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Hi, When using « virsh attach-device ....." to add a channel device to a Guest , I see following entry in libvirt log : 2015-12-07 11:14:47.307+0000: 14551: debug : virDomainAttachDeviceFlags:10433 : dom=0x7f2a58252fc0, ........ Great !! But , when calling virDomainAttachDeviceFlags( ) from a C program , I got return code -1 but nothing appears related to virDomainAttachDeviceFlags(

...looks like the client has not even gotten into RPC call. This means that you are passing a wrong argument somewhere. You can: 1) check here what arguments are being checked for: http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/libvirt-domain.c;h=b91388e77e00bf30674f3e25fbdfd38b8626c351;hb=HEAD#l8301 2) Use virGetLastError() to check the actual error. Michal