diff --git a/ASR3.1/TP04 processus recouvrement/a.out b/ASR3.1/TP04 processus recouvrement/a.out
new file mode 100755
index 0000000..6186b14
Binary files /dev/null and b/ASR3.1/TP04 processus recouvrement/a.out differ
diff --git a/ASR3.1/TP04 processus recouvrement/ouvrir.c b/ASR3.1/TP04 processus recouvrement/ouvrir.c
new file mode 100644
index 0000000..f79d4b3
--- /dev/null
+++ b/ASR3.1/TP04 processus recouvrement/ouvrir.c	
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+typedef struct assoc {
+	char * ext;
+	char * exe;
+} assoc;
+
+
+
+int main(int argc, char const *argv[]){
+
+
+	assoc assocs [] = {
+	{"pdf","/usr/bin/xpdf"},
+	{"html","/usr/bin/firefox"},
+	{"c","/usr/bin/vim"}
+	/* etc */
+};
+
+
+	if (argc < 2){
+		printf("Usage : %s <file>\n", argv[2]);
+        return EXIT_FAILURE;
+    }
+	
+
+	char * extension = strrchr (argv[1], '.') + 1; // pour récupérer la chaine suivant (+1)
+
+	if (extension == NULL){
+		printf ("Pas d'extensions \n");
+	} else {
+		printf ("extention : %s\n", extension);
+	}
+
+
+	for (int i = 0; i < assoc; i++){
+		if (strcmp (extension, assocs[i]) == 0){
+			printf("ok\n");
+		}
+	}
+	
+
+	return EXIT_FAILURE;
+}
\ No newline at end of file
diff --git a/ASR3.1/TP04 processus recouvrement/sum.c b/ASR3.1/TP04 processus recouvrement/sum.c
new file mode 100644
index 0000000..1d11f52
--- /dev/null
+++ b/ASR3.1/TP04 processus recouvrement/sum.c	
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <time.h>
+static inline double tstamp(void)
+{    
+	struct timespec tv;
+	clock_gettime(CLOCK_REALTIME, &tv);
+	return tv.tv_sec + tv.tv_nsec * 1.0e-9;
+}
+void somme_partielle(long int * sommes,long int n,long int N,long int M)
+{
+	long int S = 0;
+	for(long int i = n;i<=N;i+=M)
+		S+=i;
+
+	//printf("%d = %ld\n",getpid(),S);
+	sommes[n-1] = S;
+}
+
+int main(int argc, char *argv[])
+{
+	long int N,
+		 M,
+		 S=0;
+	long int * sommes = NULL;
+	double start,end;
+
+	start = tstamp();
+	assert(argc == 3);
+	N=strtol(argv[1],NULL,0);
+	M=strtol(argv[2],NULL,0);
+
+	sommes = (long int *) mmap(NULL,M*sizeof(long int),
+			PROT_WRITE,MAP_ANONYMOUS|MAP_SHARED,-1,0);	
+
+	for (long int i = 0;i<M;i++){
+		if (fork() == 0){
+
+			somme_partielle(sommes,i+1,N,M);		
+			exit(0);
+		}
+
+	}
+	for(long int i = 0;i<M;i++)
+		wait(NULL);
+
+	for(long int i = 0;i<M;i++)
+		S+=sommes[i];
+	end = tstamp();
+	printf("time = %lf somme = %ld\n",end - start,S);
+	assert (S == N*(N+1)/2);
+	return 0;
+}