33 lines
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33 lines
4.1 KiB
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Section 21.1.1.1.2</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="21_aaaa.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="21_aaa.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="21_aaac.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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21.1.1.1.2 Open and Closed Streams</H2> <P>
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<A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>Streams</I></A> are either <A REL=DEFINITION HREF="26_glo_o.htm#open"><I>open</I></A> or <A REL=DEFINITION HREF="26_glo_c.htm#closed"><I>closed</I></A>. <P>
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Except as explicitly specified otherwise, operations that create and return <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>streams</I></A> return <A REL=DEFINITION HREF="26_glo_o.htm#open"><I>open</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>streams</I></A>. <P>
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The action of <I>closing</I> a <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> marks the end of its use as a source or sink of data, permitting the <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> to reclaim its internal data structures, and to free any external resources which might have been locked by the <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> when it was opened. <P>
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Except as explicitly specified otherwise, the consequences are undefined when a <A REL=DEFINITION HREF="26_glo_c.htm#closed"><I>closed</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> is used where a <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> is called for. <P>
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Coercion of <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>streams</I></A> to <A REL=DEFINITION HREF="26_glo_p.htm#pathname"><I>pathnames</I></A> is permissible for <A REL=DEFINITION HREF="26_glo_c.htm#closed"><I>closed</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>streams</I></A>; in some situations, such as for a <A REL=DEFINITION HREF="26_glo_t.htm#truename"><I>truename</I></A> computation, the result might be different for an <A REL=DEFINITION HREF="26_glo_o.htm#open"><I>open</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> and for that same <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> once it has been <A REL=DEFINITION HREF="26_glo_c.htm#closed"><I>closed</I></A>. <P>
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<A REL=NAVIGATOR HREF="../Front/StartPts.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Starting Points]" SRC="../Graphics/StartPts.gif" ALIGN=Bottom></A><A REL=TOC HREF="../Front/Contents.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Contents]" SRC="../Graphics/Contents.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Master.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Index]" SRC="../Graphics/Index.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Symbol.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Symbols]" SRC="../Graphics/Symbols.gif" ALIGN=Bottom></A><A REL=GLOSSARY HREF="../Body/26_a.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Glossary]" SRC="../Graphics/Glossary.gif" ALIGN=Bottom></A><A HREF="../Front/X3J13Iss.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Issues]" SRC="../Graphics/Issues.gif" ALIGN=Bottom></A><BR>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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