lsusb.c provided from libusb-1.0 source

Makefile

@@ -0,0 +1,6 @@
+LD=-lusb-1.0
+CC=gcc
+CFLAGS=-Os
+
+lsusb: lsusb.c
+	$(CC) lsusb.c -o lsusb $(CFLAGS) $(LD)

lsusb.c

@@ -0,0 +1,64 @@
+/*
+ * libusb example program to list devices on the bus
+ * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+
+#include <libusb-1.0/libusb.h>
+
+static void print_devs(libusb_device **devs)
+{
+	libusb_device *dev;
+	int i = 0;
+
+	while ((dev = devs[i++]) != NULL) {
+		struct libusb_device_descriptor desc;
+		int r = libusb_get_device_descriptor(dev, &desc);
+		if (r < 0) {
+			fprintf(stderr, "failed to get device descriptor");
+			return;
+		}
+
+		printf("%04x:%04x (bus %d, device %d)\n",
+			desc.idVendor, desc.idProduct,
+			libusb_get_bus_number(dev), libusb_get_device_address(dev));
+	}
+}
+
+int main(void)
+{
+	libusb_device **devs;
+	int r;
+	ssize_t cnt;
+
+	r = libusb_init(NULL);
+	if (r < 0)
+		return r;
+
+	cnt = libusb_get_device_list(NULL, &devs);
+	if (cnt < 0)
+		return (int) cnt;
+
+	print_devs(devs);
+	libusb_free_device_list(devs, 1);
+
+	libusb_exit(NULL);
+	return 0;
+}
+