plugins/golang/src/libguestfs.org/nbdkit/utils.go

   1 /* cgo wrappers.
   2  * Copyright Red Hat
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 package nbdkit
  34
  35 /*
  36 #cgo pkg-config: nbdkit
  37
  38 #define NBDKIT_API_VERSION 2
  39 #include <nbdkit-plugin.h>
  40
  41 // cgo cannot call varargs functions.
  42 void
  43 _nbdkit_debug (const char *s)
  44 {
  45   nbdkit_debug ("%s", s);
  46 }
  47
  48 // cgo cannot call varargs functions.
  49 void
  50 _nbdkit_error (const char *s)
  51 {
  52   nbdkit_error ("%s", s);
  53 }
  54 */
  55 import "C"
  56 import "syscall"
  57
  58 // Utility functions.
  59
  60 func Debug(s string) {
  61         C._nbdkit_debug(C.CString(s))
  62 }
  63
  64 // This function is provided but plugins would rarely need to call
  65 // this explicitly since returning an error from a plugin callback
  66 // will call it implicitly.
  67 func Error(s string) {
  68         C._nbdkit_error(C.CString(s))
  69 }
  70
  71 // Same applies as for Error().  Callers should not usually need to
  72 // call this.
  73 func SetError(err syscall.Errno) {
  74         C.nbdkit_set_error(C.int(err))
  75 }