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108 lines
5.3 KiB
C
108 lines
5.3 KiB
C
/***************************************************************************
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* nsock_engines.c -- This contains the functions and definitions to *
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* manage the list of available IO engines. Each IO engine leverages a *
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* specific IO notification function to wait for events. Nsock will try *
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* to use the most efficient engine for your system. *
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* *
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***********************IMPORTANT NSOCK LICENSE TERMS***********************
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* *
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* The nsock parallel socket event library is (C) 1999-2012 Insecure.Com *
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* LLC This library is free software; you may redistribute and/or *
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* modify it under the terms of the GNU General Public License as *
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* published by the Free Software Foundation; Version 2. This guarantees *
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* your right to use, modify, and redistribute this software under certain *
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* conditions. If this license is unacceptable to you, Insecure.Com LLC *
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* may be willing to sell alternative licenses (contact *
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* sales@insecure.com ). *
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* *
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* As a special exception to the GPL terms, Insecure.Com LLC grants *
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* permission to link the code of this program with any version of the *
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* OpenSSL library which is distributed under a license identical to that *
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* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* linked combinations including the two. You must obey the GNU GPL in all *
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* respects for all of the code used other than OpenSSL. If you modify *
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* this file, you may extend this exception to your version of the file, *
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* but you are not obligated to do so. *
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* *
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* If you received these files with a written license agreement stating *
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* terms other than the (GPL) terms above, then that alternative license *
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* agreement takes precedence over this comment. *
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* *
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* Source is provided to this software because we believe users have a *
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* right to know exactly what a program is going to do before they run it. *
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* This also allows you to audit the software for security holes (none *
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* have been found so far). *
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* *
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* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* and add new features. You are highly encouraged to send your changes *
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* to nmap-dev@insecure.org for possible incorporation into the main *
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* distribution. By sending these changes to Fyodor or one of the *
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* Insecure.Org development mailing lists, it is assumed that you are *
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* offering the Nmap Project (Insecure.Com LLC) the unlimited, *
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* non-exclusive right to reuse, modify, and relicense the code. Nmap *
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* will always be available Open Source, but this is important because the *
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* inability to relicense code has caused devastating problems for other *
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* Free Software projects (such as KDE and NASM). We also occasionally *
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* relicense the code to third parties as discussed above. If you wish to *
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* specify special license conditions of your contributions, just say so *
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* when you send them. *
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* *
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* This program is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License v2.0 for more details *
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* (http://www.gnu.org/licenses/gpl-2.0.html). *
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* *
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***************************************************************************/
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/* $Id$ */
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#ifdef HAVE_CONFIG_H
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#include "nsock_config.h"
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#endif
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#include "nsock_internal.h"
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#if HAVE_EPOLL
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extern struct io_engine engine_epoll;
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#define ENGINE_EPOLL &engine_epoll,
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#else
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#define ENGINE_EPOLL
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#endif /* HAVE_EPOLL */
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/* select() based engine is the fallback engine, we assume it's always available */
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extern struct io_engine engine_select;
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#define ENGINE_SELECT &engine_select,
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/* Available IO engines. This depends on which IO management interfaces are
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* available on your system. Engines must be sorted by order of preference */
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static struct io_engine *available_engines[] = {
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ENGINE_EPOLL
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ENGINE_SELECT
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NULL
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};
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struct io_engine *get_io_engine(const char *engine_hint) {
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struct io_engine *engine = NULL;
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int i;
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if (!engine_hint) {
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engine = available_engines[0];
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} else {
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for (i = 0; available_engines[i] != NULL; i++)
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if (strcmp(engine_hint, available_engines[i]->name) == 0) {
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engine = available_engines[i];
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break;
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}
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}
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if (!engine)
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fatal("No suitable IO engine found! (%s)\n",
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engine_hint ? engine_hint : "no hint");
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return engine;
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}
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