First commit

content/progsys/TDM_3-processus/src/q1.c

@@ -0,0 +1,9 @@
+#include <unistd.h>
+#include <stdlib.h>
+int main(int argc, char **argv) {
+    fork();
+    fork();
+    fork();
+    sleep(10);
+    exit(EXIT_SUCCESS);
+}

content/progsys/TDM_3-processus/src/q2.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/wait.h>
+
+int main (int argc, char **argv) {
+    pid_t pid;
+    int status;
+    pid = fork ();
+    if ( pid < 0 ){
+        printf("Error: %s\n", strerror(errno));
+        exit(EXIT_FAILURE);
+    }
+
+    if ( pid == 0){
+        printf(" Into child, command : %s\n",argv[1]);
+        // we are in children
+        int out = execvp(argv[1], &argv[1]);
+        if ( out == -1 ){
+            printf("Error : %s\n",strerror(errno));
+            exit(EXIT_FAILURE);
+        }
+        exit(EXIT_SUCCESS);
+    }
+    else {
+        // if child exit code is not 0 then exit father with EXIT_FAILURE
+        while ((pid = waitpid(pid, &status, 0)) > 0){
+            (status == 0) ? exit(EXIT_SUCCESS) : exit(EXIT_FAILURE);
+        };
+    }
+}

content/progsys/TDM_3-processus/src/q3.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/wait.h>
+
+int main(int argc, char **argv){
+    if (argc > 2) {
+        printf("Error : %s must have one argument\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+    if (argv[1] == NULL) {
+        printf("Execute child process\n");
+        exit(EXIT_SUCCESS);
+    }
+    else {
+        int x = atoi(argv[1]);
+        printf("Number of children to create : %d\n", x);
+        for (int i=0; i < x ; i++){
+            int pid = fork();
+            if (pid == -1) {
+                printf("Error : %s", strerror(errno));
+                exit(EXIT_FAILURE);
+            }
+            if (pid == 0) {
+                // we are in our children
+                if ((execl(argv[0],"",NULL)) < 0 ) {
+                    printf("Error : %s\n", strerror(errno));
+                    exit(EXIT_FAILURE);
+                }
+            }
+
+        }
+    }
+    exit(EXIT_SUCCESS);
+}

content/progsys/TDM_3-processus/src/q3bis.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/wait.h>
+
+int main(int argc, char **argv){
+    if (argv[1] == NULL) {
+        printf("Error : %s must have one argument\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+    printf("Execute programme number %s\n",argv[1]); 
+    int r = atoi(argv[1]) - 1;
+    if (r > 0){
+        int pid = fork();
+        if (pid == -1) {
+            printf("Error : %s", strerror(errno));
+            exit(EXIT_FAILURE);
+        }
+        if (pid == 0) {
+            // we are in our children
+            char args[12] = "";
+            sprintf(args,"%i", r);
+            if ((execl(argv[0], argv[0], args, NULL)) < 0 ) {
+                printf("Error : %s\n", strerror(errno));
+                exit(EXIT_FAILURE);
+            }
+        }
+    }
+    else {
+        printf("This is the end!\n");
+    }
+    exit(EXIT_SUCCESS);
+}