--- a/src/file.c	Mon Dec 17 16:55:22 2018 +0900
+++ b/src/file.c	Thu Jan 17 19:11:19 2019 +0900
@@ -98,6 +98,35 @@
     return -1;
 }
 
+__code cbc_fileread1 (int r, struct file *f, char *addr, int n, __code (*next)(int ret))
+{
+    if (r > 0)
+        f->off += r;
+    iunlock(f->ip);
+    goto next(r);
+}
+
+__code cbc_fileread (struct file *f, char *addr, int n, __code (*next)(int ret))
+{
+    int r;
+
+    if (f->readable == 0) {
+        goto next(-1);
+    }
+
+    if (f->type == FD_PIPE) {
+        goto cbc_piperead(f->pipe, addr, n, next);
+    }
+
+    if (f->type == FD_INODE) {
+        ilock(f->ip);
+
+        goto cbc_readi(f->ip, addr, f->off, n);
+    }
+
+    goto cbc_panic("fileread");
+}
+
 // Read from file f.
 int fileread (struct file *f, char *addr, int n)
 {