X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flib%2Fuser%2Fsyscall.h;h=8a9e0c013e91a74bb87b318b7f2f3f094c341bd6;hb=0951a7af1bd8e78b5991edd7de9d0370b2d2d72b;hp=d03eae163ef371956b911277f75575637da18053;hpb=615bf3b3d2a8573ed6fb9ddc0055745e163ac999;p=pintos-anon

diff --git a/src/lib/user/syscall.h b/src/lib/user/syscall.h
index d03eae1..8a9e0c0 100644
--- a/src/lib/user/syscall.h
+++ b/src/lib/user/syscall.h
@@ -4,12 +4,22 @@
 #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);
@@ -23,10 +33,16 @@ int write (int fd, const void *buffer, unsigned length);
 void seek (int fd, unsigned position);
 unsigned tell (int fd);
 void close (int fd);
+
+/* 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 */