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