diff --git a/c/design-test/Makefile b/c/design-test/Makefile
new file mode 100644
index 0000000..817a957
--- /dev/null
+++ b/c/design-test/Makefile
@@ -0,0 +1,33 @@
+#SOURCE= vlc
+#CFLAGS=$(shell pkg-config --libs vlc)
+#
+#all: compilationvlc
+#
+#compilationvlc:
+#	$(CC) $(SOURCE).c -o $(SOURCE) $(CFLAGS)
+
+CC=gcc
+CFLAGS=-c -Wall -g
+LDFLAGS=
+CFILES=$(wildcard *.c) # CFILES => recompiles everything on a C file change
+EXEC=$(basename $(wildcard *.c))
+#SOURCES=$(wildcard *.c)
+TESTS=$(addsuffix .test, $(EXEC))
+
+all: $(SOURCES) $(EXEC)
+
+$(EXEC): $(CFILES)
+	$(CC) $(LDFLAGS) $@.c -o $@
+
+.c.o:
+	$(CC) $(CFLAGS) $< -o $@
+
+clean:
+	@-rm $(EXEC)
+
+# to test a binary "prog" : make prog.test
+
+$(TESTS):
+	valgrind --leak-check=full -v --track-origins=yes ./$(basename $@)
+
+test: all $(TESTS)
diff --git a/c/design-test/com-child.c b/c/design-test/com-child.c
new file mode 100644
index 0000000..65ddba7
--- /dev/null
+++ b/c/design-test/com-child.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char * argv[])
+{
+
+    char buf[BUFSIZ];
+    read (0, buf, BUFSIZ);
+    buf[BUFSIZ-1] = '\0';
+    printf ("%s", buf);
+
+    return EXIT_SUCCESS;
+}
diff --git a/c/design-test/com-parent.c b/c/design-test/com-parent.c
new file mode 100644
index 0000000..89b6149
--- /dev/null
+++ b/c/design-test/com-parent.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+#define CHILDBIN "./com-child"
+
+int main(int argc, char * argv[])
+{
+
+    if (argc < 2) {
+        fprintf (stderr, "usage : %s string\n", argv[0]);
+        exit (EXIT_FAILURE);
+    }
+
+    int in[2], out[2];
+    FILE *in_fp, *out_fp;
+
+    pipe(in);
+    pipe(out);
+
+    if (fork()) { // PARENT
+
+        close(in[0]);
+        close(out[1]);
+
+        write (in[1], argv[1], strlen(argv[1]));
+
+        char buf[BUFSIZ];
+        read (out[0], buf, BUFSIZ);
+        buf[BUFSIZ-1] = '\0';
+
+        printf ("response : %s\n", buf);
+
+    } else { // CHILD
+
+        close(0);
+        close(1);
+
+        dup2(in[0], 0);
+        dup2(out[1], 1);
+
+        execv(CHILDBIN, NULL);
+    }
+
+    int status;
+    wait(&status);
+    // do something with the status
+
+    return EXIT_SUCCESS;
+}
+