diff --git a/221018-pipe-example/build.ninja b/221018-pipe-example/build.ninja
index d688166ca806a7fa9246fc515d82e8f418d7599c..5f22979f3b05625ecff2ab643fae16f7ad8bd633 100644
--- a/221018-pipe-example/build.ninja
+++ b/221018-pipe-example/build.ninja
@@ -4,7 +4,7 @@ rule svg_to_pdf
 rule tex_to_pdf
     command = pdflatex -interaction=nonstopmode $in
 
-build slides.pdf slides.aux slides.log slides.nav slides.out slides.snm slides.toc: tex_to_pdf slides.tex | fig/00-parent-begin.pdf fig/01-parent-pipe.pdf fig/02-parent-fork.pdf fig/03-parent-fork-focus-pipe.pdf fig/04-parent-switch.pdf fig/05-parent-close.pdf fig/06-parent-close-done.pdf fig/07-parent-read-blocked.pdf fig/08-child-switch.pdf fig/09-child-close.pdf fig/10-child-close-done.pdf fig/11-child-dup2.pdf fig/12-child-dup2-done.pdf fig/13-child-dup2-done2.pdf fig/14-child-exec.pdf fig/15-child-exec-done.pdf fig/16-parent-read-loop.pdf fig/17-child-exit.pdf fig/18-child-exit-done.pdf fig/19-parent-close.pdf fig/20-parent-close-done.pdf
+build slides.pdf slides.aux slides.log slides.nav slides.out slides.snm slides.toc: tex_to_pdf slides.tex | fig/00-parent-begin.pdf fig/01-parent-pipe.pdf fig/02-parent-fork.pdf fig/03-parent-fork-focus-pipe.pdf fig/04-parent-switch.pdf fig/05-parent-close.pdf fig/06-parent-close-done.pdf fig/07-parent-read-blocked.pdf fig/08-child-switch.pdf fig/09-child-close.pdf fig/10-child-close-done.pdf fig/11-child-dup2.pdf fig/12-child-dup2-done.pdf fig/13-child-dup2-done2.pdf fig/14-child-exec.pdf fig/15-child-exec-done.pdf fig/16-parent-read-loop.pdf fig/17-child-exit.pdf fig/18-child-exit-done.pdf fig/18b-child-exit-done-deadlock-note.pdf fig/19-parent-close.pdf fig/20-parent-close-done.pdf
 
 build fig/00-parent-begin.pdf: svg_to_pdf fig/00-parent-begin.svg
 build fig/01-parent-pipe.pdf: svg_to_pdf fig/01-parent-pipe.svg
@@ -25,6 +25,6 @@ build fig/15-child-exec-done.pdf: svg_to_pdf fig/15-child-exec-done.svg
 build fig/16-parent-read-loop.pdf: svg_to_pdf fig/16-parent-read-loop.svg
 build fig/17-child-exit.pdf: svg_to_pdf fig/17-child-exit.svg
 build fig/18-child-exit-done.pdf: svg_to_pdf fig/18-child-exit-done.svg
+build fig/18b-child-exit-done-deadlock-note.pdf: svg_to_pdf fig/18b-child-exit-done-deadlock-note.svg
 build fig/19-parent-close.pdf: svg_to_pdf fig/19-parent-close.svg
 build fig/20-parent-close-done.pdf: svg_to_pdf fig/20-parent-close-done.svg
-
diff --git a/221018-pipe-example/fig/00-parent-begin.svg b/221018-pipe-example/fig/00-parent-begin.svg
index dbc7676399b37e77bcb9ef1502cc9a48a6c9bade..822700f78aa97384dad43120359210f63aa86bc2 100644
--- a/221018-pipe-example/fig/00-parent-begin.svg
+++ b/221018-pipe-example/fig/00-parent-begin.svg
@@ -25,12 +25,12 @@
      inkscape:deskcolor="#d1d1d1"
      inkscape:document-units="mm"
      showgrid="false"
-     inkscape:zoom="0.96143793"
-     inkscape:cx="362.4779"
-     inkscape:cy="331.27464"
+     inkscape:zoom="1.2526438"
+     inkscape:cx="463.41986"
+     inkscape:cy="259.0521"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="1920"
+     inkscape:window-x="0"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4231,18 +4231,11 @@
          id="tspan11967"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';text-align:start;text-anchor:start;stroke-width:0.264583"
          x="136.24358"
-         y="7.129312">les fds pointent au <tspan
-   style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';text-align:start;text-anchor:start"
-   id="tspan11971">bon endroit dès le</tspan></tspan><tspan
+         y="7.129312">les fds pointent au bon endroit dès le</tspan><tspan
          sodipodi:role="line"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';text-align:start;text-anchor:start;stroke-width:0.264583"
          x="136.24358"
          y="13.302937"
-         id="tspan11973">lancement du processus</tspan><tspan
-         sodipodi:role="line"
-         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';text-align:start;text-anchor:start;stroke-width:0.264583"
-         x="136.24358"
-         y="19.476562"
-         id="tspan11975">(c'est fait par le shell avant exec)</tspan></text>
+         id="tspan11975">lancement du processus</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/07-parent-read-blocked.svg b/221018-pipe-example/fig/07-parent-read-blocked.svg
index 1ffb1bf3f3c3f8c46ff33e07003a9c73c5e94933..cf55a6774520d5c8f32d1585bed51e3c556d74e2 100644
--- a/221018-pipe-example/fig/07-parent-read-blocked.svg
+++ b/221018-pipe-example/fig/07-parent-read-blocked.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.6478153"
-     inkscape:cx="518.56539"
-     inkscape:cy="349.2503"
+     inkscape:cx="511.28303"
+     inkscape:cy="140.48905"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="1920"
+     inkscape:window-x="0"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4202,11 +4202,11 @@
          id="tspan136866"
          style="stroke-width:0.264583"
          x="129.45743"
-         y="11.614304">le tube est vide.</tspan><tspan
+         y="11.614304">tentative de lecture, mais le tube est vide.</tspan><tspan
          sodipodi:role="line"
          style="stroke-width:0.264583"
          x="129.45743"
          y="17.78793"
-         id="tspan144095">read bloque donc le père</tspan></text>
+         id="tspan144095">le processus est donc bloqué.</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/14-child-exec.svg b/221018-pipe-example/fig/14-child-exec.svg
index 311232471ebb6a8ea12ca07cb9ed20a34baa8987..9650c758d58d7eed52e79f882a66fd4148951d91 100644
--- a/221018-pipe-example/fig/14-child-exec.svg
+++ b/221018-pipe-example/fig/14-child-exec.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="0.9968396"
-     inkscape:cx="275.37028"
-     inkscape:cy="499.07728"
+     inkscape:cx="276.37345"
+     inkscape:cy="500.08045"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="1920"
+     inkscape:window-x="0"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4174,12 +4174,12 @@
        xml:space="preserve"
        style="font-style:normal;font-weight:normal;font-size:4.93889px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583"
        x="130.58521"
-       y="178.95015"
+       y="172.95015"
        id="text145051"><tspan
          sodipodi:role="line"
          id="tspan145049"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.93889px;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#000000;stroke-width:0.264583"
          x="130.58521"
-         y="178.95015">la table des fds est conservée par exec !</tspan></text>
+         y="172.95015">la table des fds est conservée par exec !</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/15-child-exec-done.svg b/221018-pipe-example/fig/15-child-exec-done.svg
index 919444784080fe31cf15e2c965882077b37d90fe..c9a22df34cc4a435e1128eae81d596e3a7862da3 100644
--- a/221018-pipe-example/fig/15-child-exec-done.svg
+++ b/221018-pipe-example/fig/15-child-exec-done.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.0072646"
-     inkscape:cx="395.62594"
-     inkscape:cy="507.81096"
+     inkscape:cx="545.53689"
+     inkscape:cy="456.18599"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="1920"
+     inkscape:window-x="0"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2220,7 +2220,7 @@
        d="m 166.87657,142.08 h 31.08361 v -33.16707 h 6.43865"
        id="path80935" />
     <path
-       style="fill:none;stroke:#000000;stroke-width:0.25;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
+       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
        d="m 161.99024,152.34976 h 25.54065 v -6.69074 h 15.01428"
        id="path80939" />
     <rect
@@ -2330,12 +2330,22 @@
        xml:space="preserve"
        style="font-style:normal;font-weight:normal;font-size:4.93889px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583"
        x="130.58521"
-       y="178.95015"
+       y="172.95015"
        id="text145051"><tspan
          sodipodi:role="line"
          id="tspan145049"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.93889px;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#000000;stroke-width:0.264583"
          x="130.58521"
-         y="178.95015">la table des fds est conservée par exec !</tspan></text>
+         y="172.95015">la table des fds est conservée par exec !</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.93889px;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ff0000;stroke-width:0.264583"
+         x="130.58521"
+         y="179.12376"
+         id="tspan11374">fermer le fd 4 aurait d'ailleurs été mieux</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.93889px;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ff0000;stroke-width:0.264583"
+         x="130.58521"
+         y="185.29738"
+         id="tspan14177">avant d'exec, afin de le libérer</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/16-parent-read-loop.svg b/221018-pipe-example/fig/16-parent-read-loop.svg
index 64b2213c09dca50b8688ec9123a43fa7c2c02e46..c0c3eb5d5426f6faae12ca3ae756262efff75765 100644
--- a/221018-pipe-example/fig/16-parent-read-loop.svg
+++ b/221018-pipe-example/fig/16-parent-read-loop.svg
@@ -25,12 +25,12 @@
      inkscape:deskcolor="#d1d1d1"
      inkscape:document-units="mm"
      showgrid="false"
-     inkscape:zoom="1.1350534"
-     inkscape:cx="381.92036"
-     inkscape:cy="324.65433"
+     inkscape:zoom="1.4360808"
+     inkscape:cx="504.49808"
+     inkscape:cy="349.91068"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="1920"
+     inkscape:window-x="0"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -171,13 +171,13 @@
        transform="translate(137.74393,53.769179)">
       <text
          xml:space="preserve"
-         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;text-align:center;text-anchor:middle;stroke-width:0.264583"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:'monospace Bold';text-align:center;text-anchor:middle;stroke-width:0.264583;fill:#ff0000;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
          x="79.995087"
          y="30.468422"
          id="text26903"><tspan
            sodipodi:role="line"
            id="tspan26901"
-           style="text-align:center;text-anchor:middle;stroke-width:0.264583"
+           style="text-align:center;text-anchor:middle;stroke-width:0.264583;fill:#ff0000;-inkscape-font-specification:'monospace Bold';font-family:monospace;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
            x="79.995087"
            y="30.468422">output-file.txt</tspan></text>
       <path
@@ -2112,7 +2112,7 @@
        id="path52862"
        sodipodi:nodetypes="cccc" />
     <path
-       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
+       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#marker11169)"
        d="m 164.95174,41.699899 h 22.9205 v 27.123834 h 20.11199"
        id="path52911" />
     <path
@@ -2120,8 +2120,8 @@
        d="m 164.76942,37.039298 h 38.48161"
        id="path52913" />
     <path
-       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
-       d="m 161.02013,52.048272 h 21.77513 v 75.725918 h 58.15801 v 12.77337 H 230.4018"
+       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1;marker-start:url(#marker11169)"
+       d="M 168.38883,52.048272 H 184.141 v 75.725918 h 58.15801 v 12.77337 h -10.55147"
        id="path70938"
        sodipodi:nodetypes="cccccc" />
     <text
@@ -2217,7 +2217,7 @@
        d="m 165.47167,131.42037 h 27.57058 V 42.641205 h 10.0746"
        id="path80931" />
     <path
-       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1;marker-end:url(#marker11169)"
        d="m 166.71704,136.72533 h 28.71969 v 6.91204 l 6.95214,0"
        id="path80933"
        sodipodi:nodetypes="cccc" />
@@ -2346,18 +2346,51 @@
     <text
        xml:space="preserve"
        style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.9389px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
-       x="134.81325"
-       y="11.451879"
+       x="123.53039"
+       y="5.9572926"
        id="text166698"><tspan
          sodipodi:role="line"
-         id="tspan166696"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
-         x="134.81325"
-         y="11.451879">tout le contenu du pipe est affiché</tspan><tspan
+         x="123.53039"
+         y="5.9572926"
+         id="tspan153681">tout le contenu du pipe est transféré,</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+         x="123.53039"
+         y="12.130917"
+         id="tspan25008">caractère par caractère, depuis le pipe (fd=3)</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+         x="123.53039"
+         y="18.304543"
+         id="tspan25010">vers la sortie standard (fd=1).</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+         x="123.53039"
+         y="24.478167"
+         id="tspan88406">ici, dans le fichier <tspan
+   style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:monospace;-inkscape-font-specification:'monospace Bold'"
+   id="tspan26130">output-file.txt</tspan></tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+         x="123.53039"
+         y="30.651793"
+         id="tspan25006" /></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.9389px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+       x="123.53039"
+       y="173.76324"
+       id="text166698-6"><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+         x="123.53039"
+         y="173.76324"
+         id="tspan25006-1">les écritures sont réalisées sur la sortie</tspan><tspan
          sodipodi:role="line"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
-         x="134.81325"
-         y="17.625504"
-         id="tspan153681">(caractère par caractère)</tspan></text>
+         x="123.53039"
+         y="179.93687"
+         id="tspan80530">standard (fd=1). ici, dans le pipe</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/18-child-exit-done.svg b/221018-pipe-example/fig/18-child-exit-done.svg
index f3ff75d454f752b010c1c05ca1e527f0c0da4a95..95e528446504dc8f1c5034b80e25aca2c0212d48 100644
--- a/221018-pipe-example/fig/18-child-exit-done.svg
+++ b/221018-pipe-example/fig/18-child-exit-done.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.0261534"
-     inkscape:cx="384.44544"
-     inkscape:cy="373.7258"
+     inkscape:cx="385.41996"
+     inkscape:cy="374.70031"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="1920"
+     inkscape:window-x="0"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2265,18 +2265,23 @@
     <text
        xml:space="preserve"
        style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.9389px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#000000;stroke-width:0.264583"
-       x="125.92122"
-       y="168.80058"
+       x="123.32431"
+       y="8.7281952"
        id="text172306"><tspan
          sodipodi:role="line"
          id="tspan172304"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#000000;stroke-width:0.264583"
-         x="125.92122"
-         y="168.80058">il n'y a plus aucune référence vers l'écriture</tspan><tspan
+         x="123.32431"
+         y="8.7281952">il n'y a plus aucune référence vers l'écriture</tspan><tspan
          sodipodi:role="line"
          style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#000000;stroke-width:0.264583"
-         x="125.92122"
-         y="174.97421"
-         id="tspan117161">dans le pipe. donc read renvoie 0 (EOF)</tspan></text>
+         x="123.32431"
+         y="14.90182"
+         id="tspan45158">dans le pipe. read renverra 0 (EOF) dès que</tspan><tspan
+         sodipodi:role="line"
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+           xml:space="preserve"
+           transform="translate(71.571289,13)"
+           style="font-variant:normal;font-weight:normal;font-size:14px;font-family:'DejaVu Sans Mono';-inkscape-font-specification:DejaVuSansMono;writing-mode:lr-tb;fill:#0997b3;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           id="text3348"><tspan
+             x="0"
+             y="0"
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+        <text
+           xml:space="preserve"
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+           style="font-variant:normal;font-weight:normal;font-size:14px;font-family:'DejaVu Sans Mono';-inkscape-font-specification:DejaVuSansMono;writing-mode:lr-tb;fill:#383a42;fill-opacity:1;fill-rule:nonzero;stroke:none"
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+       transform="translate(107.58483,23.626053)"
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+           sodipodi:role="line"
+           id="tspan54906"
+           style="stroke-width:0.264583;fill:#000000"
+           x="94.883553"
+           y="133.28987">pipe:[1137]</tspan></text>
+    </g>
+    <path
+       style="fill:none;stroke:#cccccc;stroke-width:0.25;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
+       d="m 164.87473,47.220362 h 20.20444 v 60.072908 l 19.85168,0"
+       id="path52862"
+       sodipodi:nodetypes="cccc" />
+    <path
+       style="fill:none;stroke:#e5e5e5;stroke-width:0.25;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
+       d="m 164.95174,41.699899 h 22.9205 v 27.123834 h 20.11199"
+       id="path52911" />
+    <path
+       style="fill:none;stroke:#cccccc;stroke-width:0.25;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
+       d="m 164.76942,37.039298 h 38.48161"
+       id="path52913" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:0.25;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
+       d="m 161.02013,52.048272 h 21.77513 v 75.725918 h 58.15801 v 12.77337 H 230.4018"
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+       sodipodi:nodetypes="cccccc" />
+    <rect
+       style="fill:none;stroke:#000000;stroke-width:0.168479;stroke-dasharray:none;stroke-opacity:1"
+       id="rect9440-6"
+       width="116.25708"
+       height="89.83152"
+       x="6.2269368"
+       y="97.798691" />
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-weight:normal;font-size:4.93888889px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583"
+       x="10.59283"
+       y="115.12449"
+       id="text149371"><tspan
+         sodipodi:role="line"
+         id="tspan149369"
+         style="stroke-width:0.264583;font-size:4.93888889px"
+         x="10.59283"
+         y="115.12449" /></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-weight:normal;font-size:4.93889px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583"
+       x="17.387365"
+       y="139.6445"
+       id="text149375"><tspan
+         sodipodi:role="line"
+         id="tspan149373"
+         style="font-size:4.93889px;stroke-width:0.264583"
+         x="17.387365"
+         y="139.6445">echo est chargé en mémoire et exécuté</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:4.9389px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583"
+       x="17.387365"
+       y="146.40823"
+       id="text166694"><tspan
+         sodipodi:role="line"
+         id="tspan166692"
+         style="stroke-width:0.264583"
+         x="17.387365"
+         y="146.40823">echo affiche tout son texte</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-size:4.9389px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583"
+       x="17.387365"
+       y="153.69962"
+       id="text169324"><tspan
+         sodipodi:role="line"
+         id="tspan169322"
+         style="stroke-width:0.264583"
+         x="17.387365"
+         y="153.69962">echo termine</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.9389px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ff0000;stroke-width:0.264583"
+       x="128.64386"
+       y="8.7281952"
+       id="text172306"><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ff0000;stroke-width:0.264583"
+         x="128.64386"
+         y="8.7281952"
+         id="tspan45162">si p[1] était encore ouvert, read bloquerait</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ff0000;stroke-width:0.264583"
+         x="128.64386"
+         y="14.90182"
+         id="tspan56573">le processus indéfiniment !</tspan></text>
+    <path
+       style="fill:none;stroke:#ff0000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:3;stroke-opacity:1;stroke-dashoffset:0"
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+       id="g71350">
+      <text
+         xml:space="preserve"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;text-align:center;text-anchor:middle;stroke-width:0.264583"
+         x="151.51085"
+         y="69.661545"
+         id="text6972"><tspan
+           sodipodi:role="line"
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+           style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:sans-serif;text-align:center;text-anchor:middle;stroke-width:0.264583"
+           x="151.51085"
+           y="69.661545">processus père</tspan></text>
+      <rect
+         style="fill:#f2f2f2;stroke:#000000;stroke-width:0.1;stroke-dasharray:none;stroke-opacity:1"
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+         height="37.809834"
+         x="136.70837"
+         y="25.866203" />
+      <path
+         style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+         d="m 139.02258,33.329593 h 25"
+         id="path169" />
+      <path
+         style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+         d="M 145.22491,61.117913 V 27.471865"
+         id="path169-3" />
+      <text
+         xml:space="preserve"
+         style="font-style:normal;font-weight:normal;font-size:4.23333px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583"
+         x="138.92543"
+         y="31.60957"
+         id="text225"><tspan
+           sodipodi:role="line"
+           id="tspan223"
+           style="font-size:4.23333px;stroke-width:0.264583"
+           x="138.92543"
+           y="31.60957">fd   variable</tspan></text>
+      <text
+         xml:space="preserve"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;stroke-width:0.264583"
+         x="140.22003"
+         y="38.094936"
+         id="text4716"><tspan
+           sodipodi:role="line"
+           id="tspan4714"
+           style="stroke-width:0.264583"
+           x="140.22003"
+           y="38.094936">0  stdin</tspan></text>
+      <text
+         xml:space="preserve"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;stroke-width:0.264583;fill:#000000"
+         x="139.98645"
+         y="43.379482"
+         id="text4720"><tspan
+           sodipodi:role="line"
+           id="tspan4718"
+           style="stroke-width:0.264583;fill:#000000"
+           x="139.98645"
+           y="43.379482">1  stdout</tspan></text>
+      <text
+         xml:space="preserve"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;stroke-width:0.264583"
+         x="140.18077"
+         y="48.664028"
+         id="text4724"><tspan
+           sodipodi:role="line"
+           id="tspan4722"
+           style="stroke-width:0.264583"
+           x="140.18077"
+           y="48.664028">2  stderr</tspan></text>
+      <text
+         xml:space="preserve"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;stroke-width:0.264583;fill:#000000"
+         x="140.21178"
+         y="53.450417"
+         id="text4728"><tspan
+           sodipodi:role="line"
+           id="tspan4726"
+           style="stroke-width:0.264583;fill:#000000"
+           x="140.21178"
+           y="53.450417">3  p[0]</tspan></text>
+    </g>
+  </g>
+</svg>
diff --git a/221018-pipe-example/fig/20-parent-close-done.svg b/221018-pipe-example/fig/20-parent-close-done.svg
index 2117ffd6c4e30abf2d4dd9c04b34529f9f66a0e2..08f6e60be0f4a72d454ffd938c320ad30bafa65f 100644
--- a/221018-pipe-example/fig/20-parent-close-done.svg
+++ b/221018-pipe-example/fig/20-parent-close-done.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.0261534"
-     inkscape:cx="477.0242"
-     inkscape:cy="355.21005"
+     inkscape:cx="468.25358"
+     inkscape:cy="368.85323"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="1920"
+     inkscape:window-x="0"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2090,13 +2090,13 @@
          y="111.85227" />
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-         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;stroke-width:0.264583;fill:#000000"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:'monospace Bold';stroke-width:0.264583;fill:#ff0000;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
          x="94.883553"
          y="133.28987"
          id="text54908"><tspan
            sodipodi:role="line"
            id="tspan54906"
-           style="stroke-width:0.264583;fill:#000000"
+           style="stroke-width:0.264583;fill:#ff0000;-inkscape-font-specification:'monospace Bold';font-family:monospace;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
            x="94.883553"
            y="133.28987">pipe:[1137]</tspan></text>
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diff --git a/221018-pipe-example/slides.tex b/221018-pipe-example/slides.tex
index 3fbfe2631b9ad643da9015a151167fcc8209ee5f..f24c500d9b38330766d2abae63d5c684cc1b019e 100644
--- a/221018-pipe-example/slides.tex
+++ b/221018-pipe-example/slides.tex
@@ -34,6 +34,7 @@
 \imageframe{fig/16-parent-read-loop.pdf}
 \imageframe{fig/17-child-exit.pdf}
 \imageframe{fig/18-child-exit-done.pdf}
+\imageframe{fig/18b-child-exit-done-deadlock-note.pdf}
 \imageframe{fig/19-parent-close.pdf}
 \imageframe{fig/20-parent-close-done.pdf}