On 05/24/2017 10:16 AM, Simon wrote: > Hello, > > It seems that the monitor file path length is limited to about 100 > characters (107 to be precise).
Welcome to the joy of Unix socket (AF_UNIX) files. The kernel imposes a hard length limit on sockaddr_un.sun_path[] (see 'man 7 unix') - and it is indeed 107 characters plus a NUL terminator. > -monitor > 'unix:/home/user/vmtools/test/out/foobar.iso/foobar.iso_A/foobar.iso_B/foobar.iso_C/foobar.iso_D/foobar.iso_E/monitor.sock,server,nowait' > > > With this command Qemu does not produce any warning or error message but > create the socket file "mon" instead of the expected "monitor.sock". Ideally, qemu should be telling you your path is too long to be created as a unix socket, and failing up front, rather than silently truncating and perhaps doing the wrong thing. > Is there a clean way to work around this limitation? Don't use longer path names than the kernel supports. > > As a side-note, is there any technical reason for such a limitation? Yes, but you'll have to ask kernel folks for the reason. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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