On Tue, Apr 23, 2019 at 10:42:17AM +0100, Daniel P. Berrangé wrote: > On Tue, Apr 23, 2019 at 11:12:40AM +0800, Jie Wang wrote: > > Does qemu-pr-helper have its own log files？ > > When QEMU launches it, i think it just inherits stdout/err from > QEMU itself, so errors appear mixed into QEMU's stdout output.
I thought QEMU does not launch qemu-pr-helper. Have I missed something? QEMU ships systemd .service and .socket files for managing qemu-pr-helper externally. > When libvirt launches it, there stdout is connected to /dev/null > and stderr is connected to a pipe which libvirt closes almost > immediately. This means any errors are lost as any attempt to > write to stderr will get EPIPE :-( For anyone looking at the code: src/qemu/qemu_process.c:qemuProcessStartManagedPRDaemon() Stefan
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