From: Jérôme Benoit Date: Mon, 26 Feb 2018 21:02:43 +0000 (+0100) Subject: Add anonymous pipe course code. X-Git-Url: https://git.piment-noir.org/?a=commitdiff_plain;h=dd9d44136d6788366f0e5f37905d5ee67eda8b92;p=TD_SE.git Add anonymous pipe course code. Signed-off-by: Jérôme Benoit --- 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 // pour les types +#include // pour fork, pipe, read, write, close +#include // pour printf +#include + +#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; +}