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.\"
.\" Copyright (c) 2025 Rick Parrish <unitrunker@unitrunker.net>
.\"
.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.Dd December 14, 2025
.Dt LIBUSB20 3
.Os
.Sh NAME
.Nm libusb20_be_device_foreach
.Nd iterate connected USB devices
.Sh SYNOPSIS
.Lb libusb
.In libusb20.h
.Ft struct libusb20_device *
.Fn libusb20_be_device_foreach "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
.Sh DESCRIPTION
The
.Nm
function iterates connected USB devices, one device at a time.
A backend pointer for
.Fa pbe
may be obtained by calling
.Xr libusb20_be_alloc_default 3 .
The starting value of
.Fa pdev
is NULL.
Calling
.Nm libusb20_be_device_foreach
again with
.Fa pdev
set to the return value of the previous call yields the next device.
To begin interacting with a USB device, pass the pointer in a call to
.Xr libusb20_dev_open 3 .
.Sh RETURN VALUES
.Nm
returns NULL for end of list.
Otherwise this is a pointer to the next device.
.Sh EXAMPLES
.Bd -literal
#include <libusb20.h>
struct libusb20_backend *be = libusb20_be_alloc_default();
struct libusb20_device *device = NULL;
while ( (device = libusb20_be_device_foreach(be, device)) != NULL ) {
if (libusb20_dev_open(device, 0) == LIBUSB20_SUCCESS) {
/* do something */
libusb20_dev_close(device);
}
}
libusb20_be_free(be);
.Ed
.Sh SEE ALSO
.Xr libusb20 3 ,
.Xr libusb20_be_alloc_default 3 ,
.Xr libusb20_be_free 3 ,
.Xr libusb20_dev_open 3
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