From bb3dd2915f58fa911e2d5df37bc2d2327c5c8430 Mon Sep 17 00:00:00 2001
From: =?utf8?q?J=C3=A9r=C3=B4me=20Benoit?= <jerome.benoit@piment-noir.org>
Date: Tue, 30 May 2017 23:20:23 +0200
Subject: [PATCH] Add exercice #7 code
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Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>
---
 TD1/part_two/Makefile | 79 +++++++++++++++++++++++++++++++++++++++++++
 TD1/part_two/exo.c    | 58 +++++++++++++++++++++++++++++++
 2 files changed, 137 insertions(+)
 create mode 100644 TD1/part_two/Makefile
 create mode 100644 TD1/part_two/exo.c

diff --git a/TD1/part_two/Makefile b/TD1/part_two/Makefile
new file mode 100644
index 0000000..69a544d
--- /dev/null
+++ b/TD1/part_two/Makefile
@@ -0,0 +1,79 @@
+# 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=td1
+BUILD_TYPE=debug
+
+# ====================================
+# 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
+STRIP_FLAG =
+OPTI_FLAG = -O0
+else
+BUILDDIR := .build/release
+DEBUG_FLAG =
+STRIP_FLAG = -s
+OPTI_FLAG = -O3
+endif
+
+CFLAGS := $(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/TD1/part_two/exo.c b/TD1/part_two/exo.c
new file mode 100644
index 0000000..0194d04
--- /dev/null
+++ b/TD1/part_two/exo.c
@@ -0,0 +1,58 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+void show_proc_pids() {
+    pid_t current_pid = getpid();
+    pid_t parent_pid = getppid();
+
+    printf("[%d] Mon PID: %d\n", current_pid, current_pid);
+    printf("[%d] PID du parent: %d\n", current_pid, parent_pid);
+}
+
+int main() {
+    int pipefd[2];
+    char buf;
+    printf("Courant:\n");
+    show_proc_pids();
+
+    if (pipe(pipefd) == -1) {
+        printf("Pipe creation erreur\n");
+        exit(EXIT_FAILURE);
+    };
+
+    pid_t cpid = fork();
+
+    if (cpid == -1) {
+        printf("Erreur de clonage\n");
+        exit(EXIT_FAILURE);
+    } else if (cpid == 0) {
+        printf("Fils:\n");
+        show_proc_pids();
+        const char* msg = "Coucou papa !";
+        close(pipefd[0]);
+        write(pipefd[1], msg, strlen(msg));
+        close(pipefd[1]);
+        exit(EXIT_SUCCESS);
+    } else {
+        printf("Parent:\n");
+        show_proc_pids();
+        close(pipefd[1]);
+        
+        while (read(pipefd[0], &buf, 1) > 0) {
+            write(STDOUT_FILENO, &buf, 1);
+        }
+                       
+        write(STDOUT_FILENO, "\n", 1);
+        close(pipefd[0]);
+        wait(NULL);
+        exit(EXIT_SUCCESS);
+    }
+    
+    /* unreachable code */
+    return EXIT_SUCCESS;
+}
-- 
2.34.1