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<ul><li>provide as much detail as possible</li><li>provide the information as soon as possible</li><li>dont force the library user into one style of error handling</li></ul>
call it with the error information</li><li>otherwise if there is a global callback set with <ahref="html/libvirt-virterror.html#virSetErrorFunc">virSetErrorFunc</a>,
call it with the error information</li><li>otherwise call <ahref="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>
on stderr</li><li>save the error in the connection for later retrieval with <ahref="html/libvirt-virterror.html#virConnGetLastError">virConnGetLastError</a></li></ol></li><li>otherwise like when failing to create an hypervisor connection:
on stderr</li><li>save the error in the connection for later retrieval with <ahref="html/libvirt-virterror.html#virGetLastError">virGetLastError</a></li></ol></li></ol>
<ul><li>code: an error number from the <ahref="html/libvirt-virterror.html#virErrorNumber">virErrorNumber</a>
enum</li><li>domain: an enum indicating which part of libvirt raised the error see
<ahref="html/libvirt-virterror.html#virErrorDomain">virErrorDomain</a></li><li>level: the error level, usually VIR_ERR_ERROR, though there is room for
warnings like VIR_ERR_WARNING</li><li>message: the full human-readable formatted string of the error</li><li>conn: if available a pointer to the <ahref="html/libvirt-libvirt.html#virConnectPtr">virConnectPtr</a>
connection to the hypervisor where this happened</li><li>dom: if available a pointer to the <ahref="html/libvirt-libvirt.html#virDomainPtr">virDomainPtr</a> domain
libvirt print the error on stderr by calling <ahref="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>.
For asynchronous error handing, set such a function doing nothing to avoid
the error being reported on stderr, and call virConnGetLastError or
virGetLastError when an API call returned an error value. It can be a good
idea to use <ahref="html/libvirt-virterror.html#virResetLastError">virResetError</a> or <ahref="html/libvirt-virterror.html#virConnResetLastError">virConnResetLastError</a>
