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U:RDoc::AnyMethod[iI" pipe:ETI" IO::pipe;TT: publico:RDoc::Markup::Document: @parts[o: RDoc::Markup::Paragraph; [I"DCreates a pair of pipe endpoints (connected to each other) and ;TI"Ereturns them as a two-element array of <code>IO</code> objects: ;TI"C<code>[</code> <i>read_io</i>, <i>write_io</i> <code>]</code>.;To: RDoc::Markup::BlankLine o; ; [ I"2If a block is given, the block is called and ;TI"%returns the value of the block. ;TI"L<i>read_io</i> and <i>write_io</i> are sent to the block as arguments. ;TI"SIf read_io and write_io are not closed when the block exits, they are closed. ;TI"Ai.e. closing read_io and/or write_io doesn't cause an error.;T@o; ; [I"$Not available on all platforms.;T@o; ; [I"]If an encoding (encoding name or encoding object) is specified as an optional argument, ;TI"Bread string from pipe is tagged with the encoding specified. ;TI"DIf the argument is a colon separated two encoding names "A:B", ;TI"Fthe read string is converted from encoding A (external encoding) ;TI"<to encoding B (internal encoding), then tagged with B. ;TI"<If two optional arguments are specified, those must be ;TI")encoding objects or encoding names, ;TI"1and the first one is the external encoding, ;TI"2and the second one is the internal encoding. ;TI"FIf the external encoding and the internal encoding is specified, ;TI":optional hash argument specify the conversion option.;T@o; ; [ I"HIn the example below, the two processes close the ends of the pipe ;TI"Fthat they are not using. This is not just a cosmetic nicety. The ;TI"Fread end of a pipe will not generate an end of file condition if ;TI"Hthere are any writers with the pipe still open. In the case of the ;TI"Fparent process, the <code>rd.read</code> will never return if it ;TI"2does not first issue a <code>wr.close</code>.;T@o:RDoc::Markup::Verbatim; [I"rd, wr = IO.pipe ;TI" ;TI" if fork ;TI" wr.close ;TI"' puts "Parent got: <#{rd.read}>" ;TI" rd.close ;TI" Process.wait ;TI" else ;TI" rd.close ;TI"( puts "Sending message to parent" ;TI" wr.write "Hi Dad" ;TI" wr.close ;TI" end ;T: @format0o; ; [I"<em>produces:</em>;T@o; ; [I" Sending message to parent ;TI"Parent got: <Hi Dad>;T; 0: @fileI" io.c;T:0@omit_headings_from_table_of_contents_below0I"IO.pipe -> [read_io, write_io] IO.pipe(ext_enc) -> [read_io, write_io] IO.pipe("ext_enc:int_enc" [, opt]) -> [read_io, write_io] IO.pipe(ext_enc, int_enc [, opt]) -> [read_io, write_io] IO.pipe(...) {|read_io, write_io| ... } ;T0[ I" (p1 = v1, p2 = v2, p3 = {});T@FFI"IO;TcRDoc::NormalClass00
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