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5.5 KiB
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57 lines
5.5 KiB
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<TITLE>CLHS: Variable *TERMINAL-IO*</TITLE>
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<A NAME="STterminal-ioST"><I>Variable</I> <B>*TERMINAL-IO*</B></A> <P>
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<P><B>Value Type:</B><P>
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<P>
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a <A REL=DEFINITION HREF="26_glo_b.htm#bidirectional"><I>bidirectional</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A>. <P>
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<P><B>Initial Value:</B><P>
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<P>
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<A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A>, but it must be 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> that is not a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_synonym_stream"><I>generalized synonym stream</I></A> to an <A REL=DEFINITION HREF="26_glo_i.htm#iSLo_customization_variable"><I>I/O customization variables</I></A> but that might be a <A REL=DEFINITION HREF="26_glo_g.htm#generalized_synonym_stream"><I>generalized synonym stream</I></A> to the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of some <A REL=DEFINITION HREF="26_glo_i.htm#iSLo_customization_variable"><I>I/O customization variable</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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The <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STterminal-ioST"><B>*terminal-io*</B></A>, called <A REL=DEFINITION HREF="26_glo_t.htm#terminal_iSLo"><I>terminal I/O</I></A>, is ordinarily a <A REL=DEFINITION HREF="26_glo_b.htm#bidirectional"><I>bidirectional</I></A> <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> that connects to the user's console. Typically, writing to this <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> would cause the output to appear on a display screen, for example, and reading from the <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A> would accept input from a keyboard. It is intended that standard input functions such as <A REL=DEFINITION HREF="f_rd_rd.htm#read"><B>read</B></A> and <A REL=DEFINITION HREF="f_rd_cha.htm#read-char"><B>read-char</B></A>, when used with this <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A>, cause echoing of the input into the output side of the <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A>. The means by which this is accomplished are <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A>. <P>
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The effect of changing the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="#STterminal-ioST"><B>*terminal-io*</B></A>, either by <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A> or <I>assignment</I>, is <A REL=DEFINITION HREF="26_glo_i.htm#implementation-defined"><I>implementation-defined</I></A>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(progn (prin1 'foo) (prin1 'bar *terminal-io*))
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>> FOOBAR
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=> BAR
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(with-output-to-string (*standard-output*)
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(prin1 'foo)
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(prin1 'bar *terminal-io*))
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>> BAR
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=> "FOO"
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</PRE>
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</TT> <P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="v_debug_.htm#STdebug-ioST"><B>*debug-io*</B></A>, <A REL=DEFINITION HREF="v_debug_.htm#STerror-outputST"><B>*error-output*</B></A>, <A REL=DEFINITION HREF="v_debug_.htm#STquery-ioST"><B>*query-io*</B></A>, <A REL=DEFINITION HREF="v_debug_.htm#STstandard-inputST"><B>*standard-input*</B></A>, <A REL=DEFINITION HREF="v_debug_.htm#STstandard-outputST"><B>*standard-output*</B></A>, <A REL=DEFINITION HREF="v_debug_.htm#STtrace-outputST"><B>*trace-output*</B></A> <P>
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<P><B>Notes:</B> None.
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<P>
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