tree.c course code example.

Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

diff --git a/.gitignore b/.gitignore
index 4d842c80b794138e19e99ee16328406203cf3a30..171ffa1f3919c94bd734e9ceac8918fd94c1996e 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -9,7 +9,9 @@ rw/writer/writer
 semaphore/semaphore
 signal/signaux0
 threads/exemple1
+tree/tree
 upipe/upipe
+
 TD3/exo[[:digit:]]/exo[[:digit:]]
 !TD3/exo[[:digit:]]/
 

diff --git a/tree/Makefile b/tree/Makefile
new file mode 100644 (file)
index 0000000..f1e3425
--- /dev/null
+++ b/tree/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=tree
+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/tree/tree.c b/tree/tree.c
new file mode 100644 (file)
index 0000000..0a33a18
--- /dev/null
+++ b/tree/tree.c
@@ -0,0 +1,19 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+    pid_t p;
+    int i, n = 5;
+
+    for (i = 0; i < n; i++) {
+        p = fork();
+        if (p > 0) {
+            break;
+        }
+        printf("Processus %d de pere %d\n", getpid(), getppid());
+        sleep(2);
+    }
+    sleep(1);
+    return 0;
+}