Hi, The libvirt documentation under http://libvirt.org/html/libvirt-libvirt.html#virSchedParameter fails to list the "value" member, even though that is kind of essential for using the struct. This is what the documentation says: struct virSchedParameter{ charfield[VIR_DOMAIN_SCHED_FIELD_LENGTH] field : parameter name int type : parameter type } This is how it looks in the actual header file: typedef struct _virSchedParameter virSchedParameter; struct _virSchedParameter { char field[VIR_DOMAIN_SCHED_FIELD_LENGTH]; /* parameter name */ int type; /* parameter type */ union { int i; /* data for integer case */ unsigned int ui; /* data for unsigned integer case */ long long int l; /* data for long long integer case */ unsigned long long int ul; /* data for unsigned long long integer case */ double d; /* data for double case */ char b; /* data for char case */ } value; /* parameter value */ }; This one had me scratching my head for a while, because the way it is documented, it's absolutely not clear how the struct is supposed to be used. Only after studying the virsh source code for a while did I notice that this struct apparently has more members than the documentation lets on... Guido