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100 lines
5.2 KiB
100 lines
5.2 KiB
4 years ago
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/***************************************************************************/
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/* */
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/* Project: OpenSLP - OpenSource implementation of Service Location */
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/* Protocol */
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/* */
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/* File: slplib_xid.c */
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/* */
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/* Abstract: Internal implementation for generating unique XIDs. */
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/* Provides functions that are supposed to generate 16-bit */
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/* values that won't be generated for a long time in this */
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/* process and hopefully won't be generated by other process */
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/* for a long time. */
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/* */
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/*-------------------------------------------------------------------------*/
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/* */
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/* Please submit patches to http://www.openslp.org */
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/* */
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/*-------------------------------------------------------------------------*/
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/* */
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/* Copyright (C) 2000 Caldera Systems, Inc */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without */
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/* modification, are permitted provided that the following conditions are */
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/* met: */
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/* */
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/* Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* */
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/* Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in */
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/* the documentation and/or other materials provided with the */
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/* distribution. */
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/* */
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/* Neither the name of Caldera Systems nor the names of its */
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/* contributors may be used to endorse or promote products derived */
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/* from this software without specific prior written permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
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/* `AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
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/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */
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/* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE CALDERA */
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/* SYSTEMS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
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/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
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/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */
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/* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/***************************************************************************/
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <stdlib.h>
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#else
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#include <stdlib.h>
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#include <unistd.h>
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#endif
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#include "slp_xid.h"
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#include "slp_pid.h"
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/*=========================================================================*/
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int G_Xid = 0;
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/* Global variable that is incremented before SLPGenerateXid() returns */
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/*=========================================================================*/
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/*=========================================================================*/
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void SLPXidSeed()
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/* Seeds the XID generator. Should only be called 1 time per process! */
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/* currently called when the first handle is opened. */
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/*=========================================================================*/
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{
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/* Generate a random start*/
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#ifdef _WIN32
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srand(SLPPidGet() | G_Xid);
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G_Xid = (unsigned short)rand();
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#else
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srandom(SLPPidGet() | G_Xid);
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G_Xid = (unsigned short)random();
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#endif
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}
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/*=========================================================================*/
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unsigned short SLPXidGenerate()
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/* */
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/* Returns: A 16-bit value */
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/*=========================================================================*/
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{
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G_Xid++;
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return G_Xid;
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}
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