1 files changed, 31 insertions, 0 deletions
diff --git a/portmidi/pm_linux/pmlinuxnull.c b/portmidi/pm_linux/pmlinuxnull.c
new file mode 100644
index 0000000..257f3d6
--- /dev/null
+++ b/portmidi/pm_linux/pmlinuxnull.c
@@ -0,0 +1,31 @@
+/*
+ * pmlinuxnull.c -- system specific definitions
+ * 
+ * written by:
+ *  Roger Dannenberg
+ * 
+ * If there is no ALSA, you can define PMNULL and build PortMidi. It will
+ * not report any devices, so you will not be able to open any, but if
+ * you wanted to disable MIDI from some application, this could be used.
+ *    Mainly, this code shows the possibility of supporting multiple
+ * interfaces, e.g., ALSA and Sndio on BSD, or ALSA and Jack on Linux.
+ * But as of Dec, 2021, the only supported MIDI API for Linux is ALSA.
+ */
+
+#ifdef PMNULL
+
+#include "portmidi.h"
+#include "pmlinuxnull.h"
+
+
+PmError pm_linuxnull_init(void)
+{
+    return pmNoError;
+}
+
+
+void pm_linuxnull_term(void)
+{
+}
+
+#endif