[Libusb-devel] Linux-RH7.3 Leak?

[Jacob Z. <ja...@ya...>]

Hi,
I've been using libusb-0.1.12 (Linux RedHat 7.3) to
read mouse movement. The following test code can read
the movement but the system keeps losing memory until
it runs out of memory & reboots. 
The 'top' program shows that my user program 'usbtest'
does not grow in memory; but the System memory used,
grows in size & the system memory free decreases
rapidly.
 
Any explanation as to why the system's losing memory?
Am i missing some type of release() memory call here?
The same symptoms occured when using the default
libusb that shipped with RH 7.3 & libusb-0.1.12.

Any tips would be much appreciated.


// Compiled with
//g++ usbtest.c  -I/usb/libusb-0.1.12 
-L/usb/libusb-0.1.12/.libs -lusb -lusbpp -o usbtest

#include <stdio.h>
#include <string.h>
#include <usb.h>
#include <assert.h>

usb_dev_handle *locate_xsv(void);
#define SZ 512 

int main (int argc,char **argv)
{
	struct usb_dev_handle *xsv_handle;
	struct usb_device *xsv_device;
	int open_status;
	int curX=0, curY=0, curZ=0, lastX, lastY, lastZ;
	char buf[SZ]="";

	memset(buf,0, SZ );

	usb_init();
	usb_set_debug(2);
 	if ((xsv_handle = locate_xsv())==0) 
	{
		printf("Could not open the XSV device\n");
		return (-1);
	}  

	open_status = usb_set_configuration(xsv_handle,1);
	printf("conf_stat=%d\n",open_status);
	
	open_status = usb_claim_interface(xsv_handle,0);
	printf("claim_stat=%d\n",open_status);
	
	open_status = usb_set_altinterface(xsv_handle,0);
	printf("alt_stat=%d\n",open_status);

	int bytes=0;
	unsigned char ch, byte1=0, byte2;
	bool Xmov, Ymov,Zmov;
	unsigned int state =0, evttype=0;

	while(1)
	{
		bytes = usb_bulk_read(xsv_handle, 0x81 ,buf,8,5);
//mouse
	//	bytes = usb_interrupt_read(xsv_handle, 0x81
,buf,8,500);	//mouse
		//assert(0);
		// byte 2 : >0 == DOWN, <0 ==UP
		// byte 1 : >0 == RIGHT, <0 ==LEFT
		if(bytes >0)
		{
		/*printf("bytes(%d)\n",bytes);
		for(int i=0;i<25;i++)
		{
			ch = buf[i];
			printf(" %x ", ch);
		}
		printf("\n");*/
		if (buf[2]>0) {
			printf("qDOWN\n");
		}else if (buf[2]<0) {
			printf("qUP\n");
		}
		if (buf[1]>0) {
			printf("qRIGHT\n");
		}else if (buf[1]<0) {
			printf("qqqqqLEFT\n");
		}
		}
	}

}	

usb_dev_handle *locate_xsv(void) 
{
	unsigned char located = 0;
	struct usb_bus *bus;
	struct usb_device *dev;
	usb_dev_handle *device_handle = 0;
 		
	usb_find_busses();
	usb_find_devices();
 
 	for (bus = usb_busses; bus; bus = bus->next)
	{
		for (dev = bus->devices; dev; dev = dev->next)	
		{
			if (dev->descriptor.idVendor == 0x09da /*mouse*/) 
//  		if (dev->descriptor.idVendor == 0x04e7 /*elo*/) 
			{	
				located++;
				device_handle = usb_open(dev);
				printf(" Device Found @ Address %s \n",
dev->filename);
				printf(" Vendor ID
0x0%x\n",dev->descriptor.idVendor);
				printf(" Product ID
0x0%x\n",dev->descriptor.idProduct);
			}
			else printf("** usb device %s found **\n",
dev->filename);			
		}	
  }

  if (device_handle==0) return (0);
  else return (device_handle);  	
}


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