Attachment 225579 Details for Bug 256296 – Better bug reproducer

Better bug reproducer

libusbhasbug.c (text/plain), 1.37 KB, created by Sergii on 2021-06-05 22:30:37 UTC

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Creator: Sergii

Created: 2021-06-05 22:30:37 UTC

Size: 1.37 KB

patch

obsolete

>#include <stdio.h>
>#include <libusb.h>
>#include <pthread.h>
>#include <unistd.h>
>
>static void *
>thread_start(void *arg)
>{
>	struct timeval tv = { .tv_usec = 0, .tv_sec = 2 };
>	while (1)
>		libusb_handle_events_timeout_completed (arg, &tv, NULL);
>	return NULL;
>}
>
>int main () {
>	libusb_context *ctx;
>	libusb_init (&ctx);
>
>	pthread_t thread_id;
>	pthread_create (&thread_id, NULL, &thread_start, ctx);
>
>	libusb_device **devs;
>	ssize_t dev_num = libusb_get_device_list (ctx, &devs); 
>	
>	printf ("dev count = %zd\n", dev_num);
>	if (dev_num == 0) return 1;
>
>	// --- open first time to break the device object
>	
>	libusb_device_handle *devh;
>	int code = libusb_open (devs[0], &devh);
>	printf ("open() = %d\n", code);
>	if (code != 0) return 1;
>
>	// let the other thread stop in poll()
>	sleep(1);
>
>	// close the device (replace its methods with stubs)
>	libusb_close (devh); 
>
>	// let the other thread mark device as gone
>	sleep(2);
>
>	// --- open second time to show that device can't be used
>	
>	code = libusb_open (devs[0], &devh);
>	printf ("open() = %d\n", code);
>	if (code != 0) return 1;
>
>	// doesn't matter what we try to transfer, device is unusable
>	int transferred = 0;
>	unsigned char buf[1] = {};
>	printf ("interrupt_transfer() = %d\n",
>			libusb_interrupt_transfer (devh, 0x00, buf, sizeof(buf), &transferred, 5000)); 
>	printf ("transferred = %d\n", transferred);
>
>	libusb_close (devh); 
>
>	return 0;
>}

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Attachments on bug 256296: 225431 | 225579 | 225640