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/* nbdkit
* 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.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include "internal.h"
/* Copy the error message to threadlocal. This is sent to callers
* which are using structured replies, but is for extra information
* only so don't fail if we are unable to copy it.
*/
static void
copy_error_to_threadlocal (int orig_errno, const char *fs, va_list args)
{
va_list args_copy;
char *msg;
int r;
va_copy (args_copy, args);
errno = orig_errno; /* must restore in case fs contains %m */
r = vasprintf (&msg, fs, args_copy);
va_end (args_copy);
if (r != -1 && msg)
threadlocal_set_last_error (msg); /* ownership passed to threadlocal */
}
/* Call the right log_*_verror function depending on log_to sink.
* Note: preserves the previous value of errno.
*/
void
log_verror (const char *fs, va_list args)
{
int orig_errno = errno;
copy_error_to_threadlocal (orig_errno, fs, args);
switch (log_to) {
case LOG_TO_DEFAULT:
if (forked_into_background)
log_syslog_verror (orig_errno, fs, args);
else
log_stderr_verror (orig_errno, fs, args);
break;
case LOG_TO_SYSLOG:
log_syslog_verror (orig_errno, fs, args);
break;
case LOG_TO_STDERR:
log_stderr_verror (orig_errno, fs, args);
break;
case LOG_TO_NULL:
/* nothing */
break;
}
errno = orig_errno; /* Restore errno before leaving the function. */
}
/* Note: preserves the previous value of errno. */
NBDKIT_DLL_PUBLIC void
nbdkit_verror (const char *fs, va_list args)
{
log_verror (fs, args);
}
/* Note: preserves the previous value of errno. */
NBDKIT_DLL_PUBLIC void
nbdkit_error (const char *fs, ...)
{
va_list args;
va_start (args, fs);
nbdkit_verror (fs, args);
va_end (args);
}
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