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124 | .\" ======================================================================== |
125 | .\" |
126 | .IX Title "IPC::Run::IO 3" |
127 | .TH IPC::Run::IO 3 "2009-07-13" "perl v5.8.7" "User Contributed Perl Documentation" |
128 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
129 | .\" way too many mistakes in technical documents. |
130 | .if n .ad l |
131 | .nh |
132 | .SH "NAME" |
133 | IPC::Run::IO \-\- I/O channels for IPC::Run. |
134 | .SH "SYNOPSIS" |
135 | .IX Header "SYNOPSIS" |
136 | \&\fB\s-1NOT\s0 \s-1IMPLEMENTED\s0 \s-1YET\s0 \s-1ON\s0 Win32! Win32 does not allow \f(BIselect()\fB on |
137 | normal file descriptors; \s-1IPC::RUN::IO\s0 needs to use IPC::Run::Win32Helper |
138 | to do this.\fR |
139 | .PP |
140 | .Vb 1 |
141 | \& use IPC::Run qw( io ); |
142 | \& |
143 | \& ## The sense of \*(Aq>\*(Aq and \*(Aq<\*(Aq is opposite of perl\*(Aqs open(), |
144 | \& ## but agrees with IPC::Run. |
145 | \& $io = io( "filename", \*(Aq>\*(Aq, \e$recv ); |
146 | \& $io = io( "filename", \*(Aqr\*(Aq, \e$recv ); |
147 | \& |
148 | \& ## Append to $recv: |
149 | \& $io = io( "filename", \*(Aq>>\*(Aq, \e$recv ); |
150 | \& $io = io( "filename", \*(Aqra\*(Aq, \e$recv ); |
151 | \& |
152 | \& $io = io( "filename", \*(Aq<\*(Aq, \e$send ); |
153 | \& $io = io( "filename", \*(Aqw\*(Aq, \e$send ); |
154 | \& |
155 | \& $io = io( "filename", \*(Aq<<\*(Aq, \e$send ); |
156 | \& $io = io( "filename", \*(Aqwa\*(Aq, \e$send ); |
157 | \& |
158 | \& ## Handles / IO objects that the caller opens: |
159 | \& $io = io( \e*HANDLE, \*(Aq<\*(Aq, \e$send ); |
160 | \& |
161 | \& $f = IO::Handle\->new( ... ); # Any subclass of IO::Handle |
162 | \& $io = io( $f, \*(Aq<\*(Aq, \e$send ); |
163 | \& |
164 | \& require IPC::Run::IO; |
165 | \& $io = IPC::Run::IO\->new( ... ); |
166 | \& |
167 | \& ## Then run(), harness(), or start(): |
168 | \& run $io, ...; |
169 | \& |
170 | \& ## You can, of course, use io() or IPC::Run::IO\->new() as an |
171 | \& ## argument to run(), harness, or start(): |
172 | \& run io( ... ); |
173 | .Ve |
174 | .SH "DESCRIPTION" |
175 | .IX Header "DESCRIPTION" |
176 | This class and module allows filehandles and filenames to be harnessed for |
177 | I/O when used IPC::Run, independant of anything else IPC::Run is doing |
178 | (except that errors & exceptions can affect all things that IPC::Run is |
179 | doing). |
180 | .SH "SUBCLASSING" |
181 | .IX Header "SUBCLASSING" |
182 | \&\s-1INCOMPATIBLE\s0 \s-1CHANGE:\s0 due to the awkwardness introduced in ripping pseudohashes |
183 | out of Perl, this class \fIno longer\fR uses the fields pragma. |
184 | .SH "TODO" |
185 | .IX Header "TODO" |
186 | Implement bidirectionality. |
187 | .SH "AUTHOR" |
188 | .IX Header "AUTHOR" |
189 | Barrie Slaymaker <barries@slaysys.com> |
190 | .IP "filename" 4 |
191 | .IX Item "filename" |
192 | Gets/sets the filename. Returns the value after the name change, if |
193 | any. |
194 | .IP "init" 4 |
195 | .IX Item "init" |
196 | Does initialization required before this can be run. This includes \fIopen()\fRing |
197 | the file, if necessary, and clearing the destination scalar if necessary. |
198 | .IP "open" 4 |
199 | .IX Item "open" |
200 | If a filename was passed in, opens it. Determines if the handle is open |
201 | via \fIfileno()\fR. Throws an exception on error. |
202 | .IP "open_pipe" 4 |
203 | .IX Item "open_pipe" |
204 | If this is a redirection \s-1IO\s0 object, this opens the pipe in a platform |
205 | independant manner. |
206 | .IP "close" 4 |
207 | .IX Item "close" |
208 | Closes the handle. Throws an exception on failure. |
209 | .IP "fileno" 4 |
210 | .IX Item "fileno" |
211 | Returns the fileno of the handle. Throws an exception on failure. |
212 | .IP "mode" 4 |
213 | .IX Item "mode" |
214 | Returns the operator in terms of 'r', 'w', and 'a'. There is a state |
215 | \&'ra', unlike Perl's \fIopen()\fR, which indicates that data read from the |
216 | handle or file will be appended to the output if the output is a scalar. |
217 | This is only meaningful if the output is a scalar, it has no effect if |
218 | the output is a subroutine. |
219 | .Sp |
220 | The redirection operators can be a little confusing, so here's a reference |
221 | table: |
222 | .Sp |
223 | .Vb 6 |
224 | \& > r Read from handle in to process |
225 | \& < w Write from process out to handle |
226 | \& >> ra Read from handle in to process, appending it to existing |
227 | \& data if the destination is a scalar. |
228 | \& << wa Write from process out to handle, appending to existing |
229 | \& data if IPC::Run::IO opened a named file. |
230 | .Ve |
231 | .IP "op" 4 |
232 | .IX Item "op" |
233 | Returns the operation: '<', '>', '<<', '>>'. See \*(L"mode\*(R" if you want |
234 | to spell these 'r', 'w', etc. |
235 | .IP "binmode" 4 |
236 | .IX Item "binmode" |
237 | Sets/gets whether this pipe is in binmode or not. No effect off of Win32 |
238 | OSs, of course, and on Win32, no effect after the harness is \fIstart()\fRed. |
239 | .IP "dir" 4 |
240 | .IX Item "dir" |
241 | Returns the first character of \f(CW$self\fR\->op. This is either \*(L"<\*(R" or \*(L">\*(R". |