don't print messages by default

Add libusb_set_debug() API to set message verbosity.

Ludovic Rousseau pointed out that applications may close stdout/stderr
descriptors, which might then be reused.

1 files changed, 1 insertions, 0 deletions

diff --git a/libusb/libusb.h b/libusb/libusb.h
index 3e77beb..3d222e3 100644
--- a/libusb/libusb.h
+++ b/libusb/libusb.h
@@ -723,6 +723,7 @@ struct libusb_transfer {
 
 int libusb_init(void);
 void libusb_exit(void);
+void libusb_set_debug(int level);
 
 ssize_t libusb_get_device_list(libusb_device ***list);
 void libusb_free_device_list(libusb_device **list, int unref_devices);