1 files changed, 14 insertions, 0 deletions
diff --git a/sysif.c b/sysif.c
index 7b072072..dd5f2409 100644
--- a/sysif.c
+++ b/sysif.c
@@ -668,6 +668,16 @@ val statf(val stream)
   return stat_impl(stream, w_fstat, lit("fstat"));
 }
 
+#if HAVE_SYS_STAT
+
+static val umask_wrap(val mask)
+{
+  (void) umask(c_num(mask));
+  return t;
+}
+
+#endif
+
 #if HAVE_PIPE
 
 static val pipe_wrap(void)
@@ -1475,4 +1485,8 @@ void sysif_init(void)
 #if HAVE_POLL
   reg_fun(intern(lit("poll"), user_package), func_n2o(poll_wrap, 1));
 #endif
+
+#if HAVE_SYS_STAT
+  reg_fun(intern(lit("umask"), user_package), func_n1(umask_wrap));
+#endif
 }