libc: Add DT_* macros to dirent.h

libs/libc/include/dirent.h

@@ -14,6 +14,15 @@ struct dirent
     char d_name[NAME_MAX];
 };
 
+#define DT_BLK 1     // This is a block device.
+#define DT_CHR 2     // This is a character device.
+#define DT_DIR 3     // This is a directory.
+#define DT_FIFO 4    // This is a named pipe (FIFO).
+#define DT_LNK 5     // This is a symbolic link.
+#define DT_REG 6     // This is a regular file.
+#define DT_SOCK 7    // This is a UNIX domain socket.
+#define DT_UNKNOWN 0 // The file type could not be determined.
+
 /* A stream representing a directory. */
 typedef struct
 {

libs/libc/src/dirent.cpp

@@ -46,7 +46,7 @@ extern "C"
         result.d_ino = ent.inode;
         result.d_reclen = sizeof(result);
         result.d_off = ent.offset;
-        result.d_type = 0;
+        result.d_type = DT_UNKNOWN;
         strlcpy(result.d_name, ent.name, NAME_MAX);
         return &result;
     }