Jeff Hill
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*************************************************************************\
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* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
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* National Laboratory.
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* Copyright (c) 2002 The Regents of the University of California, as
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* Operator of Los Alamos National Laboratory.
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* EPICS BASE Versions 3.13.7
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* and higher are distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/*
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* $Id$
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* Author: Jeff Hill
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <io.h>
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#include <fcntl.h>
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#include <sys\stat.h>
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#define epicsExportSharedSymbols
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#include <epicsStdio.h>
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//
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// epicsTmpFile
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//
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// allow the teporary file directory to be set with the
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// TMP environment varianble
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//
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extern "C"
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epicsShareFunc FILE * epicsShareAPI epicsTempFile ( void )
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{
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// Allow the TMP env variable to set the location
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// where temporary files live.
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char * pName = _tempnam ( "c:\\tmp", "epics" );
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if( ! pName ) {
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return 0;
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}
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// We use open followed by fdopen so that the _O_EXCL
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// flag can be used. This causes detection of a race
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// condition where two programs end up receiving the
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// same temporary file name.
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//
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// _O_CREAT create if non-existant
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// _O_EXCL file must not exist
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// _O_RDWR read and write the file
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// _O_TEMPORARY delete file on close
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// _O_BINARY no translation
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// _O_SHORT_LIVED avoid flush to disk
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//
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const int openFlag = _O_CREAT | _O_EXCL | _O_RDWR |
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_O_SHORT_LIVED | _O_BINARY | _O_TEMPORARY;
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int fd = open ( pName, openFlag, _S_IWRITE );
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if ( fd < 0 ) {
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printf (
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"Temporary file \"%s\" open failed because "
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"\"%s\"\n", pName, strerror ( errno ) );
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return 0;
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}
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free ( pName );
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return fdopen ( fd, "w+bTD" );
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}
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