vdev_logf()

Output a formatted string containing a vdev-specific message

Synopsis:

#include <qvm/outpipe.h>

void vdev_logf(const unsigned int attr,
               const vdev_t *const vdp,
               const char *const fmt,
               ...)

Arguments:

attr: The message-level attribute.
vdp: A pointer to a structure representing the vdev requesting output.
fmt: A pointer to a printf-like formatted string.
...: Optional arguments for the string referenced by fmt.

Description:

This function outputs a string formatted in printf() style to the outpipes defined in the configuration, and indicates the specified vdev as the message source. It is intended for errors that are non-fatal and non-internal; for those other types of errors (QVM_OUTAL_FATAL or QVM_OUTAL_INTERNAL), use qvm_fatal() instead.

If a vdev uses vdev_logf(), then its logging policy may be specified through the log option for this vdev, independently of the global logger option in the configuration for the VM.