Hi, On 06/13/2013 12:10 AM, Chris Dickens wrote: > Hi, > > I'm running the latest code from the master branch > (cf8a313b2cdb6a25f00730452aab9130cac5c52b) and am in the process of > converting my application to use hotplug functionality on Linux. When my > application calls libusb_get_device_list(), it hangs forever. > > I have tracked the issue to the hotplug_poll() function. The call to > udev_monitor_receive_device() blocks forever. Even though this documentation > (http://www.freedesktop.org/software/systemd/libudev/libudev-udev-monitor.html#udev-monitor-receive-device) > specifies that it is non-blocking by default, I found this not to be the > case. As such, the loop never exits. The call to receive_device blocks until > there is actually udev activity, and it returns a non-NULL value when this > happens. This prevents the loop in hotplug_poll() from ever exiting. > > Simply setting the udev_monitor_fd to non-blocking (fcntl with O_NONBLOCK) > resolved this issue for me.
Hmm, this is likely caused by you using an older version of libudev which did not set the fd to non-blocking by default. We do want to support such older versions, so thanks for testing this, and figuring out the fix! Since I don't have an environment to test this, can you please send a tested patch fixing this? Then I'll test it does not break anything with newer versions of libudev and push it to master. Thanks & Regards, Hans ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
