TP1

TP1/CMakeLists.txt

+cmake_minimum_required(VERSION 3.14)
+project(TD1)
+set(CMAKE_C_FLAGS "-Wall -Wformat")
+set(CMAKE_C_STANDARD 99)
+
+add_executable(TD1 main.c)
+add_executable(multimodo multimodo.c)
+add_executable(signal signal.c)
\ No newline at end of file

TP1/main.c

+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <wait.h>
+#include <stdarg.h>
+#include <string.h>
+#include <signal.h>
+
+void one() {
+    for (int i = 0; i < 10; i++) {
+        if (fork() == 0) {
+            for (int j = 0; j < 10; j++)printf("%d", i);
+            exit(0);
+        }
+        wait(NULL);
+    }
+
+}
+
+void helperPidPpid() {
+    printf("pid: %d ppid: %d\n", getpid(), getppid());
+}
+
+void two(int n) {
+    helperPidPpid();
+    for (int i = 0; i < n; ++i) {
+        pid_t pid = fork();
+        if (pid < 0) {
+            fprintf(stderr, "Process creation failed\n");
+            exit(-1);
+        }
+        if (pid == 0) {
+            helperPidPpid();
+            exit(0);
+        }
+    }
+}
+
+void twoBis(int n) {
+    helperPidPpid();
+    for (int i = 0; i < n; ++i) {
+        pid_t pid = fork();
+        if (pid < 0) {
+            fprintf(stderr, "Process creation failed\n");
+            exit(-1);
+        }
+        if (pid > 0) {
+            exit(0);
+        }
+        helperPidPpid();
+    }
+}
+
+void three(char *name, const char *fmt, ...) {
+    char **argvs = calloc(1, sizeof(char *));
+    int i = 0;
+    va_list args;
+    va_start(args, fmt);
+    while (*fmt != '\0') {
+        if (*fmt == 's') {
+            char *c = va_arg(args, char*);
+            argvs[i++] = strdup(c);
+            argvs = realloc(argvs, sizeof(char *) * (i + 1));
+        }
+        ++fmt;
+    }
+    va_end(args);
+    argvs[i] = NULL;
+    if (fork() == 0) {
+        execvp(name, argvs);
+        exit(0);
+    }
+    wait(NULL);
+    printf("Done\n");
+    for (int j = 0; j < i; j++) {
+        free(argvs[i]);
+    }
+    free(argvs);
+
+}
+
+
+void four(const char *fmt, ...) {
+    char **argvs = calloc(2, sizeof(char *));
+    argvs[0] = "multimodo";
+    printf("Launching : multimodo");
+    int i = 1;
+    va_list args;
+    va_start(args, fmt);
+    while (*fmt != '\0') {
+        if (*fmt == 's') {
+            char *c = va_arg(args, char*);
+            argvs[i++] = strdup(c);
+            printf(" %s", c);
+            argvs = realloc(argvs, sizeof(char *) * (i + 1));
+        }
+        ++fmt;
+    }
+    va_end(args);
+    argvs[i] = NULL;
+
+    printf("\n");
+    if (fork() == 0) {
+        execvp("multimodo", argvs);
+        exit(0);
+    }
+}
+
+void handler(int sig) { /* nouveau gestionnaire */
+    printf("signal SIGKILL recu !\n");
+    exit(0);
+}
+
+void five() {
+    if (fork()==0){
+        struct sigaction nvt, old;
+        memset(&nvt, 0, sizeof(nvt));
+        nvt.sa_handler = &handler;
+        sigaction(SIGINT, &nvt, &old);
+        pause();
+        for (int i = 0; i < 4; ++i) {
+            sigaction(SIGINT, &old, &old);
+            pause();
+        }
+    }
+}
+
+int main() {
+    printf("Question 1\n");
+    one();
+    printf("Question 2\n");
+    two(5);
+    printf("Question 2 Bis\n");
+    twoBis(5);
+    printf("Question 3\n");
+    three("ls", "sss", "ls", "-lt", "/");
+    printf("Question 4\n");
+    four("ss", "mkdir", "toto");
+    printf("Question 5\n");
+    five();
+    return 0;
+}
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TP1/multimodo.c

+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <wait.h>
+#include <string.h>
+
+int main(int argc, char * argv[]){
+    if (argc<2){
+        printf("Error, please give at least an argument\n");
+        exit(-1);
+    }
+    int status;
+
+    for (int i=0;i<5;i++){
+        pid_t pid =fork();
+        if (pid <0){
+            fprintf(stderr,"Error while creating the process\n");
+            exit(-1);
+        }
+        if (pid==0){
+            execvp(argv[1],argv+1);
+            fprintf(stderr,"The command was not found");
+            exit( -1);
+        }
+        else{
+            while (waitpid(pid,&status,WCONTINUED)>0){
+                if (WIFEXITED(status)){
+                    if (WEXITSTATUS(status)!=0){
+                        printf("The command exited with %d\n",status);
+                        goto end;
+                    }
+                    else{
+                        printf("The command was successful\n");
+                    }
+                }
+
+            }
+        }
+    }
+    end:;
+}
\ No newline at end of file

TP1/signal.c

+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <memory.h>
+void handler(int sig) { /* nouveau gestionnaire */
+    printf("signal SIGINT re¸cu !\n");
+}
+int main() {
+    struct sigaction nvt;
+    memset(&nvt, 0, sizeof(nvt));
+    nvt.sa_handler = &handler;
+    for (int i = 0; i < 5; ++i) {
+        sigaction(SIGINT, &nvt, NULL);
+        pause();
+    }
+}
\ No newline at end of file