Date: Fri, 12 Dec 2025 13:05:45 +0000 From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 291506] libusb_open advisory lock (libusb compatiblity) Message-ID: <bug-291506-19105-NLZLDINVDF@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-291506-19105@https.bugs.freebsd.org/bugzilla/> References: <bug-291506-19105@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291506 --- Comment #4 from unitrunker <unitrunker@unitrunker.net> --- The usbgrab tool can be used to illustrate the problem. Invoking 'usbgrab <vid> <pid>' will return after opening one device. Assuming only one such device is attached, adding the "-a" to grab all such devices returns with 32 devices. There is a hard limit on a maximum of 32 devices before usbgrab stops. There is in fact only one such device but libusb_open_with_vid_pid returns the same device 32 times. libusb client software depends upon: a. libusb_open returning an error for a device already in use. b. libusb_open_with_vid_pid NOT returning a device already in use. -- You are receiving this mail because: You are the assignee for the bug.
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