nbdkit_debug - Man Page

 #include <nbdkit-plugin.h>

 void nbdkit_debug (const char *fs, ...);
 void nbdkit_vdebug (const char *fs, va_list args);

Use nbdkit_debug or nbdkit_vdebug to print debug messages from your plugin or filter.

These functions send the debug message to either stderr or the system logs depending on the current server state and the user-specified nbdkit --log option.  Debug messages are only emitted when the server is in verbose mode (nbdkit -v option)

nbdkit_debug works like printf(3).  nbdkit_vdebug works like vprintf(3).

For convenience both these functions preserve the value of errno, and also support the glibc extension of a single %m in a format string expanding to strerror(errno), even on platforms that don't support that natively.

In nbdkit-golang-plugin(3):

 import "libguestfs.org/nbdkit"
 nbdkit.Debug(msg)

In nbdkit-ocaml-plugin(3):

 NBDKit.debug : ('a, unit, string, unit) format4 -> 'a

In nbdkit-perl-plugin(3):

 Nbdkit::debug ($msg);

In nbdkit-python-plugin(3):

 import nbdkit
 nbdkit.debug(str)

In nbdkit-rust-plugin(3):

 use nbdkit::*;
 debug!(fs, ...);

nbdkit_debug was present in nbdkit 0.1.0.

nbdkit(1), nbdkit_error(3), nbdkit-plugin(3), nbdkit-filter(3).

Richard W.M. Jones

Copyright Red Hat

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of Red Hat nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

NBDKit(3), nbdkit_error(3), nbdkit-filter(3), nbdkit-perl-plugin(3), nbdkit-plugin(3), nbdkit-release-notes-1.40(1).

The man page nbdkit_vdebug(3) is an alias of nbdkit_debug(3).