78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
|
/*
|
||
|
|
* Driver API definitions
|
||
|
|
* Copyright (C) 2018 Bastien Nocera <hadess@hadess.net>
|
||
|
|
*
|
||
|
|
* 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 "fpi-usb.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* SECTION:fpi-usb
|
||
|
|
* @title: Helpers for libusb
|
||
|
|
*
|
||
|
|
* A collection of [libusb helpers](http://libusb.sourceforge.net/api-1.0/group__poll.html#details)
|
||
|
|
* to make driver development easier. Please refer to the libusb API documentation for more
|
||
|
|
* information about the original API.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Helpers from glib */
|
||
|
|
#include <glib.h>
|
||
|
|
#include <glib/gprintf.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
/* special helpers to avoid gmessage.c dependency */
|
||
|
|
static void mem_error (const char *format, ...) G_GNUC_PRINTF (1,2);
|
||
|
|
#define mem_assert(cond) do { if (G_LIKELY (cond)) ; else mem_error ("assertion failed: %s", #cond); } while (0)
|
||
|
|
|
||
|
|
static void
|
||
|
|
mem_error (const char *format,
|
||
|
|
...)
|
||
|
|
{
|
||
|
|
const char *pname;
|
||
|
|
va_list args;
|
||
|
|
/* at least, put out "MEMORY-ERROR", in case we segfault during the rest of the function */
|
||
|
|
fputs ("\n***MEMORY-ERROR***: ", stderr);
|
||
|
|
pname = g_get_prgname();
|
||
|
|
g_fprintf (stderr, "%s[%ld]: ", pname ? pname : "", (long)getpid());
|
||
|
|
va_start (args, format);
|
||
|
|
g_vfprintf (stderr, format, args);
|
||
|
|
va_end (args);
|
||
|
|
fputs ("\n", stderr);
|
||
|
|
abort();
|
||
|
|
_exit (1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* fpi_usb_alloc:
|
||
|
|
*
|
||
|
|
* Returns a struct libusb_transfer, similar to calling
|
||
|
|
* `libusb_alloc_transfer(0)`[[1](http://libusb.sourceforge.net/api-1.0/group__asyncio.html#ga13cc69ea40c702181c430c950121c000)]. As libfprint uses GLib internally,
|
||
|
|
* and [memory allocation failures will make applications fail](https://developer.gnome.org/glib/stable/glib-Memory-Allocation.html#glib-Memory-Allocation.description),
|
||
|
|
* this helper will assert when the libusb call fails.
|
||
|
|
*/
|
||
|
|
struct libusb_transfer *
|
||
|
|
fpi_usb_alloc(void)
|
||
|
|
{
|
||
|
|
struct libusb_transfer *transfer;
|
||
|
|
|
||
|
|
transfer = libusb_alloc_transfer(0);
|
||
|
|
mem_assert(transfer);
|
||
|
|
|
||
|
|
return transfer;
|
||
|
|
}
|