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/* NBD client library in userspace
* Copyright Red Hat
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <errno.h>
#include "internal.h"
int
nbd_unlocked_set_debug (struct nbd_handle *h, bool fl)
{
h->debug = fl;
return 0;
}
/* NB: may_set_error = false. */
int
nbd_unlocked_get_debug (struct nbd_handle *h)
{
return h->debug;
}
int
nbd_unlocked_clear_debug_callback (struct nbd_handle *h)
{
FREE_CALLBACK (h->debug_callback);
return 0;
}
int
nbd_unlocked_set_debug_callback (struct nbd_handle *h,
nbd_debug_callback *debug_callback)
{
/* This can't fail at the moment - see implementation above. */
nbd_unlocked_clear_debug_callback (h);
h->debug_callback = *debug_callback;
SET_CALLBACK_TO_NULL (*debug_callback);
return 0;
}
/* Note this preserves the value of errno, making it safe to use in
* all situations.
*/
void
nbd_internal_debug (struct nbd_handle *h, const char *context,
const char *fs, ...)
{
int err, r;
va_list args;
char *msg = NULL;
/* The debug() wrapper checks this, but check it again in case
* something calls nbd_internal_debug directly.
*/
if (!h->debug) return;
err = errno;
if (context == NULL)
context = nbd_internal_get_error_context ();
va_start (args, fs);
r = vasprintf (&msg, fs, args);
va_end (args);
if (r == -1)
goto out;
if (CALLBACK_IS_NOT_NULL (h->debug_callback))
/* ignore return value */
CALL_CALLBACK (h->debug_callback, context, msg);
else
fprintf (stderr, "libnbd: debug: %s: %s: %s\n",
h->hname, context ? : "unknown", msg);
out:
free (msg);
errno = err;
return;
}
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