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<TITLE>Tk::IO - high level interface to Tk's 'fileevent' mechanism</TITLE>
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<STRONG><P CLASS=block> Tk::IO - high level interface to Tk's 'fileevent' mechanism</P></STRONG>
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<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#warning">WARNING</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#bugs">BUGS</A></LI>
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<H1><A NAME="name">NAME</A></H1>
<P>Tk::IO - high level interface to Tk's 'fileevent' mechanism</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
my $fh = Tk::IO->new(-linecommand => callback, -childcommand => callback);
$fh->exec("command")
$fh->wait
$fh->kill</PRE>
<P>
<HR>
<H1><A NAME="warning">WARNING</A></H1>
<P>INTERFACES TO THIS MODULE MAY CHANGE AS PERL'S IO EVOLVES
AND WITH PORT OF TK4.1</P>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>Tk::IO is now layered on perl's IO::Handle class. Interfaces
have changed, and are still evolving.</P>
<P>In theory C methods which enable non-blocking IO as in earlier Tk-b*
<CODE>release(s)</CODE> are still there. I have not changed them to use perl's
additional Configure information, or tested them much.</P>
<P>Assumption is that <STRONG>exec</STRONG> is
used to fork a child process and a callback is called each time a
complete line arrives up the implied pipe.</P>
<P>``line'' should probably be defined in terms of perl's input record
separator but is not yet.</P>
<P>The -childcommand callback is called when end-of-file occurs.</P>
<P>$fh-><STRONG>wait</STRONG> can be used to wait for child process while processing
other Tk events.</P>
<P>$fh-><STRONG>kill</STRONG> can be used to send signal to child process.</P>
<P>
<HR>
<H1><A NAME="bugs">BUGS</A></H1>
<P>Still not finished.
Idea is to use ``exec'' to emulate ``system'' in a non-blocking manner.</P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Tk::IO - high level interface to Tk's 'fileevent' mechanism</P></STRONG>
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