Added posix code

conts/posix/test0/src/forktest.c

@@ -0,0 +1,55 @@
+/*
+ * Fork test.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <tests.h>
+#include <l4/macros.h>
+
+int global = 0;
+
+
+int forktest(void)
+{
+	pid_t myid;
+
+
+	/* 16 forks */
+	for (int i = 0; i < 4; i++) {
+		test_printf("%d: Forking...\n", getpid());
+		if (fork() < 0)
+			goto out_err;
+	}
+
+	myid = getpid();
+
+	if (global != 0) {
+		test_printf("Global not zero.\n");
+		test_printf("-- FAILED --\n");
+		goto out_err;
+	}
+	global += myid;
+
+	if (global != myid)
+		goto out_err;
+
+
+	if (getpid() != parent_of_all) {
+		/* Exit here to exit successful children */
+		//_exit(0);
+		//BUG();
+	}
+
+	if (getpid() == parent_of_all)
+		printf("FORK TEST           -- PASSED --\n");
+
+	return 0;
+
+	/* Any erroneous child or parent comes here */
+out_err:
+	printf("FORK TEST           -- FAILED --\n");
+	return 0;
+}
+