Actually implement the right transformation!

diff --git a/fdflags.c b/fdflags.c
index 6f401e4..6e0cb0e 100644 (file)
--- a/fdflags.c
+++ b/fdflags.c
@@ -59,14 +59,14 @@ int fdflags(int fd, unsigned fbic, unsigned fxor,
   if (fbic || fxor) {
     if ((f = fcntl(fd, F_GETFL)) == -1)
       return (-1);
-    ff = (f & fbic) ^ fxor;
+    ff = (f & ~fbic) ^ fxor;
     if (f != ff && fcntl(fd, F_SETFL, ff) == -1)
       return (-1);
   }
   if (fdbic || fdxor) {
     if ((f = fcntl(fd, F_GETFD)) == -1)
       return (-1);
-    ff = (f & fdbic) ^ fdxor;
+    ff = (f & ~fdbic) ^ fdxor;
     if (f != ff && fcntl(fd, F_SETFD, ff) == -1)
       return (-1);
   }