Relax check in bench_getlogin.rb

1 files changed, 4 insertions, 1 deletions

diff --git a/bench/bench_getlogin.rb b/bench/bench_getlogin.rb
index 12233af..8cb5176 100644
--- a/bench/bench_getlogin.rb
+++ b/bench/bench_getlogin.rb
@@ -9,7 +9,10 @@ module BenchGetlogin
     ffi_lib FFI::Library::LIBC
     attach_function :getlogin, [], :string
   end
-  if Posix.getlogin != Etc.getlogin
+
+  # getlogin(2) might return NULL, in which case Etc.getlogin uses ENV["USER"].
+  # This should not matter for this benchmark, getlogin() is still called.
+  if (Posix.getlogin || ENV["USER"]) != Etc.getlogin
     raise ArgumentError, "FFI getlogin returned incorrect value: " \
       "#{Posix.getlogin.inspect} (FFI) vs #{Etc.getlogin.inspect} (Etc)"
   end