#include <stdbool.h>
#include <debug.h>
+/* Process identifier. */
typedef int pid_t;
+#define PID_ERROR ((pid_t) -1)
+/* Map region identifier. */
+typedef int mapid_t;
+#define MAP_FAILED ((mapid_t) -1)
+
+/* Maximum characters in a filename written by readdir(). */
+#define READDIR_MAX_LEN 14
+
+/* Typical return values from main() and arguments to exit(). */
+#define EXIT_SUCCESS 0 /* Successful execution. */
+#define EXIT_FAILURE 1 /* Unsuccessful execution. */
+
+/* Projects 2 and later. */
void halt (void) NO_RETURN;
void exit (int status) NO_RETURN;
pid_t exec (const char *file);
-int join (pid_t);
-bool create (const char *file);
+int wait (pid_t);
+bool create (const char *file, unsigned initial_size);
bool remove (const char *file);
int open (const char *file);
int filesize (int fd);
int read (int fd, void *buffer, unsigned length);
int write (int fd, const void *buffer, unsigned length);
+void seek (int fd, unsigned position);
+unsigned tell (int fd);
void close (int fd);
-bool mmap (int fd, void *addr, unsigned length);
-bool munmap (void *addr, unsigned length);
+
+/* Project 3 and optionally project 4. */
+mapid_t mmap (int fd, void *addr);
+void munmap (mapid_t);
+
+/* Project 4 only. */
bool chdir (const char *dir);
bool mkdir (const char *dir);
-void lsdir (void);
+bool readdir (int fd, char name[READDIR_MAX_LEN + 1]);
+bool isdir (int fd);
+int inumber (int fd);
#endif /* lib/user/syscall.h */