X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flib%2Fuser%2Fsyscall.h;h=8a9e0c013e91a74bb87b318b7f2f3f094c341bd6;hb=0db48366884f3d6418217b926c4febc1bc2a3c13;hp=d9487d3df7b73ad67872be69dae90697990095f3;hpb=bfc9e18a6723b2315ef521282a8b42119338ece9;p=pintos-anon

diff --git a/src/lib/user/syscall.h b/src/lib/user/syscall.h
index d9487d3..8a9e0c0 100644
--- a/src/lib/user/syscall.h
+++ b/src/lib/user/syscall.h
@@ -4,14 +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);
@@ -25,8 +33,12 @@ 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);
 bool readdir (int fd, char name[READDIR_MAX_LEN + 1]);