From dd9d44136d6788366f0e5f37905d5ee67eda8b92 Mon Sep 17 00:00:00 2001
From: =?utf8?q?J=C3=A9r=C3=B4me=20Benoit?= <jerome.benoit@piment-noir.org>
Date: Mon, 26 Feb 2018 22:02:43 +0100
Subject: [PATCH] Add anonymous pipe course code.
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Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>
---
 .gitignore     |  1 +
 upipe/Makefile | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++
 upipe/upipe.c  | 33 ++++++++++++++++++++
 3 files changed, 117 insertions(+)
 create mode 100644 upipe/Makefile
 create mode 100644 upipe/upipe.c

diff --git a/.gitignore b/.gitignore
index 6612f92..3f40103 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@ TD3/exo2/monexec/monexec
 philosophe/philosophe
 prodcons/prodcons
 threads/exemple1
+upipe/upipe
 exo[[:digit:]]
 !exo[[:digit:]]/
 
diff --git a/upipe/Makefile b/upipe/Makefile
new file mode 100644
index 0000000..e4cac66
--- /dev/null
+++ b/upipe/Makefile
@@ -0,0 +1,83 @@
+# Sample Makefile to build simple project.
+#
+# This Makefile expect all source files (.c) to be at the same level, in the
+# current working directory.
+#
+# It will automatically generate dependencies, compile all files, and produce a
+# binary using the provided name.
+#
+# Set BINARY_NAME to the name of the binary file to build.
+# Set BUILD_TYPE to either debug or release
+#
+# Automatic dependencies code from:
+# http://make.mad-scientist.net/papers/advanced-auto-dependency-generation/#tldr
+BINARY_NAME=upipe
+BUILD_TYPE=debug
+#BUILD_TYPE=release
+LDLIBS=-lpthread
+
+# ====================================
+# DO NOT CHANGE STUFF BEYOND THIS LINE
+# ====================================
+
+all: $(BINARY_NAME)
+
+CC=gcc
+LD=gcc
+
+WARN_FLAGS = -Wall -Wextra
+STD_FLAG = -std=c11
+
+ifeq ($(BUILD_TYPE),debug)
+BUILDDIR := .build/debug
+DEBUG_FLAG = -g
+DEBUG = 1
+STRIP_FLAG =
+OPTI_FLAG = -O0
+else
+BUILDDIR := .build/release
+DEBUG_FLAG =
+DEBUG = 0
+STRIP_FLAG = -s
+OPTI_FLAG = -O3
+endif
+
+CFLAGS := -DDEBUG=$(DEBUG) $(CFLAGS) $(WARN_FLAGS) $(STD_FLAG) $(OPTI_FLAG) $(DEBUG_FLAG)
+LDFLAGS := $(LDFLAGS) $(STRIP_FLAG)
+
+OBJDIR := $(BUILDDIR)/objs
+$(shell mkdir -p $(OBJDIR))
+
+SRCS=$(wildcard *.c)
+OBJS=$(patsubst %.c,$(OBJDIR)/%.o,$(SRCS))
+
+DEPDIR := $(BUILDDIR)/deps
+$(shell mkdir -p $(DEPDIR))
+DEPFLAGS = -MT $@ -MMD -MP -MF $(DEPDIR)/$*.Td
+POSTCOMPILE = mv -f $(DEPDIR)/$*.Td $(DEPDIR)/$*.d
+
+$(BINARY_NAME): $(OBJS)
+	@echo "[LD ] $@"
+	@$(LD) $(CFLAGS) $(LDFLAGS) $^ $(LDLIBS) -o $@
+
+$(OBJDIR)/%.o: %.c $(DEPDIR)/%.d
+	@echo "[C  ] $*"
+	@$(CC) $(DEPFLAGS) $(CFLAGS) -c $< -o $@
+	@$(POSTCOMPILE)
+
+$(DEPDIR)/%.d: ;
+
+.PRECIOUS: $(DEPDIR)/%.d
+
+include $(wildcard $(patsubst %,$(DEPDIR)/%.d,$(basename $(SRCS))))
+
+clean:
+	@echo "[CLN]"
+	-@rm -r $(BUILDDIR)
+	-@rm $(BINARY_NAME)
+
+disassemble: $(BINARY_NAME)
+	objdump -d $< | less
+
+symbols: $(BINARY_NAME)
+	objdump -t $< | sort | less
diff --git a/upipe/upipe.c b/upipe/upipe.c
new file mode 100644
index 0000000..1264fb2
--- /dev/null
+++ b/upipe/upipe.c
@@ -0,0 +1,33 @@
+#include <sys/types.h>		// pour les types
+#include <unistd.h>		// pour fork, pipe, read, write, close
+#include <stdio.h>		// pour printf
+#include <string.h>
+
+#define R 0
+#define W 1
+
+int main()
+{
+	int fd[2];
+	pipe(fd);		// création d'un tube anonyme
+	char message[100];	// pour récupérer un message
+	int nboctets;
+	char *phrase = "message envoyé au père par le fils";
+	if (fork() == 0)	//création d'un processus fils
+	{
+		close(fd[R]);	//Le fils ferme le descripteur non utilisé de lecture
+		// dépôt dans le tube du message
+		write(fd[W], phrase, strlen(phrase) + 1);
+		close(fd[W]);	// fermeture du descripteur d'écriture
+	}
+	{
+		// Le père ferme le descripteur non utilisé d'écriture
+		close(fd[W]);
+		// extraction du message du tube
+		nboctets = read(fd[R], message, 100);
+		printf("Lecture %d octets : %s\n", nboctets, message);
+		// fermeture du descripteur de lecture
+		close(fd[R]);
+	}
+	return 0;
+}
-- 
2.34.1