diff --git a/bootstrap.fs b/bootstrap.fs
index f005295..882e2df 100644
--- a/bootstrap.fs
+++ b/bootstrap.fs
@@ -1374,8 +1374,8 @@ decimal
 
 \ file access methods (fam)
 0x00 constant R/O  \ read-only
-0x01 constant R/W  \ read-write
-0x02 constant W/O  \ write-only
+0x01 constant W/O  \ write-only
+0x02 constant R/W  \ read-write
 
 \ File
 struct
@@ -1944,24 +1944,15 @@ codegen-target @ s" i386-linux" str= [if]
 
 ( === File I/O === )
 
-5 constant SYS_OPEN
-6 constant SYS_CLOSE
-
-: fam-to-mode ( fam -- u )
-    case
-    R/O of 0x00 endof
-    W/O of 0x01 endof
-    R/W of 0x02 endof
-        FILE-IO-ERROR throw
-    endcase
-;
+5 constant SYS-OPEN
+6 constant SYS-CLOSE
 
 : (open-file) ( c-addr fam -- obj f )
-    fam-to-mode swap SYS_OPEN syscall2 dup 0>=
+    swap SYS-OPEN syscall2 dup 0>=
 ;
 
-: (close-file) ( obj -- f)
-    SYS_CLOSE syscall1 0>=
+: (close-file) ( obj -- f )
+    SYS-CLOSE syscall1 0>=
 ;
 
 [else] \ i386-linux
diff --git a/others/planck.c b/others/planck.c
index f924d5b..82048a5 100644
--- a/others/planck.c
+++ b/others/planck.c
@@ -8,6 +8,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
 
 typedef uintptr_t cell;
 typedef void (**cfa)();
@@ -153,5 +157,19 @@ defbinary("|", or, |, uintptr_t)
 defbinary("^", xor, ^, uintptr_t)
 defbinary("<", lt, <, intptr_t)
 defbinary("=", eq, ==, intptr_t)
+defcode("(open-file)", openfile) {
+    int flags = pop();
+    char *name = (char*) pop();
+    int fd = open(name, flags);
+    push(fd);
+    push(fd >= 0);
+    next();
+}
+defcode("(close-file)", closefile) {
+    int fd = pop();
+    int r = close(fd);
+    push(r >= 0);
+    next();
+}
 
 #endif
diff --git a/others/planck.py b/others/planck.py
index 5cfcec4..a6fd38f 100644
--- a/others/planck.py
+++ b/others/planck.py
@@ -3,6 +3,7 @@
 # Copyright (C) 2021 nineties
 #
 
+import os
 import sys
 import operator
 
@@ -60,6 +61,15 @@ def comma_string(s):
         comma_byte(ord(c))
     comma_byte(0)
 
+def read_string(addr):
+    s = ""
+    while True:
+        c = read_byte(addr)
+        if c == 0: break
+        s += chr(c)
+        addr += 1
+    return s
+
 def find(c):
     it = read(LATEST_CELL)
     while it != 0:
@@ -197,6 +207,18 @@ def argv():
     push(ARGV_ADDR)
     push(len(sys.argv))
 add_simple_operator('v', argv)
+def openfile():
+    flag = pop()
+    name = read_string(pop())
+    fd = os.open(name, flag)
+    push(fd)
+    push(fd >= 0)
+def closefile():
+    fd = pop()
+    os.close(fd)
+    push(fd >= 0)
+add_simple_operator('(open-file)', openfile)
+add_simple_operator('(close-file)', closefile)
 
 start = read(HERE_CELL)
 comma(find('k'))