Ajout Exo2 TP4

TP4/Exo2/helpers.c

@@ -0,0 +1,19 @@
+#include "helpers.h"
+#include <signal.h>
+#include <time.h>
+
+int set_signal_handler(int signo, void (*handler)(int)) {
+    struct sigaction sa;
+    sa.sa_handler = handler;    // call `handler` on signal
+    sigemptyset(&sa.sa_mask);   // don't block other signals in handler
+    sa.sa_flags = SA_RESTART;            //  restart system calls
+    return sigaction(signo, &sa, NULL);
+}
+
+double tstamp(void) {                                                                                    
+	struct timespec tv;
+	clock_gettime(CLOCK_REALTIME, &tv);
+	return tv.tv_sec + tv.tv_nsec * 1.0e-9;
+}
+
+

TP4/Exo2/helpers.h

@@ -0,0 +1,7 @@
+#ifndef _HELPERS_H
+#define _HELPERS_H
+
+int set_signal_handler(int signo, void (*handler)(int));
+double tstamp(void);
+
+#endif

TP4/Exo2/mytimeout.c

@@ -0,0 +1,51 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include "helpers.c"
+#include "helpers.h"
+
+#define BUF_SIZE 256
+
+void kill_son(int)
+{
+    if (waitpid(-1, NULL, WNOHANG) == 0)
+    {
+        kill(0, SIGTERM);
+    }
+    else
+        exit(0);
+}
+int main(int argc, char **argv)
+{
+    char *args[argc - 1];
+    int secondes = (int)strtod(argv[1], NULL);
+    pid_t p;
+    if (argc < 3)
+    {
+        printf("Usage : %s <nbsec> <com> [arg]", argv[0]);
+        return EXIT_FAILURE;
+    }
+    for (int i = 2; i < argc; i++)
+    {
+        args[i - 2] = argv[i];
+    }
+    args[argc - 2] = NULL;
+    p = fork();
+    switch (p)
+    {
+    case 0:
+        execvp(argv[2], args);
+        exit(0);
+    case -1:
+        exit(EXIT_FAILURE);
+    default:
+        alarm(secondes);
+        set_signal_handler(SIGALRM, &kill_son);
+        sleep(secondes);
+    }
+    exit(0);
+}