File: popen-help.pd

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pd-moonlib 0.4-1
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#N canvas 1 88 644 383 10;
#X obj 0 0 cnv 8 100 60 empty empty popen 10 20 1 18 -262144 -1109
0;
#X text 13 362 (c) Moonix: Antoine Rousseau 2003;
#X msg 31 74 open process;
#X text 12 57 open: popen for writing;
#X msg 240 76 ropen process;
#X text 221 59 ropen: popen for reading;
#X msg 466 76 close;
#X text 428 60 close (quit) current process;
#X text 108 13 processus in/out (linux only);
#X text 108 26 DANGEROUS: deadlocks are easy!!!!;
#N canvas 0 0 850 359 example 0;
#X obj 458 194 popen;
#X msg 516 167 close;
#X obj 82 311 popen;
#X msg 151 261 close;
#X msg 76 190 list cat to where you want;
#X msg 24 145 open cat > /tmp/tmp_fifo;
#X msg 431 138 ropen cat /tmp/tmp_fifo;
#X obj 38 89 system;
#X msg 38 67 mkfifo /tmp/tmp_fifo;
#X obj 76 258 symbol \;;
#X obj 76 236 t b a;
#X symbolatom 433 284 0 0 0 0 - - -;
#X text 10 17 example: fifo read/write. RESPECT THE NUMBERS for commands
!;
#X text 430 120 3: open for reading;
#X msg 92 213 list Caution not to lock your computer...;
#X text 517 183 6: close reading process;
#X obj 433 260 l2s;
#X obj 458 227 print ropen;
#X text 76 173 4: write to fifo (as many times you want);
#X text 36 46 1: create the fifo (if not done);
#X text 147 244 5: close writing process FIRST;
#X text 23 125 2: open the fifo for writing FIRST;
#X text 503 248 Caution: popen/ropen waits for a " \; ";
#X text 565 260 to send its buffer (pd style).;
#X connect 0 0 17 0;
#X connect 0 0 16 0;
#X connect 1 0 0 0;
#X connect 3 0 2 0;
#X connect 4 0 10 0;
#X connect 5 0 2 0;
#X connect 6 0 0 0;
#X connect 8 0 7 0;
#X connect 9 0 2 0;
#X connect 10 0 9 0;
#X connect 10 1 2 0;
#X connect 14 0 10 0;
#X connect 16 0 11 0;
#X restore 19 161 pd example;
#X obj 31 109 popen;
#X text 20 191 Remarks:;
#X text 46 204 The danger here comes from the fact processes lauched
by;
#X text 47 215 popen runs concurrently with pd: if they are blocking
\, pd;
#X text 46 228 is blocking too. Very dangerous if pd has real-time
priority: it blocks all the sytem. You have to switch off the computer...
;
#X text 47 267 It's much safer to use netsend/netreceive in conjonction
with pdsend/pdreceive.;
#X obj 206 333 system;
#X text 46 297 You can use "at now" to lauch programs totally independantly
from Pd:;
#X msg 206 313 echo xclock -display 0:0 | at now;
#N canvas 370 189 494 344 META 0;
#X text 12 25 LICENSE GPL v2;
#X text 12 125 AUTHOR Antoine Rousseau;
#X text 12 145 HELP_PATCH_AUTHORS Antoine Rousseau. "pd meta" information
added by Jonathan Wilkes for Pd version 0.42.;
#X text 12 45 DESCRIPTION processes in/out (linux only);
#X text 12 65 INLET_0 anything;
#X text 12 85 OUTLET_0;
#X text 12 105 OUTLET_1;
#X text 12 5 KEYWORDS control filesystem;
#X restore 587 353 pd META;
#X connect 19 0 17 0;