diff --git a/doc/lab04-multiprocessing/main.typ b/doc/lab04-multiprocessing/main.typ
new file mode 100644
index 0000000..9cafa8a
--- /dev/null
+++ b/doc/lab04-multiprocessing/main.typ
@@ -0,0 +1,3 @@
+#import "/doc/metadata.typ": *
+
+= Multiprocessing
diff --git a/src/04-multiprocessing/.clangd b/src/04-multiprocessing/.clangd
new file mode 100644
index 0000000..7c98f3d
--- /dev/null
+++ b/src/04-multiprocessing/.clangd
@@ -0,0 +1,13 @@
+CompileFlags:
+    Add:
+        # Architecture and cross-compilation
+        - "--target=aarch64-linux-gnu"
+
+        # Setup sysroot for buildroot
+        - "--sysroot=/buildroot/output/host/aarch64-buildroot-linux-gnu/sysroot"
+
+        # Add specific header of linux from buildroot
+        - "-I/buildroot/output/build/linux-headers-5.15.148/include"
+        - "-I/buildroot/output/build/linux-headers-5.15.148/arch/arm64/include"
+        - "-I/buildroot/output/build/linux-headers-5.15.148/arch/arm64/include/generated"
+        - "-I/buildroot/output/build/linux-headers-5.15.148/**"
diff --git a/src/04-multiprocessing/Makefile b/src/04-multiprocessing/Makefile
new file mode 100644
index 0000000..0b71c82
--- /dev/null
+++ b/src/04-multiprocessing/Makefile
@@ -0,0 +1,5 @@
+EXE=multiprocessing
+SRCS=$(wildcard *.c)
+
+# Include the standard application Makefile for the CSEL1 labs
+include ../appl.mk
diff --git a/src/04-multiprocessing/justfile b/src/04-multiprocessing/justfile
new file mode 100644
index 0000000..2373be9
--- /dev/null
+++ b/src/04-multiprocessing/justfile
@@ -0,0 +1,7 @@
+build:
+    make
+
+clean:
+    rm -rf build
+    rm -rf .obj
+    rm multiprocessing
diff --git a/src/04-multiprocessing/main.c b/src/04-multiprocessing/main.c
new file mode 100644
index 0000000..ef1d352
--- /dev/null
+++ b/src/04-multiprocessing/main.c
@@ -0,0 +1,100 @@
+#include <stdio.h>
+
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <syslog.h>
+#include <string.h>
+
+#include <signal.h>
+
+
+const char * MSG = "Nique ta mère !!\0";
+
+static void catch_signal(int signal) {
+
+    switch (signal) {
+        case SIGHUP:
+            printf("SIGHUP received\n");
+            break;
+        case SIGINT:
+            printf("SIGINT received\n");
+            break;
+        case SIGQUIT:
+            printf("SIGQUIT received\n");
+            break;
+        case SIGTERM:
+            printf("SIGTERM received\n");
+            break;
+        case SIGABRT:
+            printf("SIGABRT received\n");
+            break;
+    }
+
+
+}
+
+static void install_catch_signal()
+{
+    struct sigaction act = {
+        .sa_handler = catch_signal,
+    };
+    sigemptyset(&act.sa_mask);
+    sigaction(SIGHUP, &act, 0);
+    sigaction(SIGINT, &act, 0);
+    sigaction(SIGQUIT, &act, 0);
+    sigaction(SIGTERM, &act, 0);
+    sigaction(SIGABRT, &act, 0);
+}
+
+
+int main(int argc, char* argv[]) {
+
+    install_catch_signal();
+
+    /* Setup socket for inter-process communication */
+    int fd[2];
+    int err = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
+    if (err == -1) {
+        perror("socketpair fail");
+        exit(1);
+    }
+
+    /* Fork a child process */
+    pid_t pid = fork();
+    if (pid == 0) {
+        /* Parent processus */
+        printf("Parent processus: pid=%d\n", pid);
+
+
+
+        while(1) {
+            write(fd[0], MSG, strlen(MSG));
+            sleep(1);
+        }
+
+
+    } else if (pid > 0) {
+        /* Child processus */
+        printf("Child processus: pid=%d\n", pid);
+        char buffer[strlen(MSG)];
+
+        while(1) {
+            read(fd[1], buffer, strlen(MSG));
+            printf("%s\n", buffer);
+            sleep(1);
+        }
+
+    } else {
+        /* error */
+        perror("fork fail");
+        exit(1);
+    }
+
+
+    return 0;
+}
diff --git a/src/04-multiprocessing/multiprocessing b/src/04-multiprocessing/multiprocessing
new file mode 100755
index 0000000..ecd66d3
Binary files /dev/null and b/src/04-multiprocessing/multiprocessing differ