[libvirt] [RFC] virCommandRun return error number

Hi all, I copy portions of libvirt/src/storage/storage_backend_sheepdog.c [...] 125 ret = virCommandRun(cmd, NULL); 126 if (ret == 0) 127 ret = virStorageBackendSheepdogParseNodeInfo(pool->def, output); [...] I found virCommandRun may return '-1', which hinds something error happens. However, Sheepdog hasn't check here. Maybe i have come up with this bug. I cannot remember clearly. Could anyone please give me some suggestions? If ture, i will give a patch for this bug ;-). -- Thanks Harry Wei