Added new routines that map and check the validity of user buffers.

mmap uses this mechanism to get arguments. It needs to be tested.

tasks/test0/main.c

@@ -22,9 +22,10 @@ void wait_pager(l4id_t partner)
 	// printf("Pager synced with us.\n");
 }
 
+pid_t pid;
+
 void main(void)
 {
-	pid_t pid;
 
 	printf("\n%s: Started with tid %d.\n", __TASKNAME__, self_tid());
 	/* Sync with pager */
@@ -32,12 +33,16 @@ void main(void)
 
 	dirtest();
 
+	/* Check mmap/munmap */
+	mmaptest();
+
 	printf("Forking...\n");
 
 	if ((pid = fork()) < 0)
 		printf("Error forking...\n");
 
 	if (pid == 0) {
+		pid = getpid();
 		printf("Child: file IO test 1.\n");
 		if (fileio() == 0)
 			printf("-- PASSED --\n");
@@ -56,12 +61,10 @@ void main(void)
 		else
 			printf("-- FAILED --\n");
 	}
+
 	while (1)
 		wait_pager(0);
 #if 0
-	/* Check mmap/munmap */
-	mmaptest();
-
 	/* Check shmget/shmat/shmdt */
 	shmtest();
 #endif

tasks/test0/src/forktest.c

@@ -8,6 +8,7 @@
 #include <tests.h>
 
 int global = 0;
+extern pid_t pid;
 
 int forktest(void)
 {
@@ -18,6 +19,7 @@ int forktest(void)
 		fork();
 
 	myid = getpid();
+	pid = myid;
 	if (global != 0) {
 		printf("-- FAILED --\n");
 		goto out;