Ajout de l'exo 2 TP5

TP5/Exo2/pipe-ex.c

@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+
+int main(int argc, char *argv[])
+{
+    pid_t p;
+    int fd[2];
+    char c;
+
+    if (pipe(fd) == -1)
+    {
+        exit(1);
+    }
+
+    p = fork();
+    assert(p != -1);
+
+    int id = 0;
+
+    if (p == 0)
+    {
+        id += 2;
+    }
+
+    p = fork();
+    assert(p != -1);
+
+    if (p == 0)
+    {
+        id += 1;
+    }
+
+    if (id == 0)
+    {
+        wait(NULL);
+        wait(NULL);
+    }
+
+    if (id == 2)
+    {
+        wait(NULL);
+    }
+
+
+    while (id == 1)
+    {
+        int w = write(fd[1], &p, sizeof(pid_t));
+        assert(w == sizeof(pid_t));
+
+        printf("%d sent %d\n", p, p);
+
+        sleep(3);
+    }
+
+    while (id == 3)
+    {
+        int op;
+        int r = read(fd[0], &op, sizeof(pid_t));
+        assert(r == sizeof(pid_t));
+
+        printf("\t%d received %d\n", p, op);
+
+        sleep(1);
+    }
+}