diff --git a/221018-pipe-example/fig/00-parent-begin.svg b/221018-pipe-example/fig/00-parent-begin.svg
index ede2f2919e452127ec9cadd5bfb1baadf2990f68..dbc7676399b37e77bcb9ef1502cc9a48a6c9bade 100644
--- a/221018-pipe-example/fig/00-parent-begin.svg
+++ b/221018-pipe-example/fig/00-parent-begin.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="0.96143793"
-     inkscape:cx="264.18762"
-     inkscape:cy="311.51257"
+     inkscape:cx="362.4779"
+     inkscape:cy="331.27464"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -80,6 +80,39 @@
      inkscape:label="Layer 1"
      inkscape:groupmode="layer"
      id="layer1">
+    <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="142.3044"
+       y="147.98572"
+       id="text4728-5"><tspan
+         sodipodi:role="line"
+         id="tspan4726-7"
+         style="stroke-width:0.264583"
+         x="142.3044"
+         y="147.98572">3  p[0]</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="142.37674"
+       y="153.27026"
+       id="text4732-0"><tspan
+         sodipodi:role="line"
+         id="tspan4730-8"
+         style="stroke-width:0.264583"
+         x="142.37674"
+         y="153.27026">4  p[1]</tspan></text>
+    <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="153.60347"
+       y="164.19684"
+       id="text6972-1"><tspan
+         sodipodi:role="line"
+         id="tspan6970-9"
+         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="153.60347"
+         y="164.19684">processus fils</tspan></text>
     <rect
        style="fill:#f2f2f2;stroke:#000000;stroke-width:0.1;stroke-dasharray:none;stroke-opacity:1"
        id="rect6964-9"
@@ -139,39 +172,6 @@
          style="stroke-width:0.264583"
          x="142.27339"
          y="143.19933">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"
-       x="142.3044"
-       y="147.98572"
-       id="text4728-5"><tspan
-         sodipodi:role="line"
-         id="tspan4726-7"
-         style="stroke-width:0.264583"
-         x="142.3044"
-         y="147.98572">3  p[0]</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="142.37674"
-       y="153.27026"
-       id="text4732-0"><tspan
-         sodipodi:role="line"
-         id="tspan4730-8"
-         style="stroke-width:0.264583"
-         x="142.37674"
-         y="153.27026">4  p[1]</tspan></text>
-    <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="153.60347"
-       y="164.19684"
-       id="text6972-1"><tspan
-         sodipodi:role="line"
-         id="tspan6970-9"
-         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="153.60347"
-         y="164.19684">processus fils</tspan></text>
     <g
        id="g11249-2"
        transform="translate(0,129.80128)">
@@ -4171,5 +4171,78 @@
            x="151.51085"
            y="69.661545">processus père</tspan></text>
     </g>
+    <text
+       xml:space="preserve"
+       style="font-size:4.9389px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583"
+       x="105.99345"
+       y="155.90544"
+       id="text2671"><tspan
+         sodipodi:role="line"
+         id="tspan2669"
+         style="stroke-width:0.264583"
+         x="105.99345"
+         y="155.90544" /></text>
+    <g
+       id="g10195"
+       transform="translate(0,-13.503523)">
+      <g
+         id="g10182"
+         transform="translate(-11.964325,12.708641)">
+        <rect
+           style="fill:#282c34;fill-opacity:1;stroke:none;stroke-width:0.499999;stroke-opacity:1"
+           id="rect2787"
+           width="148.82661"
+           height="11.942157"
+           x="65.123428"
+           y="153.14241" />
+        <text
+           xml:space="preserve"
+           style="font-size:4.9389px;line-height:1.25;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono';text-align:center;text-anchor:middle;fill:#dcdfe4;fill-opacity:1;stroke-width:0.264583"
+           x="139.67058"
+           y="160.48929"
+           id="text2733"><tspan
+             sodipodi:role="line"
+             id="tspan2731"
+             style="text-align:center;text-anchor:middle;fill:#dcdfe4;fill-opacity:1;stroke-width:0.264583"
+             x="139.67058"
+             y="160.48929"><tspan
+   style="text-align:center;text-anchor:middle;fill:#61afef;fill-opacity:1"
+   id="tspan10176">~</tspan> $ ./pipe-example 1&gt;output-file.txt 2&gt;/dev/null</tspan></text>
+      </g>
+      <text
+         xml:space="preserve"
+         style="font-size:4.9389px;line-height:1.25;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono';text-align:center;text-anchor:middle;stroke-width:0.264583"
+         x="127.56879"
+         y="185.86705"
+         id="text10186"><tspan
+           sodipodi:role="line"
+           id="tspan10184"
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:serif;-inkscape-font-specification:'serif Bold';text-align:center;text-anchor:middle;stroke-width:0.264583"
+           x="127.56879"
+           y="185.86705">Processus lancé par cette commande</tspan></text>
+    </g>
+    <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';text-align:start;text-anchor:start;stroke-width:0.264583"
+       x="136.24358"
+       y="7.129312"
+       id="text11969"><tspan
+         sodipodi:role="line"
+         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
+         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>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/01-parent-pipe.svg b/221018-pipe-example/fig/01-parent-pipe.svg
index 91e448554ee5cf3f914e3cd5544c84393e4aee6b..4d4f180894a3f322548c6ac26cbd5f3017a5bf92 100644
--- a/221018-pipe-example/fig/01-parent-pipe.svg
+++ b/221018-pipe-example/fig/01-parent-pipe.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.0379863"
-     inkscape:cx="290.46625"
-     inkscape:cy="437.86703"
+     inkscape:cx="472.54959"
+     inkscape:cy="345.38028"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4077,12 +4077,12 @@
        d="m 164.76942,37.039298 h 38.48161"
        id="path52913" />
     <path
-       style="fill:none;stroke:#000000;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       style="fill:none;stroke:#000000;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"
        id="path70938"
        sodipodi:nodetypes="cccccc" />
     <path
-       style="fill:none;stroke:#000000;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-dasharray:none"
        d="m 161.44386,57.554015 h 19.04361 v 83.069205 h 22.05073"
        id="path70940" />
     <g
@@ -4165,7 +4165,7 @@
          id="text4732"><tspan
            sodipodi:role="line"
            id="tspan4730"
-           style="stroke-width:0.264583"
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:monospace;-inkscape-font-specification:'monospace Bold';stroke-width:0.264583"
            x="140.28412"
            y="58.734962">4  p[1]</tspan></text>
       <text
@@ -4176,9 +4176,31 @@
          id="text4728"><tspan
            sodipodi:role="line"
            id="tspan4726"
-           style="stroke-width:0.264583"
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:monospace;-inkscape-font-specification:'monospace Bold';stroke-width:0.264583"
            x="140.21178"
            y="53.450417">3  p[0]</tspan></text>
     </g>
+    <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';text-align:center;text-anchor:middle;stroke-width:0.264583"
+       x="216.21722"
+       y="164.30287"
+       id="text19214"><tspan
+         sodipodi:role="line"
+         id="tspan19212"
+         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:center;text-anchor:middle;stroke-width:0.264583"
+         x="216.21722"
+         y="164.30287">création du pipe</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';text-align:start;text-anchor:start;stroke-width:0.264583"
+       x="129.30327"
+       y="14.713733"
+       id="text19214-3"><tspan
+         sodipodi:role="line"
+         id="tspan19212-6"
+         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="129.30327"
+         y="14.713733">ajout de 2 nouveaux fds pour ce processus</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/02-parent-fork.svg b/221018-pipe-example/fig/02-parent-fork.svg
index 54d0adc9a8c2954efeb079e8cf770dca0500cce6..a6f8013d875e4854f8e6288962a3f2438b41f19e 100644
--- a/221018-pipe-example/fig/02-parent-fork.svg
+++ b/221018-pipe-example/fig/02-parent-fork.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.4213661"
-     inkscape:cx="554.04444"
-     inkscape:cy="542.78766"
+     inkscape:cx="554.748"
+     inkscape:cy="543.49122"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4204,5 +4204,21 @@
            x="153.60347"
            y="164.19684">processus fils</tspan></text>
     </g>
+    <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';text-align:start;text-anchor:start;stroke-width:0.264583"
+       x="125.96134"
+       y="180.5135"
+       id="text19214-3"><tspan
+         sodipodi:role="line"
+         id="tspan19212-6"
+         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="125.96134"
+         y="180.5135">le nouveau processus hérite des fds ouverts</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="125.96134"
+         y="186.68713"
+         id="tspan28384">(mais sa table des fds n'est pas celle du père)</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/05-parent-close.svg b/221018-pipe-example/fig/05-parent-close.svg
index 36e70f11d65e24b5443f489efdcc3780479b6e59..1f21cfec6a3ecd137841c6fc980797d6f33f7ca5 100644
--- a/221018-pipe-example/fig/05-parent-close.svg
+++ b/221018-pipe-example/fig/05-parent-close.svg
@@ -25,12 +25,12 @@
      inkscape:deskcolor="#d1d1d1"
      inkscape:document-units="mm"
      showgrid="false"
-     inkscape:zoom="1.311741"
-     inkscape:cx="492.85646"
-     inkscape:cy="328.95214"
+     inkscape:zoom="0.92754096"
+     inkscape:cx="404.83388"
+     inkscape:cy="375.72465"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2120,7 +2120,7 @@
        id="path70938"
        sodipodi:nodetypes="cccccc" />
     <path
-       style="fill:none;stroke:#ff0000;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 161.44386,57.554015 h 19.04361 v 83.069205 h 22.05073"
        id="path70940" />
     <text
@@ -2195,13 +2195,13 @@
          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:#ff0000"
+       style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;fill:#ff0000;stroke-width:0.264583"
        x="140.28412"
        y="58.734962"
        id="text4732"><tspan
          sodipodi:role="line"
          id="tspan4730"
-         style="stroke-width:0.264583;fill:#ff0000"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:monospace;-inkscape-font-specification:'monospace Bold';fill:#ff0000;stroke-width:0.264583"
          x="140.28412"
          y="58.734962">4  p[1]</tspan></text>
     <text
@@ -4201,5 +4201,21 @@
            x="153.60347"
            y="164.19684">processus fils</tspan></text>
     </g>
+    <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';text-align:start;text-anchor:start;stroke-width:0.264583"
+       x="125.65289"
+       y="10.92132"
+       id="text19214-3"><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="125.65289"
+         y="10.92132"
+         id="tspan28384">fermeture de l'accès en écriture au pipe</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="125.65289"
+         y="17.094944"
+         id="tspan38011">(pour ce processus uniquement)</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/06-parent-close-done.svg b/221018-pipe-example/fig/06-parent-close-done.svg
index b8ffc23e8a09338610a51cd5135528d40d1c753c..18df8ffdb396f45cb5074a5eedc811a1f3674092 100644
--- a/221018-pipe-example/fig/06-parent-close-done.svg
+++ b/221018-pipe-example/fig/06-parent-close-done.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.311741"
-     inkscape:cx="492.85646"
-     inkscape:cy="328.95214"
+     inkscape:cx="505.81632"
+     inkscape:cy="192.49227"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4186,5 +4186,21 @@
            x="153.60347"
            y="164.19684">processus fils</tspan></text>
     </g>
+    <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';text-align:start;text-anchor:start;stroke-width:0.264583"
+       x="136.27252"
+       y="7.129312"
+       id="text19214-3"><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="136.27252"
+         y="7.129312"
+         id="tspan38011">libération du fd 4 pour ce 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="136.27252"
+         y="13.302937"
+         id="tspan48809">un futur fd pourra utiliser ce numéro</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 020eadaa9b0bdd4c70a2a96686d4ffd3e78caa34..1ffb1bf3f3c3f8c46ff33e07003a9c73c5e94933 100644
--- a/221018-pipe-example/fig/07-parent-read-blocked.svg
+++ b/221018-pipe-example/fig/07-parent-read-blocked.svg
@@ -25,12 +25,12 @@
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      inkscape:document-units="mm"
      showgrid="false"
-     inkscape:zoom="1.1651814"
-     inkscape:cx="475.89155"
-     inkscape:cy="452.71919"
+     inkscape:zoom="1.6478153"
+     inkscape:cx="518.56539"
+     inkscape:cy="349.2503"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
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      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -1448,7 +1448,8 @@
            id="text3066"><tspan
              x="0"
              y="0"
-             id="tspan3064">r</tspan></text>
+             id="tspan3064"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">r</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(111.83923,13)"
@@ -1456,7 +1457,8 @@
            id="text3070"><tspan
              x="0"
              y="0"
-             id="tspan3068">e</tspan></text>
+             id="tspan3068"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">e</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(119.78565,13)"
@@ -1464,7 +1466,8 @@
            id="text3074"><tspan
              x="0"
              y="0"
-             id="tspan3072">a</tspan></text>
+             id="tspan3072"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">a</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(127.73206,13)"
@@ -1472,7 +1475,8 @@
            id="text3078"><tspan
              x="0"
              y="0"
-             id="tspan3076">d</tspan></text>
+             id="tspan3076"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">d</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(135.67847,13)"
@@ -1480,7 +1484,8 @@
            id="text3082"><tspan
              x="0"
              y="0"
-             id="tspan3080">(</tspan></text>
+             id="tspan3080"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">(</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(143.62488,13)"
@@ -1648,7 +1653,8 @@
            id="text3166"><tspan
              x="0"
              y="0"
-             id="tspan3164">)</tspan></text>
+             id="tspan3164"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">)</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(336,13)"
@@ -2091,13 +2097,13 @@
          y="111.85227" />
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          xml:space="preserve"
-         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;stroke-width:0.264583"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:'monospace Bold';stroke-width:0.264583;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal;fill:#ff0000"
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          y="133.28987"
          id="text54908"><tspan
            sodipodi:role="line"
            id="tspan54906"
-           style="stroke-width:0.264583"
+           style="stroke-width:0.264583;-inkscape-font-specification:'monospace Bold';font-family:monospace;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal;fill:#ff0000"
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     </g>
@@ -2115,7 +2121,7 @@
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        id="path52913" />
     <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 161.02013,52.048272 h 21.77513 v 75.725918 h 58.15801 v 12.77337 H 230.4018"
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@@ -2191,13 +2197,13 @@
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        xml:space="preserve"
-       style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;stroke-width:0.264583"
+       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"
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        y="53.450417"
        id="text4728"><tspan
          sodipodi:role="line"
          id="tspan4726"
-         style="stroke-width:0.264583"
+         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"
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          y="53.450417">3  p[0]</tspan></text>
     <g
@@ -4188,25 +4194,19 @@
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     <text
        xml:space="preserve"
-       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.93889px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ff0000;fill-opacity:1;stroke:none;stroke-width:0.264583;stroke-opacity:1"
-       x="211.33159"
-       y="135.88972"
-       id="text119606"><tspan
+       style="font-weight:bold;font-size:4.9389px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+       x="129.45743"
+       y="11.614304"
+       id="text136868"><tspan
          sodipodi:role="line"
-         id="tspan119604"
-         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;fill-opacity:1;stroke:none;stroke-width:0.264583;stroke-opacity:1"
-         x="211.33159"
-         y="135.88972">vide ! </tspan></text>
-    <text
-       xml:space="preserve"
-       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:4.93889px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ff0000;fill-opacity:1;stroke:none;stroke-width:0.264583;stroke-opacity:1"
-       x="59.580173"
-       y="59.711948"
-       id="text119606-1"><tspan
+         id="tspan136866"
+         style="stroke-width:0.264583"
+         x="129.45743"
+         y="11.614304">le tube est vide.</tspan><tspan
          sodipodi:role="line"
-         id="tspan119604-9"
-         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;fill-opacity:1;stroke:none;stroke-width:0.264583;stroke-opacity:1"
-         x="59.580173"
-         y="59.711948">bloque ! </tspan></text>
+         style="stroke-width:0.264583"
+         x="129.45743"
+         y="17.78793"
+         id="tspan144095">read bloque donc le père</tspan></text>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/09-child-close.svg b/221018-pipe-example/fig/09-child-close.svg
index 14a48ca4c212787cd903c5420040f73dd9b69bfa..bc605dad14c8f1cadccc3ed420dc85c31d57f03d 100644
--- a/221018-pipe-example/fig/09-child-close.svg
+++ b/221018-pipe-example/fig/09-child-close.svg
@@ -26,11 +26,11 @@
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      showgrid="false"
      inkscape:zoom="1.1523238"
-     inkscape:cx="359.70792"
-     inkscape:cy="421.32255"
+     inkscape:cx="360.57573"
+     inkscape:cy="422.19036"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4084,7 +4084,7 @@
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     <path
-       style="fill:none;stroke:#ff0000;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 161.3556,146.79246 h 12.5336 v 24.49279 h 67.20842 v -26.99339 h -10.28438"
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     <path
@@ -4152,13 +4152,13 @@
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     <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:#ff0000"
+       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"
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        id="text4728-5"><tspan
          sodipodi:role="line"
          id="tspan4726-7"
-         style="stroke-width:0.264583;fill:#ff0000"
+         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="142.3044"
          y="147.98572">3  p[0]</tspan></text>
     <text
diff --git a/221018-pipe-example/fig/11-child-dup2.svg b/221018-pipe-example/fig/11-child-dup2.svg
index 3ceba350dbfc4d66ab4fc72188c4e279a1aff060..0ba974f79f4b544882cac723d5221891fc66e481 100644
--- a/221018-pipe-example/fig/11-child-dup2.svg
+++ b/221018-pipe-example/fig/11-child-dup2.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.4666184"
-     inkscape:cx="443.1964"
-     inkscape:cy="461.94702"
+     inkscape:cx="444.21916"
+     inkscape:cy="462.62886"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2092,13 +2092,13 @@
          y="111.85227" />
       <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:#ff0000"
+         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"
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          y="133.28987"
          id="text54908"><tspan
            sodipodi:role="line"
            id="tspan54906"
-           style="stroke-width:0.264583;fill:#ff0000"
+           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"
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     </g>
@@ -4077,7 +4077,7 @@
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        id="path80931" />
     <path
-       style="fill:none;stroke:#ff0000;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 166.71704,136.72533 h 28.71969 V 71.029771 h 12.6199"
        id="path80933" />
     <path
@@ -4127,13 +4127,13 @@
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     <text
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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:#ff0000"
+       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="142.07907"
        y="137.91478"
        id="text4720-4"><tspan
          sodipodi:role="line"
          id="tspan4718-5"
-         style="stroke-width:0.264583;fill:#ff0000"
+         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="142.07907"
          y="137.91478">1  stdout</tspan></text>
     <text
diff --git a/221018-pipe-example/fig/12-child-dup2-done.svg b/221018-pipe-example/fig/12-child-dup2-done.svg
index 56c3b451c0780a3232999d8b24a42df04b3ad078..c87208006ef2a90db2d7db6d2b1649e35af9438b 100644
--- a/221018-pipe-example/fig/12-child-dup2-done.svg
+++ b/221018-pipe-example/fig/12-child-dup2-done.svg
@@ -25,12 +25,12 @@
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      inkscape:document-units="mm"
      showgrid="false"
-     inkscape:zoom="1.4666184"
-     inkscape:cx="443.1964"
-     inkscape:cy="461.94702"
+     inkscape:zoom="1.0370558"
+     inkscape:cx="337.01175"
+     inkscape:cy="398.72492"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2092,13 +2092,13 @@
          y="111.85227" />
       <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:#ff0000"
+         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:#ff0000"
+           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>
     </g>
@@ -4077,7 +4077,7 @@
        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:0.25;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"
        d="m 166.71704,136.72533 h 28.71969 v 6.91204 l 6.95214,0"
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        sodipodi:nodetypes="cccc" />
@@ -4128,13 +4128,13 @@
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     <text
        xml:space="preserve"
-       style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;fill:#ff0000;stroke-width:0.264583"
+       style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:'monospace Bold';fill:#ff0000;stroke-width:0.264583;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
        x="142.07907"
        y="137.91478"
        id="text4720-4"><tspan
          sodipodi:role="line"
          id="tspan4718-5"
-         style="fill:#ff0000;stroke-width:0.264583"
+         style="fill:#ff0000;stroke-width:0.264583;-inkscape-font-specification:'monospace Bold';font-family:monospace;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
          x="142.07907"
          y="137.91478">1  stdout</tspan></text>
     <text
@@ -4170,5 +4170,28 @@
          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="153.60347"
          y="164.19684">processus fils</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:4.9389px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+       x="129.44049"
+       y="171.1217"
+       id="text73542"><tspan
+         sodipodi:role="line"
+         id="tspan73540"
+         style="stroke-width:0.264583"
+         x="129.44049"
+         y="171.1217">dup2 <tspan
+   style="font-style:italic;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold Italic'"
+   id="tspan73544">écrase</tspan> le fd 1, pour qu'il pointe</tspan><tspan
+         sodipodi:role="line"
+         style="stroke-width:0.264583"
+         x="129.44049"
+         y="177.29533"
+         id="tspan73546">maintenant vers l'écriture dans le pipe</tspan><tspan
+         sodipodi:role="line"
+         style="stroke-width:0.264583"
+         x="129.44049"
+         y="183.46895"
+         id="tspan84143">(1 est fermé avant d'être écrasé)</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 7f9099f549073d1bc4ba1cbc9b8f3ca7e5257d85..311232471ebb6a8ea12ca07cb9ed20a34baa8987 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="273.86552"
-     inkscape:cy="498.07411"
+     inkscape:cx="275.37028"
+     inkscape:cy="499.07728"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
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      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -4172,14 +4172,14 @@
          y="164.19684">processus fils</tspan></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:#ff0000;fill-opacity:1;stroke:none;stroke-width:0.264583"
-       x="131.37462"
-       y="176.40404"
+       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"
        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:#ff0000;stroke-width:0.264583"
-         x="131.37462"
-         y="176.40404">fd préservés par exec</tspan></text>
+         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>
   </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 d07bb0c3a0dd55d0f81aef6f780980de08b6c2b7..919444784080fe31cf15e2c965882077b37d90fe 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 @@
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      showgrid="false"
      inkscape:zoom="1.0072646"
-     inkscape:cx="394.13676"
-     inkscape:cy="506.81818"
+     inkscape:cx="395.62594"
+     inkscape:cy="507.81096"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
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      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2304,17 +2304,6 @@
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          x="153.60347"
          y="164.19684">processus fils</tspan></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:#ff0000;fill-opacity:1;stroke:none;stroke-width:0.264583"
-       x="131.37462"
-       y="176.40404"
-       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:#ff0000;stroke-width:0.264583"
-         x="131.37462"
-         y="176.40404">fd préservés par exec</tspan></text>
     <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"
@@ -2337,5 +2326,16 @@
          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-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"
+       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>
   </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 0764d2c8cfc0d7d3dd575ea3d6a222d99ca82ff9..64b2213c09dca50b8688ec9123a43fa7c2c02e46 100644
--- a/221018-pipe-example/fig/16-parent-read-loop.svg
+++ b/221018-pipe-example/fig/16-parent-read-loop.svg
@@ -26,11 +26,11 @@
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      inkscape:zoom="1.1350534"
-     inkscape:cx="411.43438"
-     inkscape:cy="363.41901"
+     inkscape:cx="381.92036"
+     inkscape:cy="324.65433"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
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@@ -2089,20 +2089,20 @@
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          height="15"
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-         style="stroke-width:0.174978;image-rendering:optimizeSpeed;fill:#ff0000"
+         style="stroke-width:0.174978;image-rendering:optimizeSpeed;fill:#ff0000;stroke:#ff0000;stroke-opacity:1"
          xlink:href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAfCAYAAACh+E5kAAABhGlDQ1BJQ0MgcHJvZmlsZQAAKJF9 kT1Iw0AcxV9bRSktFawg4pChOlkQFXHUKhShQqgVWnUwufQLmjQkKS6OgmvBwY/FqoOLs64OroIg +AHi6OSk6CIl/i8ptIjx4Lgf7+497t4B/kaFqWbXOKBqlpFOJoRsblXoeUUQYQygDxGJmfqcKKbg Ob7u4ePrXZxneZ/7c4SVvMkAn0A8y3TDIt4gnt60dM77xFFWkhTic+Ixgy5I/Mh12eU3zkWH/Twz amTS88RRYqHYwXIHs5KhEk8RxxRVo3x/1mWF8xZntVJjrXvyF4by2soy12kOI4lFLEGEABk1lFGB hTitGikm0rSf8PAPOX6RXDK5ymDkWEAVKiTHD/4Hv7s1C5MTblIoAXS/2PbHCNCzCzTrtv19bNvN EyDwDFxpbX+1Acx8kl5va7EjILINXFy3NXkPuNwBBp90yZAcKUDTXygA72f0TTmg/xYIrrm9tfZx +gBkqKvUDXBwCIwWKXvd4929nb39e6bV3w8q3nKKscjFLwAAAAZiS0dEAP8A/wD/oL2nkwAAAAlw SFlzAAAuIwAALiMBeKU/dgAAAAd0SU1FB+YKDRUYGD+J89cAAAAZdEVYdENvbW1lbnQAQ3JlYXRl ZCB3aXRoIEdJTVBXgQ4XAAABiElEQVRYw+1Y20rEMBA9M826bP0U1wdB9MX/B19E3NX/8GEVL5nj Q9JuWyNNRTHFDZSQZJhhLuckHay0IoDcr7jhhIrN5nZU8Or8Eo8vT8U5oBTLEhSUOZxalSVIALUs CABCgamHUAEQFEKtQgiG9PZMfTxrqlBAsd6eUKM+aUOVa8OZ+uwMXN/dlFdCwev5Ds2tbpbrAGcN Yg0gmXEGpoC4SAem0OghAwca/c80inJLSOftwIFG//o5PSUD65P1fmGdtDCgKb6Ww1lEGCzO3Sh0 5VP6Jthw33pKMGGMiTMOzlLyKX0TbEgtjjt7G3XgWI+w86/llRAgmQVeJgrCTcwfTG+zlkEJ/ZKN AOIuoGwAsAaIEGzvt4XSqPXv5t66ZRGWS6Pbh/HILhfLmf+RFfricNmNLQIXp2dxYRBWYLxpBAJK 6OFQiCYoFIt71vZ6CEKgoHig6QO1+jplmmkjv7ElwDPeZc+olmBZi7Pv7PkEfPxnFvpK34gNDd2x GY9aXFZnegVXpKcfnHHpyinb6ZAAAAAASUVORK5CYII= "
          id="image50850"
          x="97.006233"
          y="111.85227" />
       <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"
+         style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:'monospace Bold';stroke-width:0.265;fill:#ff0000;stroke-dasharray:none;fill-opacity:1;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:0.265;fill:#ff0000;stroke-dasharray:none;fill-opacity:1;-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>
     </g>
@@ -2112,7 +2112,7 @@
        id="path52862"
        sodipodi:nodetypes="cccc" />
     <path
-       style="fill:none;stroke:#ff0000;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 164.95174,41.699899 h 22.9205 v 27.123834 h 20.11199"
        id="path52911" />
     <path
@@ -2120,7 +2120,7 @@
        d="m 164.76942,37.039298 h 38.48161"
        id="path52913" />
     <path
-       style="fill:none;stroke:#ff0000;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 161.02013,52.048272 h 21.77513 v 75.725918 h 58.15801 v 12.77337 H 230.4018"
        id="path70938"
        sodipodi:nodetypes="cccccc" />
@@ -2174,13 +2174,13 @@
          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:#ff0000"
+       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"
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        y="43.379482"
        id="text4720"><tspan
          sodipodi:role="line"
          id="tspan4718"
-         style="stroke-width:0.264583;fill:#ff0000"
+         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="139.98645"
          y="43.379482">1  stdout</tspan></text>
     <text
@@ -2196,13 +2196,13 @@
          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:#ff0000"
+       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"
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        y="53.450417"
        id="text4728"><tspan
          sodipodi:role="line"
          id="tspan4726"
-         style="stroke-width:0.264583;fill:#ff0000"
+         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="140.21178"
          y="53.450417">3  p[0]</tspan></text>
     <rect
@@ -2217,7 +2217,7 @@
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        id="path80931" />
     <path
-       style="fill:none;stroke:#ff0000;stroke-width:0.25;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"
        d="m 166.71704,136.72533 h 28.71969 v 6.91204 l 6.95214,0"
        id="path80933"
        sodipodi:nodetypes="cccc" />
@@ -2268,13 +2268,13 @@
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     <text
        xml:space="preserve"
-       style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:monospace;fill:#ff0000;stroke-width:0.264583"
+       style="font-size:4.23333px;line-height:1.25;font-family:monospace;-inkscape-font-specification:'monospace Bold';fill:#ff0000;stroke-width:0.264583;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
        x="142.07907"
        y="137.91478"
        id="text4720-4"><tspan
          sodipodi:role="line"
          id="tspan4718-5"
-         style="fill:#ff0000;stroke-width:0.264583"
+         style="fill:#ff0000;stroke-width:0.264583;-inkscape-font-specification:'monospace Bold';font-family:monospace;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
          x="142.07907"
          y="137.91478">1  stdout</tspan></text>
     <text
@@ -2346,13 +2346,18 @@
     <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="22.594851"
-       y="87.305748"
+       x="134.81325"
+       y="11.451879"
        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="22.594851"
-         y="87.305748">tout le contenu du pipe est affiché</tspan></text>
+         x="134.81325"
+         y="11.451879">tout le contenu du pipe est affiché</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>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/17-child-exit.svg b/221018-pipe-example/fig/17-child-exit.svg
index 89d91ed401c939cea1d7565bdb0abdd9f1527dc5..c2a333885933c36f759d3d77a671d20222dc51e0 100644
--- a/221018-pipe-example/fig/17-child-exit.svg
+++ b/221018-pipe-example/fig/17-child-exit.svg
@@ -25,12 +25,12 @@
      inkscape:deskcolor="#d1d1d1"
      inkscape:document-units="mm"
      showgrid="false"
-     inkscape:zoom="1.3209394"
-     inkscape:cx="378.89702"
-     inkscape:cy="351.64369"
+     inkscape:zoom="0.93404521"
+     inkscape:cx="358.11971"
+     inkscape:cy="413.79153"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2213,20 +2213,20 @@
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        y="97.798691" />
     <path
-       style="fill:none;stroke:#ff0000;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 165.47167,131.42037 h 27.57058 V 42.641205 h 10.0746"
        id="path80931" />
     <path
-       style="fill:none;stroke:#ff0000;stroke-width:0.25;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"
        d="m 166.71704,136.72533 h 28.71969 v 6.91204 l 6.95214,0"
        id="path80933"
        sodipodi:nodetypes="cccc" />
     <path
-       style="fill:none;stroke:#ff0000;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 166.87657,142.08 h 31.08361 v -33.16707 h 6.43865"
        id="path80935" />
     <path
-       style="fill:none;stroke:#ff0000;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" />
     <g
@@ -2303,13 +2303,13 @@
            y="153.27026">4 </tspan></text>
       <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;fill:#ff0000"
+         style="font-size:4.23333px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif 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="153.60347"
          y="164.19684"
          id="text6972-1"><tspan
            sodipodi:role="line"
            id="tspan6970-9"
-           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;fill:#ff0000"
+           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:center;text-anchor:middle;stroke-width:0.264583;fill:#ff0000"
            x="153.60347"
            y="164.19684">processus fils</tspan></text>
     </g>
@@ -2357,5 +2357,21 @@
          style="stroke-width:0.264583"
          x="17.387365"
          y="153.69962">echo termine</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-weight:bold;font-size:4.9389px;line-height:1.25;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';stroke-width:0.264583"
+       x="129.16823"
+       y="176.23912"
+       id="text113863"><tspan
+         sodipodi:role="line"
+         id="tspan113861"
+         style="stroke-width:0.264583"
+         x="129.16823"
+         y="176.23912">terminaison du processus fils.</tspan><tspan
+         sodipodi:role="line"
+         style="stroke-width:0.264583"
+         x="129.16823"
+         y="182.41275"
+         id="tspan113865">sa table des fds est nettoyée</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 d9936f788f2ca5ac966737a2702cc95646ec4883..f3ff75d454f752b010c1c05ca1e527f0c0da4a95 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 @@
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      showgrid="false"
      inkscape:zoom="1.0261534"
-     inkscape:cx="491.15462"
-     inkscape:cy="362.03163"
+     inkscape:cx="384.44544"
+     inkscape:cy="373.7258"
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      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
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@@ -1452,7 +1452,8 @@
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              x="0"
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-             id="tspan3064">r</tspan></text>
+             id="tspan3064"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">r</tspan></text>
         <text
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@@ -1460,7 +1461,8 @@
            id="text3070"><tspan
              x="0"
              y="0"
-             id="tspan3068">e</tspan></text>
+             id="tspan3068"
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@@ -1468,7 +1470,8 @@
            id="text3074"><tspan
              x="0"
              y="0"
-             id="tspan3072">a</tspan></text>
+             id="tspan3072"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">a</tspan></text>
         <text
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@@ -1476,7 +1479,8 @@
            id="text3078"><tspan
              x="0"
              y="0"
-             id="tspan3076">d</tspan></text>
+             id="tspan3076"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">d</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(135.67847,13)"
@@ -1484,7 +1488,8 @@
            id="text3082"><tspan
              x="0"
              y="0"
-             id="tspan3080">(</tspan></text>
+             id="tspan3080"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">(</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(143.62488,13)"
@@ -1652,7 +1657,8 @@
            id="text3166"><tspan
              x="0"
              y="0"
-             id="tspan3164">)</tspan></text>
+             id="tspan3164"
+             style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-family:'DejaVu Sans Mono';-inkscape-font-specification:'DejaVu Sans Mono Bold';fill:#ff0000">)</tspan></text>
         <text
            xml:space="preserve"
            transform="translate(336,13)"
@@ -2258,25 +2264,19 @@
          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="163.83502"
-       y="133.8098"
+       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"
        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:#ff0000;stroke-width:0.264583"
-         x="163.83502"
-         y="133.8098">plus d'entrée ouverte !</tspan></text>
-    <text
-       xml:space="preserve"
-       style="font-size:4.9389px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583;fill:#ff0000;-inkscape-font-specification:'sans-serif Bold';font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
-       x="45.712601"
-       y="88.301353"
-       id="text181412"><tspan
+         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
          sodipodi:role="line"
-         id="tspan181410"
-         style="stroke-width:0.264583;fill:#ff0000;-inkscape-font-specification:'sans-serif Bold';font-family:sans-serif;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal"
-         x="45.712601"
-         y="88.301353">read renvoie 0</tspan></text>
+         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>
   </g>
 </svg>
diff --git a/221018-pipe-example/fig/19-parent-close.svg b/221018-pipe-example/fig/19-parent-close.svg
index c60f16c7b96c50a3d43bc80ca2712b72f1e74dec..2e42c78c849d4a0bfbd6ae404c4589bec3f8749a 100644
--- a/221018-pipe-example/fig/19-parent-close.svg
+++ b/221018-pipe-example/fig/19-parent-close.svg
@@ -26,11 +26,11 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="1.0261534"
-     inkscape:cx="475.56241"
-     inkscape:cy="354.23552"
+     inkscape:cx="477.0242"
+     inkscape:cy="355.21005"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2114,7 +2114,7 @@
        d="m 164.76942,37.039298 h 38.48161"
        id="path52913" />
     <path
-       style="fill:none;stroke:#ff0000;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 161.02013,52.048272 h 21.77513 v 75.725918 h 58.15801 v 12.77337 H 230.4018"
        id="path70938"
        sodipodi:nodetypes="cccccc" />
@@ -2190,13 +2190,13 @@
          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:#ff0000"
+       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="140.21178"
        y="53.450417"
        id="text4728"><tspan
          sodipodi:role="line"
          id="tspan4726"
-         style="stroke-width:0.264583;fill:#ff0000"
+         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="140.21178"
          y="53.450417">3  p[0]</tspan></text>
     <rect
diff --git a/221018-pipe-example/fig/20-parent-close-done.svg b/221018-pipe-example/fig/20-parent-close-done.svg
index 0a7655664feee12209d3ffe77da939f178cac379..2117ffd6c4e30abf2d4dd9c04b34529f9f66a0e2 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="475.56241"
-     inkscape:cy="354.23552"
+     inkscape:cx="477.0242"
+     inkscape:cy="355.21005"
      inkscape:window-width="1916"
      inkscape:window-height="1032"
-     inkscape:window-x="0"
+     inkscape:window-x="1920"
      inkscape:window-y="22"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1"
@@ -2236,19 +2236,19 @@
          y="153.69962">echo termine</tspan></text>
     <text
        xml:space="preserve"
-       style="font-size:4.9389px;line-height:1.25;font-family:sans-serif;stroke-width:0.264583;-inkscape-font-specification:'sans-serif Bold';font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal;fill:#ff0000"
+       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="139.5511"
-       y="165.02856"
+       y="170.14188"
        id="text185090"><tspan
          sodipodi:role="line"
          id="tspan185088"
-         style="stroke-width:0.264583;-inkscape-font-specification:'sans-serif Bold';font-family:sans-serif;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal;fill:#ff0000"
+         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="139.5511"
-         y="165.02856">plus aucune référence vers le pipe,</tspan><tspan
+         y="170.14188">plus aucune référence vers le pipe.</tspan><tspan
          sodipodi:role="line"
-         style="stroke-width:0.264583;-inkscape-font-specification:'sans-serif Bold';font-family:sans-serif;font-weight:bold;font-style:normal;font-stretch:normal;font-variant:normal;fill:#ff0000"
+         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="139.5511"
-         y="171.20219"
-         id="tspan185092">le système peut le supprimer</tspan></text>
+         y="176.31551"
+         id="tspan185092">le système est libre de le supprimer</tspan></text>
   </g>
 </svg>