libosmocore libusb integration

Osmocom applications typically use libosmocore select.[ch] event loop
code as their main event dispatch mechanism.  When they want to deal
with libusb in a non-blocking/asynchronous way, they need to integrate
libusb into that select().

The new libosmousb is doing exactly that: Providing a shared utility
library for Osmocom programs that wish to use libusb.  This is useful
for example in simtrace2 host utilitie as well as osmo-e1d.

Change-Id: I656a1a38cbb5b1f3a9145d2869d3b4d0adefcae3
Closes: OS#4299

1 files changed, 6 insertions, 0 deletions

diff --git a/include/osmocom/usb/libusb.h b/include/osmocom/usb/libusb.h
new file mode 100644
index 00000000..7f10f74c
--- /dev/null
+++ b/include/osmocom/usb/libusb.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <libusb.h>
+
+int osmo_libusb_init(libusb_context **luctx);
+void osmo_libusb_exit(libusb_context *luctx);