Don't refer to SIGWINCH, SIGIO if they don't exist

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@2010 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/libsystem.c b/lib/libsystem.c
index b8c3ea50..d6c69c2b 100644
--- a/lib/libsystem.c
+++ b/lib/libsystem.c
@@ -273,10 +273,20 @@ signalName(unsigned int const signalClass) {
         return "SIGVTALRM";
     case SIGPROF:
         return "SIGPROF";
+/* Most systems have SIGWINCH and SIGIO, but at least OpenBSD, in 2013,
+   does not.  Systems that do don't necessarily supply it as a macro, so
+   the following tests are not perfect, but a false negative is a really,
+   really, small problem, so we don't bother with all the work it would
+   take to do better.
+*/
+#ifdef SIGWINCH
     case SIGWINCH:
         return "SIGWINCH";
+#endif
+#ifdef HAVE_SIGIO
     case SIGIO:
         return "SIGIO";
+#endif
     case SIGSYS:
         return "SIGSYS";
     default: