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usbshm.c

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  • usbshm.c 8.25 KiB
    /* * Copyright (c) 2023 Carl Klemm <carl@uvos.xyz>
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without modification,
     * are permitted provided that the following conditions are met:
     *
     *  * Redistributions of source code must retain the above copyright notice, this
     * list of conditions and the following disclaimer.
     *  * Redistributions in binary form must reproduce the above copyright notice,
     * this list of conditions and the following disclaimer in the documentation and/or
     * other materials provided with the distribution.
     *  * Neither the name of %ORGANIZATION% nor the names of its contributors may be
     * used to endorse or promote products derived from this software without specific
     * prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
     * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include "usbshm.h"
    
    #include <stdio.h>
    #include <stdatomic.h>
    #include <stdbool.h>
    #include <string.h>
    #include <stdlib.h>
    #include <libusb-1.0/libusb.h>
    #include <errno.h>
    #include <unistd.h>
    
    struct usbshm_priv
    {
    	libusb_device_handle* handle;
    	struct libusb_transfer* transfer;
    	unsigned char* buffer;
    };
    
    static unsigned objectCounter = 0;
    static struct timeval timeout = {1, 0};
    static pthread_mutex_t *libusbDataMutex;
    static pthread_t libusbThread;
    static atomic_bool threadStop;
    
    static void usbshm_transferCallBack(struct libusb_transfer *transfer);
    
    void usbshm_distroy(struct usbshm* instance)
    {
    	while(!usbshm_ready(instance))
    		sleep(1);
    	free(instance->priv->transfer);
    	libusb_close(instance->priv->handle);
    	free(instance->priv->buffer);
    	free(instance->productName);
    	free(instance->priv);
    	if(--objectCounter == 0)
    	{
    		threadStop = true;
    		pthread_join(libusbThread, NULL);
    		libusb_exit(NULL);
    		pthread_mutex_destroy(libusbDataMutex);
    	}