:00

72 lines
2.6 KiB
C

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*
* dns.h --- portable nonblocking DNS for Unix
* Created: Jamie Zawinski <jwz@netscape.com>, 19-Dec-96.
*/
#ifndef __UNIX_DNS_H__
#define __UNIX_DNS_H__
/* Kick off an async DNS lookup;
The returned value is an id representing this transaction;
the result_callback will be run (in the main process) when we
have a result. Returns negative if something went wrong.
If `status' is negative,`result' is an error message.
If `status' is positive, `result' is a 4-character string of
the IP address.
If `status' is 0, then the lookup was prematurely aborted
via a call to DNS_AbortHostLookup().
*/
extern int DNS_AsyncLookupHost(const char *name,
int (*result_callback) (void *id,
void *closure,
int status,
const char *result),
void *closure,
void **id_return);
/* Prematurely give up on the given host-lookup transaction.
The `id' is what was returned by DNS_AsyncLookupHost.
This causes the result_callback to be called with a negative
status.
*/
extern int DNS_AbortHostLookup(void *id);
/* Call this from main() to initialize the async DNS library.
Returns a file descriptor that should be selected for, or
negative if something went wrong. Pass it the argc/argv
that your `main' was called with (it needs these pointers
in order to give its forked subprocesses sensible names.)
*/
extern int DNS_SpawnProcess(int argc, char **argv);
/* The main select() loop of your program should call this when the fd
that was returned by DNS_SpawnProcess comes active. This may cause
some of the result_callback functions to run.
If this returns negative, then a fatal error has happened, and you
should close `fd' and not select() for it again. Call gethostbyname()
in the foreground or something.
*/
extern int DNS_ServiceProcess(int fd);
#endif /* __UNIX_DNS_H__ */