55 lines
5.5 KiB
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55 lines
5.5 KiB
HTML
<!-- 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: Function PROBE-FILE</TITLE>
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<A NAME="probe-file"><I>Function</I> <B>PROBE-FILE</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>probe-file</B> <I>pathspec</I> => <I>truename</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>pathspec</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#pathname_designator"><I>pathname designator</I></A>. <P>
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<I>truename</I>---a <A REL=DEFINITION HREF="26_glo_p.htm#physical_pathname"><I>physical pathname</I></A> or <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="#probe-file"><B>probe-file</B></A> tests whether a file exists. <P>
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<A REL=DEFINITION HREF="#probe-file"><B>probe-file</B></A> returns <A REL=DEFINITION HREF="26_glo_f.htm#false"><I>false</I></A> if there is no file named <I>pathspec</I>, and otherwise returns the <A REL=DEFINITION HREF="26_glo_t.htm#truename"><I>truename</I></A> of <I>pathspec</I>. <P>
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If the <I>pathspec</I> <A REL=DEFINITION HREF="26_glo_d.htm#designator"><I>designator</I></A> is an open <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A>, then <A REL=DEFINITION HREF="#probe-file"><B>probe-file</B></A> produces the <A REL=DEFINITION HREF="26_glo_t.htm#truename"><I>truename</I></A> of its associated <A REL=DEFINITION HREF="26_glo_f.htm#file"><I>file</I></A>. If <I>pathspec</I> is a <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>stream</I></A>, whether open or closed, it is coerced to a <A REL=DEFINITION HREF="26_glo_p.htm#pathname"><I>pathname</I></A> as if by the <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> <A REL=DEFINITION HREF="f_pn.htm#pathname"><B>pathname</B></A>. <P>
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<P><B>Examples:</B> None.
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<P>
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<P><B>Affected By:</B><P>
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<P>
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The host computer's file system. <P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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An error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_file_e.htm#file-error"><B>file-error</B></A> is signaled if <I>pathspec</I> is <A REL=DEFINITION HREF="26_glo_w.htm#wild"><I>wild</I></A>. <P>
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An error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_file_e.htm#file-error"><B>file-error</B></A> is signaled if the <A REL=DEFINITION HREF="26_glo_f.htm#file_system"><I>file system</I></A> cannot perform the requested operation. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_tn.htm#truename"><B>truename</B></A>, <A REL=DEFINITION HREF="f_open.htm#open"><B>open</B></A>, <A REL=DEFINITION HREF="f_ensu_1.htm#ensure-directories-exist"><B>ensure-directories-exist</B></A>, <A REL=DEFINITION HREF="t_pn.htm#pathname"><B>pathname</B></A>, <A REL=DEFINITION HREF="t_logica.htm#logical-pathname"><B>logical-pathname</B></A>, <A REL=CHILD HREF="20_a.htm">Section 20.1 (File System Concepts)</A>, <A REL=CHILD HREF="20_ab.htm">Section 20.1.2 (File Operations on Open and Closed Streams)</A>, <A REL=CHILD HREF="19_ab.htm">Section 19.1.2 (Pathnames as Filenames)</A> <P>
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<P><B>Notes:</B> None.
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<P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss267.htm">PATHNAME-WILD:NEW-FUNCTIONS</A><LI> <A REL=CHILD HREF="../Issues/iss157.htm">FILE-OPEN-ERROR:SIGNAL-FILE-ERROR</A><LI> <A REL=CHILD HREF="../Issues/iss053.htm">CLOSED-STREAM-OPERATIONS:ALLOW-INQUIRY</A><LI> <A REL=CHILD HREF="../Issues/iss259.htm">PATHNAME-LOGICAL:ADD</A><P></UL><HR>
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