On Thu, Apr 10, 2008 at 02:56:36PM +0530, ajishrao wrote:
Hi, I am little confused about these api's such as virConnCopyLastError and virCopyLastError. Please correct my understanding.
1. virConnCopyLastError expects 2 parameter connection and virErrorPtr, This is used only after getting successful connection, If i call this without connection say it is NULL, I hope it will return -1 if no what will it return?
yes, see the code ... virConnCopyLastError(virConnectPtr conn, virErrorPtr to) { if (conn == NULL) return (-1); ...
2. virCopyLastError expects on 1 parameter virErrorPtr, this can be used any time, even before getting connection, If it is No. Then when will i use virCopyLastError api?
Also some errors may happen at a place where we don't have a connection pointer handy to report them, in that case the data is still saved but in a global variable. It's not just if a connection was successful or not.
3. If virConnectOpen/virConnectOpenReadOnly fails which api should be called to know the error code?
virCopyLastError Note that you don't have to do things asynchronously like this, see http://libvirt.org/html/libvirt-virterror.html#virSetErrorFunc allowing to provide a callback called on error if no connection is available and http://libvirt.org/html/libvirt-virterror.html#virConnSetErrorFunc to set such callback in a context with a connection i have tried to detail all this in the documentation at http://libvirt.org/errors.html Daniel -- Red Hat Virtualization group http://redhat.com/virtualization/ Daniel Veillard | virtualization library http://libvirt.org/ veillard@redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/ http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/